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| author | Sanjay Patel <spatel@rotateright.com> | 2015-06-02 15:28:15 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2015-06-02 15:28:15 +0000 |
| commit | 6f031d848efb9dba1865a3884286ce660845a255 (patch) | |
| tree | 71bb75117d6a0759d8518e6ee00e6bb15b786706 /llvm/lib/Target/X86/X86.td | |
| parent | 199d0c9e764e69895d3d79553696de514be31ad2 (diff) | |
| download | bcm5719-llvm-6f031d848efb9dba1865a3884286ce660845a255.tar.gz bcm5719-llvm-6f031d848efb9dba1865a3884286ce660845a255.zip | |
make reciprocal estimate code generation more flexible by adding command-line options (2nd try)
The first try (r238051) to land this was reverted due to bot failures
that were hopefully addressed by r238788.
This patch adds a TargetRecip class for processing many recip codegen possibilities.
The class is intended to handle both command-line options to llc as well
as options passed in from a front-end such as clang with the -mrecip option.
The x86 backend is updated to use the new functionality.
Only -mcpu=btver2 with -ffast-math should see a functional change from this patch.
All other x86 CPUs continue to *not* use reciprocal estimates by default with -ffast-math.
Differential Revision: http://reviews.llvm.org/D8982
llvm-svn: 238842
Diffstat (limited to 'llvm/lib/Target/X86/X86.td')
| -rw-r--r-- | llvm/lib/Target/X86/X86.td | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/llvm/lib/Target/X86/X86.td b/llvm/lib/Target/X86/X86.td index c70e2e95463..7001910a61e 100644 --- a/llvm/lib/Target/X86/X86.td +++ b/llvm/lib/Target/X86/X86.td @@ -188,10 +188,6 @@ def FeatureSlowLEA : SubtargetFeature<"slow-lea", "SlowLEA", "true", "LEA instruction with certain arguments is slow">; def FeatureSlowIncDec : SubtargetFeature<"slow-incdec", "SlowIncDec", "true", "INC and DEC instructions are slower than ADD and SUB">; -def FeatureUseSqrtEst : SubtargetFeature<"use-sqrt-est", "UseSqrtEst", "true", - "Use RSQRT* to optimize square root calculations">; -def FeatureUseRecipEst : SubtargetFeature<"use-recip-est", "UseReciprocalEst", - "true", "Use RCP* to optimize division calculations">; def FeatureSoftFloat : SubtargetFeature<"soft-float", "UseSoftFloat", "true", "Use software floating point features.">; @@ -444,7 +440,7 @@ def : ProcessorModel<"btver2", BtVer2Model, FeaturePRFCHW, FeatureAES, FeaturePCLMUL, FeatureBMI, FeatureF16C, FeatureMOVBE, FeatureLZCNT, FeaturePOPCNT, FeatureFastUAMem, - FeatureSlowSHLD, FeatureUseSqrtEst, FeatureUseRecipEst]>; + FeatureSlowSHLD]>; // TODO: We should probably add 'FeatureFastUAMem' to all of the AMD chips. |
