File: pr24179.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (45 lines) | stat: -rw-r--r-- 1,024 bytes parent folder | download | duplicates (11) 
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
 
; RUN: opt -mem2reg < %s -S | FileCheck %s
; RUN: opt -passes=mem2reg < %s -S | FileCheck %s

declare i32 @def(i32)
declare i1 @use(i32)

; Special case of a single-BB alloca does not apply here since the load
; is affected by the following store. Expect this case to be identified
; and a PHI node to be created.
define void @test1() {
; CHECK-LABEL: @test1(
 entry:
  %t = alloca i32
  br label %loop

 loop:
  %v = load i32, i32* %t
  %c = call i1 @use(i32 %v)
; CHECK: [[PHI:%.*]] = phi i32 [ undef, %entry ], [ %n, %loop ]
; CHECK: call i1 @use(i32 [[PHI]])
  %n = call i32 @def(i32 7)
  store i32 %n, i32* %t
  br i1 %c, label %loop, label %exit

 exit:
  ret void
}

; Same as above, except there is no following store. The alloca should just be
; replaced with an undef
define void @test2() {
; CHECK-LABEL: @test2(
 entry:
  %t = alloca i32
  br label %loop

 loop:
  %v = load i32, i32* %t
  %c = call i1 @use(i32 %v)
; CHECK: %c = call i1 @use(i32 undef)
  br i1 %c, label %loop, label %exit

 exit:
  ret void
}