6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-07-22 09:29:31 +00:00
Code Issues Projects Releases Wiki Activity

[x86] Replace some duplicated logic reasoning about whether particular

Browse Source 
vector lanes can be modeled as zero with a call to the new function that
computes a bit-vector representing that information.

No functionality changed here, but will allow doing more clever things
with the zero-test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218174 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-09-20 02:44:21 +00:00
parent c7210b3f0b
commit 8924ed3db4
1 changed files with 6 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
lib/Target/X86/X86ISelLowering.cpp
View File

@ -7556,10 +7556,16 @@ static SDValue lowerVectorShuffleAsZeroOrAnyExtend(
static SDValue lowerIntegerElementInsertionVectorShuffle(
MVT VT, SDLoc DL, SDValue V1, SDValue V2, ArrayRef<int> Mask,
const X86Subtarget *Subtarget, SelectionDAG &DAG) {
SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
int V2Index = std::find_if(Mask.begin(), Mask.end(),
[&Mask](int M) { return M >= (int)Mask.size(); }) -
Mask.begin();
for (int i = 0, Size = Mask.size(); i < Size; ++i)
if (i != V2Index && !Zeroable[i])
return SDValue(); // Not inserting into a zero vector.
// Check for a single input from a SCALAR_TO_VECTOR node.
// FIXME: All of this should be canonicalized into INSERT_VECTOR_ELT and
// all the smarts here sunk into that routine. However, the current
@ -7572,19 +7578,6 @@ static SDValue lowerIntegerElementInsertionVectorShuffle(
SDValue V2S = V2.getOperand(Mask[V2Index] - Mask.size());
if (V1.getOpcode() == ISD::BUILD_VECTOR) {
for (int M : Mask) {
if (M < 0 || M >= (int)Mask.size())
continue;
SDValue Input = V1.getOperand(M);
if (Input.getOpcode() != ISD::UNDEF && !X86::isZeroNode(Input))
// A non-zero input!
return SDValue();
}
} else if (!ISD::isBuildVectorAllZeros(V1.getNode())) {
return SDValue();
}
// First, we need to zext the scalar if it is smaller than an i32.
MVT EltVT = VT.getVectorElementType();
assert(EltVT == V2S.getSimpleValueType() &&