File: cmov-zext.ll

package info (click to toggle)
llvm 2.6-9.1
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 57,604 kB
  • ctags: 44,336
  • sloc: cpp: 344,766; sh: 12,407; ansic: 10,617; ada: 3,070; ml: 2,505; perl: 2,496; makefile: 1,426; pascal: 1,163; exp: 389; asm: 307; python: 298; objc: 260; lisp: 182; csh: 117; xml: 38; f90: 36; tcl: 20
file content (19 lines) | stat: -rw-r--r-- 522 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
; RUN: llvm-as < %s | llc -march=x86-64 | FileCheck %s

; x86's 32-bit cmov doesn't clobber the high 32 bits of the destination
; if the condition is false. An explicit zero-extend (movl) is needed
; after the cmov.

; CHECK:      cmovne  %edi, %esi
; CHECK-NEXT: movl    %esi, %edi

declare void @bar(i64) nounwind

define void @foo(i64 %a, i64 %b, i1 %p) nounwind {
  %c = trunc i64 %a to i32
  %d = trunc i64 %b to i32
  %e = select i1 %p, i32 %c, i32 %d
  %f = zext i32 %e to i64
  call void @bar(i64 %f)
  ret void
}