File: redundant-left-shift-input-masking-pr49778.ll

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (20 lines) | stat: -rw-r--r-- 686 bytes parent folder | download | duplicates (5) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

; PR49778: this should not be folded to 0.
define i32 @src(i1 %x2) {
; CHECK-LABEL: @src(
; CHECK-NEXT:    [[X13:%.*]] = zext i1 [[X2:%.*]] to i32
; CHECK-NEXT:    [[_7:%.*]] = shl i32 -1, [[X13]]
; CHECK-NEXT:    [[MASK:%.*]] = xor i32 [[_7]], -1
; CHECK-NEXT:    [[_8:%.*]] = and i32 [[MASK]], [[X13]]
; CHECK-NEXT:    [[_9:%.*]] = shl i32 [[_8]], [[X13]]
; CHECK-NEXT:    ret i32 [[_9]]
;
  %x13 = zext i1 %x2 to i32
  %_7 = shl i32 4294967295, %x13
  %mask = xor i32 %_7, 4294967295
  %_8 = and i32 %mask, %x13
  %_9 = shl i32 %_8, %x13
  ret i32 %_9
}