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[PowerPC] fix register class after converting X-FORM instruction to D-FORM instruction 

Differential Revision: https://reviews.llvm.org/D55806

llvm-svn: 350111
This commit is contained in:
Chen Zheng 2018-12-28 01:02:35 +00:00
parent 10828c39cb
commit 5ede950df9
2 changed files with 14 additions and 9 deletions
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19
llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -3438,15 +3438,20 @@ bool PPCInstrInfo::transformToImmFormFedByLI(MachineInstr &MI,
if (III.OpNoForForwarding != III.ImmOpNo)
swapMIOperands(MI, III.OpNoForForwarding, III.ImmOpNo);
// If the R0/X0 register is special for the original instruction and not for
// the new instruction (or vice versa), we need to fix up the register class.
// If the special R0/X0 register index are different for original instruction
// and new instruction, we need to fix up the register class in new
// instruction.
if (!PostRA && III.ZeroIsSpecialOrig != III.ZeroIsSpecialNew) {
if (!III.ZeroIsSpecialOrig) {
if (III.ZeroIsSpecialNew) {
// If operand at III.ZeroIsSpecialNew is physical reg(eg: ZERO/ZERO8), no
// need to fix up register class.
unsigned RegToModify = MI.getOperand(III.ZeroIsSpecialNew).getReg();
const TargetRegisterClass *NewRC =
MRI.getRegClass(RegToModify)->hasSuperClassEq(&PPC::GPRCRegClass) ?
&PPC::GPRC_and_GPRC_NOR0RegClass : &PPC::G8RC_and_G8RC_NOX0RegClass;
MRI.setRegClass(RegToModify, NewRC);
if (TargetRegisterInfo::isVirtualRegister(RegToModify)) {
const TargetRegisterClass *NewRC =
MRI.getRegClass(RegToModify)->hasSuperClassEq(&PPC::GPRCRegClass) ?
&PPC::GPRC_and_GPRC_NOR0RegClass : &PPC::G8RC_and_G8RC_NOX0RegClass;
MRI.setRegClass(RegToModify, NewRC);
}
}
}
return true;

4
llvm/test/CodeGen/PowerPC/convert-rr-to-ri-instrs.mir
View File

@ -1,5 +1,5 @@
# RUN: llc -run-pass ppc-mi-peepholes -ppc-convert-rr-to-ri %s -o - | FileCheck %s
# RUN: llc -start-after ppc-mi-peepholes -ppc-late-peephole %s -o - | FileCheck %s --check-prefix=CHECK-LATE
# RUN: llc -run-pass ppc-mi-peepholes -ppc-convert-rr-to-ri %s -o - -verify-machineinstrs | FileCheck %s
# RUN: llc -start-after ppc-mi-peepholes -ppc-late-peephole %s -o - -verify-machineinstrs | FileCheck %s --check-prefix=CHECK-LATE
--- |
; ModuleID = 'convert-rr-to-ri-instrs.ll'