[llvm-commits] [llvm] r131800 - in /llvm/trunk: lib/CodeGen/SelectionDAG/DAGCombiner.cpp test/CodeGen/X86/umul-with-overflow.ll
Benjamin Kramer
benny.kra at googlemail.com
Sat May 21 11:31:55 PDT 2011
Author: d0k
Date: Sat May 21 13:31:55 2011
New Revision: 131800
URL: http://llvm.org/viewvc/llvm-project?rev=131800&view=rev
Log:
Implement mulo x, 2 -> addo x, x in DAGCombiner.
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
llvm/trunk/test/CodeGen/X86/umul-with-overflow.ll
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=131800&r1=131799&r2=131800&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Sat May 21 13:31:55 2011
@@ -165,6 +165,8 @@
SDValue visitMULHS(SDNode *N);
SDValue visitSMUL_LOHI(SDNode *N);
SDValue visitUMUL_LOHI(SDNode *N);
+ SDValue visitSMULO(SDNode *N);
+ SDValue visitUMULO(SDNode *N);
SDValue visitSDIVREM(SDNode *N);
SDValue visitUDIVREM(SDNode *N);
SDValue visitAND(SDNode *N);
@@ -1047,6 +1049,8 @@
case ISD::MULHS: return visitMULHS(N);
case ISD::SMUL_LOHI: return visitSMUL_LOHI(N);
case ISD::UMUL_LOHI: return visitUMUL_LOHI(N);
+ case ISD::SMULO: return visitSMULO(N);
+ case ISD::UMULO: return visitUMULO(N);
case ISD::SDIVREM: return visitSDIVREM(N);
case ISD::UDIVREM: return visitUDIVREM(N);
case ISD::AND: return visitAND(N);
@@ -2177,6 +2181,26 @@
return SDValue();
}
+SDValue DAGCombiner::visitSMULO(SDNode *N) {
+ // (smulo x, 2) -> (saddo x, x)
+ if (ConstantSDNode *C2 = dyn_cast<ConstantSDNode>(N->getOperand(1)))
+ if (C2->getAPIntValue() == 2)
+ return DAG.getNode(ISD::SADDO, N->getDebugLoc(), N->getVTList(),
+ N->getOperand(0), N->getOperand(0));
+
+ return SDValue();
+}
+
+SDValue DAGCombiner::visitUMULO(SDNode *N) {
+ // (umulo x, 2) -> (uaddo x, x)
+ if (ConstantSDNode *C2 = dyn_cast<ConstantSDNode>(N->getOperand(1)))
+ if (C2->getAPIntValue() == 2)
+ return DAG.getNode(ISD::UADDO, N->getDebugLoc(), N->getVTList(),
+ N->getOperand(0), N->getOperand(0));
+
+ return SDValue();
+}
+
SDValue DAGCombiner::visitSDIVREM(SDNode *N) {
SDValue Res = SimplifyNodeWithTwoResults(N, ISD::SDIV, ISD::SREM);
if (Res.getNode()) return Res;
Modified: llvm/trunk/test/CodeGen/X86/umul-with-overflow.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/umul-with-overflow.ll?rev=131800&r1=131799&r2=131800&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/umul-with-overflow.ll (original)
+++ llvm/trunk/test/CodeGen/X86/umul-with-overflow.ll Sat May 21 13:31:55 2011
@@ -12,3 +12,27 @@
; CHECK: movzbl %al, %eax
; CHECK: ret
}
+
+define i32 @test2(i32 %a, i32 %b) nounwind readnone {
+entry:
+ %tmp0 = add i32 %b, %a
+ %tmp1 = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %tmp0, i32 2)
+ %tmp2 = extractvalue { i32, i1 } %tmp1, 0
+ ret i32 %tmp2
+; CHECK: test2:
+; CHECK: addl
+; CHECK-NEXT: addl
+; CHECK-NEXT: ret
+}
+
+define i32 @test3(i32 %a, i32 %b) nounwind readnone {
+entry:
+ %tmp0 = add i32 %b, %a
+ %tmp1 = call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %tmp0, i32 4)
+ %tmp2 = extractvalue { i32, i1 } %tmp1, 0
+ ret i32 %tmp2
+; CHECK: test3:
+; CHECK: addl
+; CHECK: mull
+; CHECK-NEXT: ret
+}
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