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[ppc64] fix bug in prologue that mfocrf's cr operand should be explict state instead of implicit

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This fixes PR27414

Reviewers: kbarton mgrang tjablin

http://reviews.llvm.org/D19255

llvm-svn: 267660
This commit is contained in:
Chuang-Yu Cheng 2016-04-27 02:59:28 +00:00
parent 1b19a8307b
commit d389efdf8e
2 changed files with 11 additions and 5 deletions
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14
lib/Target/PowerPC/PPCFrameLowering.cpp
View File

@ -843,12 +843,15 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF,
// mfocrf to selectively save just those fields, because mfocrf has short
// latency compares to mfcr.
unsigned MfcrOpcode = PPC::MFCR8;
if (isELFv2ABI && MustSaveCRs.size() == 1)
unsigned CrState = RegState::ImplicitKill;
if (isELFv2ABI && MustSaveCRs.size() == 1) {
MfcrOpcode = PPC::MFOCRF8;
CrState = RegState::Kill;
}
MachineInstrBuilder MIB =
BuildMI(MBB, MBBI, dl, TII.get(MfcrOpcode), TempReg);
for (unsigned i = 0, e = MustSaveCRs.size(); i != e; ++i)
MIB.addReg(MustSaveCRs[i], RegState::ImplicitKill);
MIB.addReg(MustSaveCRs[i], CrState);
BuildMI(MBB, MBBI, dl, TII.get(PPC::STW8))
.addReg(TempReg, getKillRegState(true))
.addImm(8)
@ -865,12 +868,15 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF,
// mfocrf to selectively save just those fields, because mfocrf has short
// latency compares to mfcr.
unsigned MfcrOpcode = PPC::MFCR8;
if (isELFv2ABI && MustSaveCRs.size() == 1)
unsigned CrState = RegState::ImplicitKill;
if (isELFv2ABI && MustSaveCRs.size() == 1) {
MfcrOpcode = PPC::MFOCRF8;
CrState = RegState::Kill;
}
MachineInstrBuilder MIB =
BuildMI(MBB, MBBI, dl, TII.get(MfcrOpcode), TempReg);
for (unsigned i = 0, e = MustSaveCRs.size(); i != e; ++i)
MIB.addReg(MustSaveCRs[i], RegState::ImplicitKill);
MIB.addReg(MustSaveCRs[i], CrState);
}
if (HasFP)

2
test/CodeGen/PowerPC/crsave.ll
View File

@ -1,6 +1,6 @@
; RUN: llc -O0 -disable-fp-elim -mtriple=powerpc-unknown-linux-gnu -mcpu=g5 < %s | FileCheck %s -check-prefix=PPC32
; RUN: llc -O0 -mtriple=powerpc64-unknown-linux-gnu -mcpu=g5 < %s | FileCheck %s -check-prefix=PPC64
; RUN: llc -O0 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s -check-prefix=PPC64-ELFv2
; RUN: llc -O0 -mtriple=powerpc64le-unknown-linux-gnu -verify-machineinstrs < %s | FileCheck %s -check-prefix=PPC64-ELFv2
declare void @foo()