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[AArch64] Add AArch64Subtarget::isFusion function.

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Summary:
isFusion returns true if the subtarget supports any kind of instruction
fusion, similar to ARMSubtarget::isFusion. This was suggested in D34142.

This changes the current behavior slightly, because the macro fusion mutation 
is now added to the PostRA MachineScheduler in case the subtarget supports
any kind of fusion. I think that makes sense because if the PostRA 
MachineScheduler is run, there is potential that instructions scheduled back to 
back are re-scheduled.

Reviewers: evandro, t.p.northover, joelkevinjones, joel_k_jones, steleman

Reviewed By: joelkevinjones

Subscribers: joel_k_jones, aemerson, rengolin, javed.absar, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D34958

llvm-svn: 307842
This commit is contained in:
Florian Hahn 2017-07-12 20:53:22 +00:00
parent 9dd9115a20
commit 52ecc1000b
2 changed files with 8 additions and 1 deletions
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7
lib/Target/AArch64/AArch64Subtarget.h
View File

@ -218,6 +218,13 @@ public:
bool hasArithmeticCbzFusion() const { return HasArithmeticCbzFusion; }
bool hasFuseAES() const { return HasFuseAES; }
bool hasFuseLiterals() const { return HasFuseLiterals; }
/// \brief Return true if the CPU supports any kind of instruction fusion.
bool hasFusion() const {
return hasArithmeticBccFusion() || hasArithmeticCbzFusion() ||
hasFuseAES() || hasFuseLiterals();
}
bool useRSqrt() const { return UseRSqrt; }
unsigned getMaxInterleaveFactor() const { return MaxInterleaveFactor; }
unsigned getVectorInsertExtractBaseCost() const {

2
lib/Target/AArch64/AArch64TargetMachine.cpp
View File

@ -287,7 +287,7 @@ public:
ScheduleDAGInstrs *
createPostMachineScheduler(MachineSchedContext *C) const override {
const AArch64Subtarget &ST = C->MF->getSubtarget<AArch64Subtarget>();
if (ST.hasFuseAES() || ST.hasFuseLiterals()) {
if (ST.hasFusion()) {
// Run the Macro Fusion after RA again since literals are expanded from
// pseudos then (v. addPreSched2()).
ScheduleDAGMI *DAG = createGenericSchedPostRA(C);