File: const-pointers.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 (40 lines) | stat: -rw-r--r-- 876 bytes parent folder | download | duplicates (9) 
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
 
; RUN: opt -basic-aa -dse -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"

%t = type { i32 }

@g = global i32 42

define void @test1(%t* noalias %pp) {
  %p = getelementptr inbounds %t, %t* %pp, i32 0, i32 0

  store i32 1, i32* %p; <-- This is dead
  %x = load i32, i32* inttoptr (i32 12345 to i32*)
  store i32 %x, i32* %p
  ret void
; CHECK-LABEL: define void @test1(
; CHECK: store
; CHECK-NOT: store
; CHECK: ret void
}

define void @test3() {
  store i32 1, i32* @g; <-- This is dead.
  store i32 42, i32* @g
  ret void
; CHECK-LABEL: define void @test3(
; CHECK: store
; CHECK-NOT: store
; CHECK: ret void
}

define void @test4(i32* %p) {
  store i32 1, i32* %p
  %x = load i32, i32* @g; <-- %p and @g could alias
  store i32 %x, i32* %p
  ret void
; CHECK-LABEL: define void @test4(
; CHECK: store
; CHECK: store
; CHECK: ret void
}