[llvm-commits] Patch: Floating point optimizations for SimplifyInstruction
Michael Ilseman
milseman at apple.com
Tue Dec 4 15:19:36 PST 2012
Attached is a patch adding some floating-point optimizations to SimplifyInstruction, some of which take advantage of fast-math flags. Test cases included.
The optimizations themselves:
fsub X, 0 ==> X
fsub 0, (fsub 0, X) ==> X
fadd nsz X, 0 ==> X
fadd [nnan ninf] X, (fsub [nnan ninf] 0, X) ==> 0
where nnan and ninf have to occur at least once somewhere in this expression
fsub nnan ninf x, x ==> 0.0
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