File: indirect-global.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 (26 lines) | stat: -rw-r--r-- 960 bytes parent folder | download | duplicates (5) 
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
 
; RUN: opt < %s -basic-aa -globals-aa -gvn -instcombine -S -enable-unsafe-globalsmodref-alias-results | FileCheck %s
; RUN: opt < %s -aa-pipeline=basic-aa,globals-aa -passes="require<globals-aa>,function(gvn,instcombine)" -S -enable-unsafe-globalsmodref-alias-results | FileCheck %s
;
; Note that this test relies on an unsafe feature of GlobalsModRef. While this
; test is correct and safe, GMR's technique for handling this isn't generally.

@G = internal global i32* null		; <i32**> [#uses=3]

declare i8* @malloc(i32)
define void @test() {
	%a = call i8* @malloc(i32 4)
        %A = bitcast i8* %a to i32*
	store i32* %A, i32** @G
	ret void
}

define i32 @test1(i32* %P) {
; CHECK: ret i32 0
	%g1 = load i32*, i32** @G		; <i32*> [#uses=2]
	%h1 = load i32, i32* %g1		; <i32> [#uses=1]
	store i32 123, i32* %P
	%g2 = load i32*, i32** @G		; <i32*> [#uses=0]
	%h2 = load i32, i32* %g1		; <i32> [#uses=1]
	%X = sub i32 %h1, %h2		; <i32> [#uses=1]
	ret i32 %X
}