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LLVM backend for 6502
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3ddcc43040
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Chris Lattner 3ddcc43040 fix the BuildVector -> unpcklps logic to not do pointless shuffles 
when the top elements of a vector are undefined.  This happens all
the time for X86-64 ABI stuff because only the low 2 elements of
a 4 element vector are defined.  For example, on:

_Complex float f32(_Complex float A, _Complex float B) {
  return A+B;
}

We used to produce (with SSE2, SSE4.1+ uses insertps):

_f32:                                   ## @f32
	movdqa	%xmm0, %xmm2
	addss	%xmm1, %xmm2
	pshufd	$16, %xmm2, %xmm2
	pshufd	$1, %xmm1, %xmm1
	pshufd	$1, %xmm0, %xmm0
	addss	%xmm1, %xmm0
	pshufd	$16, %xmm0, %xmm1
	movdqa	%xmm2, %xmm0
	unpcklps	%xmm1, %xmm0
	ret

We now produce:

_f32:                                   ## @f32
	movdqa	%xmm0, %xmm2
	addss	%xmm1, %xmm2
	pshufd	$1, %xmm1, %xmm1
	pshufd	$1, %xmm0, %xmm3
	addss	%xmm1, %xmm3
	movaps	%xmm2, %xmm0
	unpcklps	%xmm3, %xmm0
	ret

This implements rdar://8368414


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112378 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-28 17:28:30 +00:00
autoconf remove the MSIL backend. It isn't maintained, is buggy, has no testcases 2010-08-28 16:33:36 +00:00
bindings Remove unions from the ocaml bindings. 2010-08-28 09:47:42 +00:00
cmake Updated CMake library dependencies. Removed unnecessary component name 2010-08-26 02:29:53 +00:00
docs remove the MSIL backend. It isn't maintained, is buggy, has no testcases 2010-08-28 16:33:36 +00:00
examples Trailing whitespace. 2010-08-19 20:03:53 +00:00
include remove unions from LLVM IR. They are severely buggy and not 2010-08-28 04:09:24 +00:00
lib fix the BuildVector -> unpcklps logic to not do pointless shuffles 2010-08-28 17:28:30 +00:00
projects Remove bogus link. 2010-07-16 06:33:36 +00:00
runtime
test fix the BuildVector -> unpcklps logic to not do pointless shuffles 2010-08-28 17:28:30 +00:00
tools Straighten out any triple strings passed on the command line before 2010-08-28 01:30:02 +00:00
unittests StringRef::compare_numeric also differed from StringRef::compare for characters > 127. 2010-08-26 15:25:35 +00:00
utils more dead thing zapping. 2010-08-28 03:43:50 +00:00
website
build-for-llvm-top.sh
CMakeLists.txt CMake: system for providing llvm-config-like features to the user. 2010-08-09 03:26:43 +00:00
configure remove the MSIL backend. It isn't maintained, is buggy, has no testcases 2010-08-28 16:33:36 +00:00
CREDITS.TXT long past time I added myself to this, I suppose. 2010-07-19 22:04:28 +00:00
LICENSE.TXT
llvm.spec.in
Makefile llvmc: remove dynamic plugins. 2010-08-15 07:07:12 +00:00
Makefile.common
Makefile.config.in Make the makefiles go much faster by using the realpath 2010-08-03 22:53:22 +00:00
Makefile.rules Fix the "Finished Creating" messages for aliases to print the 2010-08-18 01:35:53 +00:00
ModuleInfo.txt
README.txt (Hopefully) One last test. 2010-07-27 00:04:55 +00:00

README.txt 

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

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LLVM is open source software. You may freely distribute it under the terms of
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Please see the HTML documentation provided in docs/index.html for further
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If you're writing a package for LLVM, see docs/Packaging.html for our
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