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LLVM backend for 6502
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b82f8a28e8
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Hans Wennborg b82f8a28e8 Revert "X86 memcpy lowering: use "rep movs" even when esi is used as base pointer" (r204174) 
>  For functions where esi is used as base pointer, we would previously fall ba
>  from lowering memcpy with "rep movs" because that clobbers esi.
>
>  With this patch, we just store esi in another physical register, and restore
>  it afterwards. This adds a little bit of register preassure, but the more
>  efficient memcpy should be worth it.
>
>  Differential Revision: http://llvm-reviews.chandlerc.com/D2968

This didn't work. I was ending up with code like this:

  lea     edi,[esi+38h]
  mov     ecx,0Fh
  mov     edx,esi
  mov     esi,ebx
  rep movs dword ptr es:[edi],dword ptr [esi]
  lea     ecx,[esi+74h] <-- Ooops, we're now using esi before restoring it from edx.
  add     ebx,3Ch
  mov     esi,edx

I guess if we want to do this we need stronger glue or something, or doing the expansion
much later.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204829 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-26 16:30:54 +00:00
autoconf Remove projects/sample. 2014-03-12 22:40:22 +00:00
bindings [python-bindings] Remove some cruft that snuck in. 2014-02-23 04:43:26 +00:00
cmake Remove cmake module support for Visual C++ 2010 (MSVC10) 2014-03-25 09:34:20 +00:00
docs Clarify that select is only non-branching on the IR-level, it often ends 2014-03-26 15:30:21 +00:00
examples Fix warnings about an variable only used in asserts. 2014-03-06 06:35:46 +00:00
include ARM: add intrinsics for the v8 ldaex/stlex 2014-03-26 14:39:31 +00:00
lib Revert "X86 memcpy lowering: use "rep movs" even when esi is used as base pointer" (r204174) 2014-03-26 16:30:54 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test Revert "X86 memcpy lowering: use "rep movs" even when esi is used as base pointer" (r204174) 2014-03-26 16:30:54 +00:00
tools Create .symtab_shndxr only when needed. 2014-03-25 23:44:25 +00:00
unittests Fix these tests on windows. 2014-03-25 13:19:03 +00:00
utils remove a bunch of unused private methods 2014-03-23 17:09:26 +00:00
.arcconfig
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
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llvm.spec.in
LLVMBuild.txt
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Makefile.common
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Makefile.rules Use -std=gnu++11 on cygwin and mingw. 2014-03-12 20:01:15 +00:00
README.txt Revert "Test commit to check e-mail address. Please discard this." 2013-10-04 10:59:13 +00:00

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