Chris Lattner 8c5ad3a5da Rename ValueRequiresCast to ShouldOptimizeCast, to better reflect ...

what it does.  Enhance it to return false to optimizing vector
sign extensions from vector comparisions, which is the idiom used
to get a splatted vector for a vector comparison.

Doing this breaks vector-casts.ll, add some compensating 
transformations to handle the important case they cover without
depending on this canonicalization.

This fixes rdar://7434900 a serious pessimization of vector compares.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95855 91177308-0d34-0410-b5e6-96231b3b80d8

2010-02-11 06:26:33 +00:00

..

Hello

make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.

2010-01-24 20:43:08 +00:00

InstCombine

Rename ValueRequiresCast to ShouldOptimizeCast, to better reflect

2010-02-11 06:26:33 +00:00

Instrumentation

make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.

2010-01-24 20:43:08 +00:00

IPO

Strip new llvm.dbg.value intrinsic.

2010-02-10 21:19:56 +00:00

Scalar

Make DSE only scan blocks that are reachable from the entry

2010-02-11 05:11:54 +00:00

Utils

Teach SimplifyCFG about magic pointer constants.

2010-02-05 22:03:18 +00:00

Makefile

move instcombine to its own library, it's past time.

2010-01-04 06:23:24 +00:00