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; RUN: opt -S -gvn-hoist < %s | FileCheck %s
; CHECK-LABEL: build_tree
; CHECK: load
; CHECK: load
; Check that the load is not hoisted because the call can potentially
; modify the global
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
@heap = external global i32, align 4
define i32 @build_tree() unnamed_addr {
entry:
br label %do.body
do.body: ; preds = %do.body, %entry
%tmp9 = load i32, i32* @heap, align 4
%cmp = call i1 @pqdownheap(i32 %tmp9)
br i1 %cmp, label %do.body, label %do.end
do.end: ; preds = %do.body
%tmp20 = load i32, i32* @heap, align 4
ret i32 %tmp20
}
declare i1 @pqdownheap(i32)
@i = external hidden unnamed_addr global i32, align 4
@j = external hidden unnamed_addr global [573 x i32], align 4
@v = external global i1
; CHECK-LABEL: test
; CHECK-LABEL: do.end
; CHECK: load
; Check that the load is not hoisted because the call can potentially
; modify the global
define i32 @test() {
entry:
br label %for.cond
for.cond:
%a3 = load volatile i1, i1* @v
br i1 %a3, label %for.body, label %while.end
for.body:
br label %if.then
if.then:
%tmp4 = load i32, i32* @i, align 4
br label %for.cond
while.end:
br label %do.body
do.body:
%tmp9 = load i32, i32* getelementptr inbounds ([573 x i32], [573 x i32]* @j,
i32 0, i32 1), align 4
%tmp10 = load i32, i32* @i, align 4
call void @fn()
%a1 = load volatile i1, i1* @v
br i1 %a1, label %do.body, label %do.end
do.end:
%tmp20 = load i32, i32* getelementptr inbounds ([573 x i32], [573 x i32]* @j,
i32 0, i32 1), align 4
ret i32 %tmp20
}
declare void @fn()
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