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| author | Dan Gohman <gohman@apple.com> | 2009-01-22 21:58:43 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-01-22 21:58:43 +0000 |
| commit | 760f86f3395750ef6d03ecfe6f82d2867fbf568b (patch) | |
| tree | bdf1046c3f79e9422ab88ada0c421ab4a687722c /lib/CodeGen/AsmPrinter/DwarfWriter.cpp | |
| parent | edc4d69917df7dc34543adf719d5c93249fd5e27 (diff) | |
Don't create ISD::FNEG nodes after legalize if they aren't legal.
Simplify x+0 to x in unsafe-fp-math mode. This avoids a bunch of
redundant work in many cases, because in unsafe-fp-math mode,
ISD::FADD with a constant is considered free to negate, so the
DAGCombiner often negates x+0 to -0-x thinking it's free, when
in reality the end result is -x, which is more expensive than x.
Also, combine x*0 to 0.
This fixes PR3374.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62789 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/AsmPrinter/DwarfWriter.cpp')
0 files changed, 0 insertions, 0 deletions