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LLVM backend for 6502
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Evan Cheng 376642ed62 Some enhancements for memcpy / memset inline expansion. 
1. Teach it to use overlapping unaligned load / store to copy / set the trailing
   bytes. e.g. On 86, use two pairs of movups / movaps for 17 - 31 byte copies.
2. Use f64 for memcpy / memset on targets where i64 is not legal but f64 is. e.g.
   x86 and ARM.
3. When memcpy from a constant string, do *not* replace the load with a constant
   if it's not possible to materialize an integer immediate with a single
   instruction (required a new target hook: TLI.isIntImmLegal()).
4. Use unaligned load / stores more aggressively if target hooks indicates they
   are "fast".
5. Update ARM target hooks to use unaligned load / stores. e.g. vld1.8 / vst1.8.
   Also increase the threshold to something reasonable (8 for memset, 4 pairs
   for memcpy).

This significantly improves Dhrystone, up to 50% on ARM iOS devices.

rdar://12760078


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169791 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-10 23:21:26 +00:00
autoconf Fix a pasto. 2012-11-19 19:31:02 +00:00
bindings [python] Add markup option to disassembler 2012-12-01 21:57:30 +00:00
cmake CMake: Don't run 'git svn' if there is no .git/svn directory. 2012-12-10 19:03:37 +00:00
docs Documentation: convert ReleaseNotes.html to reST. 2012-12-09 23:14:26 +00:00
examples Sort the #include lines of the examples/... tree. 2012-12-04 10:16:57 +00:00
include Some enhancements for memcpy / memset inline expansion. 2012-12-10 23:21:26 +00:00
lib Some enhancements for memcpy / memset inline expansion. 2012-12-10 23:21:26 +00:00
projects Clean up the sample include orderings, not that it really matters... 2012-12-04 10:46:21 +00:00
runtime libprofile/CommonProfiling.c: Fix according to C89. 2012-11-02 01:32:02 +00:00
test Some enhancements for memcpy / memset inline expansion. 2012-12-10 23:21:26 +00:00
tools Revert r169656. 2012-12-10 21:33:45 +00:00
unittests Reorganize FastMathFlags to be a wrapper around unsigned, and streamline some interfaces. 2012-12-09 21:12:04 +00:00
utils Fix PR14568: Avoid the DFA packetizer from making an invalid read 2012-12-10 22:45:57 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt [CMake] TARGET_TRIPLE may be internal alias of LLVM_DEFAULT_TARGET_TRIPLE. 2012-12-10 07:14:29 +00:00
CODE_OWNERS.TXT Taking ownership of indvars/lsr. 2012-12-05 23:32:44 +00:00
configure Fix a pasto. 2012-11-19 19:31:02 +00:00
CREDITS.TXT Update my email address. 2012-11-29 21:17:26 +00:00
LICENSE.TXT Few more small CellSPU removals. 2012-11-14 22:13:56 +00:00
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt LLVMBuild: Introduce a common section which currently has a list of the 2011-12-12 22:45:54 +00:00
Makefile [c-index-test] When building with BUILD_CLANG_ONLY=YES, include c-index-test. 2012-11-06 19:54:46 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Re-enable support for --program-prefix. 2012-10-01 18:40:32 +00:00
Makefile.rules Use MACOSX_DEPLOYMENT_TARGET when it is set. <rdar://problem/12433905> 2012-10-12 21:48:14 +00:00
README.txt Test commit. 2012-11-29 16:19:11 +00:00

README.txt 

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