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LLVM backend for 6502
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73a5fa9ad6
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Wei Mi 73a5fa9ad6 Limiting gep merging to fix the performance problem described in 
https://llvm.org/bugs/show_bug.cgi?id=23163.

Gep merging sometimes behaves like a reverse CSE/LICM optimizations,
which has negative impact on performance. In this patch we restrict
gep merging to happen only when the indexes to be merged are both consts,
which ensures such merge is always beneficial.

The patch makes gep merging only happen in very restrictive cases.
It is possible that some analysis/optimization passes rely on the merged
geps to get better result, and we havn't notice them yet. We will be ready
to further improve it once we see the cases.

Differential Revision: http://reviews.llvm.org/D9007


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235451 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-21 22:37:09 +00:00
autoconf Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
bindings DebugInfo: Remove DIArray and DITypeArray typedefs 2015-04-21 20:07:38 +00:00
cmake Silence MSVC build alignment warnings 2015-04-21 22:29:38 +00:00
docs Minor edits to the llvm-cov documentation. 2015-04-21 16:32:02 +00:00
examples DebugInfo: Fix Kaleidoscope Ch. 8 after r235327 2015-04-20 21:29:44 +00:00
include Update comment. NFC. 2015-04-21 21:15:35 +00:00
lib Limiting gep merging to fix the performance problem described in 2015-04-21 22:37:09 +00:00
projects Reverse the order libc++ and libc++abi are added in CMake. 2015-03-04 01:16:43 +00:00
test Limiting gep merging to fix the performance problem described in 2015-04-21 22:37:09 +00:00
tools DebugInfo: Drop rest of DIDescriptor subclasses 2015-04-21 18:44:06 +00:00
unittests DebugInfo: Remove DIArray and DITypeArray typedefs 2015-04-21 20:07:38 +00:00
utils AVX-512: Added VPMOVx2M instructions for SKX, 2015-04-21 14:38:31 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Ignore compile_commands.json only at the root of the tree. 2015-03-26 18:55:42 +00:00
CMakeLists.txt [CMake] Updates to llvm-shlib to support overriding exports list and added an option to export all symbols. 2015-04-13 21:29:46 +00:00
CODE_OWNERS.TXT Add myself as the Constant Folder owner. 2015-04-20 23:19:10 +00:00
configure Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Try to unbreak Clang build to export LLVM_ABI_BREAKING_CHECKS, fixup for r233310. 2015-04-01 11:46:15 +00:00
Makefile.rules Add support for SunOS function/data sections and associated 2015-03-03 20:54:29 +00:00
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +00:00

README.txt 

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

This directory and its subdirectories contain source code for LLVM,
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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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If you're writing a package for LLVM, see docs/Packaging.rst for our
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