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Do not rely on the enum values of argument registers A0-A3 being consecutive.

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Define function getNextIntArgReg, which takes a register as a parameter and
returns the next O32 argument integer register. Use this function when double
precision floating point arguments are passed in two integer registers.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140363 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-09-23 00:58:33 +00:00
parent d8282cd64f
commit 373e3a4091
1 changed files with 11 additions and 3 deletions
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14
lib/Target/Mips/MipsISelLowering.cpp
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@ -1796,6 +1796,12 @@ static const unsigned O32IntRegs[] = {
Mips::A0, Mips::A1, Mips::A2, Mips::A3
};
// Return next O32 integer argument register.
static unsigned getNextIntArgReg(unsigned Reg) {
assert((Reg == Mips::A0) || (Reg == Mips::A2));
return (Reg == Mips::A0) ? Mips::A1 : Mips::A3;
}
// Write ByVal Arg to arg registers and stack.
static void
WriteByValArg(SDValue& ByValChain, SDValue Chain, DebugLoc dl,
@ -1988,8 +1994,10 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
Arg, DAG.getConstant(1, MVT::i32));
if (!Subtarget->isLittle())
std::swap(Lo, Hi);
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Lo));
RegsToPass.push_back(std::make_pair(VA.getLocReg()+1, Hi));
unsigned LocRegLo = VA.getLocReg();
unsigned LocRegHigh = getNextIntArgReg(LocRegLo);
RegsToPass.push_back(std::make_pair(LocRegLo, Lo));
RegsToPass.push_back(std::make_pair(LocRegHigh, Hi));
continue;
}
}
@ -2281,7 +2289,7 @@ MipsTargetLowering::LowerFormalArguments(SDValue Chain,
ArgValue = DAG.getNode(ISD::BITCAST, dl, MVT::f32, ArgValue);
if (RegVT == MVT::i32 && VA.getValVT() == MVT::f64) {
unsigned Reg2 = AddLiveIn(DAG.getMachineFunction(),
VA.getLocReg()+1, RC);
getNextIntArgReg(ArgReg), RC);
SDValue ArgValue2 = DAG.getCopyFromReg(Chain, dl, Reg2, RegVT);
if (!Subtarget->isLittle())
std::swap(ArgValue, ArgValue2);