Title: [161515] branches/jsCStack/Source/_javascript_Core
- Revision
- 161515
- Author
- [email protected]
- Date
- 2014-01-08 12:02:43 -0800 (Wed, 08 Jan 2014)
Log Message
Make it possible to disable the disabling of AVX
https://bugs.webkit.org/show_bug.cgi?id=126652
Not yet reviewed.
Who knows, maybe some newer Intel chips will actually run AVX code properly.
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::LowerDFGToLLVM::lower):
* runtime/Options.h:
Modified Paths
Diff
Modified: branches/jsCStack/Source/_javascript_Core/ChangeLog (161514 => 161515)
--- branches/jsCStack/Source/_javascript_Core/ChangeLog 2014-01-08 19:30:46 UTC (rev 161514)
+++ branches/jsCStack/Source/_javascript_Core/ChangeLog 2014-01-08 20:02:43 UTC (rev 161515)
@@ -1,3 +1,16 @@
+2014-01-08 Filip Pizlo <[email protected]>
+
+ Make it possible to disable the disabling of AVX
+ https://bugs.webkit.org/show_bug.cgi?id=126652
+
+ Not yet reviewed.
+
+ Who knows, maybe some newer Intel chips will actually run AVX code properly.
+
+ * ftl/FTLLowerDFGToLLVM.cpp:
+ (JSC::FTL::LowerDFGToLLVM::lower):
+ * runtime/Options.h:
+
2014-01-07 Michael Saboff <[email protected]>
CStack Branch: ARM64 DFG produces the wrong answer for X % 0
Modified: branches/jsCStack/Source/_javascript_Core/ftl/FTLLowerDFGToLLVM.cpp (161514 => 161515)
--- branches/jsCStack/Source/_javascript_Core/ftl/FTLLowerDFGToLLVM.cpp 2014-01-08 19:30:46 UTC (rev 161514)
+++ branches/jsCStack/Source/_javascript_Core/ftl/FTLLowerDFGToLLVM.cpp 2014-01-08 20:02:43 UTC (rev 161515)
@@ -98,7 +98,7 @@
m_ftlState.function = addFunction(
m_ftlState.module, name.data(), functionType(m_out.int64));
setFunctionCallingConv(m_ftlState.function, LLVMCCallConv);
- if (isX86()) {
+ if (isX86() && Options::llvmDisallowAVX()) {
// AVX makes V8/raytrace 80% slower. It makes Kraken/audio-oscillator 4.5x
// slower. It should be disabled.
addTargetDependentFunctionAttr(m_ftlState.function, "target-features", "-avx");
Modified: branches/jsCStack/Source/_javascript_Core/runtime/Options.h (161514 => 161515)
--- branches/jsCStack/Source/_javascript_Core/runtime/Options.h 2014-01-08 19:30:46 UTC (rev 161514)
+++ branches/jsCStack/Source/_javascript_Core/runtime/Options.h 2014-01-08 20:02:43 UTC (rev 161515)
@@ -137,6 +137,7 @@
v(unsigned, llvmBackendOptimizationLevel, 2) \
v(unsigned, llvmOptimizationLevel, 2) \
v(unsigned, llvmSizeLevel, 0) \
+ v(bool, llvmDisallowAVX, true) \
v(bool, ftlCrashes, false) /* fool-proof way of checking that you ended up in the FTL. ;-) */\
\
v(bool, enableConcurrentJIT, true) \
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