diff options
| author | Sjoerd Meijer <sjoerd.meijer@arm.com> | 2018-10-17 10:05:44 +0000 |
|---|---|---|
| committer | Sjoerd Meijer <sjoerd.meijer@arm.com> | 2018-10-17 10:05:44 +0000 |
| commit | 64cfb74a61e097e64bc393008f44be53f942110e (patch) | |
| tree | dbfd355945dfe3923309fe1ab6bd366913daf733 /llvm/lib/Target | |
| parent | 7c8f91aa60600ffe3df9f6583432fa2cc38c5144 (diff) | |
| download | bcm5719-llvm-64cfb74a61e097e64bc393008f44be53f942110e.tar.gz bcm5719-llvm-64cfb74a61e097e64bc393008f44be53f942110e.zip | |
[ARM] Do not fuse VADD and VMUL, continued (2/2)
This is patch 2/2, following up on D53314, and is the functional change
to prevent fusing mul + add sequences into VFMAs.
Differential revision: https://reviews.llvm.org/D53315
llvm-svn: 344683
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMInstrInfo.td | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.td b/llvm/lib/Target/ARM/ARMInstrInfo.td index 529446ce809..fc8ed95ce8b 100644 --- a/llvm/lib/Target/ARM/ARMInstrInfo.td +++ b/llvm/lib/Target/ARM/ARMInstrInfo.td @@ -365,12 +365,14 @@ let RecomputePerFunction = 1 in { def UseMulOps : Predicate<"Subtarget->useMulOps()">; // Prefer fused MAC for fp mul + add over fp VMLA / VMLS if they are available. -// But only select them if more precision in FP computation is allowed. +// But only select them if more precision in FP computation is allowed, and when +// they are not slower than a mul + add sequence. // Do not use them for Darwin platforms. def UseFusedMAC : Predicate<"(TM.Options.AllowFPOpFusion ==" " FPOpFusion::Fast && " " Subtarget->hasVFP4()) && " - "!Subtarget->isTargetDarwin()">; + "!Subtarget->isTargetDarwin() &&" + "Subtarget->useFPVMLx()">; def HasFastVGETLNi32 : Predicate<"!Subtarget->hasSlowVGETLNi32()">; def HasSlowVGETLNi32 : Predicate<"Subtarget->hasSlowVGETLNi32()">; |
