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AArch64: implement copies to/from NZCV as a last ditch effort.

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A test in test/Generic creates a DAG where the NZCV output of an ADCS is used
by multiple nodes. This makes LLVM want to save a copy of NZCV for later, which
it couldn't do before.

This should be the last fix required for the aarch64 buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209651 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2014-05-27 12:16:02 +00:00
parent e43c5023fe
commit c74a70df6d
2 changed files with 20 additions and 2 deletions
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20
lib/Target/AArch64/AArch64InstrInfo.cpp
View File

@ -1507,7 +1507,25 @@ void AArch64InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
return;
}
assert(0 && "unimplemented reg-to-reg copy");
if (DestReg == AArch64::NZCV) {
assert(AArch64::GPR64RegClass.contains(SrcReg) && "Invalid NZCV copy");
BuildMI(MBB, I, DL, get(AArch64::MSR))
.addImm(AArch64SysReg::NZCV)
.addReg(SrcReg, getKillRegState(KillSrc))
.addReg(AArch64::NZCV, RegState::Implicit | RegState::Define);
return;
}
if (SrcReg == AArch64::NZCV) {
assert(AArch64::GPR64RegClass.contains(DestReg) && "Invalid NZCV copy");
BuildMI(MBB, I, DL, get(AArch64::MRS))
.addReg(DestReg)
.addImm(AArch64SysReg::NZCV)
.addReg(AArch64::NZCV, RegState::Implicit | getKillRegState(KillSrc));
return;
}
llvm_unreachable("unimplemented reg-to-reg copy");
}
void AArch64InstrInfo::storeRegToStackSlot(

2
lib/Target/AArch64/AArch64RegisterInfo.cpp
View File

@ -138,7 +138,7 @@ AArch64RegisterInfo::getPointerRegClass(const MachineFunction &MF,
const TargetRegisterClass *
AArch64RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const {
if (RC == &AArch64::CCRRegClass)
return nullptr; // Can't copy NZCV.
return &AArch64::GPR64RegClass; // Only MSR & MRS copy NZCV.
return RC;
}