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[AArch64] Set FMOVS0 and FMOVD0 as isAsCheapAsAMove when needed.

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If a subtarget has both ZCZeroing and CustomCheapAsMoveHandling features (now
only Kryo has both), set FMOVS0 and FMOVD0 isAsCheapAsAMove.

Differential Revision: http://reviews.llvm.org/D22256

llvm-svn: 275178
This commit is contained in:
Haicheng Wu 2016-07-12 15:31:41 +00:00
parent 9bdd9cede2
commit 32b44f6a34
2 changed files with 10 additions and 4 deletions
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6
lib/Target/AArch64/AArch64InstrInfo.cpp
View File

@ -620,6 +620,12 @@ bool AArch64InstrInfo::isAsCheapAsAMove(const MachineInstr &MI) const {
return canBeExpandedToORR(MI, 32);
case AArch64::MOVi64imm:
return canBeExpandedToORR(MI, 64);
// It is cheap to move #0 to float registers if the subtarget has
// ZeroCycleZeroing feature.
case AArch64::FMOVS0:
case AArch64::FMOVD0:
return Subtarget.hasZeroCycleZeroing();
}
llvm_unreachable("Unknown opcode to check as cheap as a move!");

8
test/CodeGen/AArch64/arm64-zero-cycle-zeroing.ll
View File

@ -13,9 +13,9 @@ entry:
; CYCLONE: movi.2d v2, #0000000000000000
; CYCLONE: movi.2d v3, #0000000000000000
; KRYO: movi v0.2d, #0000000000000000
; KRYO: mov v1.16b, v0.16b
; KRYO: mov v2.16b, v0.16b
; KRYO: mov v3.16b, v0.16b
; KRYO: movi v1.2d, #0000000000000000
; KRYO: movi v2.2d, #0000000000000000
; KRYO: movi v3.2d, #0000000000000000
tail call void @bar(double 0.000000e+00, double 0.000000e+00, double 0.000000e+00, double 0.000000e+00) nounwind
ret void
}
@ -46,7 +46,7 @@ define void @t4() nounwind ssp {
; CYCLONE: movi.2d v0, #0000000000000000
; CYCLONE: movi.2d v1, #0000000000000000
; KRYO: movi v0.2d, #0000000000000000
; KRYO: mov v1.16b, v0.16b
; KRYO: movi v1.2d, #0000000000000000
tail call void @barf(float 0.000000e+00, float 0.000000e+00) nounwind
ret void
}