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
..
CMakeLists.txt	build/CMake: Finish removal of add_llvm_library_dependencies.	2011-11-29 19:25:30 +00:00
InstCombine.h	add a new pass to instrument loads and stores for run-time bounds checking	2012-05-22 17:19:09 +00:00
InstCombineAddSub.cpp	canonicalize:	2012-06-08 22:30:05 +00:00
InstCombineAndOrXor.cpp	Fix combine of uno && ord -> false so that the ordering of the fcmps doesn't	2012-06-06 17:22:40 +00:00
InstCombineCalls.cpp	switch AttrListPtr::get to take an ArrayRef, simplifying a lot of clients.	2012-05-28 01:47:44 +00:00
InstCombineCasts.cpp	Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw".	2012-05-05 07:09:40 +00:00
InstCombineCompares.cpp	InstCombine: Turn (zext A) == (B & (1<<X)-1) into A == (trunc B), narrowing the compare.	2012-06-10 20:35:00 +00:00
InstCombineLoadStoreAlloca.cpp	Teach InstCombine to nuke a common alloca pattern -- an alloca which has	2012-04-08 14:36:56 +00:00
InstCombineMulDivRem.cpp	Remove some dead code and tidy things up now that vectors use ConstantDataVector	2012-02-06 21:56:39 +00:00
InstCombinePHI.cpp	Update instcombine for atomic load/store.	2011-08-15 22:09:40 +00:00
InstCombineSelect.cpp	Fix a bug in FoldSelectOpOp. Bitcast ops may change the number of vector elements, which may disagree with the select condition type.	2012-06-07 20:28:57 +00:00
InstCombineShifts.cpp	PR12967: Don't crash when trying to fold a shift that's larger than the type's size.	2012-05-27 22:03:32 +00:00
InstCombineSimplifyDemanded.cpp	Always compute all the bits in ComputeMaskedBits.	2012-04-04 12:51:34 +00:00
InstCombineVectorOps.cpp	continue making the world safe for ConstantDataVector. At this point,	2012-01-27 03:08:05 +00:00
InstCombineWorklist.h	Use an iterator instead of calling .size() on the worklist every time, which is wasteful.	2012-03-15 11:19:41 +00:00
InstructionCombining.cpp	add a new pass to instrument loads and stores for run-time bounds checking	2012-05-22 17:19:09 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00