Bill Wendling e1b66f1145 Restrict this transformation to equality conditions. ... This transformation is not correct for not-equal conditions: (trunc x) != C1 & (and x, CA) != C2 -> (and x, CA|CMAX) != C1|C2 Let C1 == 0 C2 == 0 CA == 0xFF0000 CMAX == 0xFF and truncating to i8. The original truth table: x | A: trunc x != 0 | B: x & 0xFF0000 != 0 | A & B != 0 -------------------------------------------------------------- 0x00000 | 0 | 0 | 0 0x00001 | 1 | 0 | 0 0x10000 | 0 | 1 | 0 0x10001 | 1 | 1 | 1 The truth table of the replacement: x | x & 0xFF00FF != 0 ---------------------------- 0x00000 | 0 0x00001 | 1 0x10000 | 1 0x10001 | 1 So they are different. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151691 91177308-0d34-0410-b5e6-96231b3b80d8		2012-02-29 01:46:50 +00:00
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Hello
InstCombine	Restrict this transformation to equality conditions.	2012-02-29 01:46:50 +00:00
Instrumentation	[tsan] fix compiler warnings	2012-02-14 00:52:07 +00:00
IPO	Plog a memleak in GlobalOpt.	2012-02-27 12:48:24 +00:00
Scalar	Reverted r152620 - DSE: Shorten memset when a later store overwrites the start of it. There were all sorts of buildbot issues	2012-02-28 05:06:24 +00:00
Utils	Add support for disabling llvm.lifetime intrinsics in the AlwaysInliner. These	2012-02-25 02:56:01 +00:00
Vectorize	Update BBVectorize to use aliasesUnknownInst.	2012-02-10 15:52:40 +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