File: logical-nuke.ll

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm-proposed-updates
  • size: 1,998,492 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (47 lines) | stat: -rw-r--r-- 966 bytes parent folder | download | duplicates (16) 
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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
 
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=sccp -S | FileCheck %s

; Test that SCCP has basic knowledge of when and/or/mul nuke overdefined values.

 define i32 @test(i32 %X) {
; CHECK-LABEL: @test(
; CHECK-NEXT:    ret i32 0
;
  %Y = and i32 %X, 0
  ret i32 %Y
}

define i32 @test2(i32 %X) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    ret i32 -1
;
  %Y = or i32 -1, %X
  ret i32 %Y
}

define i32 @test3(i32 %X) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:    [[Y:%.*]] = and i32 undef, [[X:%.*]]
; CHECK-NEXT:    ret i32 [[Y]]
;
  %Y = and i32 undef, %X
  ret i32 %Y
}

define i32 @test4(i32 %X) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:    [[Y:%.*]] = or i32 [[X:%.*]], undef
; CHECK-NEXT:    ret i32 [[Y]]
;
  %Y = or i32 %X, undef
  ret i32 %Y
}

; X * 0 = 0 even if X is overdefined.
define i32 @test5(i32 %foo) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:    ret i32 0
;
  %patatino = mul i32 %foo, 0
  ret i32 %patatino
}