6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-24 08:24:33 +00:00
Code Issues Projects Releases Wiki Activity

[DAGCombiner] Added BSWAP vector constant folding support.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239675 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim
2015-06-13 14:08:15 +00:00
parent 6b520d01a2
commit d8b27b1cb1
3 changed files with 113 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -255,6 +255,7 @@ namespace {
SDValue visitSRA(SDNode *N);
SDValue visitSRL(SDNode *N);
SDValue visitRotate(SDNode *N);
SDValue visitBSWAP(SDNode *N);
SDValue visitCTLZ(SDNode *N);
SDValue visitCTLZ_ZERO_UNDEF(SDNode *N);
SDValue visitCTTZ(SDNode *N);
@ -1335,6 +1336,7 @@ SDValue DAGCombiner::visit(SDNode *N) {
case ISD::SRL: return visitSRL(N);
case ISD::ROTR:
case ISD::ROTL: return visitRotate(N);
case ISD::BSWAP: return visitBSWAP(N);
case ISD::CTLZ: return visitCTLZ(N);
case ISD::CTLZ_ZERO_UNDEF: return visitCTLZ_ZERO_UNDEF(N);
case ISD::CTTZ: return visitCTTZ(N);
@ -4764,6 +4766,16 @@ SDValue DAGCombiner::visitSRL(SDNode *N) {
return SDValue();
}
SDValue DAGCombiner::visitBSWAP(SDNode *N) {
SDValue N0 = N->getOperand(0);
EVT VT = N->getValueType(0);
// fold (bswap c1) -> c2
if (isConstantIntBuildVectorOrConstantInt(N0))
return DAG.getNode(ISD::BSWAP, SDLoc(N), VT, N0);
return SDValue();
}
SDValue DAGCombiner::visitCTLZ(SDNode *N) {
SDValue N0 = N->getOperand(0);
EVT VT = N->getValueType(0);