File: unreachable_assume.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 (46 lines) | stat: -rw-r--r-- 1,000 bytes parent folder | download | duplicates (12) 
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
 
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -passes=simplifycfg,instcombine -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s

define i32 @assume1(i32 %p) {
; CHECK-LABEL: @assume1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[P:%.*]], 0
; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT:    ret i32 [[P]]
;
entry:
  %cmp = icmp sle i32 %p, 0
  br i1 %cmp, label %if.then, label %if.end

if.then:
  unreachable

if.end:
  %call = call i32 @abs(i32 %p)
  ret i32 %call
}


define i32 @assume2(i32 %p) {
; CHECK-LABEL: @assume2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[P:%.*]], 0
; CHECK-NEXT:    call void @llvm.assume(i1 [[CMP]])
; CHECK-NEXT:    ret i32 [[P]]
;
entry:
  %cmp = icmp sgt i32 %p, 0
  br i1 %cmp, label %if.then, label %if.else

if.then:
  br label %if.end

if.else:
  unreachable

if.end:
  %call = call i32 @abs(i32 %p)
  ret i32 %call
}

declare i32 @abs(i32)