Evan Cheng 79590b8edf Instcombine was transforming: ... %shr = lshr i64 %key, 3 %0 = load i64* %val, align 8 %sub = add i64 %0, -1 %and = and i64 %sub, %shr ret i64 %and to: %shr = lshr i64 %key, 3 %0 = load i64* %val, align 8 %sub = add i64 %0, 2305843009213693951 %and = and i64 %sub, %shr ret i64 %and The demanded bit optimization is actually a pessimization because add -1 would be codegen'ed as a sub 1. Teach the demanded constant shrinking optimization to check for negated constant to make sure it is actually reducing the width of the constant. rdar://11793464 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160101 91177308-0d34-0410-b5e6-96231b3b80d8		2012-07-12 01:45:35 +00:00
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Hello
InstCombine	Instcombine was transforming:	2012-07-12 01:45:35 +00:00
Instrumentation	[tsan] fix compile-time falilure found while building Chromium with tsan (tsan issue #3). A unit test will follow separately.	2012-07-05 09:07:31 +00:00
IPO	GlobalOpt forgot to handle bitcast when analyzing globals. Found by inspection.	2012-07-02 18:55:39 +00:00
Scalar	BoundsChecking: optimize out the check for offset < 0 if size is known to be >= 0 (signed).	2012-07-03 17:30:18 +00:00
Utils	Reverted r156659, due to probable performance regressions, DenseMap should be used here:	2012-07-04 05:53:05 +00:00
Vectorize	Precompute SCEV pointer analysis prior to instruction fusion in BBVectorize.	2012-06-28 05:42:45 +00:00
CMakeLists.txt	Add a basic-block autovectorization pass.	2012-02-01 03:51:43 +00:00
LLVMBuild.txt	Add a basic-block autovectorization pass.	2012-02-01 03:51:43 +00:00
Makefile	Add a basic-block autovectorization pass.	2012-02-01 03:51:43 +00:00