32 lines
710 B
LLVM
32 lines
710 B
LLVM
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; RUN: opt < %s -gvn -S | FileCheck %s
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; This testcase tests insertion of no-cost phis. That is,
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; when the value is already available in every predecessor,
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; and we just need to insert a phi node to merge the available values.
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@c = global i32 0, align 4
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@d = global i32 0, align 4
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define i32 @mai(i32 %foo, i32 %a, i32 %b) {
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%1 = icmp ne i32 %foo, 0
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br i1 %1, label %bb1, label %bb2
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bb1:
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%2 = add nsw i32 %a, %b
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store i32 %2, i32* @c, align 4
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br label %mergeblock
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bb2:
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%3 = add nsw i32 %a, %b
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store i32 %3, i32* @d, align 4
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br label %mergeblock
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mergeblock:
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; CHECK: pre-phi = phi i32 [ %3, %bb2 ], [ %2, %bb1 ]
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; CHECK-NEXT: ret i32 %.pre-phi
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%4 = add nsw i32 %a, %b
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ret i32 %4
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}
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