diff --git a/cranelift/codegen/meta/src/isa/x86/instructions.rs b/cranelift/codegen/meta/src/isa/x86/instructions.rs
index 2675937353..b15be24546 100644
--- a/cranelift/codegen/meta/src/isa/x86/instructions.rs
+++ b/cranelift/codegen/meta/src/isa/x86/instructions.rs
@@ -342,9 +342,9 @@ pub(crate) fn define(
         The lane index, ``Idx``, is an immediate value, not an SSA value. It
         must indicate a valid lane index for the type of ``x``.
         "#,
-            &formats.insert_lane,
+            &formats.ternary_imm8,
         )
-        .operands_in(vec![x, Idx, y])
+        .operands_in(vec![x, y, Idx])
         .operands_out(vec![a]),
     );
 
@@ -369,9 +369,9 @@ pub(crate) fn define(
         extracted from and which it is inserted to. This is similar to x86_pinsr but inserts
         floats, which are already stored in an XMM register.
         "#,
-            &formats.insert_lane,
+            &formats.ternary_imm8,
         )
-        .operands_in(vec![x, Idx, y])
+        .operands_in(vec![x, y, Idx])
         .operands_out(vec![a]),
     );
 
diff --git a/cranelift/codegen/meta/src/isa/x86/legalize.rs b/cranelift/codegen/meta/src/isa/x86/legalize.rs
index 13da4a365a..5d7e3c7619 100644
--- a/cranelift/codegen/meta/src/isa/x86/legalize.rs
+++ b/cranelift/codegen/meta/src/isa/x86/legalize.rs
@@ -460,7 +460,7 @@ fn define_simd(shared: &mut SharedDefinitions, x86_instructions: &InstructionGro
                 // Move into the lowest 16 bits of an XMM register.
                 def!(a = scalar_to_vector(x)),
                 // Insert the value again but in the next lowest 16 bits.
-                def!(b = insertlane(a, uimm8_one, x)),
+                def!(b = insertlane(a, x, uimm8_one)),
                 // No instruction emitted; pretend this is an I32x4 so we can use PSHUFD.
                 def!(c = raw_bitcast_any16x8_to_i32x4(b)),
                 // Broadcast the bytes in the XMM register with PSHUFD.
@@ -494,7 +494,7 @@ fn define_simd(shared: &mut SharedDefinitions, x86_instructions: &InstructionGro
                 // Move into the lowest 64 bits of an XMM register.
                 def!(a = scalar_to_vector(x)),
                 // Move into the highest 64 bits of the same XMM register.
-                def!(y = insertlane(a, uimm8_one, x)),
+                def!(y = insertlane(a, x, uimm8_one)),
             ],
         );
     }
@@ -568,11 +568,11 @@ fn define_simd(shared: &mut SharedDefinitions, x86_instructions: &InstructionGro
                 // Use scalar operations to shift the first lane.
                 def!(a = extractlane(x, uimm8_zero)),
                 def!(b = sshr_scalar_lane0(a, y)),
-                def!(c = insertlane(x, uimm8_zero, b)),
+                def!(c = insertlane(x, b, uimm8_zero)),
                 // Do the same for the second lane.
                 def!(d = extractlane(x, uimm8_one)),
                 def!(e = sshr_scalar_lane1(d, y)),
-                def!(z = insertlane(c, uimm8_one, e)),
+                def!(z = insertlane(c, e, uimm8_one)),
             ],
         );
     }
diff --git a/cranelift/codegen/meta/src/isa/x86/recipes.rs b/cranelift/codegen/meta/src/isa/x86/recipes.rs
index 42e45d0328..db28f73e03 100644
--- a/cranelift/codegen/meta/src/isa/x86/recipes.rs
+++ b/cranelift/codegen/meta/src/isa/x86/recipes.rs
@@ -608,12 +608,12 @@ pub(crate) fn define<'shared>(
     // XX /r with FPR ins and outs. A form with a byte immediate.
     {
         recipes.add_template_inferred(
-            EncodingRecipeBuilder::new("fa_ib", &formats.insert_lane, 2)
+            EncodingRecipeBuilder::new("fa_ib", &formats.ternary_imm8, 2)
                 .operands_in(vec![fpr, fpr])
                 .operands_out(vec![0])
                 .inst_predicate(InstructionPredicate::new_is_unsigned_int(
-                    &*formats.insert_lane,
-                    "lane",
+                    &*formats.ternary_imm8,
+                    "imm",
                     8,
                     0,
                 ))
@@ -621,7 +621,7 @@ pub(crate) fn define<'shared>(
                     r#"
                     {{PUT_OP}}(bits, rex2(in_reg1, in_reg0), sink);
                     modrm_rr(in_reg1, in_reg0, sink);
-                    let imm:i64 = lane.into();
+                    let imm: i64 = imm.into();
                     sink.put1(imm as u8);
                 "#,
                 ),
@@ -1040,12 +1040,12 @@ pub(crate) fn define<'shared>(
     // XX /r ib with 8-bit unsigned immediate (e.g. for insertlane)
     {
         recipes.add_template_inferred(
-            EncodingRecipeBuilder::new("r_ib_unsigned_r", &formats.insert_lane, 2)
+            EncodingRecipeBuilder::new("r_ib_unsigned_r", &formats.ternary_imm8, 2)
                 .operands_in(vec![fpr, gpr])
                 .operands_out(vec![0])
                 .inst_predicate(InstructionPredicate::new_is_unsigned_int(
-                    &*formats.insert_lane,
-                    "lane",
+                    &*formats.ternary_imm8,
+                    "imm",
                     8,
                     0,
                 ))
@@ -1053,7 +1053,7 @@ pub(crate) fn define<'shared>(
                     r#"
                     {{PUT_OP}}(bits, rex2(in_reg1, in_reg0), sink);
                     modrm_rr(in_reg1, in_reg0, sink);
-                    let imm:i64 = lane.into();
+                    let imm: i64 = imm.into();
                     sink.put1(imm as u8);
                 "#,
                 ),
diff --git a/cranelift/codegen/meta/src/shared/formats.rs b/cranelift/codegen/meta/src/shared/formats.rs
index 03c09e2e2b..455920eba5 100644
--- a/cranelift/codegen/meta/src/shared/formats.rs
+++ b/cranelift/codegen/meta/src/shared/formats.rs
@@ -24,7 +24,6 @@ pub(crate) struct Formats {
     pub(crate) func_addr: Rc<InstructionFormat>,
     pub(crate) heap_addr: Rc<InstructionFormat>,
     pub(crate) indirect_jump: Rc<InstructionFormat>,
-    pub(crate) insert_lane: Rc<InstructionFormat>,
     pub(crate) int_compare: Rc<InstructionFormat>,
     pub(crate) int_compare_imm: Rc<InstructionFormat>,
     pub(crate) int_cond: Rc<InstructionFormat>,
@@ -45,6 +44,7 @@ pub(crate) struct Formats {
     pub(crate) store_complex: Rc<InstructionFormat>,
     pub(crate) table_addr: Rc<InstructionFormat>,
     pub(crate) ternary: Rc<InstructionFormat>,
+    pub(crate) ternary_imm8: Rc<InstructionFormat>,
     pub(crate) trap: Rc<InstructionFormat>,
     pub(crate) unary: Rc<InstructionFormat>,
     pub(crate) unary_bool: Rc<InstructionFormat>,
@@ -88,18 +88,18 @@ impl Formats {
                 .typevar_operand(1)
                 .build(),
 
+            ternary_imm8: Builder::new("TernaryImm8")
+                .value()
+                .imm(&imm.uimm8)
+                .value()
+                .build(),
+
             // Catch-all for instructions with many outputs and inputs and no immediate
             // operands.
             multiary: Builder::new("MultiAry").varargs().build(),
 
             nullary: Builder::new("NullAry").build(),
 
-            insert_lane: Builder::new("InsertLane")
-                .value()
-                .imm_with_name("lane", &imm.uimm8)
-                .value()
-                .build(),
-
             extract_lane: Builder::new("ExtractLane")
                 .value()
                 .imm_with_name("lane", &imm.uimm8)
diff --git a/cranelift/codegen/meta/src/shared/instructions.rs b/cranelift/codegen/meta/src/shared/instructions.rs
index 3a85f80599..f2bed0e330 100644
--- a/cranelift/codegen/meta/src/shared/instructions.rs
+++ b/cranelift/codegen/meta/src/shared/instructions.rs
@@ -559,9 +559,9 @@ fn define_simd_lane_access(
         The lane index, ``Idx``, is an immediate value, not an SSA value. It
         must indicate a valid lane index for the type of ``x``.
         "#,
-            &formats.insert_lane,
+            &formats.ternary_imm8,
         )
-        .operands_in(vec![x, Idx, y])
+        .operands_in(vec![x, y, Idx])
         .operands_out(vec![a]),
     );
 
diff --git a/cranelift/codegen/src/isa/x86/enc_tables.rs b/cranelift/codegen/src/isa/x86/enc_tables.rs
index 1d071d643b..a2897c6d78 100644
--- a/cranelift/codegen/src/isa/x86/enc_tables.rs
+++ b/cranelift/codegen/src/isa/x86/enc_tables.rs
@@ -1251,10 +1251,10 @@ fn convert_insertlane(
     let mut pos = FuncCursor::new(func).at_inst(inst);
     pos.use_srcloc(inst);
 
-    if let ir::InstructionData::InsertLane {
+    if let ir::InstructionData::TernaryImm8 {
         opcode: ir::Opcode::Insertlane,
         args: [vector, replacement],
-        lane,
+        imm: lane,
     } = pos.func.dfg[inst]
     {
         let value_type = pos.func.dfg.value_type(vector);
@@ -1269,7 +1269,7 @@ fn convert_insertlane(
                     pos.func
                         .dfg
                         .replace(inst)
-                        .x86_insertps(vector, immediate, replacement)
+                        .x86_insertps(vector, replacement, immediate)
                 }
                 F64X2 => {
                     let replacement_as_vector = pos.ins().raw_bitcast(F64X2, replacement); // only necessary due to SSA types
@@ -1297,7 +1297,7 @@ fn convert_insertlane(
             pos.func
                 .dfg
                 .replace(inst)
-                .x86_pinsr(vector, lane, replacement);
+                .x86_pinsr(vector, replacement, lane);
         }
     }
 }
@@ -1340,7 +1340,7 @@ fn expand_dword_to_xmm<'f>(
     if arg_type == I64 {
         let (arg_lo, arg_hi) = pos.ins().isplit(arg);
         let arg = pos.ins().scalar_to_vector(I32X4, arg_lo);
-        let arg = pos.ins().insertlane(arg, 1, arg_hi);
+        let arg = pos.ins().insertlane(arg, arg_hi, 1);
         let arg = pos.ins().raw_bitcast(I64X2, arg);
         arg
     } else {
diff --git a/cranelift/codegen/src/verifier/mod.rs b/cranelift/codegen/src/verifier/mod.rs
index 7f6953c7e5..5010446309 100644
--- a/cranelift/codegen/src/verifier/mod.rs
+++ b/cranelift/codegen/src/verifier/mod.rs
@@ -758,7 +758,7 @@ impl<'a> Verifier<'a> {
             | Binary { .. }
             | BinaryImm { .. }
             | Ternary { .. }
-            | InsertLane { .. }
+            | TernaryImm8 { .. }
             | ExtractLane { .. }
             | Shuffle { .. }
             | IntCompare { .. }
@@ -1918,14 +1918,14 @@ impl<'a> Verifier<'a> {
                 arg,
                 ..
             }
-            | ir::InstructionData::InsertLane {
+            | ir::InstructionData::TernaryImm8 {
                 opcode: ir::instructions::Opcode::Insertlane,
-                lane,
+                imm: lane,
                 args: [arg, _],
                 ..
             } => {
                 // We must be specific about the opcodes above because other instructions are using
-                // the ExtractLane/InsertLane formats.
+                // the same formats.
                 let ty = self.func.dfg.value_type(arg);
                 if u16::from(lane) >= ty.lane_count() {
                     errors.fatal((
diff --git a/cranelift/codegen/src/write.rs b/cranelift/codegen/src/write.rs
index acf181af2b..0aada7d79d 100644
--- a/cranelift/codegen/src/write.rs
+++ b/cranelift/codegen/src/write.rs
@@ -518,7 +518,7 @@ pub fn write_operands(
             }
         }
         NullAry { .. } => write!(w, " "),
-        InsertLane { lane, args, .. } => write!(w, " {}, {}, {}", args[0], lane, args[1]),
+        TernaryImm8 { imm, args, .. } => write!(w, " {}, {}, {}", args[0], args[1], imm),
         ExtractLane { lane, arg, .. } => write!(w, " {}, {}", arg, lane),
         Shuffle { mask, args, .. } => {
             let data = dfg.immediates.get(mask).expect(
diff --git a/cranelift/filetests/filetests/isa/x86/simd-bitwise-legalize.clif b/cranelift/filetests/filetests/isa/x86/simd-bitwise-legalize.clif
index 102719351b..7193aa2b54 100644
--- a/cranelift/filetests/filetests/isa/x86/simd-bitwise-legalize.clif
+++ b/cranelift/filetests/filetests/isa/x86/simd-bitwise-legalize.clif
@@ -91,10 +91,10 @@ block0:
     v2 = sshr v1, v0
     ; check:  v3 = x86_pextr v1, 0
     ; nextln: v4 = sshr v3, v0
-    ; nextln: v5 = x86_pinsr v1, 0, v4
+    ; nextln: v5 = x86_pinsr v1, v4, 0
     ; nextln: v6 = x86_pextr v1, 1
     ; nextln: v7 = sshr v6, v0
-    ; nextln: v2 = x86_pinsr v5, 1, v7
+    ; nextln: v2 = x86_pinsr v5, v7, 1
     return v2
 }
 
diff --git a/cranelift/filetests/filetests/isa/x86/simd-lane-access-binemit.clif b/cranelift/filetests/filetests/isa/x86/simd-lane-access-binemit.clif
index a1ffac1822..e5eea1f637 100644
--- a/cranelift/filetests/filetests/isa/x86/simd-lane-access-binemit.clif
+++ b/cranelift/filetests/filetests/isa/x86/simd-lane-access-binemit.clif
@@ -10,7 +10,7 @@ block0:
 [-, %rax]   v0 = bconst.b8 true
 [-, %rbx]   v1 = bconst.b8 false
 [-, %xmm0]  v2 = splat.b8x16 v0
-[-, %xmm0]  v3 = x86_pinsr v2, 10, v1    ; bin: 66 0f 3a 20 c3 0a
+[-, %xmm0]  v3 = x86_pinsr v2, v1, 10    ; bin: 66 0f 3a 20 c3 0a
             return
 }
 
@@ -19,7 +19,7 @@ block0:
 [-, %rax]   v0 = iconst.i16 4
 [-, %rbx]   v1 = iconst.i16 5
 [-, %xmm1]  v2 = splat.i16x8 v0
-[-, %xmm1]  v3 = x86_pinsr v2, 4, v1    ; bin: 66 0f c4 cb 04
+[-, %xmm1]  v3 = x86_pinsr v2, v1, 4    ; bin: 66 0f c4 cb 04
             return
 }
 
@@ -28,7 +28,7 @@ block0:
 [-, %rax]   v0 = iconst.i32 42
 [-, %rbx]   v1 = iconst.i32 99
 [-, %xmm4]  v2 = splat.i32x4 v0
-[-, %xmm4]  v3 = x86_pinsr v2, 2, v1    ; bin: 66 0f 3a 22 e3 02
+[-, %xmm4]  v3 = x86_pinsr v2, v1, 2    ; bin: 66 0f 3a 22 e3 02
             return
 }
 
@@ -37,7 +37,7 @@ block0:
 [-, %rax]   v0 = bconst.b64 true
 [-, %rbx]   v1 = bconst.b64 false
 [-, %xmm2]  v2 = splat.b64x2 v0
-[-, %xmm2]  v3 = x86_pinsr v2, 1, v1    ; bin: 66 48 0f 3a 22 d3 01
+[-, %xmm2]  v3 = x86_pinsr v2, v1, 1    ; bin: 66 48 0f 3a 22 d3 01
             return
 }
 
diff --git a/cranelift/filetests/filetests/isa/x86/simd-lane-access-legalize.clif b/cranelift/filetests/filetests/isa/x86/simd-lane-access-legalize.clif
index 5480116404..0f22ed3669 100644
--- a/cranelift/filetests/filetests/isa/x86/simd-lane-access-legalize.clif
+++ b/cranelift/filetests/filetests/isa/x86/simd-lane-access-legalize.clif
@@ -55,7 +55,7 @@ block0:
 ; check:   block0:
 ; nextln:     v0 = iconst.i64 42
 ; nextln:     v2 = scalar_to_vector.i64x2 v0
-; nextln:     v1 = x86_pinsr v2, 1, v0
+; nextln:     v1 = x86_pinsr v2, v0, 1
 ; nextln:     return v1
 
 function %splat_b16() -> b16x8 {
@@ -67,7 +67,7 @@ block0:
 ; check:   block0:
 ; nextln:     v0 = bconst.b16 true
 ; nextln:     v2 = scalar_to_vector.b16x8 v0
-; nextln:     v3 = x86_pinsr v2, 1, v0
+; nextln:     v3 = x86_pinsr v2, v0, 1
 ; nextln:     v4 = raw_bitcast.i32x4 v3
 ; nextln:     v5 = x86_pshufd v4, 0
 ; nextln:     v1 = raw_bitcast.b16x8 v5
diff --git a/cranelift/filetests/filetests/isa/x86/simd-lane-access-run.clif b/cranelift/filetests/filetests/isa/x86/simd-lane-access-run.clif
index 115a0be7cb..00ebae26f6 100644
--- a/cranelift/filetests/filetests/isa/x86/simd-lane-access-run.clif
+++ b/cranelift/filetests/filetests/isa/x86/simd-lane-access-run.clif
@@ -62,7 +62,7 @@ block0:
     v1 = bconst.b8 true
     v2 = vconst.b8x16 [false false false false false false false false false false false false false
      false false false]
-    v3 = insertlane v2, 10, v1
+    v3 = insertlane v2, v1, 10
     v4 = extractlane v3, 10
     return v4
 }
@@ -72,7 +72,7 @@ function %insertlane_f32() -> b1 {
 block0:
     v0 = f32const 0x42.42
     v1 = vconst.f32x4 0x00
-    v2 = insertlane v1, 1, v0
+    v2 = insertlane v1, v0, 1
     v3 = extractlane v2, 1
     v4 = fcmp eq v3, v0
     return v4
@@ -83,7 +83,7 @@ function %insertlane_f64_lane1() -> b1 {
 block0:
     v0 = f64const 0x42.42
     v1 = vconst.f64x2 0x00
-    v2 = insertlane v1, 1, v0
+    v2 = insertlane v1, v0, 1
     v3 = extractlane v2, 1
     v4 = fcmp eq v3, v0
     return v4
@@ -94,7 +94,7 @@ function %insertlane_f64_lane0() -> b1 {
 block0:
     v0 = f64const 0x42.42
     v1 = vconst.f64x2 0x00
-    v2 = insertlane v1, 0, v0
+    v2 = insertlane v1, v0, 0
     v3 = extractlane v2, 0
     v4 = fcmp eq v3, v0
     return v4
@@ -135,7 +135,7 @@ block0:
     v1 = iconst.i32 99
 
     v2 = splat.i32x4 v0
-    v3 = insertlane v2, 2, v1
+    v3 = insertlane v2, v1, 2
 
     v4 = extractlane v3, 3
     v5 = icmp eq v4, v0
@@ -154,7 +154,7 @@ block0:
     v1 = f32const 0x99.99
 
     v2 = splat.f32x4 v0
-    v3 = insertlane v2, 2, v1
+    v3 = insertlane v2, v1, 2
 
     v4 = extractlane v3, 3
     v5 = fcmp eq v4, v0
diff --git a/cranelift/filetests/filetests/parser/tiny.clif b/cranelift/filetests/filetests/parser/tiny.clif
index 3f825e6eac..42fa5a8157 100644
--- a/cranelift/filetests/filetests/parser/tiny.clif
+++ b/cranelift/filetests/filetests/parser/tiny.clif
@@ -67,13 +67,13 @@ function %lanes() {
 block0:
     v0 = iconst.i32x4 2
     v1 = extractlane v0, 3
-    v2 = insertlane v0, 1, v1
+    v2 = insertlane v0, v1, 1
 }
 ; sameln: function %lanes() fast {
 ; nextln: block0:
 ; nextln:     v0 = iconst.i32x4 2
 ; nextln:     v1 = extractlane v0, 3
-; nextln:     v2 = insertlane v0, 1, v1
+; nextln:     v2 = insertlane v0, v1, 1
 ; nextln: }
 
 ; Integer condition codes.
diff --git a/cranelift/filetests/filetests/verifier/simd-lane-index.clif b/cranelift/filetests/filetests/verifier/simd-lane-index.clif
index 2f7ca8d095..b8051a6b5a 100644
--- a/cranelift/filetests/filetests/verifier/simd-lane-index.clif
+++ b/cranelift/filetests/filetests/verifier/simd-lane-index.clif
@@ -6,7 +6,7 @@ function %insertlane_i32x4() {
 block0:
     v0 = vconst.i32x4 [0 0 0 0]
     v1 = iconst.i32 42
-    v2 = insertlane v0, 4, v1 ; error: The lane 4 does not index into the type i32x4
+    v2 = insertlane v0, v1, 4 ; error: The lane 4 does not index into the type i32x4
     return
 }
 
@@ -14,7 +14,7 @@ function %insertlane_b16x8() {
 block0:
     v0 = vconst.b16x8 [false false false false false false false false]
     v1 = bconst.b16 true
-    v2 = insertlane v0, 8, v1 ; error: The lane 8 does not index into the type b16x8
+    v2 = insertlane v0, v1, 8 ; error: The lane 8 does not index into the type b16x8
     return
 }
 
@@ -22,7 +22,7 @@ function %insertlane_f64x2() {
 block0:
     v0 = vconst.f64x2 0x00
     v1 = f64const 0x0.1
-    v2 = insertlane v0, 2, v1 ; error: The lane 2 does not index into the type f64x2
+    v2 = insertlane v0, v1, 2 ; error: The lane 2 does not index into the type f64x2
     return
 }
 
diff --git a/cranelift/reader/src/parser.rs b/cranelift/reader/src/parser.rs
index 08942962ed..47e6e695fe 100644
--- a/cranelift/reader/src/parser.rs
+++ b/cranelift/reader/src/parser.rs
@@ -2887,15 +2887,15 @@ impl<'a> Parser<'a> {
                 ctx.check_jt(table, self.loc)?;
                 InstructionData::IndirectJump { opcode, arg, table }
             }
-            InstructionFormat::InsertLane => {
+            InstructionFormat::TernaryImm8 => {
                 let lhs = self.match_value("expected SSA value first operand")?;
                 self.match_token(Token::Comma, "expected ',' between operands")?;
-                let lane = self.match_uimm8("expected lane number")?;
-                self.match_token(Token::Comma, "expected ',' between operands")?;
                 let rhs = self.match_value("expected SSA value last operand")?;
-                InstructionData::InsertLane {
+                self.match_token(Token::Comma, "expected ',' between operands")?;
+                let imm = self.match_uimm8("expected 8-bit immediate")?;
+                InstructionData::TernaryImm8 {
                     opcode,
-                    lane,
+                    imm,
                     args: [lhs, rhs],
                 }
             }
diff --git a/cranelift/serde/src/serde_clif_json.rs b/cranelift/serde/src/serde_clif_json.rs
index 2d950cf3a8..efa0ee2815 100644
--- a/cranelift/serde/src/serde_clif_json.rs
+++ b/cranelift/serde/src/serde_clif_json.rs
@@ -41,6 +41,11 @@ pub enum SerInstData {
         opcode: String,
         args: [String; 3],
     },
+    TernaryImm8 {
+        opcode: String,
+        args: [String; 2],
+        imm: String,
+    },
     MultiAry {
         opcode: String,
         args: Vec<String>,
@@ -48,11 +53,6 @@ pub enum SerInstData {
     NullAry {
         opcode: String,
     },
-    InsertLane {
-        opcode: String,
-        args: [String; 2],
-        lane: String,
-    },
     ExtractLane {
         opcode: String,
         arg: String,
@@ -323,12 +323,12 @@ pub fn get_inst_data(inst_index: Inst, func: &Function) -> SerInstData {
         InstructionData::NullAry { opcode } => SerInstData::NullAry {
             opcode: opcode.to_string(),
         },
-        InstructionData::InsertLane { opcode, args, lane } => {
+        InstructionData::TernaryImm8 { opcode, args, imm } => {
             let hold_args = [args[0].to_string(), args[1].to_string()];
-            SerInstData::InsertLane {
+            SerInstData::TernaryImm8 {
                 opcode: opcode.to_string(),
                 args: hold_args,
-                lane: lane.to_string(),
+                imm: imm.to_string(),
             }
         }
         InstructionData::ExtractLane { opcode, arg, lane } => SerInstData::ExtractLane {
diff --git a/cranelift/wasm/src/code_translator.rs b/cranelift/wasm/src/code_translator.rs
index f7a8ee8bfd..a8db0433bc 100644
--- a/cranelift/wasm/src/code_translator.rs
+++ b/cranelift/wasm/src/code_translator.rs
@@ -1306,7 +1306,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
             let ty = type_of(op);
             let reduced = builder.ins().ireduce(ty.lane_type(), replacement);
             let vector = optionally_bitcast_vector(vector, ty, builder);
-            state.push1(builder.ins().insertlane(vector, *lane, reduced))
+            state.push1(builder.ins().insertlane(vector, reduced, *lane))
         }
         Operator::I32x4ReplaceLane { lane }
         | Operator::I64x2ReplaceLane { lane }
@@ -1314,7 +1314,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
         | Operator::F64x2ReplaceLane { lane } => {
             let (vector, replacement) = state.pop2();
             let vector = optionally_bitcast_vector(vector, type_of(op), builder);
-            state.push1(builder.ins().insertlane(vector, *lane, replacement))
+            state.push1(builder.ins().insertlane(vector, replacement, *lane))
         }
         Operator::V8x16Shuffle { lanes, .. } => {
             let (a, b) = pop2_with_bitcast(state, I8X16, builder);