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Add <imp-def> operands when reloading into physregs.

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When an instruction only writes sub-registers, it is still necessary to
add an <imp-def> operand for the super-register.  When reloading into a
virtual register, rewriting will add the operand, but when loading
directly into a virtual register, the <imp-def> operand is still
necessary.

llvm-svn: 152095
This commit is contained in:
Jakob Stoklund Olesen 2012-03-06 02:48:17 +00:00
parent fec0accf3d
commit d4e1cb591a
2 changed files with 5 additions and 0 deletions
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4
lib/Target/ARM/ARMBaseInstrInfo.cpp
View File

@ -935,6 +935,8 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::DefineNoRead, TRI);
MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::DefineNoRead, TRI);
MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::DefineNoRead, TRI);
if (TargetRegisterInfo::isPhysicalRegister(DestReg))
MIB.addReg(DestReg, RegState::ImplicitDefine);
}
} else
llvm_unreachable("Unknown reg class!");
@ -953,6 +955,8 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
MIB = AddDReg(MIB, DestReg, ARM::dsub_5, RegState::DefineNoRead, TRI);
MIB = AddDReg(MIB, DestReg, ARM::dsub_6, RegState::DefineNoRead, TRI);
MIB = AddDReg(MIB, DestReg, ARM::dsub_7, RegState::DefineNoRead, TRI);
if (TargetRegisterInfo::isPhysicalRegister(DestReg))
MIB.addReg(DestReg, RegState::ImplicitDefine);
} else
llvm_unreachable("Unknown reg class!");
break;

1
test/CodeGen/ARM/neon_spill.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -verify-machineinstrs
; RUN: llc < %s -verify-machineinstrs -O0
; PR12177
;
; This test case spills a QQQQ register.