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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3477 91177308-0d34-0410-b5e6-96231b3b80d8
49 lines
1.0 KiB
LLVM
49 lines
1.0 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: if as < %s | opt -instcombine -die | dis | grep phi
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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implementation
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int %test1(int %A, bool %b) {
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BB0: br bool %b, label %BB1, label %BB2
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BB1:
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%B = phi int [%A, %BB0] ; Combine away one argument PHI nodes
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ret int %B
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BB2:
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ret int %A
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}
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int %test2(int %A, bool %b) {
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BB0: br bool %b, label %BB1, label %BB2
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BB1:
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br label %BB2
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BB2:
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%B = phi int [%A, %BB0], [%A, %BB1] ; Combine away PHI nodes with same values
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ret int %B
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}
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int %test3(int %A, bool %b) {
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BB0: br label %Loop
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Loop:
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%B = phi int [%A, %BB0], [%B, %Loop] ; PHI has same value always.
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br bool %b, label %Loop, label %Exit
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Exit:
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ret int %B
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}
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int %test3(bool %b) {
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BB0: ret int 7 ; Loop is unreachable
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Loop:
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%B = phi int [%B, %L2], [%B, %Loop] ; PHI has same value always.
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br bool %b, label %L2, label %Loop
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L2:
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br label %Loop
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}
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