derek.holloway
7502bf64a4
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55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
; RUN: opt < %s -aa-pipeline=globals-aa -passes='require<globals-aa>,gvn' -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@a = internal global ptr null, align 8
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@b = global ptr @a, align 8
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@c = global ptr @a, align 8
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@d = common global i32 0, align 4
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; Make sure we globals-aa doesn't get confused and allow hoisting
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; the load from @a out of the loop.
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; CHECK-LABEL: define i32 @main()
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; CHECK: for.body:
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; CHECK-NEXT: %2 = load ptr, ptr @b, align 8
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; CHECK-NEXT: store ptr @d, ptr %2, align 8
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; CHECK-NEXT: %3 = load ptr, ptr @a, align 8
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; CHECK-NEXT: %cmp1 = icmp ne ptr %3, @d
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; CHECK-NEXT: br i1 %cmp1, label %if.then, label %if.end
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define i32 @main() {
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entry:
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%0 = load i32, ptr @d, align 4
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br label %for.cond
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for.cond: ; preds = %if.end, %entry
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%1 = phi i32 [ %inc, %if.end ], [ %0, %entry ]
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%cmp = icmp slt i32 %1, 1
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%2 = load ptr, ptr @b, align 8
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store ptr @d, ptr %2, align 8
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%3 = load ptr, ptr @a, align 8
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%cmp1 = icmp ne ptr %3, @d
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br i1 %cmp1, label %if.then, label %if.end
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if.then: ; preds = %for.body
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br label %return
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if.end: ; preds = %for.body
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%4 = load i32, ptr @d, align 4
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%inc = add nsw i32 %4, 1
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store i32 %inc, ptr @d, align 4
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br label %for.cond
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for.end: ; preds = %for.cond
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br label %return
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return: ; preds = %for.end, %if.then
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%retval.0 = phi i32 [ 1, %if.then ], [ 0, %for.end ]
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ret i32 %retval.0
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}
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