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Add support for lowering 128-bit shifts on ppc64.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48029 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-03-07 20:36:53 +00:00
parent 8419dd6aa6
commit 9ed06db5c8
2 changed files with 71 additions and 41 deletions
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98
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@@ -233,6 +233,10 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
addRegisterClass(MVT::i64, PPC::G8RCRegisterClass); addRegisterClass(MVT::i64, PPC::G8RCRegisterClass);
// BUILD_PAIR can't be handled natively, and should be expanded to shl/or // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand); setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
// 64-bit PowerPC wants to expand i128 shifts itself.
setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
} else { } else {
// 32-bit PowerPC wants to expand i64 shifts itself. // 32-bit PowerPC wants to expand i64 shifts itself.
setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom); setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
@@ -2416,77 +2420,89 @@ SDOperand PPCTargetLowering::LowerFLT_ROUNDS_(SDOperand Op, SelectionDAG &DAG) {
} }
SDOperand PPCTargetLowering::LowerSHL_PARTS(SDOperand Op, SelectionDAG &DAG) { SDOperand PPCTargetLowering::LowerSHL_PARTS(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 && MVT::ValueType VT = Op.getValueType();
Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SHL!"); unsigned BitWidth = MVT::getSizeInBits(VT);
assert(Op.getNumOperands() == 3 &&
VT == Op.getOperand(1).getValueType() &&
"Unexpected SHL!");
// Expand into a bunch of logical ops. Note that these ops // Expand into a bunch of logical ops. Note that these ops
// depend on the PPC behavior for oversized shift amounts. // depend on the PPC behavior for oversized shift amounts.
SDOperand Lo = Op.getOperand(0); SDOperand Lo = Op.getOperand(0);
SDOperand Hi = Op.getOperand(1); SDOperand Hi = Op.getOperand(1);
SDOperand Amt = Op.getOperand(2); SDOperand Amt = Op.getOperand(2);
MVT::ValueType AmtVT = Amt.getValueType();
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32, SDOperand Tmp1 = DAG.getNode(ISD::SUB, AmtVT,
DAG.getConstant(32, MVT::i32), Amt); DAG.getConstant(BitWidth, AmtVT), Amt);
SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Amt); SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, VT, Hi, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Tmp1); SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, VT, Lo, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3); SDOperand Tmp4 = DAG.getNode(ISD::OR , VT, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt, SDOperand Tmp5 = DAG.getNode(ISD::ADD, AmtVT, Amt,
DAG.getConstant(-32U, MVT::i32)); DAG.getConstant(-BitWidth, AmtVT));
SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Tmp5); SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, VT, Lo, Tmp5);
SDOperand OutHi = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6); SDOperand OutHi = DAG.getNode(ISD::OR, VT, Tmp4, Tmp6);
SDOperand OutLo = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Amt); SDOperand OutLo = DAG.getNode(PPCISD::SHL, VT, Lo, Amt);
SDOperand OutOps[] = { OutLo, OutHi }; SDOperand OutOps[] = { OutLo, OutHi };
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32), return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(VT, VT),
OutOps, 2); OutOps, 2);
} }
SDOperand PPCTargetLowering::LowerSRL_PARTS(SDOperand Op, SelectionDAG &DAG) { SDOperand PPCTargetLowering::LowerSRL_PARTS(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 && MVT::ValueType VT = Op.getValueType();
Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRL!"); unsigned BitWidth = MVT::getSizeInBits(VT);
assert(Op.getNumOperands() == 3 &&
VT == Op.getOperand(1).getValueType() &&
"Unexpected SRL!");
// Otherwise, expand into a bunch of logical ops. Note that these ops // Expand into a bunch of logical ops. Note that these ops
// depend on the PPC behavior for oversized shift amounts. // depend on the PPC behavior for oversized shift amounts.
SDOperand Lo = Op.getOperand(0); SDOperand Lo = Op.getOperand(0);
SDOperand Hi = Op.getOperand(1); SDOperand Hi = Op.getOperand(1);
SDOperand Amt = Op.getOperand(2); SDOperand Amt = Op.getOperand(2);
MVT::ValueType AmtVT = Amt.getValueType();
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32, SDOperand Tmp1 = DAG.getNode(ISD::SUB, AmtVT,
DAG.getConstant(32, MVT::i32), Amt); DAG.getConstant(BitWidth, AmtVT), Amt);
SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt); SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, VT, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1); SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, VT, Hi, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3); SDOperand Tmp4 = DAG.getNode(ISD::OR , VT, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt, SDOperand Tmp5 = DAG.getNode(ISD::ADD, AmtVT, Amt,
DAG.getConstant(-32U, MVT::i32)); DAG.getConstant(-BitWidth, AmtVT));
SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Tmp5); SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, VT, Hi, Tmp5);
SDOperand OutLo = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6); SDOperand OutLo = DAG.getNode(ISD::OR, VT, Tmp4, Tmp6);
SDOperand OutHi = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Amt); SDOperand OutHi = DAG.getNode(PPCISD::SRL, VT, Hi, Amt);
SDOperand OutOps[] = { OutLo, OutHi }; SDOperand OutOps[] = { OutLo, OutHi };
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32), return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(VT, VT),
OutOps, 2); OutOps, 2);
} }
SDOperand PPCTargetLowering::LowerSRA_PARTS(SDOperand Op, SelectionDAG &DAG) { SDOperand PPCTargetLowering::LowerSRA_PARTS(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getNumOperands() == 3 && Op.getValueType() == MVT::i32 && MVT::ValueType VT = Op.getValueType();
Op.getOperand(1).getValueType() == MVT::i32 && "Unexpected SRA!"); unsigned BitWidth = MVT::getSizeInBits(VT);
assert(Op.getNumOperands() == 3 &&
VT == Op.getOperand(1).getValueType() &&
"Unexpected SRA!");
// Otherwise, expand into a bunch of logical ops, followed by a select_cc. // Expand into a bunch of logical ops, followed by a select_cc.
SDOperand Lo = Op.getOperand(0); SDOperand Lo = Op.getOperand(0);
SDOperand Hi = Op.getOperand(1); SDOperand Hi = Op.getOperand(1);
SDOperand Amt = Op.getOperand(2); SDOperand Amt = Op.getOperand(2);
MVT::ValueType AmtVT = Amt.getValueType();
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32, SDOperand Tmp1 = DAG.getNode(ISD::SUB, AmtVT,
DAG.getConstant(32, MVT::i32), Amt); DAG.getConstant(BitWidth, AmtVT), Amt);
SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt); SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, VT, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1); SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, VT, Hi, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3); SDOperand Tmp4 = DAG.getNode(ISD::OR , VT, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt, SDOperand Tmp5 = DAG.getNode(ISD::ADD, AmtVT, Amt,
DAG.getConstant(-32U, MVT::i32)); DAG.getConstant(-BitWidth, AmtVT));
SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Tmp5); SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, VT, Hi, Tmp5);
SDOperand OutHi = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Amt); SDOperand OutHi = DAG.getNode(PPCISD::SRA, VT, Hi, Amt);
SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, MVT::i32), SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, AmtVT),
Tmp4, Tmp6, ISD::SETLE); Tmp4, Tmp6, ISD::SETLE);
SDOperand OutOps[] = { OutLo, OutHi }; SDOperand OutOps[] = { OutLo, OutHi };
return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::i32, MVT::i32), return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(VT, VT),
OutOps, 2); OutOps, 2);
} }

14
test/CodeGen/PowerPC/shift128.ll Normal file
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@@ -0,0 +1,14 @@
; RUN: llvm-as < %s | llc -march=ppc64 | grep sld | count 5
define i128 @foo_lshr(i128 %x, i128 %y) {
%r = lshr i128 %x, %y
ret i128 %r
}
define i128 @foo_ashr(i128 %x, i128 %y) {
%r = ashr i128 %x, %y
ret i128 %r
}
define i128 @foo_shl(i128 %x, i128 %y) {
%r = shl i128 %x, %y
ret i128 %r
}