File: phi-select.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-6~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,418,812 kB
  • sloc: cpp: 5,290,827; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,900; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,892; xml: 953; cs: 573; fortran: 539
file content (27 lines) | stat: -rw-r--r-- 790 bytes parent folder | download | duplicates (14) 
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
 
; Test that PHI nodes and select instructions do not necessarily make stuff
; non-constant.

; RUN: opt < %s -globalopt -S | FileCheck %s
; CHECK-NOT: global

@X = internal global i32 4              ; <i32*> [#uses=2]
@Y = internal global i32 5              ; <i32*> [#uses=2]

define i32 @test1(i1 %C) {
        %P = select i1 %C, i32* @X, i32* @Y             ; <i32*> [#uses=1]
        %V = load i32, i32* %P               ; <i32> [#uses=1]
        ret i32 %V
}

define i32 @test2(i1 %C) {
; <label>:0
        br i1 %C, label %T, label %Cont

T:              ; preds = %0
        br label %Cont

Cont:           ; preds = %T, %0
        %P = phi i32* [ @X, %0 ], [ @Y, %T ]            ; <i32*> [#uses=1]
        %V = load i32, i32* %P               ; <i32> [#uses=1]
        ret i32 %V
}