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GlobalISel: check for CImm rather than Imm on G_CONSTANTs.

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All G_CONSTANTS created by the MachineIRBuilder have an operand of type CImm
(i.e. a ConstantInt), so that's what the selector needs to look for.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296176 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2017-02-24 21:21:38 +00:00
parent f7f0f08973
commit e3a136c5b5
2 changed files with 8 additions and 6 deletions
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7
lib/CodeGen/GlobalISel/InstructionSelect.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
@ -187,8 +188,10 @@ bool InstructionSelector::isOperandImmEqual(
MachineInstr *Def = MRI.getVRegDef(MO.getReg());
if (Def->getOpcode() != TargetOpcode::G_CONSTANT)
return false;
assert(Def->getOperand(1).isImm() && "G_CONSTANT values must be constants");
return Def->getOperand(1).getImm() == Value;
assert(Def->getOperand(1).isCImm() &&
"G_CONSTANT values must be constants");
const ConstantInt &Imm = *Def->getOperand(1).getCImm();
return Imm.getBitWidth() <= 64 && Imm.getSExtValue() == Value;
}
return false;

7
test/CodeGen/AArch64/GlobalISel/arm64-instructionselect-xor.mir
View File

@ -100,7 +100,7 @@ body: |
liveins: %w0
%0(s32) = COPY %w0
%1(s32) = G_CONSTANT -1
%1(s32) = G_CONSTANT i64 -1
%2(s32) = G_XOR %0, %1
...
@ -128,7 +128,7 @@ body: |
liveins: %x0
%0(s64) = COPY %x0
%1(s64) = G_CONSTANT -1
%1(s64) = G_CONSTANT i64 -1
%2(s64) = G_XOR %0, %1
...
@ -157,10 +157,9 @@ body: |
bb.0:
liveins: %w0, %w1
successors: %bb.1
%1(s32) = G_CONSTANT -1
%1(s32) = G_CONSTANT i64 -1
G_BR %bb.1
bb.1:
%0(s32) = COPY %w0
%2(s32) = G_XOR %0, %1
...