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LLVM backend for 6502
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a16b7cb1d3
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Chris Lattner a16b7cb1d3 Two changes: 
1) codegen a shift of a register as a shift, not an LEA.
2) teach the RA to convert a shift to an LEA instruction if it wants something
   in three-address form.

This gives us asm diffs like:

-       leal (,%eax,4), %eax
+       shll $2, %eax

which is faster on some processors and smaller on all of them.

and, more interestingly:

-       movl 24(%esi), %eax
-       leal (,%eax,4), %edi
+       movl 24(%esi), %edi
+       shll $2, %edi

Without #2, #1 was a significant pessimization in some cases.

This implements CodeGen/X86/shift-codegen.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35204 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-20 06:08:29 +00:00
autoconf Add possibility to set memory limit for binaries run via libSystem. This 2007-02-16 19:11:07 +00:00
docs Document LoopPass. 2007-03-19 22:21:25 +00:00
examples Revert last patch. The examples build now. 2007-03-06 17:26:14 +00:00
include Correct the name: isStrictPositive --> isStrictlyPositive. 2007-03-20 02:18:16 +00:00
lib Two changes: 2007-03-20 06:08:29 +00:00
projects avoid collision with /usr/bin/sample if this ever gets installed. 2007-02-18 03:03:41 +00:00
runtime crtend is only for llvm-gcc3, remove it. 2007-02-23 19:34:09 +00:00
test These functions should use shll, not lea. 2007-03-20 06:01:41 +00:00
tools Regenerate. 2007-03-15 03:26:42 +00:00
utils Recognize target instruction flag 'isReMaterializable'. 2007-03-19 06:20:37 +00:00
win32 Unbreak VC++ build. 2007-03-05 00:00:42 +00:00
Xcode Update project 2007-01-29 18:45:08 +00:00
.cvsignore Add llvm.spec, a generated file. 2006-10-18 19:23:56 +00:00
configure Regenerate for getrlimit/setrlimit. 2007-02-16 19:17:20 +00:00
CREDITS.TXT Credit self for Ada front-end. 2007-03-05 09:21:11 +00:00
LICENSE.TXT remove these. 2007-02-25 02:28:21 +00:00
llvm.spec.in Minor technical correction in documentation. 2006-08-21 01:58:57 +00:00
Makefile revert r1.68. This breaks 'make install' without doing 'make' first, but 2007-02-21 06:23:20 +00:00
Makefile.common Update comments to reflect new variable names. Patch contributed by 2005-02-14 16:02:19 +00:00
Makefile.config.in For PR739: 2007-01-17 20:24:45 +00:00
Makefile.rules correct dependency 2007-02-28 05:10:40 +00:00
README.txt

README.txt 

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

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