derek.holloway
7502bf64a4
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52 lines
1.5 KiB
LLVM
52 lines
1.5 KiB
LLVM
; RUN: opt -S -passes=gvn-hoist < %s | FileCheck %s
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; Check that the stores are not hoisted: it is invalid to hoist stores if they
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; are not executed on all paths. In this testcase, there are paths in the loop
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; that do not execute the stores.
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; CHECK-LABEL: define i32 @main
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; CHECK: store
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; CHECK: store
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; CHECK: store
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@a = global i32 0, align 4
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define i32 @main() {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc5, %entry
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%0 = load i32, ptr @a, align 4
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%cmp = icmp slt i32 %0, 1
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br i1 %cmp, label %for.cond1, label %for.end7
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for.cond1: ; preds = %for.cond, %for.inc
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%1 = load i32, ptr @a, align 4
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%cmp2 = icmp slt i32 %1, 1
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br i1 %cmp2, label %for.body3, label %for.inc5
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for.body3: ; preds = %for.cond1
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%tobool = icmp ne i32 %1, 0
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br i1 %tobool, label %if.then, label %for.inc
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if.then: ; preds = %for.body3
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%inc = add nsw i32 %1, 1
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store i32 %inc, ptr @a, align 4
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br label %for.inc
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for.inc: ; preds = %for.body3, %if.then
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%2 = load i32, ptr @a, align 4
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%inc4 = add nsw i32 %2, 1
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store i32 %inc4, ptr @a, align 4
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br label %for.cond1
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for.inc5: ; preds = %for.cond1
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%inc6 = add nsw i32 %1, 1
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store i32 %inc6, ptr @a, align 4
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br label %for.cond
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for.end7: ; preds = %for.cond
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ret i32 %0
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}
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