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LLVM backend for 6502
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e5a1426174
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Chris Lattner e5a1426174 optimize bitcast(trunc(bitcast(x))) where the result is a float and 'x' 
is a vector to be a vector element extraction.  This allows clang to
compile:

struct S { float A, B, C, D; };
float foo(struct S A) { return A.A + A.B+A.C+A.D; }

into:

_foo:                                   ## @foo
## BB#0:                                ## %entry
	movd	%xmm0, %rax
	shrq	$32, %rax
	movd	%eax, %xmm2
	addss	%xmm0, %xmm2
	movapd	%xmm1, %xmm3
	addss	%xmm2, %xmm3
	movd	%xmm1, %rax
	shrq	$32, %rax
	movd	%eax, %xmm0
	addss	%xmm3, %xmm0
	ret

instead of:

_foo:                                   ## @foo
## BB#0:                                ## %entry
	movd	%xmm0, %rax
	movd	%eax, %xmm0
	shrq	$32, %rax
	movd	%eax, %xmm2
	addss	%xmm0, %xmm2
	movd	%xmm1, %rax
	movd	%eax, %xmm1
	addss	%xmm2, %xmm1
	shrq	$32, %rax
	movd	%eax, %xmm0
	addss	%xmm1, %xmm0
	ret

... eliminating half of the horribleness.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112227 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-26 21:55:42 +00:00
autoconf Remove getsect checks, the result is unused and is broken anyhow. 2010-08-25 08:44:54 +00:00
bindings - Add the LinkerPrivateWeakDefAutoLinkage to the Ada bindings. 2010-08-24 20:00:52 +00:00
cmake Updated CMake library dependencies. Removed unnecessary component name 2010-08-26 02:29:53 +00:00
docs Create the new linker type "linker_private_weak_def_auto". 2010-08-20 22:05:50 +00:00
examples Trailing whitespace. 2010-08-19 20:03:53 +00:00
include add m_BitCast for matching a bitcast. 2010-08-26 21:35:52 +00:00
lib optimize bitcast(trunc(bitcast(x))) where the result is a float and 'x' 2010-08-26 21:55:42 +00:00
projects
runtime
test optimize bitcast(trunc(bitcast(x))) where the result is a float and 'x' 2010-08-26 21:55:42 +00:00
tools Fix prototypes. 2010-08-26 17:47:45 +00:00
unittests StringRef::compare_numeric also differed from StringRef::compare for characters > 127. 2010-08-26 15:25:35 +00:00
utils Experimental clang-based code-completion support for vim. This currently 2010-08-26 18:12:22 +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 Regenerate. 2010-08-25 08:45:06 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
Makefile llvmc: remove dynamic plugins. 2010-08-15 07:07:12 +00:00
Makefile.common
Makefile.config.in
Makefile.rules Fix the "Finished Creating" messages for aliases to print the 2010-08-18 01:35:53 +00:00
ModuleInfo.txt
README.txt

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