55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
|
; RUN: opt < %s -globals-aa -gvn -S | FileCheck %s
|
||
|
|
|
||
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
||
|
|
|
||
|
|
@a = internal global i32* null, align 8
|
||
|
|
@b = global i32** @a, align 8
|
||
|
|
@c = global i32** @a, align 8
|
||
|
|
@d = common global i32 0, align 4
|
||
|
|
|
||
|
|
; Make sure we globals-aa doesn't get confused and allow hoisting
|
||
|
|
; the load from @a out of the loop.
|
||
|
|
|
||
|
|
; CHECK-LABEL: define i32 @main()
|
||
|
|
; CHECK: for.body:
|
||
|
|
; CHECK-NEXT: %2 = load i32**, i32*** @b, align 8
|
||
|
|
; CHECK-NEXT: store i32* @d, i32** %2, align 8
|
||
|
|
; CHECK-NEXT: %3 = load i32*, i32** @a, align 8
|
||
|
|
; CHECK-NEXT: %cmp1 = icmp ne i32* %3, @d
|
||
|
|
; CHECK-NEXT: br i1 %cmp1, label %if.then, label %if.end
|
||
|
|
|
||
|
|
define i32 @main() {
|
||
|
|
entry:
|
||
|
|
%0 = load i32, i32* @d, align 4
|
||
|
|
br label %for.cond
|
||
|
|
|
||
|
|
for.cond: ; preds = %if.end, %entry
|
||
|
|
%1 = phi i32 [ %inc, %if.end ], [ %0, %entry ]
|
||
|
|
%cmp = icmp slt i32 %1, 1
|
||
|
|
br i1 %cmp, label %for.body, label %for.end
|
||
|
|
|
||
|
|
for.body: ; preds = %for.cond
|
||
|
|
%2 = load i32**, i32*** @b, align 8
|
||
|
|
store i32* @d, i32** %2, align 8
|
||
|
|
%3 = load i32*, i32** @a, align 8
|
||
|
|
%cmp1 = icmp ne i32* %3, @d
|
||
|
|
br i1 %cmp1, label %if.then, label %if.end
|
||
|
|
|
||
|
|
if.then: ; preds = %for.body
|
||
|
|
br label %return
|
||
|
|
|
||
|
|
if.end: ; preds = %for.body
|
||
|
|
%4 = load i32, i32* @d, align 4
|
||
|
|
%inc = add nsw i32 %4, 1
|
||
|
|
store i32 %inc, i32* @d, align 4
|
||
|
|
br label %for.cond
|
||
|
|
|
||
|
|
for.end: ; preds = %for.cond
|
||
|
|
br label %return
|
||
|
|
|
||
|
|
return: ; preds = %for.end, %if.then
|
||
|
|
%retval.0 = phi i32 [ 1, %if.then ], [ 0, %for.end ]
|
||
|
|
ret i32 %retval.0
|
||
|
|
}
|
||
|
|
|