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LLVM backend for 6502
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addc55af6c
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Chris Lattner addc55af6c When we have a two-address instruction where the input cannot be clobbered 
and is already available, instead of falling back to emitting a load, fall
back to emitting a reg-reg copy.  This generates significantly better code
for some SSE testcases, as SSE has lots of two-address instructions and
none of them are read/modify/write.  As one example, this change does:

        pshufd %XMM5, XMMWORD PTR [%ESP + 84], 255
        xorps %XMM2, %XMM5
        cmpltps %XMM1, %XMM0
-       movaps XMMWORD PTR [%ESP + 52], %XMM0
-       movapd %XMM6, XMMWORD PTR [%ESP + 52]
+       movaps %XMM6, %XMM0
        cmpltps %XMM6, XMMWORD PTR [%ESP + 68]
        movapd XMMWORD PTR [%ESP + 52], %XMM6
        movaps %XMM6, %XMM0
        cmpltps %XMM6, XMMWORD PTR [%ESP + 36]
        cmpltps %XMM3, %XMM0
-       movaps XMMWORD PTR [%ESP + 20], %XMM0
-       movapd %XMM7, XMMWORD PTR [%ESP + 20]
+       movaps %XMM7, %XMM0
        cmpltps %XMM7, XMMWORD PTR [%ESP + 4]
        movapd XMMWORD PTR [%ESP + 20], %XMM7
        cmpltps %XMM4, %XMM0

... which is far better than a store followed by a load!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28001 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-28 01:46:50 +00:00
autoconf For PR747: 2006-04-27 07:49:24 +00:00
docs Actually, semantical doesn't appear to be a word. 2006-04-26 21:03:17 +00:00
examples
include/llvm Added X86 SSE2 intrinsics which can be represented as vector_shuffles. This is 2006-04-24 23:34:56 +00:00
lib When we have a two-address instruction where the input cannot be clobbered 2006-04-28 01:46:50 +00:00
projects Have the AutoRegen.sh script prompt the user for the LLVM src and obj 2006-04-18 06:27:47 +00:00
runtime Invert the tests on LLVMGCC_MAJVERS to check for value 4 instead of value 2006-04-07 21:45:23 +00:00
test Test case for PR748 2006-04-28 01:21:37 +00:00
tools This no longer needs the JIT. 2006-04-22 05:04:23 +00:00
utils JumpTable support! What this represents is working asm and jit support for 2006-04-22 18:53:45 +00:00
win32 Keep Visual Studio informed. 2006-04-23 04:37:08 +00:00
Xcode Misc. project changes. html + build config changes supplied by Devang. 2006-04-08 06:04:56 +00:00
.cvsignore
configure For PR747: 2006-04-27 07:49:24 +00:00
CREDITS.TXT quick update 2006-04-13 02:05:30 +00:00
LICENSE.TXT Changing domain name 2006-04-20 05:51:53 +00:00
llvm.spec For PR723: 2006-04-07 16:07:37 +00:00
llvm.spec.in For PR723: 2006-04-07 16:07:37 +00:00
Makefile Include the win32 and Xcode directories in the distribution. 2006-04-12 20:53:14 +00:00
Makefile.common
Makefile.config.in Fix a comment. 2006-04-09 23:39:43 +00:00
Makefile.rules Remove traces of Burg utility now that its gone and not needed. 2006-04-20 18:42:24 +00:00
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