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Generalize BuildVectorSDNode::isConstantSplat to use APInts and handle

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arbitrary vector sizes.  Add an optional MinSplatBits parameter to specify
a minimum for the splat element size.  Update the PPC target to use the
revised interface.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65899 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-03-02 23:24:16 +00:00
parent 52349a919b
commit 24e338e8a3
3 changed files with 69 additions and 90 deletions
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19
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -3167,13 +3167,16 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
assert(BVN != 0 && "Expected a BuildVectorSDNode in LowerBUILD_VECTOR");
// If this is a splat (repetition) of a value across the whole vector, return
// the smallest size that splats it. For example, "0x01010101010101..." is a
// splat of 0x01, 0x0101, and 0x01010101. We return SplatBits = 0x01 and
// SplatSize = 1 byte.
unsigned SplatBits, SplatUndef, SplatSize;
// Check if this is a splat of a constant value.
APInt APSplatBits, APSplatUndef;
unsigned SplatBitSize;
bool HasAnyUndefs;
if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatSize, HasAnyUndefs)) {
if (BVN->isConstantSplat(APSplatBits, APSplatUndef, SplatBitSize,
HasAnyUndefs) &&
SplatBitSize <= 32) {
unsigned SplatBits = APSplatBits.getZExtValue();
unsigned SplatUndef = APSplatUndef.getZExtValue();
unsigned SplatSize = SplatBitSize / 8;
// First, handle single instruction cases.
@ -3189,7 +3192,8 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
}
// 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);
int32_t SextVal= (int32_t(SplatBits << (32-SplatBitSize)) >>
(32-SplatBitSize));
if (SextVal >= -16 && SextVal <= 15)
return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG, dl);
@ -3221,7 +3225,6 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
}
// Check to see if this is a wide variety of vsplti*, binop self cases.
unsigned SplatBitSize = SplatSize*8;
static const signed char SplatCsts[] = {
-1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
-8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16