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| author | Pete Cooper <peter_cooper@apple.com> | 2012-02-15 00:33:37 +0000 |
|---|---|---|
| committer | Pete Cooper <peter_cooper@apple.com> | 2012-02-15 00:33:37 +0000 |
| commit | 9989a63818581bcfeed730e42055af425fdf9353 (patch) | |
| tree | a146f356fdf42cba840a8126cb042ab03bd8eaac | |
| parent | 92fd01736484262fef049b7358366d8eab2f857e (diff) | |
Stop custom lowering forr x86 DEC64m from happening if the load in the lowered sequence has more than 1 user
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150537 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86ISelDAGToDAG.cpp | 1 | ||||
| -rw-r--r-- | test/CodeGen/X86/dec-eflags-lower.ll | 14 |
2 files changed, 15 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp index 709be5f853..16f9c46c68 100644 --- a/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -2379,6 +2379,7 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) { StoredVal->getOpcode() != X86ISD::DEC || StoredVal.getResNo() != 0 || !StoredVal.getNode()->hasNUsesOfValue(1, 0) || + !Chain.getNode()->hasNUsesOfValue(1, 0) || StoredVal->getOperand(0).getNode() != Chain.getNode()) break; diff --git a/test/CodeGen/X86/dec-eflags-lower.ll b/test/CodeGen/X86/dec-eflags-lower.ll index 841a4615f5..190819f4cf 100644 --- a/test/CodeGen/X86/dec-eflags-lower.ll +++ b/test/CodeGen/X86/dec-eflags-lower.ll @@ -43,6 +43,20 @@ store i32 %lor.ext.i, i32* @a, align 4, !tbaa !3 ret i32 0 } +; CHECK: test2 +define i32 @test2() nounwind uwtable ssp { +entry: +; CHECK-NOT: decq ({{.*}}) +%0 = load i64* @c, align 8, !tbaa !0 +%dec.i = add nsw i64 %0, -1 +store i64 %dec.i, i64* @c, align 8, !tbaa !0 +%tobool.i = icmp ne i64 %0, 0 +%lor.ext.i = zext i1 %tobool.i to i32 +store i32 %lor.ext.i, i32* @a, align 4, !tbaa !3 +%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([5 x i8]* @.str, i64 0, i64 0), i64 %dec.i) nounwind +ret i32 0 +} + declare i32 @printf(i8* nocapture, ...) nounwind declare void @free(i8* nocapture) nounwind |