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Sanjay Patel 494e59d7bc [LibCallSimplifier] try harder to fold memcmp with constant arguments 
Try to fold:
memcmp(X, C, ConstantLength) == 0 --> load X == *C

Without this change, we're unnecessarily checking the alignment of the constant data, 
so we miss the transform in the first 2 tests in the patch.

I noted this shortcoming of LibCallSimpifier in one of the recent CGP memcmp expansion 
patches. This doesn't help the example in:
https://bugs.llvm.org/show_bug.cgi?id=34032#c13
...directly, but it's worth short-circuiting more of these simple cases since we're 
already trying to do that.

The benefit of transforming to load+cmp is that existing IR analysis/transforms may
further simplify that code. For example, if the load of the variable is common to 
multiple memcmp calls, CSE can remove the duplicate instructions.

Differential Revision: https://reviews.llvm.org/D36922

llvm-svn: 311333
2017-08-21 13:55:49 +00:00
bindings Update the Go bindings for r309426 (remove offset from llvm.dbg.value) 2017-07-28 22:44:44 +00:00
cmake [CMake][LLVM] Remove duplicated library mask. Broken clang linking against clangShared 2017-08-10 13:37:58 +00:00
docs [Lexicon] Add "GEP" 2017-08-18 15:35:53 +00:00
examples [ORC][Kaleidoscope] Update Chapter 1 of BuildingAJIT to incorporate recent ORC 2017-08-15 19:20:10 +00:00
include [ARM][AArch64] Cortex-A75 and Cortex-A55 support 2017-08-21 08:43:06 +00:00
lib [LibCallSimplifier] try harder to fold memcmp with constant arguments 2017-08-21 13:55:49 +00:00
projects Add temporary workaround to allow in-tree libc++ builds on Windows 2017-05-11 01:44:30 +00:00
resources
runtimes [CMake][runtimes] Support for building target variants 2017-08-16 19:13:45 +00:00
test [LibCallSimplifier] try harder to fold memcmp with constant arguments 2017-08-21 13:55:49 +00:00
tools Keep Optimization Remark Yaml in NewPM 2017-08-20 01:30:45 +00:00
unittests [ARM][AArch64] Cortex-A75 and Cortex-A55 support 2017-08-21 08:43:06 +00:00
utils [AVX512] Add 128->256 vbroadcastf64x2/vbroadcasti64x2 instructions to the EVEX->VEX table. 2017-08-21 05:03:28 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt Remove RISCV from LLVM_ALL_TARGETS in CMakeLists.txt 2017-08-13 18:49:33 +00:00
CODE_OWNERS.TXT Remove the BBVectorize pass. 2017-06-30 07:09:08 +00:00
configure
CREDITS.TXT Another test commit 2017-07-01 03:24:06 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT [RelTest] Diana is doing both releases now 2017-07-14 08:33:52 +00:00

README.txt 

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