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[Lanai] Use ArgFlags to distinguish fixed parameters (#154278)

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Whether the argument is fixed is now available via ArgFlags, so make use
of it. The previous implementation was quite problematic, because it
stored the number of fixed arguments in a global variable, which is not
thread safe.
This commit is contained in:
Nikita Popov 2025-08-20 11:38:02 +02:00 committed by GitHub
parent 9df7ca1f0f
commit 5dbf73f54d
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GPG Key ID: B5690EEEBB952194
1 changed files with 3 additions and 11 deletions
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14
llvm/lib/Target/Lanai/LanaiISelLowering.cpp
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@ -353,7 +353,6 @@ void LanaiTargetLowering::LowerAsmOperandForConstraint(
#include "LanaiGenCallingConv.inc"
static unsigned NumFixedArgs;
static bool CC_Lanai32_VarArg(unsigned ValNo, MVT ValVT, MVT LocVT,
CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, Type *OrigTy,
@ -361,9 +360,8 @@ static bool CC_Lanai32_VarArg(unsigned ValNo, MVT ValVT, MVT LocVT,
// Handle fixed arguments with default CC.
// Note: Both the default and fast CC handle VarArg the same and hence the
// calling convention of the function is not considered here.
if (ValNo < NumFixedArgs) {
if (!ArgFlags.isVarArg())
return CC_Lanai32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, OrigTy, State);
}
// Promote i8/i16 args to i32
if (LocVT == MVT::i8 || LocVT == MVT::i16) {
@ -604,15 +602,9 @@ SDValue LanaiTargetLowering::LowerCCCCallTo(
GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
NumFixedArgs = 0;
if (IsVarArg && G) {
const Function *CalleeFn = dyn_cast<Function>(G->getGlobal());
if (CalleeFn)
NumFixedArgs = CalleeFn->getFunctionType()->getNumParams();
}
if (NumFixedArgs)
if (IsVarArg) {
CCInfo.AnalyzeCallOperands(Outs, CC_Lanai32_VarArg);
else {
} else {
if (CallConv == CallingConv::Fast)
CCInfo.AnalyzeCallOperands(Outs, CC_Lanai32_Fast);
else