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cfdf805286
llvm-6502/lib
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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 [CMake] Use LINK_LIBS instead of target_link_libraries(). 2014-02-26 06:41:29 +00:00
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 ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
LLVMBuild.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
Makefile ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00