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Use new PPC-specific nodes to represent shifts which require the 6-bit

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amount handling that PPC provides.  These are generated by the lowering code
and prevents the dag combiner from assuming (rightfully) that the shifts
don't only look at 5 bits.  This fixes a miscompilation of crafty with
the new front-end.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24615 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-12-06 02:10:38 +00:00
parent eda80a0dec
commit 4172b10ca1
3 changed files with 40 additions and 15 deletions
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24
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -279,14 +279,14 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
DAG.getConstant(32, MVT::i32), Amt);
SDOperand Tmp2 = DAG.getNode(ISD::SHL, MVT::i32, Hi, Amt);
SDOperand Tmp3 = DAG.getNode(ISD::SRL, MVT::i32, Lo, Tmp1);
SDOperand Tmp2 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
DAG.getConstant(-32U, MVT::i32));
SDOperand Tmp6 = DAG.getNode(ISD::SHL, MVT::i32, Lo, Tmp5);
SDOperand Tmp6 = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Tmp5);
SDOperand OutHi = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
SDOperand OutLo = DAG.getNode(ISD::SHL, MVT::i32, Lo, Amt);
SDOperand OutLo = DAG.getNode(PPCISD::SHL, MVT::i32, Lo, Amt);
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
}
case ISD::SRL: {
@ -305,14 +305,14 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
DAG.getConstant(32, MVT::i32), Amt);
SDOperand Tmp2 = DAG.getNode(ISD::SRL, MVT::i32, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(ISD::SHL, MVT::i32, Hi, Tmp1);
SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
DAG.getConstant(-32U, MVT::i32));
SDOperand Tmp6 = DAG.getNode(ISD::SRL, MVT::i32, Hi, Tmp5);
SDOperand Tmp6 = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Tmp5);
SDOperand OutLo = DAG.getNode(ISD::OR, MVT::i32, Tmp4, Tmp6);
SDOperand OutHi = DAG.getNode(ISD::SRL, MVT::i32, Hi, Amt);
SDOperand OutHi = DAG.getNode(PPCISD::SRL, MVT::i32, Hi, Amt);
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);
}
case ISD::SRA: {
@ -330,13 +330,13 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
SDOperand Tmp1 = DAG.getNode(ISD::SUB, MVT::i32,
DAG.getConstant(32, MVT::i32), Amt);
SDOperand Tmp2 = DAG.getNode(ISD::SRL, MVT::i32, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(ISD::SHL, MVT::i32, Hi, Tmp1);
SDOperand Tmp2 = DAG.getNode(PPCISD::SRL, MVT::i32, Lo, Amt);
SDOperand Tmp3 = DAG.getNode(PPCISD::SHL, MVT::i32, Hi, Tmp1);
SDOperand Tmp4 = DAG.getNode(ISD::OR , MVT::i32, Tmp2, Tmp3);
SDOperand Tmp5 = DAG.getNode(ISD::ADD, MVT::i32, Amt,
DAG.getConstant(-32U, MVT::i32));
SDOperand Tmp6 = DAG.getNode(ISD::SRA, MVT::i32, Hi, Tmp5);
SDOperand OutHi = DAG.getNode(ISD::SRA, MVT::i32, Hi, Amt);
SDOperand Tmp6 = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Tmp5);
SDOperand OutHi = DAG.getNode(PPCISD::SRA, MVT::i32, Hi, Amt);
SDOperand OutLo = DAG.getSelectCC(Tmp5, DAG.getConstant(0, MVT::i32),
Tmp4, Tmp6, ISD::SETLE);
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, OutLo, OutHi);

6
lib/Target/PowerPC/PPCISelLowering.h
View File

@ -49,6 +49,12 @@ namespace llvm {
/// GlobalBaseReg - On Darwin, this node represents the result of the mflr
/// at function entry, used for PIC code.
GlobalBaseReg,
/// These nodes represent the 32-bit PPC shifts that operate on 6-bit
/// shift amounts. These nodes are generated by the multi-precision shift
/// code.
SRL, SRA, SHL,
};
}

25
lib/Target/PowerPC/PPCInstrInfo.td
View File

@ -30,6 +30,15 @@ def PPCfsel : SDNode<"PPCISD::FSEL",
def PPChi : SDNode<"PPCISD::Hi", SDTIntBinOp, []>;
def PPClo : SDNode<"PPCISD::Lo", SDTIntBinOp, []>;
// These nodes represent the 32-bit PPC shifts that operate on 6-bit shift
// amounts. These nodes are generated by the multi-precision shift code.
def SDT_PPCShiftOp : SDTypeProfile<1, 2, [ // PPCshl, PPCsra, PPCsrl
SDTCisVT<0, i32>, SDTCisVT<1, i32>, SDTCisVT<2, i32>
]>;
def PPCsrl : SDNode<"PPCISD::SRL" , SDT_PPCShiftOp>;
def PPCsra : SDNode<"PPCISD::SRA" , SDT_PPCShiftOp>;
def PPCshl : SDNode<"PPCISD::SHL" , SDT_PPCShiftOp>;
// These are target-independent nodes, but have target-specific formats.
def SDT_PPCCallSeq : SDTypeProfile<0, 1, [ SDTCisVT<0, i32> ]>;
def callseq_start : SDNode<"ISD::CALLSEQ_START", SDT_PPCCallSeq,[SDNPHasChain]>;
@ -430,19 +439,19 @@ def SLD : XForm_6<31, 27, (ops G8RC:$rA, G8RC:$rS, G8RC:$rB),
[(set G8RC:$rA, (shl G8RC:$rS, G8RC:$rB))]>, isPPC64;
def SLW : XForm_6<31, 24, (ops GPRC:$rA, GPRC:$rS, GPRC:$rB),
"slw $rA, $rS, $rB", IntGeneral,
[(set GPRC:$rA, (shl GPRC:$rS, GPRC:$rB))]>;
[(set GPRC:$rA, (PPCshl GPRC:$rS, GPRC:$rB))]>;
def SRD : XForm_6<31, 539, (ops G8RC:$rA, G8RC:$rS, G8RC:$rB),
"srd $rA, $rS, $rB", IntRotateD,
[(set G8RC:$rA, (srl G8RC:$rS, G8RC:$rB))]>, isPPC64;
def SRW : XForm_6<31, 536, (ops GPRC:$rA, GPRC:$rS, GPRC:$rB),
"srw $rA, $rS, $rB", IntGeneral,
[(set GPRC:$rA, (srl GPRC:$rS, GPRC:$rB))]>;
[(set GPRC:$rA, (PPCsrl GPRC:$rS, GPRC:$rB))]>;
def SRAD : XForm_6<31, 794, (ops G8RC:$rA, G8RC:$rS, G8RC:$rB),
"srad $rA, $rS, $rB", IntRotateD,
[(set G8RC:$rA, (sra G8RC:$rS, G8RC:$rB))]>, isPPC64;
def SRAW : XForm_6<31, 792, (ops GPRC:$rA, GPRC:$rS, GPRC:$rB),
"sraw $rA, $rS, $rB", IntShift,
[(set GPRC:$rA, (sra GPRC:$rS, GPRC:$rB))]>;
[(set GPRC:$rA, (PPCsra GPRC:$rS, GPRC:$rB))]>;
let isStore = 1 in {
def STBX : XForm_8<31, 215, (ops GPRC:$rS, GPRC:$rA, GPRC:$rB),
"stbx $rS, $rA, $rB", LdStGeneral>;
@ -891,6 +900,16 @@ def : Pat<(PPClo tglobaladdr:$in, (i32 0)), (LI tglobaladdr:$in)>;
def : Pat<(add GPRC:$in, (PPChi tglobaladdr:$g, 0)),
(ADDIS GPRC:$in, tglobaladdr:$g)>;
// Standard shifts. These are represented separately from the real shifts above
// so that we can distinguish between shifts that allow 5-bit and 6-bit shift
// amounts.
def : Pat<(sra GPRC:$rS, GPRC:$rB),
(SRAW GPRC:$rS, GPRC:$rB)>;
def : Pat<(srl GPRC:$rS, GPRC:$rB),
(SRW GPRC:$rS, GPRC:$rB)>;
def : Pat<(shl GPRC:$rS, GPRC:$rB),
(SLW GPRC:$rS, GPRC:$rB)>;
// Same as above, but using a temporary. FIXME: implement temporaries :)
/*
def : Pattern<(xor GPRC:$in, imm:$imm),