mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-04-13 15:37:24 +00:00
kill SelectCALL() in the DAG isel, we handle this in lowering now, like
SPARCv8. (we copy sparcv8's workaround for tablegen not being nice about ISD::CALL/TAILCALL) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24941 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duraid Madina
parent
65f6ad804e
commit
a36153a961
@ -94,7 +94,6 @@ namespace {
|
||||
|
||||
private:
|
||||
SDOperand SelectDIV(SDOperand Op);
|
||||
SDOperand SelectCALL(SDOperand Op);
|
||||
};
|
||||
}
|
||||
|
||||
@ -327,191 +326,6 @@ SDOperand IA64DAGToDAGISel::SelectDIV(SDOperand Op) {
|
||||
return Result;
|
||||
}
|
||||
|
||||
|
||||
SDOperand IA64DAGToDAGISel::SelectCALL(SDOperand Op) {
|
||||
SDNode *N = Op.Val;
|
||||
SDOperand Chain = Select(N->getOperand(0));
|
||||
|
||||
unsigned CallOpcode;
|
||||
std::vector<SDOperand> CallOperands;
|
||||
|
||||
// save the current GP, SP and RP : FIXME: do we need to do all 3 always?
|
||||
SDOperand GPBeforeCall = CurDAG->getCopyFromReg(Chain, IA64::r1, MVT::i64);
|
||||
Chain = GPBeforeCall.getValue(1);
|
||||
SDOperand SPBeforeCall = CurDAG->getCopyFromReg(Chain, IA64::r12, MVT::i64);
|
||||
Chain = SPBeforeCall.getValue(1);
|
||||
SDOperand RPBeforeCall = CurDAG->getCopyFromReg(Chain, IA64::rp, MVT::i64);
|
||||
Chain = RPBeforeCall.getValue(1);
|
||||
|
||||
// if we can call directly, do so
|
||||
if (GlobalAddressSDNode *GASD =
|
||||
dyn_cast<GlobalAddressSDNode>(N->getOperand(1))) {
|
||||
CallOpcode = IA64::BRCALL_IPREL;
|
||||
CallOperands.push_back(CurDAG->getTargetGlobalAddress(GASD->getGlobal(),
|
||||
MVT::i64));
|
||||
} else if (ExternalSymbolSDNode *ESSDN = // FIXME: we currently NEED this
|
||||
// case for correctness, to avoid
|
||||
// "non-pic code with imm reloc.n
|
||||
// against dynamic symbol" errors
|
||||
dyn_cast<ExternalSymbolSDNode>(N->getOperand(1))) {
|
||||
CallOpcode = IA64::BRCALL_IPREL;
|
||||
CallOperands.push_back(N->getOperand(1));
|
||||
} else {
|
||||
// otherwise we need to load the function descriptor,
|
||||
// load the branch target (function)'s entry point and GP,
|
||||
// branch (call) then restore the GP
|
||||
|
||||
SDOperand FnDescriptor = Select(N->getOperand(1));
|
||||
|
||||
// load the branch target's entry point [mem] and
|
||||
// GP value [mem+8]
|
||||
SDOperand targetEntryPoint=CurDAG->getTargetNode(IA64::LD8, MVT::i64,
|
||||
FnDescriptor);
|
||||
Chain = targetEntryPoint.getValue(1);
|
||||
SDOperand targetGPAddr=CurDAG->getTargetNode(IA64::ADDS, MVT::i64,
|
||||
FnDescriptor, CurDAG->getConstant(8, MVT::i64));
|
||||
Chain = targetGPAddr.getValue(1);
|
||||
SDOperand targetGP=CurDAG->getTargetNode(IA64::LD8, MVT::i64,
|
||||
targetGPAddr);
|
||||
Chain = targetGP.getValue(1);
|
||||
|
||||
/* FIXME? (methcall still fails)
|
||||
SDOperand targetEntryPoint=CurDAG->getLoad(MVT::i64, Chain, FnDescriptor,
|
||||
CurDAG->getSrcValue(0));
|
||||
SDOperand targetGPAddr=CurDAG->getNode(ISD::ADD, MVT::i64, FnDescriptor,
|
||||
CurDAG->getConstant(8, MVT::i64));
|
||||
SDOperand targetGP=CurDAG->getLoad(MVT::i64, Chain, targetGPAddr,
|
||||
CurDAG->getSrcValue(0));
|
||||
*/
|
||||
|
||||
/* this is just the long way of writing the two lines below?
|
||||
// Copy the callee GP into r1
|
||||
SDOperand r1 = CurDAG->getRegister(IA64::r1, MVT::i64);
|
||||
Chain = CurDAG->getNode(ISD::CopyToReg, MVT::i64, Chain, r1,
|
||||
targetGP);
|
||||
|
||||
|
||||
// Copy the callee address into the b6 branch register
|
||||
SDOperand B6 = CurDAG->getRegister(IA64::B6, MVT::i64);
|
||||
Chain = CurDAG->getNode(ISD::CopyToReg, MVT::i64, Chain, B6,
|
||||
targetEntryPoint);
|
||||
*/
|
||||
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::r1, targetGP);
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::B6, targetEntryPoint);
|
||||
|
||||
CallOperands.push_back(CurDAG->getRegister(IA64::B6, MVT::i64));
|
||||
CallOpcode = IA64::BRCALL_INDIRECT;
|
||||
}
|
||||
|
||||
// see section 8.5.8 of "Itanium Software Conventions and
|
||||
// Runtime Architecture Guide to see some examples of what's going
|
||||
// on here. (in short: int args get mapped 1:1 'slot-wise' to out0->out7,
|
||||
// while FP args get mapped to F8->F15 as needed)
|
||||
|
||||
// TODO: support in-memory arguments
|
||||
|
||||
unsigned used_FPArgs=0; // how many FP args have been used so far?
|
||||
|
||||
unsigned intArgs[] = {IA64::out0, IA64::out1, IA64::out2, IA64::out3,
|
||||
IA64::out4, IA64::out5, IA64::out6, IA64::out7 };
|
||||
unsigned FPArgs[] = {IA64::F8, IA64::F9, IA64::F10, IA64::F11,
|
||||
IA64::F12, IA64::F13, IA64::F14, IA64::F15 };
|
||||
|
||||
SDOperand InFlag; // Null incoming flag value.
|
||||
|
||||
for (unsigned i = 2, e = N->getNumOperands(); i != e; ++i) {
|
||||
unsigned DestReg = 0;
|
||||
MVT::ValueType RegTy = N->getOperand(i).getValueType();
|
||||
if (RegTy == MVT::i64) {
|
||||
assert((i-2) < 8 && "Too many int args");
|
||||
DestReg = intArgs[i-2];
|
||||
} else {
|
||||
assert(MVT::isFloatingPoint(N->getOperand(i).getValueType()) &&
|
||||
"Unpromoted integer arg?");
|
||||
assert(used_FPArgs < 8 && "Too many fp args");
|
||||
DestReg = FPArgs[used_FPArgs++];
|
||||
}
|
||||
|
||||
if (N->getOperand(i).getOpcode() != ISD::UNDEF) {
|
||||
SDOperand Val = Select(N->getOperand(i));
|
||||
if(MVT::isInteger(N->getOperand(i).getValueType())) {
|
||||
Chain = CurDAG->getCopyToReg(Chain, DestReg, Val, InFlag);
|
||||
InFlag = Chain.getValue(1);
|
||||
CallOperands.push_back(CurDAG->getRegister(DestReg, RegTy));
|
||||
}
|
||||
// some functions (e.g. printf) want floating point arguments
|
||||
// *also* passed as in-memory representations in integer registers
|
||||
// this is FORTRAN legacy junk which we don't _always_ need
|
||||
// to do, but to be on the safe side, we do.
|
||||
else if(MVT::isFloatingPoint(N->getOperand(i).getValueType())) {
|
||||
assert((i-2) < 8 && "FP args alone would fit, but no int regs left");
|
||||
// first copy into the appropriate FP reg
|
||||
Chain = CurDAG->getCopyToReg(Chain, DestReg, Val);
|
||||
// then copy into the appropriate integer reg
|
||||
DestReg = intArgs[i-2];
|
||||
// GETFD takes an FP reg and writes a GP reg
|
||||
Chain = CurDAG->getTargetNode(IA64::GETFD, MVT::i64, Val);
|
||||
// FIXME: this next line is a bit unfortunate
|
||||
Chain = CurDAG->getCopyToReg(Chain, DestReg, Chain, InFlag);
|
||||
InFlag = Chain.getValue(1);
|
||||
CallOperands.push_back(CurDAG->getRegister(DestReg, MVT::i64));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Finally, once everything is in registers to pass to the call, emit the
|
||||
// call itself.
|
||||
if (InFlag.Val)
|
||||
CallOperands.push_back(InFlag); // Strong dep on register copies.
|
||||
else
|
||||
CallOperands.push_back(Chain); // Weak dep on whatever occurs before
|
||||
Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, MVT::Flag,
|
||||
CallOperands);
|
||||
|
||||
std::vector<SDOperand> CallResults;
|
||||
|
||||
// If the call has results, copy the values out of the ret val registers.
|
||||
switch (N->getValueType(0)) {
|
||||
default: assert(0 && "Unexpected ret value!");
|
||||
case MVT::Other: break;
|
||||
case MVT::i1: {
|
||||
// bools are returned as bytes 0/1 in r8
|
||||
SDOperand byteval = CurDAG->getCopyFromReg(Chain, IA64::r8, MVT::i64,
|
||||
Chain.getValue(1));
|
||||
Chain = byteval.getValue(1);
|
||||
Chain = CurDAG->getTargetNode(IA64::CMPNE, MVT::i1, MVT::Other,
|
||||
byteval, CurDAG->getRegister(IA64::r0, MVT::i64)).getValue(1);
|
||||
CallResults.push_back(Chain.getValue(0));
|
||||
break;
|
||||
}
|
||||
case MVT::i64:
|
||||
Chain = CurDAG->getCopyFromReg(Chain, IA64::r8, MVT::i64,
|
||||
Chain.getValue(1)).getValue(1);
|
||||
CallResults.push_back(Chain.getValue(0));
|
||||
break;
|
||||
case MVT::f64:
|
||||
Chain = CurDAG->getCopyFromReg(Chain, IA64::F8, N->getValueType(0),
|
||||
Chain.getValue(1)).getValue(1);
|
||||
CallResults.push_back(Chain.getValue(0));
|
||||
break;
|
||||
}
|
||||
|
||||
// restore GP, SP and RP - FIXME: this doesn't quite work (e.g.
|
||||
// methcall / objinst both segfault on exit) and it *really*
|
||||
// doesn't work unless you have -sched=none
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::r1, GPBeforeCall);
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::r12, SPBeforeCall);
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::rp, RPBeforeCall);
|
||||
CallResults.push_back(Chain); // llc segfaults w/o this,
|
||||
// ary3(e.g.) SIGILLs with 3
|
||||
|
||||
for (unsigned i = 0, e = CallResults.size(); i != e; ++i)
|
||||
CodeGenMap[Op.getValue(i)] = CallResults[i];
|
||||
|
||||
return CallResults[Op.ResNo];
|
||||
}
|
||||
|
||||
// Select - Convert the specified operand from a target-independent to a
|
||||
// target-specific node if it hasn't already been changed.
|
||||
SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
|
||||
@ -527,8 +341,37 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
|
||||
switch (N->getOpcode()) {
|
||||
default: break;
|
||||
|
||||
case ISD::Register: return Op; // XXX: this is a hack, tblgen one day?
|
||||
|
||||
case ISD::CALL:
|
||||
case ISD::TAILCALL: return SelectCALL(Op);
|
||||
case ISD::TAILCALL: { {
|
||||
// FIXME: This is a workaround for a bug in tblgen.
|
||||
// Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag)
|
||||
// Emits: (CALL:void (tglobaladdr:i32):$dst)
|
||||
// Pattern complexity = 2 cost = 1
|
||||
SDOperand N1 = N->getOperand(1);
|
||||
if (N1.getOpcode() != ISD::TargetGlobalAddress &&
|
||||
N1.getOpcode() != ISD::ExternalSymbol) goto P47Fail;
|
||||
SDOperand InFlag = SDOperand(0, 0);
|
||||
SDOperand Chain = N->getOperand(0);
|
||||
SDOperand Tmp0 = N1;
|
||||
Chain = Select(Chain);
|
||||
SDOperand Result;
|
||||
if (N->getNumOperands() == 3) {
|
||||
InFlag = Select(N->getOperand(2));
|
||||
Result = CurDAG->getTargetNode(IA64::BRCALL, MVT::Other, MVT::Flag, Tmp0,
|
||||
Chain, InFlag);
|
||||
} else {
|
||||
Result = CurDAG->getTargetNode(IA64::BRCALL, MVT::Other, MVT::Flag, Tmp0,
|
||||
Chain);
|
||||
}
|
||||
Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0);
|
||||
CodeGenMap[SDOperand(N, 1)] = Result.getValue(1);
|
||||
return Result.getValue(Op.ResNo);
|
||||
}
|
||||
P47Fail:;
|
||||
|
||||
}
|
||||
|
||||
case ISD::FDIV:
|
||||
case ISD::SDIV:
|
||||
@ -601,7 +444,16 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
|
||||
CurDAG->getRegister(IA64::r1, MVT::i64), GA);
|
||||
return CurDAG->getTargetNode(IA64::LD8, MVT::i64, Tmp);
|
||||
}
|
||||
|
||||
|
||||
/* XXX case ISD::ExternalSymbol: {
|
||||
SDOperand EA = CurDAG->getTargetExternalSymbol(cast<ExternalSymbolSDNode>(N)->getSymbol(),
|
||||
MVT::i64);
|
||||
SDOperand Tmp = CurDAG->getTargetNode(IA64::ADDL_EA, MVT::i64,
|
||||
CurDAG->getRegister(IA64::r1, MVT::i64), EA);
|
||||
return CurDAG->getTargetNode(IA64::LD8, MVT::i64, Tmp);
|
||||
}
|
||||
*/
|
||||
|
||||
case ISD::LOAD:
|
||||
case ISD::EXTLOAD:
|
||||
case ISD::ZEXTLOAD: {
|
||||
@ -615,10 +467,13 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
|
||||
default: N->dump(); assert(0 && "Cannot load this type!");
|
||||
case MVT::i1: { // this is a bool
|
||||
Opc = IA64::LD1; // first we load a byte, then compare for != 0
|
||||
return CurDAG->SelectNodeTo(N, IA64::CMPNE, MVT::i1, MVT::Other,
|
||||
if(N->getValueType(0) == MVT::i1) // XXX: early exit!
|
||||
return CurDAG->SelectNodeTo(N, IA64::CMPNE, MVT::i1, MVT::Other,
|
||||
CurDAG->getTargetNode(Opc, MVT::i64, Address),
|
||||
CurDAG->getRegister(IA64::r0, MVT::i64),
|
||||
Chain).getValue(Op.ResNo);
|
||||
/* otherwise, we want to load a bool into something bigger: LD1
|
||||
will do that for us, so we just fall through */
|
||||
}
|
||||
case MVT::i8: Opc = IA64::LD1; break;
|
||||
case MVT::i16: Opc = IA64::LD2; break;
|
||||
@ -690,6 +545,7 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
|
||||
|
||||
case ISD::RET: {
|
||||
SDOperand Chain = Select(N->getOperand(0)); // Token chain.
|
||||
SDOperand InFlag;
|
||||
|
||||
switch (N->getNumOperands()) {
|
||||
default:
|
||||
@ -707,11 +563,13 @@ SDOperand IA64DAGToDAGISel::Select(SDOperand Op) {
|
||||
// we mark r8 as live on exit up above in LowerArguments()
|
||||
// BuildMI(BB, IA64::MOV, 1, IA64::r8).addReg(Tmp1);
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::r8, RetVal);
|
||||
InFlag = Chain.getValue(1);
|
||||
break;
|
||||
case MVT::f64:
|
||||
// we mark F8 as live on exit up above in LowerArguments()
|
||||
// BuildMI(BB, IA64::FMOV, 1, IA64::F8).addReg(Tmp1);
|
||||
Chain = CurDAG->getCopyToReg(Chain, IA64::F8, RetVal);
|
||||
InFlag = Chain.getValue(1);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user