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Index: llvm-toolchain-snapshot_21~++20250531102322+061ef3c6e227/llvm/lib/Target/Mips/MipsSubtarget.cpp
===================================================================
--- llvm-toolchain-snapshot_21~++20250531102322+061ef3c6e227.orig/llvm/lib/Target/Mips/MipsSubtarget.cpp
+++ llvm-toolchain-snapshot_21~++20250531102322+061ef3c6e227/llvm/lib/Target/Mips/MipsSubtarget.cpp
@@ -81,7 +81,7 @@ MipsSubtarget::MipsSubtarget(const Tripl
InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
HasDSPR2(false), HasDSPR3(false),
AllowMixed16_32(Mixed16_32 || Mips_Os16), Os16(Mips_Os16), HasMSA(false),
- UseTCCInDIV(false), HasSym32(false), HasEVA(false), DisableMadd4(false),
+ UseTCCInDIV(false), HasSym32(false), HasEVA(false), DisableMadd4(true),
HasMT(false), HasCRC(false), HasVirt(false), HasGINV(false),
UseIndirectJumpsHazard(false), StrictAlign(false),
StackAlignOverride(StackAlignOverride), TM(TM), TargetTriple(TT),
@@ -93,6 +93,9 @@ MipsSubtarget::MipsSubtarget(const Tripl
if (MipsArchVersion == MipsDefault)
MipsArchVersion = Mips32;
+ if (hasMips32r6() || hasMips64r6())
+ DisableMadd4 = false;
+
// MIPS-I has not been tested.
if (MipsArchVersion == Mips1 && !MIPS1WarningPrinted) {
errs() << "warning: MIPS-I support is experimental\n";
@@ -246,6 +249,7 @@ MipsSubtarget &
MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS,
const TargetMachine &TM) {
StringRef CPUName = MIPS_MC::selectMipsCPU(TM.getTargetTriple(), CPU);
+ SubtargetFeatures Features(FS);
// Parse features string.
ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
@@ -268,6 +272,13 @@ MipsSubtarget::initializeSubtargetDepend
reportFatalUsageError("64-bit code requested on a subtarget that doesn't "
"support it!");
+ for (const std::string &Feature : Features.getFeatures()) {
+ if (Feature == "+nomadd4")
+ DisableMadd4 = true;
+ else if (Feature == "-nomadd4")
+ DisableMadd4 = false;
+ }
+
return *this;
}
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