Benjamin Kramer 66821d9020 InstCombine: Turn (zext A) == (B & (1<<X)-1) into A == (trunc B), narrowing the compare. ... This saves a cast, and zext is more expensive on platforms with subreg support than trunc is. This occurs in the BSD implementation of memchr(3), see PR12750. On the synthetic benchmark from that bug stupid_memchr and bsd_memchr have the same performance now when not inlining either function. stupid_memchr: 323.0us bsd_memchr: 321.0us memchr: 479.0us where memchr is the llvm-gcc compiled bsd_memchr from osx lion's libc. When inlining is enabled bsd_memchr still regresses down to llvm-gcc memchr time, I haven't fully understood the issue yet, something is grossly mangling the loop after inlining. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158297 91177308-0d34-0410-b5e6-96231b3b80d8		2012-06-10 20:35:00 +00:00
..
Analysis	Round 2 of dead private variable removal.	2012-06-06 19:47:08 +00:00
Archive
AsmParser	switch AttrListPtr::get to take an ArrayRef, simplifying a lot of clients.	2012-05-28 01:47:44 +00:00
Bitcode	PR1255: case ranges.	2012-06-02 09:42:43 +00:00
CodeGen	Allocate the contents of DwarfDebug's StringMaps in a single big BumpPtrAllocator.	2012-06-09 10:34:15 +00:00
DebugInfo	Fix a C++11 UDL conflict.	2012-04-04 20:33:56 +00:00
ExecutionEngine	Round 2 of dead private variable removal.	2012-06-06 19:47:08 +00:00
Linker	Supply a C interface to the "LinkModules" method.	2012-05-09 08:55:40 +00:00
MC	Add accessors for all private members of DisasmContext.	2012-06-06 20:45:10 +00:00
Object	Convert comments to proper Doxygen comments.	2012-06-09 00:01:45 +00:00
Support	Disabling a spurious deprecation warning about using PathV1 from within the PathV1 implementation file.	2012-06-09 13:59:29 +00:00
TableGen	Fix 80 columns.	2012-06-01 00:58:41 +00:00
Target	Enable ILP scheduling for all nodes by default on PPC.	2012-06-10 19:32:29 +00:00
Transforms	InstCombine: Turn (zext A) == (B & (1<<X)-1) into A == (trunc B), narrowing the compare.	2012-06-10 20:35:00 +00:00
VMCore	Add AutoUpgrade support for the SSE4 ptest intrinsics.	2012-06-10 18:42:51 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile