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Stop custom lowering forr x86 DEC64m from happening if the load in the lowered sequence has more than 1 user

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150537 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper 2012-02-15 00:33:37 +00:00
parent 92fd017364
commit 9989a63818
2 changed files with 15 additions and 0 deletions
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1
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -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;

14
test/CodeGen/X86/dec-eflags-lower.ll
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@ -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