File: merge-icmp.ll

package info (click to toggle)
llvm-toolchain-5.0 1:5.0.1-2~bpo9+1
  • links: PTS, VCS
  • area: main
  • in suites: stretch-backports
  • size: 553,688 kB
  • sloc: cpp: 2,878,786; ansic: 584,110; asm: 246,252; python: 124,751; objc: 106,925; sh: 21,542; lisp: 8,628; pascal: 5,885; ml: 5,544; perl: 5,312; makefile: 2,208; cs: 2,022; xml: 686; php: 212; csh: 117
file content (29 lines) | stat: -rw-r--r-- 734 bytes parent folder | download | duplicates (22)
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
; RUN: opt -S -instcombine < %s | FileCheck %s

define i1 @test1(i16* %x) {
  %load = load i16, i16* %x, align 4
  %trunc = trunc i16 %load to i8
  %cmp1 = icmp eq i8 %trunc, 127
  %and = and i16 %load, -256
  %cmp2 = icmp eq i16 %and, 17664
  %or = and i1 %cmp1, %cmp2
  ret i1 %or
; CHECK-LABEL: @test1(
; CHECK-NEXT: load i16
; CHECK-NEXT: icmp eq i16 %load, 17791
; CHECK-NEXT: ret i1
}

define i1 @test2(i16* %x) {
  %load = load i16, i16* %x, align 4
  %and = and i16 %load, -256
  %cmp1 = icmp eq i16 %and, 32512
  %trunc = trunc i16 %load to i8
  %cmp2 = icmp eq i8 %trunc, 69
  %or = and i1 %cmp1, %cmp2
  ret i1 %or
; CHECK-LABEL: @test2(
; CHECK-NEXT: load i16
; CHECK-NEXT: icmp eq i16 %load, 32581
; CHECK-NEXT: ret i1
}