x64: Lower fcopysign, ceil, floor, nearest, and trunc in ISLE (#4730)

https://github.com/bytecodealliance/wasmtime/pull/4730

cranelift/codegen/src/isa/x64/lower/isle.rs

@@ -176,6 +176,11 @@ impl Context for IsleContext<'_, '_, MInst, Flags, IsaFlags, 6> {
         imm.encode()
     }
 
+    #[inline]
+    fn encode_round_imm(&mut self, imm: &RoundImm) -> u8 {
+        imm.encode()
+    }
+
     #[inline]
     fn avx512vl_enabled(&mut self, _: Type) -> Option<()> {
         if self.isa_flags.use_avx512vl_simd() {
@@ -248,6 +253,15 @@ impl Context for IsleContext<'_, '_, MInst, Flags, IsaFlags, 6> {
         }
     }
 
+    #[inline]
+    fn use_sse41(&mut self, _: Type) -> Option<()> {
+        if self.isa_flags.use_sse41() {
+            Some(())
+        } else {
+            None
+        }
+    }
+
     #[inline]
     fn imm8_from_value(&mut self, val: Value) -> Option<Imm8Reg> {
         let inst = self.lower_ctx.dfg().value_def(val).inst()?;
@@ -715,6 +729,24 @@ impl Context for IsleContext<'_, '_, MInst, Flags, IsaFlags, 6> {
         regs::rsp().to_real_reg().unwrap().into()
     }
 
+    fn libcall_1(&mut self, libcall: &LibCall, a: Reg) -> Reg {
+        let call_conv = self.lower_ctx.abi().call_conv();
+        let ret_ty = libcall.signature(call_conv).returns[0].value_type;
+        let output_reg = self.lower_ctx.alloc_tmp(ret_ty).only_reg().unwrap();
+
+        emit_vm_call(
+            self.lower_ctx,
+            self.flags,
+            self.triple,
+            libcall.clone(),
+            &[a],
+            &[output_reg],
+        )
+        .expect("Failed to emit LibCall");
+
+        output_reg.to_reg()
+    }
+
     fn libcall_3(&mut self, libcall: &LibCall, a: Reg, b: Reg, c: Reg) -> Reg {
         let call_conv = self.lower_ctx.abi().call_conv();
         let ret_ty = libcall.signature(call_conv).returns[0].value_type;