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