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ARM cortex-a8 doesn't do vmla/vmls well. disable them by default for that cpu

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llvm-svn: 99549
This commit is contained in:
Jim Grosbach 2010-03-25 20:48:50 +00:00
parent 58278a364d
commit 0975d55c8e
1 changed files with 6 additions and 0 deletions
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6
lib/Target/ARM/ARMSubtarget.cpp
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@ -127,6 +127,12 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
// operations with NEON instructions.
if (UseNEONFP.getPosition() == 0)
UseNEONForSinglePrecisionFP = true;
// The VFP vlma and vlms instructions don't play nicely with others;
// disable them.
// FIXME: This may be true for other variants as well. Get benchmark
// numbers and add them if determined that's the case.
if (UseVMLxInstructions.getPosition() == 0)
UseVMLx = false;
}
}