File: 2009-11-12-MemDepMallocBitCast.ll

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (14 lines) | stat: -rw-r--r-- 540 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
; Test to make sure malloc's bitcast does not block detection of a store 
; to aliased memory; GVN should not optimize away the load in this program.
; RUN: opt < %s -passes=gvn -S | FileCheck %s

define i64 @test() {
  %1 = tail call ptr @malloc(i64 mul (i64 4, i64 ptrtoint (ptr getelementptr (i64, ptr null, i64 1) to i64))) ; <ptr> [#uses=2]
  store i8 42, ptr %1
  %Y = load i64, ptr %1                               ; <i64> [#uses=1]
  ret i64 %Y
; CHECK: %Y = load i64, ptr %1
; CHECK: ret i64 %Y
}

declare noalias ptr @malloc(i64)