File: fold-const.ll

package info (click to toggle)
llvm-3.0 3.0-10
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 75,412 kB
  • sloc: cpp: 468,043; asm: 109,345; ansic: 13,782; sh: 12,935; ml: 4,716; python: 4,351; perl: 2,096; makefile: 1,905; pascal: 1,578; exp: 389; xml: 283; lisp: 187; csh: 117
file content (14 lines) | stat: -rw-r--r-- 357 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
; RUN: llc < %s -march=arm -mattr=+v7 | FileCheck %s

define i32 @f(i32 %a) nounwind readnone optsize ssp {
entry:
  %conv = zext i32 %a to i64
  %tmp1 = tail call i64 @llvm.ctlz.i64(i64 %conv)
; CHECK: clz
; CHECK-NOT: adds
  %cast = trunc i64 %tmp1 to i32
  %sub = sub nsw i32 63, %cast
  ret i32 %sub
}

declare i64 @llvm.ctlz.i64(i64) nounwind readnone