File: pr48778-sdiv-speculation.ll

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-12
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,496,180 kB
  • sloc: cpp: 5,593,972; ansic: 986,872; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,538; xml: 953; cs: 573; fortran: 567
file content (29 lines) | stat: -rw-r--r-- 894 bytes parent folder | download | duplicates (7) 
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
 
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -simplifycfg -S < %s | FileCheck %s

; sdiv INT_MIN / -1 should not be speculated.
define i32 @test(i1 %cmp) {
; CHECK-LABEL: @test(
; CHECK-NEXT:    br i1 [[CMP:%.*]], label [[IF:%.*]], label [[COMMON_RET:%.*]]
; CHECK:       if:
; CHECK-NEXT:    [[DIV:%.*]] = sdiv i32 -2147483648, -1
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[DIV]], 0
; CHECK-NEXT:    [[SPEC_SELECT:%.*]] = select i1 [[CMP2]], i32 1, i32 0
; CHECK-NEXT:    br label [[COMMON_RET]]
; CHECK:       common.ret:
; CHECK-NEXT:    [[COMMON_RET_OP:%.*]] = phi i32 [ 0, [[TMP0:%.*]] ], [ [[SPEC_SELECT]], [[IF]] ]
; CHECK-NEXT:    ret i32 [[COMMON_RET_OP]]
;
  br i1 %cmp, label %if, label %else

if:
  %div = sdiv i32 -2147483648, -1
  %cmp2 = icmp ne i32 %div, 0
  br i1 %cmp2, label %end, label %else

else:
  ret i32 0

end:
  ret i32 1
}