diff --git a/cranelift/codegen/src/isa/x64/inst.isle b/cranelift/codegen/src/isa/x64/inst.isle
index b74b9c38c0..1fdc6b25c0 100644
--- a/cranelift/codegen/src/isa/x64/inst.isle
+++ b/cranelift/codegen/src/isa/x64/inst.isle
@@ -320,6 +320,21 @@
                        (dst WritableGpr)
                        (imm u8))
 
+       ;; XMM (scalar) unary op (from integer to float reg): vmovd, vmovq,
+       ;; vcvtsi2s{s,d}
+       (GprToXmmVex (op AvxOpcode)
+                    (src GprMem)
+                    (dst WritableXmm)
+                    (src_size OperandSize))
+
+       ;; XMM (scalar) unary op (from xmm to integer reg): vmovd, vmovq,
+       ;; vcvtts{s,d}2si
+       (XmmToGprVex (op AvxOpcode)
+                    (src Xmm)
+                    (dst WritableGpr)
+                    (dst_size OperandSize))
+
+
        ;; XMM (scalar or vector) binary op that relies on the EVEX
        ;; prefix. Takes two inputs.
        (XmmRmREvex (op Avx512Opcode)
@@ -1277,6 +1292,13 @@
             Vpbroadcastw
             Vpbroadcastd
             Vbroadcastss
+            Vmovd
+            Vmovq
+            Vmovmskps
+            Vmovmskpd
+            Vpmovmskb
+            Vcvtsi2ss
+            Vcvtsi2sd
           ))
 
 (type Avx512Opcode extern
@@ -1539,6 +1561,10 @@
 (decl lo_gpr (Value) Gpr)
 (rule (lo_gpr regs) (gpr_new (lo_reg regs)))
 
+;; Construct a new `XmmMemImm` from a 32-bit immediate.
+(decl xmi_imm (u32) XmmMemImm)
+(extern constructor xmi_imm xmi_imm)
+
 ;;;; Helpers for Working With Integer Comparison Codes ;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
 
@@ -1818,10 +1844,7 @@
 (decl mov_rmi_to_xmm (RegMemImm) XmmMemImm)
 (rule (mov_rmi_to_xmm rmi @ (RegMemImm.Mem _)) (xmm_mem_imm_new rmi))
 (rule (mov_rmi_to_xmm rmi @ (RegMemImm.Imm _)) (xmm_mem_imm_new rmi))
-(rule (mov_rmi_to_xmm (RegMemImm.Reg r))
-      (gpr_to_xmm (SseOpcode.Movd)
-                  r
-                  (OperandSize.Size32)))
+(rule (mov_rmi_to_xmm (RegMemImm.Reg r)) (x64_movd_to_xmm r))
 
 ;;;; Helpers for Emitting Calls ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
@@ -1941,9 +1964,37 @@
         (if-let $true (use_avx_simd))
         (xmm_movrm_vex (AvxOpcode.Vmovupd) addr data))
 
-(decl x64_movd (Xmm) Gpr)
-(rule (x64_movd from)
+;; Helper for creating `movd` instructions.
+(decl x64_movd_to_gpr (Xmm) Gpr)
+(rule (x64_movd_to_gpr from)
       (xmm_to_gpr (SseOpcode.Movd) from (OperandSize.Size32)))
+(rule 1 (x64_movd_to_gpr from)
+        (if-let $true (use_avx_simd))
+        (xmm_to_gpr_vex (AvxOpcode.Vmovd) from (OperandSize.Size32)))
+
+;; Helper for creating `movd` instructions.
+(decl x64_movd_to_xmm (GprMem) Xmm)
+(rule (x64_movd_to_xmm from)
+      (gpr_to_xmm (SseOpcode.Movd) from (OperandSize.Size32)))
+(rule 1 (x64_movd_to_xmm from)
+        (if-let $true (use_avx_simd))
+        (gpr_to_xmm_vex (AvxOpcode.Vmovd) from (OperandSize.Size32)))
+
+;; Helper for creating `movq` instructions.
+(decl x64_movq_to_xmm (GprMem) Xmm)
+(rule (x64_movq_to_xmm src)
+      (gpr_to_xmm (SseOpcode.Movq) src (OperandSize.Size64)))
+(rule 1 (x64_movq_to_xmm from)
+        (if-let $true (use_avx_simd))
+        (gpr_to_xmm_vex (AvxOpcode.Vmovq) from (OperandSize.Size64)))
+
+;; Helper for creating `movq` instructions.
+(decl x64_movq_to_gpr (Xmm) Gpr)
+(rule (x64_movq_to_gpr src)
+      (xmm_to_gpr (SseOpcode.Movq) src (OperandSize.Size64)))
+(rule 1 (x64_movq_to_gpr from)
+        (if-let $true (use_avx_simd))
+        (xmm_to_gpr_vex (AvxOpcode.Vmovq) from (OperandSize.Size64)))
 
 (decl x64_movdqu_load (XmmMem) Xmm)
 (rule (x64_movdqu_load from)
@@ -2186,15 +2237,11 @@
 
 ;; `f32` immediates.
 (rule 2 (imm $F32 (u64_nonzero bits))
-      (gpr_to_xmm (SseOpcode.Movd)
-                  (imm $I32 bits)
-                  (OperandSize.Size32)))
+        (x64_movd_to_xmm (imm $I32 bits)))
 
 ;; `f64` immediates.
 (rule 2 (imm $F64 (u64_nonzero bits))
-      (gpr_to_xmm (SseOpcode.Movq)
-                  (imm $I64 bits)
-                  (OperandSize.Size64)))
+        (x64_movq_to_xmm (imm $I64 bits)))
 
 ;; Special case for when a 64-bit immediate fits into 32-bits. We can use a
 ;; 32-bit move that zero-extends the value, which has a smaller encoding.
@@ -3663,20 +3710,44 @@
             (_ Unit (emit (MInst.XmmToGprImmVex op src dst imm))))
         dst))
 
+;; Helper for creating `MInst.XmmToGprVex` instructions.
+(decl xmm_to_gpr_vex (AvxOpcode Xmm OperandSize) Gpr)
+(rule (xmm_to_gpr_vex op src size)
+      (let ((dst WritableGpr (temp_writable_gpr))
+            (_ Unit (emit (MInst.XmmToGprVex op src dst size))))
+        dst))
+
+;; Helper for creating `MInst.GprToXmmVex` instructions.
+(decl gpr_to_xmm_vex (AvxOpcode GprMem OperandSize) Xmm)
+(rule (gpr_to_xmm_vex op src size)
+      (let ((dst WritableXmm (temp_writable_xmm))
+            (_ Unit (emit (MInst.GprToXmmVex op src dst size))))
+        dst))
+
+
 ;; Helper for creating `pmovmskb` instructions.
 (decl x64_pmovmskb (OperandSize Xmm) Gpr)
 (rule (x64_pmovmskb size src)
       (xmm_to_gpr (SseOpcode.Pmovmskb) src size))
+(rule 1 (x64_pmovmskb size src)
+        (if-let $true (use_avx_simd))
+        (xmm_to_gpr_vex (AvxOpcode.Vpmovmskb) src size))
 
 ;; Helper for creating `movmskps` instructions.
 (decl x64_movmskps (OperandSize Xmm) Gpr)
 (rule (x64_movmskps size src)
       (xmm_to_gpr (SseOpcode.Movmskps) src size))
+(rule 1 (x64_movmskps size src)
+        (if-let $true (use_avx_simd))
+        (xmm_to_gpr_vex (AvxOpcode.Vmovmskps) src size))
 
 ;; Helper for creating `movmskpd` instructions.
 (decl x64_movmskpd (OperandSize Xmm) Gpr)
 (rule (x64_movmskpd size src)
       (xmm_to_gpr (SseOpcode.Movmskpd) src size))
+(rule 1 (x64_movmskpd size src)
+        (if-let $true (use_avx_simd))
+        (xmm_to_gpr_vex (AvxOpcode.Vmovmskpd) src size))
 
 ;; Helper for creating `MInst.GprToXmm` instructions.
 (decl gpr_to_xmm (SseOpcode GprMem OperandSize) Xmm)
@@ -3973,11 +4044,17 @@
 (decl x64_cvtsi2ss (Type GprMem) Xmm)
 (rule (x64_cvtsi2ss ty x)
       (gpr_to_xmm (SseOpcode.Cvtsi2ss) x (raw_operand_size_of_type ty)))
+(rule 1 (x64_cvtsi2ss ty x)
+        (if-let $true (use_avx_simd))
+        (gpr_to_xmm_vex (AvxOpcode.Vcvtsi2ss) x (raw_operand_size_of_type ty)))
 
 ;; Helper for creating `cvtsi2sd` instructions.
 (decl x64_cvtsi2sd (Type GprMem) Xmm)
 (rule (x64_cvtsi2sd ty x)
       (gpr_to_xmm (SseOpcode.Cvtsi2sd) x (raw_operand_size_of_type ty)))
+(rule 1 (x64_cvtsi2sd ty x)
+        (if-let $true (use_avx_simd))
+        (gpr_to_xmm_vex (AvxOpcode.Vcvtsi2sd) x (raw_operand_size_of_type ty)))
 
 ;; Helper for creating `cvttps2dq` instructions.
 (decl x64_cvttps2dq (XmmMem) Xmm)
@@ -4486,15 +4563,15 @@
 
 (decl bitcast_xmm_to_gpr (Type Xmm) Gpr)
 (rule (bitcast_xmm_to_gpr $F32 src)
-      (xmm_to_gpr (SseOpcode.Movd) src (OperandSize.Size32)))
+      (x64_movd_to_gpr src))
 (rule (bitcast_xmm_to_gpr $F64 src)
-      (xmm_to_gpr (SseOpcode.Movq) src (OperandSize.Size64)))
+      (x64_movq_to_gpr src))
 
 (decl bitcast_gpr_to_xmm (Type Gpr) Xmm)
 (rule (bitcast_gpr_to_xmm $I32 src)
-      (gpr_to_xmm (SseOpcode.Movd) src (OperandSize.Size32)))
+      (x64_movd_to_xmm src))
 (rule (bitcast_gpr_to_xmm $I64 src)
-      (gpr_to_xmm (SseOpcode.Movq) src (OperandSize.Size64)))
+      (x64_movq_to_xmm src))
 
 ;;;; Stack Addresses ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
@@ -4678,7 +4755,6 @@
 (convert Reg XmmMem reg_to_xmm_mem)
 (convert Reg RegMemImm reg_to_reg_mem_imm)
 (convert RegMem XmmMem reg_mem_to_xmm_mem)
-(convert RegMemImm XmmMemImm mov_rmi_to_xmm)
 (convert Xmm XmmMem xmm_to_xmm_mem)
 (convert Xmm XmmMemImm xmm_to_xmm_mem_imm)
 (convert Xmm XmmMemAligned xmm_to_xmm_mem_aligned)
diff --git a/cranelift/codegen/src/isa/x64/inst/args.rs b/cranelift/codegen/src/isa/x64/inst/args.rs
index d7a851e66d..a135fc5af1 100644
--- a/cranelift/codegen/src/isa/x64/inst/args.rs
+++ b/cranelift/codegen/src/isa/x64/inst/args.rs
@@ -1715,7 +1715,14 @@ impl AvxOpcode {
             | AvxOpcode::Vpextrq
             | AvxOpcode::Vpblendw
             | AvxOpcode::Vmovddup
-            | AvxOpcode::Vbroadcastss => {
+            | AvxOpcode::Vbroadcastss
+            | AvxOpcode::Vmovd
+            | AvxOpcode::Vmovq
+            | AvxOpcode::Vmovmskps
+            | AvxOpcode::Vmovmskpd
+            | AvxOpcode::Vpmovmskb
+            | AvxOpcode::Vcvtsi2ss
+            | AvxOpcode::Vcvtsi2sd => {
                 smallvec![InstructionSet::AVX]
             }
 
diff --git a/cranelift/codegen/src/isa/x64/inst/emit.rs b/cranelift/codegen/src/isa/x64/inst/emit.rs
index 6c1dfc9fea..2b0f3af084 100644
--- a/cranelift/codegen/src/isa/x64/inst/emit.rs
+++ b/cranelift/codegen/src/isa/x64/inst/emit.rs
@@ -2515,6 +2515,89 @@ pub(crate) fn emit(
                 .encode(sink);
         }
 
+        Inst::XmmToGprVex {
+            op,
+            src,
+            dst,
+            dst_size,
+        } => {
+            let src = allocs.next(src.to_reg());
+            let dst = allocs.next(dst.to_reg().to_reg());
+
+            let (prefix, map, opcode) = match op {
+                // vmovd/vmovq are differentiated by `w`
+                AvxOpcode::Vmovd | AvxOpcode::Vmovq => (LegacyPrefixes::_66, OpcodeMap::_0F, 0x7E),
+                AvxOpcode::Vmovmskps => (LegacyPrefixes::None, OpcodeMap::_0F, 0x50),
+                AvxOpcode::Vmovmskpd => (LegacyPrefixes::_66, OpcodeMap::_0F, 0x50),
+                AvxOpcode::Vpmovmskb => (LegacyPrefixes::_66, OpcodeMap::_0F, 0xD7),
+                _ => unimplemented!("Opcode {:?} not implemented", op),
+            };
+            let w = match dst_size {
+                OperandSize::Size64 => true,
+                _ => false,
+            };
+            let mut vex = VexInstruction::new()
+                .length(VexVectorLength::V128)
+                .w(w)
+                .prefix(prefix)
+                .map(map)
+                .opcode(opcode);
+            vex = match op {
+                // The `vmovq/vmovd` reverse the order of the destination/source
+                // relative to other opcodes using this shape of instruction.
+                AvxOpcode::Vmovd | AvxOpcode::Vmovq => vex
+                    .rm(dst.to_real_reg().unwrap().hw_enc())
+                    .reg(src.to_real_reg().unwrap().hw_enc()),
+                _ => vex
+                    .rm(src.to_real_reg().unwrap().hw_enc())
+                    .reg(dst.to_real_reg().unwrap().hw_enc()),
+            };
+            vex.encode(sink);
+        }
+
+        Inst::GprToXmmVex {
+            op,
+            src,
+            dst,
+            src_size,
+        } => {
+            let dst = allocs.next(dst.to_reg().to_reg());
+            let src = match src.clone().to_reg_mem().with_allocs(allocs) {
+                RegMem::Reg { reg } => {
+                    RegisterOrAmode::Register(reg.to_real_reg().unwrap().hw_enc().into())
+                }
+                RegMem::Mem { addr } => RegisterOrAmode::Amode(addr.finalize(state, sink)),
+            };
+
+            let (prefix, map, opcode) = match op {
+                // vmovd/vmovq are differentiated by `w`
+                AvxOpcode::Vmovd | AvxOpcode::Vmovq => (LegacyPrefixes::_66, OpcodeMap::_0F, 0x6E),
+                AvxOpcode::Vcvtsi2ss => (LegacyPrefixes::_F3, OpcodeMap::_0F, 0x2A),
+                AvxOpcode::Vcvtsi2sd => (LegacyPrefixes::_F2, OpcodeMap::_0F, 0x2A),
+                _ => unimplemented!("Opcode {:?} not implemented", op),
+            };
+            let w = match src_size {
+                OperandSize::Size64 => true,
+                _ => false,
+            };
+            let mut insn = VexInstruction::new()
+                .length(VexVectorLength::V128)
+                .w(w)
+                .prefix(prefix)
+                .map(map)
+                .opcode(opcode)
+                .rm(src)
+                .reg(dst.to_real_reg().unwrap().hw_enc());
+            // These opcodes technically take a second operand which is the
+            // upper bits to preserve during the float conversion. We don't
+            // actually use this in this backend right now so reuse the
+            // destination register. This at least matches what LLVM does.
+            if let AvxOpcode::Vcvtsi2ss | AvxOpcode::Vcvtsi2sd = op {
+                insn = insn.vvvv(dst.to_real_reg().unwrap().hw_enc());
+            }
+            insn.encode(sink);
+        }
+
         Inst::XmmRmREvex {
             op,
             src1,
diff --git a/cranelift/codegen/src/isa/x64/inst/mod.rs b/cranelift/codegen/src/isa/x64/inst/mod.rs
index 179368430c..f9dd071dca 100644
--- a/cranelift/codegen/src/isa/x64/inst/mod.rs
+++ b/cranelift/codegen/src/isa/x64/inst/mod.rs
@@ -158,7 +158,9 @@ impl Inst {
             | Inst::XmmUnaryRmRImmVex { op, .. }
             | Inst::XmmMovRMVex { op, .. }
             | Inst::XmmMovRMImmVex { op, .. }
-            | Inst::XmmToGprImmVex { op, .. } => op.available_from(),
+            | Inst::XmmToGprImmVex { op, .. }
+            | Inst::XmmToGprVex { op, .. }
+            | Inst::GprToXmmVex { op, .. } => op.available_from(),
         }
     }
 }
@@ -1202,6 +1204,18 @@ impl PrettyPrint for Inst {
                 format!("{} {}, {}", ljustify(op.to_string()), src, dst)
             }
 
+            Inst::XmmToGprVex {
+                op,
+                src,
+                dst,
+                dst_size,
+            } => {
+                let dst_size = dst_size.to_bytes();
+                let src = pretty_print_reg(src.to_reg(), 8, allocs);
+                let dst = pretty_print_reg(dst.to_reg().to_reg(), dst_size, allocs);
+                format!("{} {src}, {dst}", ljustify(op.to_string()))
+            }
+
             Inst::XmmToGprImm { op, src, dst, imm } => {
                 let src = pretty_print_reg(src.to_reg(), 8, allocs);
                 let dst = pretty_print_reg(dst.to_reg().to_reg(), 8, allocs);
@@ -1225,6 +1239,17 @@ impl PrettyPrint for Inst {
                 format!("{} {}, {}", ljustify(op.to_string()), src, dst)
             }
 
+            Inst::GprToXmmVex {
+                op,
+                src,
+                src_size,
+                dst,
+            } => {
+                let dst = pretty_print_reg(dst.to_reg().to_reg(), 8, allocs);
+                let src = src.pretty_print(src_size.to_bytes(), allocs);
+                format!("{} {src}, {dst}", ljustify(op.to_string()))
+            }
+
             Inst::XmmCmpRmR { op, src, dst } => {
                 let dst = pretty_print_reg(dst.to_reg(), 8, allocs);
                 let src = src.pretty_print(8, allocs);
@@ -2082,12 +2107,13 @@ fn x64_get_operands<F: Fn(VReg) -> VReg>(inst: &Inst, collector: &mut OperandCol
             collector.reg_fixed_nonallocatable(*dst);
         }
         Inst::XmmToGpr { src, dst, .. }
+        | Inst::XmmToGprVex { src, dst, .. }
         | Inst::XmmToGprImm { src, dst, .. }
         | Inst::XmmToGprImmVex { src, dst, .. } => {
             collector.reg_use(src.to_reg());
             collector.reg_def(dst.to_writable_reg());
         }
-        Inst::GprToXmm { src, dst, .. } => {
+        Inst::GprToXmm { src, dst, .. } | Inst::GprToXmmVex { src, dst, .. } => {
             collector.reg_def(dst.to_writable_reg());
             src.get_operands(collector);
         }
diff --git a/cranelift/codegen/src/isa/x64/lower.isle b/cranelift/codegen/src/isa/x64/lower.isle
index 763fc338e0..ee7ca827bd 100644
--- a/cranelift/codegen/src/isa/x64/lower.isle
+++ b/cranelift/codegen/src/isa/x64/lower.isle
@@ -883,17 +883,17 @@
       (let ((a0 Xmm a)
             (b0 Xmm b)
             ;; a_hi = A >> 32
-            (a_hi Xmm (x64_psrlq a0 (RegMemImm.Imm 32)))
+            (a_hi Xmm (x64_psrlq a0 (xmi_imm 32)))
             ;; ah_bl = Ah * Bl
             (ah_bl Xmm (x64_pmuludq a_hi b0))
             ;; b_hi = B >> 32
-            (b_hi Xmm (x64_psrlq b0 (RegMemImm.Imm 32)))
+            (b_hi Xmm (x64_psrlq b0 (xmi_imm 32)))
             ;; al_bh = Al * Bh
             (al_bh Xmm (x64_pmuludq a0 b_hi))
             ;; aa_bb = ah_bl + al_bh
             (aa_bb Xmm (x64_paddq ah_bl al_bh))
             ;; aa_bb_shifted = aa_bb << 32
-            (aa_bb_shifted Xmm (x64_psllq aa_bb (RegMemImm.Imm 32)))
+            (aa_bb_shifted Xmm (x64_psllq aa_bb (xmi_imm 32)))
             ;; al_bl = Al * Bl
             (al_bl Xmm (x64_pmuludq a0 b0)))
         ;; al_bl + aa_bb_shifted
@@ -1087,14 +1087,12 @@
 ;; Special case for `f32x4.abs`.
 (rule (lower (has_type $F32X4 (fabs x)))
       (x64_andps x
-             (x64_psrld (vector_all_ones)
-                    (RegMemImm.Imm 1))))
+             (x64_psrld (vector_all_ones) (xmi_imm 1))))
 
 ;; Special case for `f64x2.abs`.
 (rule (lower (has_type $F64X2 (fabs x)))
       (x64_andpd x
-             (x64_psrlq (vector_all_ones)
-                    (RegMemImm.Imm 1))))
+             (x64_psrlq (vector_all_ones) (xmi_imm 1))))
 
 ;;;; Rules for `fneg` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
@@ -1106,13 +1104,11 @@
 
 (rule (lower (has_type $F32X4 (fneg x)))
       (x64_xorps x
-             (x64_pslld (vector_all_ones)
-                    (RegMemImm.Imm 31))))
+             (x64_pslld (vector_all_ones) (xmi_imm 31))))
 
 (rule (lower (has_type $F64X2 (fneg x)))
       (x64_xorpd x
-             (x64_psllq (vector_all_ones)
-                    (RegMemImm.Imm 63))))
+             (x64_psllq (vector_all_ones) (xmi_imm 63))))
 
 ;;;; Rules for `bmask` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
@@ -1918,7 +1914,7 @@
             ;; Note that this is a 16x8 shift, but that's OK; we mask
             ;; off anything that traverses from one byte to the next
             ;; with the low_mask below.
-            (shifted_src Xmm (x64_psrlw src (RegMemImm.Imm 4)))
+            (shifted_src Xmm (x64_psrlw src (xmi_imm 4)))
             (high_nibbles Xmm (sse_and $I8X16 shifted_src low_mask))
             (lookup Xmm (x64_xmm_load_const $I8X16 (popcount_4bit_table)))
             (bit_counts_low Xmm (x64_pshufb lookup low_nibbles))
@@ -2237,7 +2233,7 @@
             ;; All-ones for NaN, shifted down to leave 10 top bits (1
             ;; sign, 8 exponent, 1 QNaN bit that must remain set)
             ;; cleared.
-            (nan_fraction_mask Xmm (x64_psrld is_nan_mask (RegMemImm.Imm 10)))
+            (nan_fraction_mask Xmm (x64_psrld is_nan_mask (xmi_imm 10)))
             ;; Do a NAND, so that we retain every bit not set in
             ;; `nan_fraction_mask`. This mask will be all zeroes (so
             ;; we retain every bit) in non-NaN cases, and will have
@@ -2254,7 +2250,7 @@
             (min_or Xmm (x64_orpd min1 min2))
             (is_nan_mask Xmm (x64_cmppd min1 min2 (FcmpImm.Unordered)))
             (min_or_2 Xmm (x64_orpd min_or is_nan_mask))
-            (nan_fraction_mask Xmm (x64_psrlq is_nan_mask (RegMemImm.Imm 13)))
+            (nan_fraction_mask Xmm (x64_psrlq is_nan_mask (xmi_imm 13)))
             (final Xmm (x64_andnpd nan_fraction_mask min_or_2)))
         final))
 
@@ -2302,7 +2298,7 @@
             ;; All-ones for NaN, shifted down to leave 10 top bits (1
             ;; sign, 8 exponent, 1 QNaN bit that must remain set)
             ;; cleared.
-            (nan_fraction_mask Xmm (x64_psrld is_nan_mask (RegMemImm.Imm 10)))
+            (nan_fraction_mask Xmm (x64_psrld is_nan_mask (xmi_imm 10)))
             ;; Do a NAND, so that we retain every bit not set in
             ;; `nan_fraction_mask`. This mask will be all zeroes (so
             ;; we retain every bit) in non-NaN cases, and will have
@@ -2346,7 +2342,7 @@
             ;; All-ones for NaN, shifted down to leave 13 top bits (1
             ;; sign, 11 exponent, 1 QNaN bit that must remain set)
             ;; cleared.
-            (nan_fraction_mask Xmm (x64_psrlq is_nan_mask (RegMemImm.Imm 13)))
+            (nan_fraction_mask Xmm (x64_psrlq is_nan_mask (xmi_imm 13)))
             ;; Do a NAND, so that we retain every bit not set in
             ;; `nan_fraction_mask`. This mask will be all zeroes (so
             ;; we retain every bit) in non-NaN cases, and will have
@@ -3011,8 +3007,8 @@
       (let ((a Xmm val)
 
             ;;  get the low 16 bits
-            (a_lo Xmm (x64_pslld a (RegMemImm.Imm 16)))
-            (a_lo Xmm (x64_psrld a_lo (RegMemImm.Imm 16)))
+            (a_lo Xmm (x64_pslld a (xmi_imm 16)))
+            (a_lo Xmm (x64_psrld a_lo (xmi_imm 16)))
 
             ;; get the high 16 bits
             (a_hi Xmm (x64_psubd a a_lo))
@@ -3022,7 +3018,7 @@
 
             ;; shift the high bits by 1, convert, and double to get the correct
             ;; value
-            (a_hi Xmm (x64_psrld a_hi (RegMemImm.Imm 1)))
+            (a_hi Xmm (x64_psrld a_hi (xmi_imm 1)))
             (a_hi Xmm (x64_cvtdq2ps a_hi))
             (a_hi Xmm (x64_addps a_hi a_hi)))
 
@@ -3060,7 +3056,7 @@
 
             ;; Set top bit only if < 0
             (tmp Xmm (x64_pand dst tmp))
-            (tmp Xmm (x64_psrad tmp (RegMemImm.Imm 31))))
+            (tmp Xmm (x64_psrad tmp (xmi_imm 31))))
 
         ;; On overflow 0x80000000 is returned to a lane.
         ;; Below sets positive overflow lanes to 0x7FFFFFFF
@@ -3130,7 +3126,7 @@
             ;; integer that it can represent. In the case of INT_MAX, this value gets
             ;; represented as 0x4f000000 which is the integer value (INT_MAX+1).
             (tmp2 Xmm (x64_pcmpeqd tmp2 tmp2))
-            (tmp2 Xmm (x64_psrld tmp2 (RegMemImm.Imm 1)))
+            (tmp2 Xmm (x64_psrld tmp2 (xmi_imm 1)))
             (tmp2 Xmm (x64_cvtdq2ps tmp2))
 
             ;; Make a copy of these lanes and then do the first conversion.
diff --git a/cranelift/codegen/src/isa/x64/lower/isle.rs b/cranelift/codegen/src/isa/x64/lower/isle.rs
index 3a397a0eb9..1ca927ec31 100644
--- a/cranelift/codegen/src/isa/x64/lower/isle.rs
+++ b/cranelift/codegen/src/isa/x64/lower/isle.rs
@@ -1038,6 +1038,10 @@ impl Context for IsleContext<'_, '_, MInst, X64Backend> {
                 | bit(h, 7)?,
         )
     }
+
+    fn xmi_imm(&mut self, imm: u32) -> XmmMemImm {
+        XmmMemImm::new(RegMemImm::imm(imm)).unwrap()
+    }
 }
 
 impl IsleContext<'_, '_, MInst, X64Backend> {
diff --git a/cranelift/filetests/filetests/isa/x64/fcvt-avx.clif b/cranelift/filetests/filetests/isa/x64/fcvt-avx.clif
new file mode 100644
index 0000000000..dbdd6cd18c
--- /dev/null
+++ b/cranelift/filetests/filetests/isa/x64/fcvt-avx.clif
@@ -0,0 +1,104 @@
+test compile precise-output
+set enable_simd
+target x86_64 has_avx
+
+function %f3(i32) -> f32 {
+block0(v0: i32):
+  v1 = fcvt_from_sint.f32 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vcvtsi2ss %edi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vcvtsi2ssl %edi, %xmm0, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f4(i64) -> f32 {
+block0(v0: i64):
+  v1 = fcvt_from_sint.f32 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vcvtsi2ss %rdi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vcvtsi2ssq %rdi, %xmm0, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f7(i32) -> f64 {
+block0(v0: i32):
+  v1 = fcvt_from_sint.f64 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vcvtsi2sd %edi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vcvtsi2sdl %edi, %xmm0, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f8(i64) -> f64 {
+block0(v0: i64):
+  v1 = fcvt_from_sint.f64 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vcvtsi2sd %rdi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vcvtsi2sdq %rdi, %xmm0, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
diff --git a/cranelift/filetests/filetests/isa/x64/float-bitcast-avx.clif b/cranelift/filetests/filetests/isa/x64/float-bitcast-avx.clif
new file mode 100644
index 0000000000..4a08cb345c
--- /dev/null
+++ b/cranelift/filetests/filetests/isa/x64/float-bitcast-avx.clif
@@ -0,0 +1,104 @@
+test compile precise-output
+set enable_simd
+target x86_64 has_avx
+
+function %i32_to_f32(i32) -> f32 {
+block0(v0: i32):
+  v1 = bitcast.f32 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vmovd   %edi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vmovd %edi, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %i64_to_f64(i64) -> f64 {
+block0(v0: i64):
+  v1 = bitcast.f64 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vmovq   %rdi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vmovq %rdi, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f32_to_i32(f32) -> i32 {
+block0(v0: f32):
+  v1 = bitcast.i32 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vmovd   %xmm0, %eax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vmovd %xmm0, %eax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f64_to_i64(f64) -> i64 {
+block0(v0: f64):
+  v1 = bitcast.i64 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vmovq   %xmm0, %rax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vmovq %xmm0, %rax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
diff --git a/cranelift/filetests/filetests/isa/x64/float-bitcast.clif b/cranelift/filetests/filetests/isa/x64/float-bitcast.clif
new file mode 100644
index 0000000000..ec29ebc05a
--- /dev/null
+++ b/cranelift/filetests/filetests/isa/x64/float-bitcast.clif
@@ -0,0 +1,104 @@
+test compile precise-output
+set enable_simd
+target x86_64
+
+function %i32_to_f32(i32) -> f32 {
+block0(v0: i32):
+  v1 = bitcast.f32 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   movd    %edi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   movd %edi, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %i64_to_f64(i64) -> f64 {
+block0(v0: i64):
+  v1 = bitcast.f64 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   movq    %rdi, %xmm0
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   movq %rdi, %xmm0
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f32_to_i32(f32) -> i32 {
+block0(v0: f32):
+  v1 = bitcast.i32 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   movd    %xmm0, %eax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   movd %xmm0, %eax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f64_to_i64(f64) -> i64 {
+block0(v0: f64):
+  v1 = bitcast.i64 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   movq    %xmm0, %rax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   movq %xmm0, %rax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
diff --git a/cranelift/filetests/filetests/isa/x64/simd-arith-avx.clif b/cranelift/filetests/filetests/isa/x64/simd-arith-avx.clif
index 15f5c84d15..547cbaf39f 100644
--- a/cranelift/filetests/filetests/isa/x64/simd-arith-avx.clif
+++ b/cranelift/filetests/filetests/isa/x64/simd-arith-avx.clif
@@ -920,7 +920,7 @@ block0(v0: i8x16, v1: i32):
 ;   vpunpcklbw %xmm0, %xmm0, %xmm5
 ;   vpunpckhbw %xmm0, %xmm0, %xmm7
 ;   addl    %r9d, $8, %r9d
-;   movd    %r9d, %xmm11
+;   vmovd   %r9d, %xmm11
 ;   vpsraw  %xmm5, %xmm11, %xmm13
 ;   vpsraw  %xmm7, %xmm11, %xmm15
 ;   vpacksswb %xmm13, %xmm15, %xmm0
@@ -938,7 +938,7 @@ block0(v0: i8x16, v1: i32):
 ;   vpunpcklbw %xmm0, %xmm0, %xmm5
 ;   vpunpckhbw %xmm0, %xmm0, %xmm7
 ;   addl $8, %r9d
-;   movd %r9d, %xmm11
+;   vmovd %r9d, %xmm11
 ;   vpsraw %xmm11, %xmm5, %xmm13
 ;   vpsraw %xmm11, %xmm7, %xmm15
 ;   vpacksswb %xmm15, %xmm13, %xmm0
@@ -992,7 +992,7 @@ block0(v0: i16x8, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $15, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsraw  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1005,7 +1005,7 @@ block0(v0: i16x8, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0xf, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsraw %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1049,7 +1049,7 @@ block0(v0: i32x4, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $31, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsrad  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1062,7 +1062,7 @@ block0(v0: i32x4, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0x1f, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsrad %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1315,7 +1315,7 @@ block0(v0: i8):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   uninit  %xmm4
 ;   vpxor   %xmm4, %xmm4, %xmm6
 ;   vpshufb %xmm2, %xmm6, %xmm0
@@ -1328,7 +1328,7 @@ block0(v0: i8):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpxor %xmm4, %xmm4, %xmm6
 ;   vpshufb %xmm6, %xmm2, %xmm0
 ;   movq %rbp, %rsp
@@ -1389,7 +1389,7 @@ block0(v0: i8x16, v1: i32):
 ; block0:
 ;   movq    %rdi, %r10
 ;   andq    %r10, $7, %r10
-;   movd    %r10d, %xmm5
+;   vmovd   %r10d, %xmm5
 ;   vpsllw  %xmm0, %xmm5, %xmm7
 ;   lea     const(0), %rsi
 ;   shlq    $4, %r10, %r10
@@ -1406,7 +1406,7 @@ block0(v0: i8x16, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %r10
 ;   andq $7, %r10
-;   movd %r10d, %xmm5
+;   vmovd %r10d, %xmm5
 ;   vpsllw %xmm5, %xmm0, %xmm7
 ;   leaq 0x15(%rip), %rsi
 ;   shlq $4, %r10
@@ -1461,7 +1461,7 @@ block0(v0: i16x8, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $15, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsllw  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1474,7 +1474,7 @@ block0(v0: i16x8, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0xf, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsllw %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1518,7 +1518,7 @@ block0(v0: i32x4, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $31, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpslld  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1531,7 +1531,7 @@ block0(v0: i32x4, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0x1f, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpslld %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1575,7 +1575,7 @@ block0(v0: i64x2, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $63, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsllq  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1588,7 +1588,7 @@ block0(v0: i64x2, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0x3f, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsllq %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1632,7 +1632,7 @@ block0(v0: i8x16, v1: i32):
 ; block0:
 ;   movq    %rdi, %r10
 ;   andq    %r10, $7, %r10
-;   movd    %r10d, %xmm5
+;   vmovd   %r10d, %xmm5
 ;   vpsrlw  %xmm0, %xmm5, %xmm7
 ;   lea     const(0), %rsi
 ;   shlq    $4, %r10, %r10
@@ -1648,7 +1648,7 @@ block0(v0: i8x16, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %r10
 ;   andq $7, %r10
-;   movd %r10d, %xmm5
+;   vmovd %r10d, %xmm5
 ;   vpsrlw %xmm5, %xmm0, %xmm7
 ;   leaq 0x15(%rip), %rsi
 ;   shlq $4, %r10
@@ -1713,7 +1713,7 @@ block0(v0: i16x8, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $15, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsrlw  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1726,7 +1726,7 @@ block0(v0: i16x8, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0xf, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsrlw %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1770,7 +1770,7 @@ block0(v0: i32x4, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $31, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsrld  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1783,7 +1783,7 @@ block0(v0: i32x4, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0x1f, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsrld %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -1827,7 +1827,7 @@ block0(v0: i64x2, v1: i32):
 ; block0:
 ;   movq    %rdi, %rcx
 ;   andq    %rcx, $63, %rcx
-;   movd    %ecx, %xmm5
+;   vmovd   %ecx, %xmm5
 ;   vpsrlq  %xmm0, %xmm5, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -1840,7 +1840,7 @@ block0(v0: i64x2, v1: i32):
 ; block1: ; offset 0x4
 ;   movq %rdi, %rcx
 ;   andq $0x3f, %rcx
-;   movd %ecx, %xmm5
+;   vmovd %ecx, %xmm5
 ;   vpsrlq %xmm5, %xmm0, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
diff --git a/cranelift/filetests/filetests/isa/x64/simd-bitwise-avx.clif b/cranelift/filetests/filetests/isa/x64/simd-bitwise-avx.clif
index 023d52d81e..a6e32237e9 100644
--- a/cranelift/filetests/filetests/isa/x64/simd-bitwise-avx.clif
+++ b/cranelift/filetests/filetests/isa/x64/simd-bitwise-avx.clif
@@ -41,7 +41,7 @@ block0(v0: i64):
 ;   movq    %rsp, %rbp
 ; block0:
 ;   movl    $-2147483648, %eax
-;   movd    %eax, %xmm4
+;   vmovd   %eax, %xmm4
 ;   vandnps %xmm4, const(0), %xmm6
 ;   vandps  %xmm4, 0(%rdi), %xmm8
 ;   vorps   %xmm6, %xmm8, %xmm0
@@ -55,7 +55,7 @@ block0(v0: i64):
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
 ;   movl $0x80000000, %eax
-;   movd %eax, %xmm4
+;   vmovd %eax, %xmm4
 ;   vandnps 0x1b(%rip), %xmm4, %xmm6
 ;   vandps (%rdi), %xmm4, %xmm8
 ;   vorps %xmm8, %xmm6, %xmm0
diff --git a/cranelift/filetests/filetests/isa/x64/simd-splat-avx.clif b/cranelift/filetests/filetests/isa/x64/simd-splat-avx.clif
index 8848b6694a..34ce5c50ce 100644
--- a/cranelift/filetests/filetests/isa/x64/simd-splat-avx.clif
+++ b/cranelift/filetests/filetests/isa/x64/simd-splat-avx.clif
@@ -12,7 +12,7 @@ block0(v0: i8):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   uninit  %xmm4
 ;   vpxor   %xmm4, %xmm4, %xmm6
 ;   vpshufb %xmm2, %xmm6, %xmm0
@@ -25,7 +25,7 @@ block0(v0: i8):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpxor %xmm4, %xmm4, %xmm6
 ;   vpshufb %xmm6, %xmm2, %xmm0
 ;   movq %rbp, %rsp
@@ -42,7 +42,7 @@ block0(v0: i16):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   vpshuflw $0, %xmm2, %xmm4
 ;   vpshufd $0, %xmm4, %xmm0
 ;   movq    %rbp, %rsp
@@ -54,7 +54,7 @@ block0(v0: i16):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpshuflw $0, %xmm2, %xmm4
 ;   vpshufd $0, %xmm4, %xmm0
 ;   movq %rbp, %rsp
@@ -71,7 +71,7 @@ block0(v0: i32):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   vpshufd $0, %xmm2, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -82,7 +82,7 @@ block0(v0: i32):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpshufd $0, %xmm2, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -98,7 +98,7 @@ block0(v0: i64):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movq    %rdi, %xmm2
+;   vmovq   %rdi, %xmm2
 ;   vmovddup %xmm2, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -109,7 +109,7 @@ block0(v0: i64):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movq %rdi, %xmm2
+;   vmovq %rdi, %xmm2
 ;   vmovddup %xmm2, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
diff --git a/cranelift/filetests/filetests/isa/x64/simd-splat-avx2.clif b/cranelift/filetests/filetests/isa/x64/simd-splat-avx2.clif
index 84cdfd3730..a7829d9456 100644
--- a/cranelift/filetests/filetests/isa/x64/simd-splat-avx2.clif
+++ b/cranelift/filetests/filetests/isa/x64/simd-splat-avx2.clif
@@ -12,7 +12,7 @@ block0(v0: i8):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   vpbroadcastb %xmm2, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -23,7 +23,7 @@ block0(v0: i8):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpbroadcastb %xmm2, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -39,7 +39,7 @@ block0(v0: i16):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   vpbroadcastw %xmm2, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -50,7 +50,7 @@ block0(v0: i16):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpbroadcastw %xmm2, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -66,7 +66,7 @@ block0(v0: i32):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movd    %edi, %xmm2
+;   vmovd   %edi, %xmm2
 ;   vpbroadcastd %xmm2, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -77,7 +77,7 @@ block0(v0: i32):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movd %edi, %xmm2
+;   vmovd %edi, %xmm2
 ;   vpbroadcastd %xmm2, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
@@ -93,7 +93,7 @@ block0(v0: i64):
 ;   pushq   %rbp
 ;   movq    %rsp, %rbp
 ; block0:
-;   movq    %rdi, %xmm2
+;   vmovq   %rdi, %xmm2
 ;   vmovddup %xmm2, %xmm0
 ;   movq    %rbp, %rsp
 ;   popq    %rbp
@@ -104,7 +104,7 @@ block0(v0: i64):
 ;   pushq %rbp
 ;   movq %rsp, %rbp
 ; block1: ; offset 0x4
-;   movq %rdi, %xmm2
+;   vmovq %rdi, %xmm2
 ;   vmovddup %xmm2, %xmm0
 ;   movq %rbp, %rsp
 ;   popq %rbp
diff --git a/cranelift/filetests/filetests/isa/x64/vhigh_bits-avx.clif b/cranelift/filetests/filetests/isa/x64/vhigh_bits-avx.clif
new file mode 100644
index 0000000000..7579839f80
--- /dev/null
+++ b/cranelift/filetests/filetests/isa/x64/vhigh_bits-avx.clif
@@ -0,0 +1,108 @@
+test compile precise-output
+set enable_simd
+target x86_64 has_avx
+
+function %f1(i8x16) -> i8 {
+block0(v0: i8x16):
+  v1 = vhigh_bits.i8 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vpmovmskb %xmm0, %eax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vpmovmskb %xmm0, %eax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f3(i16x8) -> i8 {
+block0(v0: i16x8):
+  v1 = vhigh_bits.i8 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vpacksswb %xmm0, %xmm0, %xmm2
+;   vpmovmskb %xmm2, %eax
+;   shrq    $8, %rax, %rax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vpacksswb %xmm0, %xmm0, %xmm2
+;   vpmovmskb %xmm2, %eax
+;   shrq $8, %rax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f4(i32x4) -> i8 {
+block0(v0: i32x4):
+  v1 = vhigh_bits.i8 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vmovmskps %xmm0, %eax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vmovmskps %xmm0, %eax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+
+function %f5(i64x2) -> i8 {
+block0(v0: i64x2):
+  v1 = vhigh_bits.i8 v0
+  return v1
+}
+
+; VCode:
+;   pushq   %rbp
+;   movq    %rsp, %rbp
+; block0:
+;   vmovmskpd %xmm0, %eax
+;   movq    %rbp, %rsp
+;   popq    %rbp
+;   ret
+; 
+; Disassembled:
+; block0: ; offset 0x0
+;   pushq %rbp
+;   movq %rsp, %rbp
+; block1: ; offset 0x4
+;   vmovmskpd %xmm0, %eax
+;   movq %rbp, %rsp
+;   popq %rbp
+;   retq
+