File: x86-flags-intrinsics.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (31 lines) | stat: -rw-r--r-- 727 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
 
; RUN: llc -verify-machineinstrs < %s | FileCheck %s
target triple = "i686-pc-win32"

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:      pushl   %ebp
; CHECK-NEXT: movl    %esp, %ebp
; CHECK-NEXT: pushfl
; CHECK-NEXT: popl    %eax
; CHECK-NEXT: popl    %ebp

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   %ebp
; CHECK-NEXT: movl    %esp, %ebp
; CHECK-NEXT: pushl   %ecx
; CHECK-NEXT: popfl
; CHECK-NEXT: popl    %ebp