RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 11:42:57 +01:00
Code Issues Projects Releases Wiki Activity
Mirror of https://github.com/RPCS3/llvm-mirror
153,005 Commits 4 Branches 5 Tags 704 MiB
C++ 96.9%
C 1%
Python 1%
CMake 0.6%
OCaml 0.2%
Other 0.1%
e7f59bf4cc
Go to file
Sanjay Patel e7f59bf4cc [InstCombine] sink sext after ashr 
Narrow ops are better for bit-tracking, and in the case of vectors,
may enable better codegen.

As the trunc test shows, this can allow follow-on simplifications.

There's a block of code in visitTrunc that deals with shifted ops
with FIXME comments. It may be possible to remove some of that now,
but I want to make sure there are no problems with this step first.

http://rise4fun.com/Alive/Y3a

Name: hoist_ashr_ahead_of_sext_1
  %s = sext i8 %x to i32
  %r = ashr i32 %s, 3  ; shift value is < than source bit width
  =>
  %a = ashr i8 %x, 3
  %r = sext i8 %a to i32
  
Name: hoist_ashr_ahead_of_sext_2
  %s = sext i8 %x to i32
  %r = ashr i32 %s, 8  ; shift value is >= than source bit width
  =>
  %a = ashr i8 %x, 7   ; so clamp this shift value
  %r = sext i8 %a to i32
  
Name: junc_the_trunc  
  %a = sext i16 %v to i32
  %s = ashr i32 %a, 18
  %t = trunc i32 %s to i16
  =>
  %t = ashr i16 %v, 15
llvm-svn: 310942
2017-08-15 18:25:52 +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 [Doc] Update LangRef for new Module Flag Behavior 2017-08-15 16:16:33 +00:00
examples Defeat another -Wunused-but-set-variable warning 2017-07-19 15:06:31 +00:00
include [Dominators] Include infinite loops in PostDominatorTree 2017-08-15 18:14:57 +00:00
lib [InstCombine] sink sext after ashr 2017-08-15 18:25:52 +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] Remove redundant logic in runtimes/CMakeList.txt 2017-07-24 17:26:28 +00:00
test [InstCombine] sink sext after ashr 2017-08-15 18:25:52 +00:00
tools [llvm-cov] Add an option which maps the location of source directories on another machine to your local copies 2017-08-14 10:20:12 +00:00
unittests [Dominators] Include infinite loops in PostDominatorTree 2017-08-15 18:14:57 +00:00
utils test-release.sh: Move test-suite setup to beginning of the script 2017-08-15 18:11:56 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
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
RELEASE_TESTERS.TXT [RelTest] Diana is doing both releases now 2017-07-14 08:33:52 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.