34 lines
907 B
LLVM
34 lines
907 B
LLVM
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; RUN: opt < %s -gvn -enable-pre -S | FileCheck %s
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; RUN: opt < %s -passes="gvn<pre>" -enable-pre=false -S | FileCheck %s
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@H = common global i32 0 ; <i32*> [#uses=2]
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@G = common global i32 0 ; <i32*> [#uses=1]
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define i32 @test() nounwind {
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entry:
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%0 = load i32, i32* @H, align 4 ; <i32> [#uses=2]
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%1 = call i32 (...) @foo() nounwind ; <i32> [#uses=1]
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%2 = icmp ne i32 %1, 0 ; <i1> [#uses=1]
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br i1 %2, label %bb, label %bb1
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bb: ; preds = %entry
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%3 = add i32 %0, 42 ; <i32> [#uses=1]
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; CHECK: %.pre = add i32 %0, 42
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store i32 %3, i32* @G, align 4
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br label %bb1
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bb1: ; preds = %bb, %entry
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%4 = add i32 %0, 42 ; <i32> [#uses=1]
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store i32 %4, i32* @H, align 4
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br label %return
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; CHECK: %.pre-phi = phi i32 [ %.pre, %entry.bb1_crit_edge ], [ %3, %bb ]
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; CHECK-NEXT: store i32 %.pre-phi, i32* @H, align 4
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; CHECK-NEXT: ret i32 0
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return: ; preds = %bb1
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ret i32 0
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}
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declare i32 @foo(...)
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