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| author | Jim Grosbach <grosbach@apple.com> | 2010-03-25 23:32:19 +0000 |
|---|---|---|
| committer | Jim Grosbach <grosbach@apple.com> | 2010-03-25 23:32:19 +0000 |
| commit | bd17bc96bf54cc58d91c2d20964c6c5e28bffa57 (patch) | |
| tree | cab0b92000926f0dba8e5f471c7294d2009db045 | |
| parent | 44424646ac9db5c4d3919462bd0831ec22783085 (diff) | |
| download | external_llvm-bd17bc96bf54cc58d91c2d20964c6c5e28bffa57.zip external_llvm-bd17bc96bf54cc58d91c2d20964c6c5e28bffa57.tar.gz external_llvm-bd17bc96bf54cc58d91c2d20964c6c5e28bffa57.tar.bz2 | |
switch the flag for using NEON for SP floating point to a subtarget 'feature'
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99568 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/ARM/ARM.td | 13 | ||||
| -rw-r--r-- | lib/Target/ARM/ARMSubtarget.cpp | 14 |
2 files changed, 11 insertions, 16 deletions
diff --git a/lib/Target/ARM/ARM.td b/lib/Target/ARM/ARM.td index 50d54b4..931c81c 100644 --- a/lib/Target/ARM/ARM.td +++ b/lib/Target/ARM/ARM.td @@ -49,8 +49,14 @@ def FeatureFP16 : SubtargetFeature<"fp16", "HasFP16", "true", // FIXME: Currently, this is only flagged for Cortex-A8. It may be true for // others as well. We should do more benchmarking and confirm one way or // the other. -def HasSlowVMLx : SubtargetFeature<"vmlx", "SlowVMLx", "true", - "Disable VFP MAC instructions">; +def FeatureHasSlowVMLx : SubtargetFeature<"vmlx", "SlowVMLx", "true", + "Disable VFP MAC instructions">; +// Some processors benefit from using NEON instructions for scalar +// single-precision FP operations. +def FeatureNEONForFP : SubtargetFeature<"neonfp", "UseNEONForSinglePrecisionFP", + "true", + "Use NEON for single precision FP">; + //===----------------------------------------------------------------------===// // ARM Processors supported. @@ -115,7 +121,8 @@ def : Processor<"arm1156t2f-s", ARMV6Itineraries, // V7 Processors. def : Processor<"cortex-a8", CortexA8Itineraries, - [ArchV7A, FeatureThumb2, FeatureNEON, HasSlowVMLx]>; + [ArchV7A, FeatureThumb2, FeatureNEON, FeatureHasSlowVMLx, + FeatureNEONForFP]>; def : ProcNoItin<"cortex-a9", [ArchV7A, FeatureThumb2, FeatureNEON]>; //===----------------------------------------------------------------------===// diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp index 76ed66f..9e55cd8 100644 --- a/lib/Target/ARM/ARMSubtarget.cpp +++ b/lib/Target/ARM/ARMSubtarget.cpp @@ -22,10 +22,6 @@ using namespace llvm; static cl::opt<bool> ReserveR9("arm-reserve-r9", cl::Hidden, cl::desc("Reserve R9, making it unavailable as GPR")); -static cl::opt<bool> -UseNEONFP("arm-use-neon-fp", - cl::desc("Use NEON for single-precision FP"), - cl::init(false), cl::Hidden); static cl::opt<bool> UseMOVT("arm-use-movt", @@ -35,7 +31,7 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS, bool isT) : ARMArchVersion(V4) , ARMFPUType(None) - , UseNEONForSinglePrecisionFP(UseNEONFP) + , UseNEONForSinglePrecisionFP(false) , SlowVMLx(false) , IsThumb(isT) , ThumbMode(Thumb1) @@ -116,14 +112,6 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS, if (!isThumb() || hasThumb2()) PostRAScheduler = true; - - // Set CPU specific features. - if (CPUString == "cortex-a8") { - // On Cortex-a8, it's faster to perform some single-precision FP - // operations with NEON instructions. - if (UseNEONFP.getPosition() == 0) - UseNEONForSinglePrecisionFP = true; - } } /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol. |