Sanjay Patel c699a6117b fold: sqrt(x * x * y) -> fabs(x) * sqrt(y) ... If a square root call has an FP multiplication argument that can be reassociated, then we can hoist a repeated factor out of the square root call and into a fabs(). In the simplest case, this: y = sqrt(x * x); becomes this: y = fabs(x); This patch relies on an earlier optimization in instcombine or reassociate to put the multiplication tree into a canonical form, so we don't have to search over every permutation of the multiplication tree. Because there are no IR-level FastMathFlags for intrinsics (PR21290), we have to use function-level attributes to do this optimization. This needs to be fixed for both the intrinsics and in the backend. Differential Revision: http://reviews.llvm.org/D5787 llvm-svn: 219944		2014-10-16 18:48:17 +00:00
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llvm	fold: sqrt(x * x * y) -> fabs(x) * sqrt(y)	2014-10-16 18:48:17 +00:00
llvm-c	Introduce LLVMWriteBitcodeToMemoryBuffer C API function.	2014-10-14 00:30:59 +00:00