diff options
| author | Chris Lattner <sabre@nondot.org> | 2006-04-02 06:26:07 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-04-02 06:26:07 +0000 |
| commit | bbe77de450ef36b4f83cc3b57705a9758adbd925 (patch) | |
| tree | 9737710952e04c932121d61fc478565ee135fdc9 | |
| parent | 1b5232a93767eac1424c67fb86580deef97e21e0 (diff) | |
Inform the dag combiner that the predicate compares only return a low bit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27359 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.cpp | 35 | ||||
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.h | 5 |
2 files changed, 39 insertions, 1 deletions
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp index 03e63a2871..06096a74dc 100644 --- a/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/lib/Target/PowerPC/PPCISelLowering.cpp @@ -760,7 +760,7 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { return DAG.getNode(PPCISD::VPERM, V1.getValueType(), V1, V2, VPermMask); } case ISD::INTRINSIC_WO_CHAIN: { - unsigned IntNo=cast<ConstantSDNode>(Op.getOperand(0))->getValue(); + unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getValue(); // If this is a lowered altivec predicate compare, CompareOpc is set to the // opcode number of the comparison. @@ -1409,6 +1409,39 @@ SDOperand PPCTargetLowering::PerformDAGCombine(SDNode *N, return SDOperand(); } +void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op, + uint64_t Mask, + uint64_t &KnownZero, + uint64_t &KnownOne, + unsigned Depth) const { + KnownZero = 0; + KnownOne = 0; + switch (Op.getOpcode()) { + default: break; + case ISD::INTRINSIC_WO_CHAIN: { + switch (cast<ConstantSDNode>(Op.getOperand(0))->getValue()) { + default: break; + case Intrinsic::ppc_altivec_vcmpbfp_p: + case Intrinsic::ppc_altivec_vcmpeqfp_p: + case Intrinsic::ppc_altivec_vcmpequb_p: + case Intrinsic::ppc_altivec_vcmpequh_p: + case Intrinsic::ppc_altivec_vcmpequw_p: + case Intrinsic::ppc_altivec_vcmpgefp_p: + case Intrinsic::ppc_altivec_vcmpgtfp_p: + case Intrinsic::ppc_altivec_vcmpgtsb_p: + case Intrinsic::ppc_altivec_vcmpgtsh_p: + case Intrinsic::ppc_altivec_vcmpgtsw_p: + case Intrinsic::ppc_altivec_vcmpgtub_p: + case Intrinsic::ppc_altivec_vcmpgtuh_p: + case Intrinsic::ppc_altivec_vcmpgtuw_p: + KnownZero = ~1U; // All bits but the low one are known to be zero. + break; + } + } + } +} + + /// getConstraintType - Given a constraint letter, return the type of /// constraint it is for this target. PPCTargetLowering::ConstraintType diff --git a/lib/Target/PowerPC/PPCISelLowering.h b/lib/Target/PowerPC/PPCISelLowering.h index bc865c6cb4..2fe79ece8c 100644 --- a/lib/Target/PowerPC/PPCISelLowering.h +++ b/lib/Target/PowerPC/PPCISelLowering.h @@ -133,6 +133,11 @@ namespace llvm { virtual SDOperand PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const; + virtual void computeMaskedBitsForTargetNode(const SDOperand Op, + uint64_t Mask, + uint64_t &KnownZero, + uint64_t &KnownOne, + unsigned Depth = 0) const; /// LowerArguments - This hook must be implemented to indicate how we should /// lower the arguments for the specified function, into the specified DAG. virtual std::vector<SDOperand> |