File: x86-flags-intrinsics.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; RUN: llc -verify-machineinstrs < %s | FileCheck %s
target triple = "i686-pc-win32"

; Check that pushf/popf intrinsics on win32 don't need a frame pointer.
; FIXME: These can't be autogenerated due to the fastcall function name label,
; it seems.

declare i32 @llvm.x86.flags.read.u32()
declare void @llvm.x86.flags.write.u32(i32)

define i32 @read_flags() {
entry:
  %flags = call i32 @llvm.x86.flags.read.u32()
  ret i32 %flags
}

; CHECK-LABEL: _read_flags:
; CHECK:      pushfl
; CHECK-NEXT: popl    %eax
; CHECK-NEXT: retl

define x86_fastcallcc void @write_flags(i32 inreg %arg) {
entry:
  call void @llvm.x86.flags.write.u32(i32 %arg)
  ret void
}

; CHECK-LABEL: @write_flags@4:
; CHECK:      pushl   %ecx
; CHECK-NEXT: popfl
; CHECK-NEXT: retl