File: 2012-05-17-TwoAddressBug.ll

package info (click to toggle)
llvm-toolchain-9 1%3A9.0.1-16
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 882,436 kB
  • sloc: cpp: 4,167,636; ansic: 714,256; asm: 457,610; python: 155,927; objc: 65,094; sh: 42,856; lisp: 26,908; perl: 7,786; pascal: 7,722; makefile: 6,881; ml: 5,581; awk: 3,648; cs: 2,027; xml: 888; javascript: 381; ruby: 156
file content (16 lines) | stat: -rw-r--r-- 544 bytes parent folder | download | duplicates (36)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
; RUN: llc < %s -mtriple=x86_64-apple-macosx -pre-RA-sched=source | FileCheck %s

; Teach two-address pass to update the "source" map so it doesn't perform a
; non-profitable commute using outdated info. The test case would still fail
; because of poor pre-RA schedule. That will be fixed by MI scheduler.
; rdar://11472010
define i32 @t(i32 %mask) nounwind readnone ssp {
entry:
; CHECK-LABEL: t:
; CHECK-NOT: mov
  %sub = add i32 %mask, -65535
  %shr = lshr i32 %sub, 23
  %and = and i32 %mask, 1
  %add = add i32 %shr, %and
  ret i32 %add
}