Sanjay Patel d8214db086 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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219944 91177308-0d34-0410-b5e6-96231b3b80d8		2014-10-16 18:48:17 +00:00
..
IPO	Add control of function merging to the PMBuilder.	2014-09-13 21:46:00 +00:00
Utils	fold: sqrt(x * x * y) -> fabs(x) * sqrt(y)	2014-10-16 18:48:17 +00:00
Instrumentation.h	[ASan] Completely remove sanitizer blacklist file from instrumentation pass.	2014-07-08 00:50:49 +00:00
IPO.h	Move -verify-use-list-order into llvm-uselistorder	2014-07-25 17:13:03 +00:00
ObjCARC.h	Reformat linefeeds.	2014-05-26 00:25:26 +00:00
Scalar.h	[SimplifyCFG] threshold for folding branches with common destination	2014-09-30 22:23:38 +00:00
Vectorize.h	Allow vectorization of bit intrinsics in BB Vectorizer.	2014-04-25 03:33:48 +00:00