Changes in directory llvm/lib/Target/PowerPC:
PPCISelLowering.cpp updated: 1.155 -> 1.156
---
Log message:
Pull some code out into a helper function.
Effeciently codegen even splats in the range [-32,30].
This allows us to codegen <30,30,30,30> as:
vspltisw v0, 15
vadduwm v2, v0, v0
instead of as a cp load.
---
Diffs of the changes: (+26 -16)
PPCISelLowering.cpp | 42 ++++++++++++++++++++++++++----------------
1 files changed, 26 insertions(+), 16 deletions(-)
Index: llvm/lib/Target/PowerPC/PPCISelLowering.cpp
diff -u llvm/lib/Target/PowerPC/PPCISelLowering.cpp:1.155
llvm/lib/Target/PowerPC/PPCISelLowering.cpp:1.156
--- llvm/lib/Target/PowerPC/PPCISelLowering.cpp:1.155 Mon Apr 17 00:28:54 2006
+++ llvm/lib/Target/PowerPC/PPCISelLowering.cpp Mon Apr 17 01:00:21 2006
@@ -1041,6 +1041,23 @@
return true;
}
+/// BuildSplatI - Build a canonical splati of Val with an element size of
+/// SplatSize. Cast the result to VT.
+static SDOperand BuildSplatI(int Val, unsigned SplatSize, MVT::ValueType VT,
+ SelectionDAG &DAG) {
+ assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
+ static const MVT::ValueType VTys[] = { // canonical VT to use for each size.
+ MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
+ };
+ MVT::ValueType CanonicalVT = VTys[SplatSize-1];
+
+ // Build a canonical splat for this value.
+ SDOperand Elt = DAG.getConstant(Val, MVT::getVectorBaseType(CanonicalVT));
+ std::vector<SDOperand> Ops(MVT::getVectorNumElements(CanonicalVT), Elt);
+ SDOperand Res = DAG.getNode(ISD::BUILD_VECTOR, CanonicalVT, Ops);
+ return DAG.getNode(ISD::BIT_CONVERT, VT, Res);
+}
+
// If this is a case we can't handle, return null and let the default
// expansion code take care of it. If we CAN select this case, and if it
// selects to a single instruction, return Op. Otherwise, if we can codegen
@@ -1079,23 +1096,16 @@
// If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
int32_t SextVal= int32_t(SplatBits << (32-8*SplatSize)) >>
(32-8*SplatSize);
- if (SextVal >= -16 && SextVal <= 15) {
- const MVT::ValueType VTys[] = { // canonical VT to use for each size.
- MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
- };
- MVT::ValueType CanonicalVT = VTys[SplatSize-1];
-
- // If this is a non-canonical splat for this value,
- if (Op.getValueType() != CanonicalVT || HasAnyUndefs) {
- SDOperand Elt = DAG.getConstant(SplatBits,
- MVT::getVectorBaseType(CanonicalVT));
- std::vector<SDOperand> Ops(MVT::getVectorNumElements(CanonicalVT),
Elt);
- SDOperand Res = DAG.getNode(ISD::BUILD_VECTOR, CanonicalVT, Ops);
- Op = DAG.getNode(ISD::BIT_CONVERT, Op.getValueType(), Res);
- }
- return Op;
- }
+ if (SextVal >= -16 && SextVal <= 15)
+ return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG);
+ // If this value is in the range [-32,30] and is even, use:
+ // tmp = VSPLTI[bhw], result = add tmp, tmp
+ if (SextVal >= -32 && SextVal <= 30 && (SextVal & 1) == 0) {
+ Op = BuildSplatI(SextVal >> 1, SplatSize, Op.getValueType(), DAG);
+ return DAG.getNode(ISD::ADD, Op.getValueType(), Op, Op);
+ }
+
// If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is
// 0x7FFF_FFFF x 4, turn it into not(0x8000_0000). These are important
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