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rename FpGETRESULT32 -> FpGET_ST0_32 etc. Add support for

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isel'ing value preserving FP roundings from one fp stack reg to another
into a noop, instead of stack traffic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-03-09 07:05:32 +00:00
parent ce6e492997
commit 6fa2f9c636
5 changed files with 62 additions and 46 deletions
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10
lib/Target/X86/X86FloatingPoint.cpp
View File

@ -214,7 +214,7 @@ bool FPS::processBasicBlock(MachineFunction &MF, MachineBasicBlock &BB) {
MachineInstr *PrevMI = 0;
if (I != BB.begin())
PrevMI = prior(I);
PrevMI = prior(I);
++NumFP; // Keep track of # of pseudo instrs
DOUT << "\nFPInst:\t" << *MI;
@ -917,13 +917,13 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
MachineInstr *MI = I;
switch (MI->getOpcode()) {
default: assert(0 && "Unknown SpecialFP instruction!");
case X86::FpGETRESULT32: // Appears immediately after a call returning FP type!
case X86::FpGETRESULT64: // Appears immediately after a call returning FP type!
case X86::FpGETRESULT80:
case X86::FpGET_ST0_32:// Appears immediately after a call returning FP type!
case X86::FpGET_ST0_64:// Appears immediately after a call returning FP type!
case X86::FpGET_ST0_80:// Appears immediately after a call returning FP type!
assert(StackTop == 0 && "Stack should be empty after a call!");
pushReg(getFPReg(MI->getOperand(0)));
break;
case X86::FpGETRESULT80x2:
case X86::FpGET_ST0_ST1:
assert(StackTop == 0 && "Stack should be empty after a call!");
pushReg(getFPReg(MI->getOperand(0)));
pushReg(getFPReg(MI->getOperand(1)));

17
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -486,10 +486,15 @@ void X86DAGToDAGISel::PreprocessForFPConvert(SelectionDAG &DAG) {
if (SrcIsSSE && DstIsSSE)
continue;
// If this is an FPStack extension (but not a truncation), it is a noop.
if (!SrcIsSSE && !DstIsSSE && N->getOpcode() == ISD::FP_EXTEND)
continue;
if (!SrcIsSSE && !DstIsSSE) {
// If this is an FPStack extension, it is a noop.
if (N->getOpcode() == ISD::FP_EXTEND)
continue;
// If this is a value-preserving FPStack truncation, it is a noop.
if (N->getConstantOperandVal(1))
continue;
}
// Here we could have an FP stack truncation or an FPStack <-> SSE convert.
// FPStack has extload and truncstore. SSE can fold direct loads into other
// operations. Based on this, decide what we want to do.
@ -1150,7 +1155,7 @@ SDNode *X86DAGToDAGISel::Select(SDOperand N) {
case X86ISD::GlobalBaseReg:
return getGlobalBaseReg();
case X86ISD::FP_GET_RESULT2: {
case X86ISD::FP_GET_ST0_ST1: {
SDOperand Chain = N.getOperand(0);
SDOperand InFlag = N.getOperand(1);
AddToISelQueue(Chain);
@ -1161,7 +1166,7 @@ SDNode *X86DAGToDAGISel::Select(SDOperand N) {
Tys.push_back(MVT::Other);
Tys.push_back(MVT::Flag);
SDOperand Ops[] = { Chain, InFlag };
SDNode *ResNode = CurDAG->getTargetNode(X86::FpGETRESULT80x2, Tys,
SDNode *ResNode = CurDAG->getTargetNode(X86::FpGET_ST0_ST1, Tys,
Ops, 2);
Chain = SDOperand(ResNode, 2);
InFlag = SDOperand(ResNode, 3);

9
lib/Target/X86/X86ISelLowering.cpp
View File

@ -917,9 +917,8 @@ LowerCallResult(SDOperand Chain, SDOperand InFlag, SDNode *TheCall,
if (isScalarFPTypeInSSEReg(GetResultTy))
GetResultTy = MVT::f80;
SDVTList Tys = DAG.getVTList(GetResultTy, MVT::Other, MVT::Flag);
SDOperand GROps[] = { Chain, InFlag };
SDOperand RetVal = DAG.getNode(X86ISD::FP_GET_RESULT, Tys, GROps, 2);
SDOperand RetVal = DAG.getNode(X86ISD::FP_GET_ST0, Tys, GROps, 2);
Chain = RetVal.getValue(1);
InFlag = RetVal.getValue(2);
@ -969,7 +968,7 @@ LowerCallResultToTwoX87Regs(SDOperand Chain, SDOperand InFlag,
const MVT::ValueType VTs[] = { MVT::f80, MVT::f80, MVT::Other, MVT::Flag };
SDVTList Tys = DAG.getVTList(VTs, 4);
SDOperand Ops[] = { Chain, InFlag };
SDOperand RetVal = DAG.getNode(X86ISD::FP_GET_RESULT2, Tys, Ops, 2);
SDOperand RetVal = DAG.getNode(X86ISD::FP_GET_ST0_ST1, Tys, Ops, 2);
Chain = RetVal.getValue(2);
SDOperand FIN = TheCall->getOperand(5);
Chain = DAG.getStore(Chain, RetVal.getValue(1), FIN, NULL, 0);
@ -5564,8 +5563,8 @@ const char *X86TargetLowering::getTargetNodeName(unsigned Opcode) const {
case X86ISD::FP_TO_INT64_IN_MEM: return "X86ISD::FP_TO_INT64_IN_MEM";
case X86ISD::FLD: return "X86ISD::FLD";
case X86ISD::FST: return "X86ISD::FST";
case X86ISD::FP_GET_RESULT: return "X86ISD::FP_GET_RESULT";
case X86ISD::FP_GET_RESULT2: return "X86ISD::FP_GET_RESULT2";
case X86ISD::FP_GET_ST0: return "X86ISD::FP_GET_ST0";
case X86ISD::FP_GET_ST0_ST1: return "X86ISD::FP_GET_ST0_ST1";
case X86ISD::FP_SET_RESULT: return "X86ISD::FP_SET_RESULT";
case X86ISD::CALL: return "X86ISD::CALL";
case X86ISD::TAILCALL: return "X86ISD::TAILCALL";

8
lib/Target/X86/X86ISelLowering.h
View File

@ -84,14 +84,14 @@ namespace llvm {
/// as.
FST,
/// FP_GET_RESULT - This corresponds to FpGETRESULT pseudo instruction
/// FP_GET_ST0 - This corresponds to FpGET_ST0 pseudo instruction
/// which copies from ST(0) to the destination. It takes a chain and
/// writes a RFP result and a chain.
FP_GET_RESULT,
FP_GET_ST0,
/// FP_GET_RESULT2 - Same as FP_GET_RESULT except it copies two values
/// FP_GET_ST0_ST1 - Same as FP_GET_RESULT except it copies two values
/// ST(0) and ST(1).
FP_GET_RESULT2,
FP_GET_ST0_ST1,
/// FP_SET_RESULT - This corresponds to FpSETRESULT pseudo instruction
/// which copies the source operand to ST(0). It takes a chain+value and

64
lib/Target/X86/X86InstrFPStack.td
View File

@ -18,7 +18,8 @@
//===----------------------------------------------------------------------===//
def SDTX86FpGet : SDTypeProfile<1, 0, [SDTCisFP<0>]>;
def SDTX86FpGet2 : SDTypeProfile<2, 0, [SDTCisFP<0>, SDTCisSameAs<0, 1>]>;
def SDTX86FpGet2 : SDTypeProfile<2, 0, [SDTCisVT<0, f80>,
SDTCisVT<1, f80>]>;
def SDTX86FpSet : SDTypeProfile<0, 1, [SDTCisFP<0>]>;
def SDTX86Fld : SDTypeProfile<1, 2, [SDTCisFP<0>,
SDTCisPtrTy<1>,
@ -32,9 +33,7 @@ def SDTX86FpToIMem : SDTypeProfile<0, 2, [SDTCisFP<0>, SDTCisPtrTy<1>]>;
def SDTX86CwdStore : SDTypeProfile<0, 1, [SDTCisPtrTy<0>]>;
def X86fpget : SDNode<"X86ISD::FP_GET_RESULT", SDTX86FpGet,
[SDNPHasChain, SDNPInFlag, SDNPOutFlag]>;
def X86fpget2 : SDNode<"X86ISD::FP_GET_RESULT2", SDTX86FpGet2,
def X86fpget_st0 : SDNode<"X86ISD::FP_GET_ST0", SDTX86FpGet,
[SDNPHasChain, SDNPInFlag, SDNPOutFlag]>;
def X86fpset : SDNode<"X86ISD::FP_SET_RESULT", SDTX86FpSet,
[SDNPHasChain, SDNPOutFlag]>;
@ -139,17 +138,15 @@ let isTerminator = 1 in
// encoding and asm printing info).
// Pseudo Instructions for FP stack return values.
def FpGETRESULT32 : FpI_<(outs RFP32:$dst), (ins), SpecialFP,
[(set RFP32:$dst, X86fpget)]>; // FPR = ST(0)
def FpGET_ST0_32 : FpI_<(outs RFP32:$dst), (ins), SpecialFP,
[(set RFP32:$dst, X86fpget_st0)]>; // FPR = ST(0)
def FpGET_ST0_64 : FpI_<(outs RFP64:$dst), (ins), SpecialFP,
[(set RFP64:$dst, X86fpget_st0)]>; // FPR = ST(0)
def FpGET_ST0_80 : FpI_<(outs RFP80:$dst), (ins), SpecialFP,
[(set RFP80:$dst, X86fpget_st0)]>; // FPR = ST(0)
def FpGETRESULT64 : FpI_<(outs RFP64:$dst), (ins), SpecialFP,
[(set RFP64:$dst, X86fpget)]>; // FPR = ST(0)
def FpGETRESULT80 : FpI_<(outs RFP80:$dst), (ins), SpecialFP,
[(set RFP80:$dst, X86fpget)]>; // FPR = ST(0)
def FpGETRESULT80x2 : FpI_<(outs RFP80:$dst1, RFP80:$dst2), (ins), SpecialFP,
[]>; // FPR = ST(0), FPR = ST(1)
def FpGET_ST0_ST1 : FpI_<(outs RFP80:$dst1, RFP80:$dst2), (ins), SpecialFP,
[]>; // FPR = ST(0), FPR = ST(1)
let Defs = [ST0] in {
@ -174,15 +171,15 @@ class FpIf64<dag outs, dag ins, FPFormat fp, list<dag> pattern> :
// Register copies. Just copies, the shortening ones do not truncate.
let neverHasSideEffects = 1 in {
def MOV_Fp3232 : FpIf32<(outs RFP32:$dst), (ins RFP32:$src), SpecialFP, []>;
def MOV_Fp3264 : FpIf32<(outs RFP64:$dst), (ins RFP32:$src), SpecialFP, []>;
def MOV_Fp6432 : FpIf32<(outs RFP32:$dst), (ins RFP64:$src), SpecialFP, []>;
def MOV_Fp6464 : FpIf64<(outs RFP64:$dst), (ins RFP64:$src), SpecialFP, []>;
def MOV_Fp8032 : FpIf32<(outs RFP32:$dst), (ins RFP80:$src), SpecialFP, []>;
def MOV_Fp3280 : FpIf32<(outs RFP80:$dst), (ins RFP32:$src), SpecialFP, []>;
def MOV_Fp8064 : FpIf64<(outs RFP64:$dst), (ins RFP80:$src), SpecialFP, []>;
def MOV_Fp6480 : FpIf64<(outs RFP80:$dst), (ins RFP64:$src), SpecialFP, []>;
def MOV_Fp8080 : FpI_<(outs RFP80:$dst), (ins RFP80:$src), SpecialFP, []>;
def MOV_Fp3232 : FpIf32<(outs RFP32:$dst), (ins RFP32:$src), SpecialFP, []>;
def MOV_Fp3264 : FpIf32<(outs RFP64:$dst), (ins RFP32:$src), SpecialFP, []>;
def MOV_Fp6432 : FpIf32<(outs RFP32:$dst), (ins RFP64:$src), SpecialFP, []>;
def MOV_Fp6464 : FpIf64<(outs RFP64:$dst), (ins RFP64:$src), SpecialFP, []>;
def MOV_Fp8032 : FpIf32<(outs RFP32:$dst), (ins RFP80:$src), SpecialFP, []>;
def MOV_Fp3280 : FpIf32<(outs RFP80:$dst), (ins RFP32:$src), SpecialFP, []>;
def MOV_Fp8064 : FpIf64<(outs RFP64:$dst), (ins RFP80:$src), SpecialFP, []>;
def MOV_Fp6480 : FpIf64<(outs RFP80:$dst), (ins RFP64:$src), SpecialFP, []>;
def MOV_Fp8080 : FpI_ <(outs RFP80:$dst), (ins RFP80:$src), SpecialFP, []>;
}
// Factoring for arithmetic.
@ -583,6 +580,21 @@ def : Pat<(f80 fpimmneg1), (CHS_Fp80 (LD_Fp180))>;
// Used to conv. i64 to f64 since there isn't a SSE version.
def : Pat<(X86fildflag addr:$src, i64), (ILD_Fp64m64 addr:$src)>;
def : Pat<(f64 (fextend RFP32:$src)), (MOV_Fp3264 RFP32:$src)>, Requires<[FPStackf32]>;
def : Pat<(f80 (fextend RFP32:$src)), (MOV_Fp3280 RFP32:$src)>, Requires<[FPStackf32]>;
def : Pat<(f80 (fextend RFP64:$src)), (MOV_Fp6480 RFP64:$src)>, Requires<[FPStackf64]>;
// FP extensions map onto simple pseudo-value conversions if they are to/from
// the FP stack.
def : Pat<(f64 (fextend RFP32:$src)), (MOV_Fp3264 RFP32:$src)>,
Requires<[FPStackf32]>;
def : Pat<(f80 (fextend RFP32:$src)), (MOV_Fp3280 RFP32:$src)>,
Requires<[FPStackf32]>;
def : Pat<(f80 (fextend RFP64:$src)), (MOV_Fp6480 RFP64:$src)>,
Requires<[FPStackf64]>;
// FP truncations map onto simple pseudo-value conversions if they are to/from
// the FP stack. We have validated that only value-preserving truncations make
// it through isel.
def : Pat<(f32 (fround RFP64:$src)), (MOV_Fp6432 RFP64:$src)>,
Requires<[FPStackf32]>;
def : Pat<(f32 (fround RFP80:$src)), (MOV_Fp8032 RFP80:$src)>,
Requires<[FPStackf32]>;
def : Pat<(f64 (fround RFP80:$src)), (MOV_Fp8064 RFP80:$src)>,
Requires<[FPStackf64]>;