unsigned SIRegisterInfo::getNumReservedSGPRs(const SISubtarget &ST,
const SIMachineFunctionInfo &MFI) const {
if (MFI.hasFlatScratchInit()) {
if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
return 6; // FLAT_SCRATCH, XNACK, VCC (in that order)
if (ST.getGeneration() == AMDGPUSubtarget::SEA_ISLANDS)
return 4; // FLAT_SCRATCH, VCC (in that order)
}
if (ST.isXNACKEnabled())
return 4; // XNACK, VCC (in that order)
return 2; // VCC.
}
static unsigned getNumExtraSGPRs(const SISubtarget &ST,
bool VCCUsed,
bool FlatScrUsed) {
unsigned ExtraSGPRs = 0;
if (VCCUsed)
ExtraSGPRs = 2;
if (ST.getGeneration() < SISubtarget::VOLCANIC_ISLANDS) {
if (FlatScrUsed)
ExtraSGPRs = 4;
} else {
if (ST.isXNACKEnabled())
ExtraSGPRs = 4;
if (FlatScrUsed)
ExtraSGPRs = 6;
}
return ExtraSGPRs;
}