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
..
Analysis	ScalarEvolution: Compute exit counts for loops with a power-of-2 step.	2014-03-25 16:25:12 +00:00
Assembler	Reject alias to undefined symbols in the verifier.	2014-03-12 20:15:49 +00:00
Bindings	Fix the ocaml test to not create a alias to a declaration.	2014-03-12 21:20:42 +00:00
Bitcode	Remove the linker_private and linker_private_weak linkages.	2014-03-13 23:18:37 +00:00
BugPoint	llvm/test/BugPoint/compile-custom.ll.py: Make it py3-compatible. [PR19112]	2014-03-13 00:10:37 +00:00
CodeGen	Revert "X86 memcpy lowering: use "rep movs" even when esi is used as base pointer" (r204174)	2014-03-26 16:30:54 +00:00
DebugInfo	Follow-up to r204790: don't try to emit line tables if there are no functions with DI in the TU	2014-03-26 11:24:36 +00:00
ExecutionEngine
Feature	Revert "Prevent alias from pointing to weak aliases."	2014-03-26 06:14:40 +00:00
FileCheck
Instrumentation	[msan] Relax the test some more.	2014-03-25 14:32:05 +00:00
Integer
JitListener
Linker	Switch the type field in DIVariable and DIGlobalVariable over to DITypeRefs.	2014-03-18 02:34:58 +00:00
LTO	Module: Don't rename in getOrInsertFunction()	2014-03-10 23:42:28 +00:00
MC	[mips] Use TwoOperandAliasConstraint for ArithLogicR instructions.	2014-03-26 16:09:43 +00:00
Object	Teach llvm-readobj to print human friendly description of reserved sections.	2014-03-24 05:00:34 +00:00
Other
TableGen
tools	Teach llvm-readobj to print human friendly description of reserved sections.	2014-03-24 05:00:34 +00:00
Transforms	Revert "Prevent alias from pointing to weak aliases."	2014-03-26 06:14:40 +00:00
Unit
Verifier	Reject alias to undefined symbols in the verifier.	2014-03-12 20:15:49 +00:00
YAMLParser
.clang-format
CMakeLists.txt
lit.cfg	Refactor llvm/test/lit.cfg to use lit.util.which.	2014-03-21 17:31:35 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh