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Add SPARC v9 support for select on 64-bit compares.

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This requires v9 cmov instructions using the %xcc flags instead of the
%icc flags.

Still missing:
- Select floats on %xcc flags.
- Select i64 on %fcc flags.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178737 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2013-04-04 03:08:00 +00:00
parent b8bfb62e85
commit 0e16488442
5 changed files with 57 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
lib/Target/Sparc/SparcISelLowering.cpp
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@@ -826,6 +826,7 @@ SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
if (Subtarget->is64Bit()) {
setOperationAction(ISD::BR_CC, MVT::i64, Custom);
setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
}
// FIXME: There are instructions available for ATOMIC_FENCE
@@ -900,6 +901,7 @@ const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const {
case SPISD::BRXCC: return "SPISD::BRXCC";
case SPISD::BRFCC: return "SPISD::BRFCC";
case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC";
case SPISD::SELECT_XCC: return "SPISD::SELECT_XCC";
case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC";
case SPISD::Hi: return "SPISD::Hi";
case SPISD::Lo: return "SPISD::Lo";
@@ -926,6 +928,7 @@ void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
switch (Op.getOpcode()) {
default: break;
case SPISD::SELECT_ICC:
case SPISD::SELECT_XCC:
case SPISD::SELECT_FCC:
DAG.ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
DAG.ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
@@ -946,7 +949,8 @@ static void LookThroughSetCC(SDValue &LHS, SDValue &RHS,
if (isa<ConstantSDNode>(RHS) &&
cast<ConstantSDNode>(RHS)->isNullValue() &&
CC == ISD::SETNE &&
((LHS.getOpcode() == SPISD::SELECT_ICC &&
(((LHS.getOpcode() == SPISD::SELECT_ICC ||
LHS.getOpcode() == SPISD::SELECT_XCC) &&
LHS.getOperand(3).getOpcode() == SPISD::CMPICC) ||
(LHS.getOpcode() == SPISD::SELECT_FCC &&
LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) &&
@@ -1064,12 +1068,13 @@ static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
LookThroughSetCC(LHS, RHS, CC, SPCC);
SDValue CompareFlag;
if (LHS.getValueType() == MVT::i32) {
if (LHS.getValueType().isInteger()) {
// subcc returns a value
EVT VTs[] = { LHS.getValueType(), MVT::Glue };
SDValue Ops[2] = { LHS, RHS };
CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1);
Opc = SPISD::SELECT_ICC;
Opc = LHS.getValueType() == MVT::i32 ?
SPISD::SELECT_ICC : SPISD::SELECT_XCC;
if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
} else {
CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Glue, LHS, RHS);