PPCHazardRecognizer970::PPCHazardRecognizer970(const TargetInstrInfo &tii)
: TII(tii) {
+ LastWasBL8_ELF = false;
EndDispatchGroup();
}
unsigned Opcode = MI->getOpcode();
+ // If the last instruction was a BL8_ELF, then the NOP must follow it
+ // directly (this is strong requirement from the linker due to the ELF ABI).
+ // We return only Hazard (and not NoopHazard) because if the NOP is necessary
+ // then it will already be in the instruction stream (it is not always
+ // necessary; tail calls, for example, do not need it).
+ if (LastWasBL8_ELF && Opcode != PPC::NOP)
+ return Hazard;
+
bool isFirst, isSingle, isCracked, isLoad, isStore;
PPCII::PPC970_Unit InstrType =
GetInstrType(Opcode, isFirst, isSingle, isCracked,
return;
unsigned Opcode = MI->getOpcode();
+ LastWasBL8_ELF = (Opcode == PPC::BL8_ELF);
bool isFirst, isSingle, isCracked, isLoad, isStore;
PPCII::PPC970_Unit InstrType =
}
void PPCHazardRecognizer970::Reset() {
+ LastWasBL8_ELF = false;
EndDispatchGroup();
}
// HasCTRSet - If the CTR register is set in this group, disallow BCTRL.
bool HasCTRSet;
+ // Was the last instruction issued a BL8_ELF
+ bool LastWasBL8_ELF;
+
// StoredPtr - Keep track of the address of any store. If we see a load from
// the same address (or one that aliases it), disallow the store. We can have
// up to four stores in one dispatch group, hence we track up to 4.