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Avoid some 's' 16-bit instruction which partially update CPSR

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(and add false dependency) when it isn't dependent on last CPSR defining
instruction. rdar://8928208

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129773 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2011-04-19 18:11:49 +00:00
parent f6a4d3c2f3
commit 5dde893c2b
5 changed files with 197 additions and 85 deletions
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11
lib/Target/ARM/ARM.td
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@@ -67,6 +67,14 @@ def FeatureNEONForFP : SubtargetFeature<"neonfp", "UseNEONForSinglePrecisionFP",
def FeaturePref32BitThumb : SubtargetFeature<"32bit", "Pref32BitThumb", "true",
"Prefer 32-bit Thumb instrs">;
/// Some instructions update CPSR partially, which can add false dependency for
/// out-of-order implementation, e.g. Cortex-A9, unless each individual bit is
/// mapped to a separate physical register. Avoid partial CPSR update for these
/// processors.
def FeatureAvoidPartialCPSR : SubtargetFeature<"avoid-partial-cpsr",
"AvoidCPSRPartialUpdate", "true",
"Avoid CPSR partial update for OOO execution">;
// Multiprocessing extension.
def FeatureMP : SubtargetFeature<"mp", "HasMPExtension", "true",
"Supports Multiprocessing extension">;
@@ -111,7 +119,8 @@ def ProcA8 : SubtargetFeature<"a8", "ARMProcFamily", "CortexA8",
def ProcA9 : SubtargetFeature<"a9", "ARMProcFamily", "CortexA9",
"Cortex-A9 ARM processors",
[FeatureHasSlowFPVMLx, FeatureVMLxForwarding,
FeatureT2XtPk, FeatureFP16]>;
FeatureT2XtPk, FeatureFP16,
FeatureAvoidPartialCPSR]>;
class ProcNoItin<string Name, list<SubtargetFeature> Features>
: Processor<Name, GenericItineraries, Features>;