[llvm-commits] Fix Bug 13574: Add more double float shrinking optimizations

[Weiming Zhao]

Hi,

 

This patch fixes http://llvm.org/bugs/show_bug.cgi?id=13574

 

Current LLVM only supports 5 double->float shrinking optimizations
(floor->floorf, ceil->ceilf,round->roundf, rint->rintf() and
nearbyint->nearbyintf). 

 

This patch adds more math functions, for example, pow->powf, sin->sinf,
cos->cosf, etc.

 

In this patch:

1.     Since cos(), pow() and exp2() already have their own optimizers:
CosPot, PowOpt and Exp2Opt, respectively, I let them inherit from
UnaryDoubleFPOpt and in their CallOptimizer(), I let them to call the base
class's CallOptimizer() first.

For this change, I have to hoist the definition of UnaryDoubleFPOpt ahead of
CosOpt.

 

2.       Since some functions are not available on Windows, I updated
TargetLibraryInfo to mark them as unavailable.

 

3.       A unit test case is updated to test this patch.

 

Please help to review them.

 

Thanks,

Weiming

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