Andrea Di Biagio cfdf805286 [X86] Teach how to combine horizontal binop even in the presence of undefs. ... Before this change, the backend was unable to fold a build_vector dag node with UNDEF operands into a single horizontal add/sub. This patch teaches how to combine a build_vector with UNDEF operands into a horizontal add/sub when possible. The algorithm conservatively avoids to combine a build_vector with only a single non-UNDEF operand. Added test haddsub-undef.ll to verify that we correctly fold horizontal binop even in the presence of UNDEFs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211265 91177308-0d34-0410-b5e6-96231b3b80d8		2014-06-19 10:29:41 +00:00
..
Analysis	Move optimization of some cases of (A & C1)|(B & C2) from instcombine to instsimplify. Patch by Rahul Jain, plus some last minute changes by me -- you can blame me for any bugs.	2014-06-19 03:51:46 +00:00
AsmParser	IR: add "cmpxchg weak" variant to support permitted failure.	2014-06-13 14:24:07 +00:00
Bitcode	Revert a C API difference that I incorrectly introduced.	2014-06-18 20:07:35 +00:00
CodeGen	Move -dwarf-version to an MC level command line option so it's	2014-06-19 06:22:08 +00:00
DebugInfo	[DWARF parser] Use distinction between DW_AT_ranges_base and DW_AT_GNU_ranges_base instead of DWARF version	2014-06-13 22:31:03 +00:00
ExecutionEngine	Replace Execution Engine's mutex with std::recursive_mutex.	2014-06-18 20:17:35 +00:00
IR	Make getBaseObject static.	2014-06-18 19:08:47 +00:00
IRReader	Remove 'using std::errro_code' from lib.	2014-06-13 02:24:39 +00:00
LineEditor
Linker	Replace some assert(0)'s with llvm_unreachable.	2014-06-18 05:05:13 +00:00
LTO	Remove 'using std::errro_code' from lib.	2014-06-13 02:24:39 +00:00
MC	Move -dwarf-version to an MC level command line option so it's	2014-06-19 06:22:08 +00:00
Object	Teach llvm-size to know about Mach-O universal files (aka fat files) and	2014-06-18 22:04:40 +00:00
Option	Options: Use erase_if to remove Args from the list.	2014-05-18 15:14:13 +00:00
ProfileData	Renaming SwapByteOrder() to getSwappedBytes()	2014-06-14 11:36:01 +00:00
Support	CommandLine: bail out when options get multiply registered	2014-06-19 07:25:25 +00:00
TableGen	Convert some assert(0) to llvm_unreachable or fold an 'if' condition into the assert.	2014-06-19 06:10:58 +00:00
Target	[X86] Teach how to combine horizontal binop even in the presence of undefs.	2014-06-19 10:29:41 +00:00
Transforms	Refactored and updated SimplifyUsingDistributiveLaws() to	2014-06-19 08:29:18 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile