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LLVM backend for 6502
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d2fa781169
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Chris Lattner d2fa781169 Implement the first half of PR3290: if there is a store of an 
integer to a (transitive) bitcast the alloca and if that integer
has the full size of the alloca, then it clobbers the whole thing.
Handle this by extracting pieces out of the stored integer and 
filing them away in the SROA'd elements.

This triggers fairly frequently because the CFE uses integers to
pass small structs by value and the inliner exposes these.  For 
example, in kimwitu++, I see a bunch of these with i64 stores to
"%struct.std::pair<std::_Rb_tree_const_iterator<kc::impl_abstract_phylum*>,bool>"

In 176.gcc I see a few i32 stores to "%struct..0anon".

In the testcase, this is a difference between compiling test1 to:

_test1:
	subl	$12, %esp
	movl	20(%esp), %eax
	movl	%eax, 4(%esp)
	movl	16(%esp), %eax
	movl	%eax, (%esp)
	movl	(%esp), %eax
	addl	4(%esp), %eax
	addl	$12, %esp
	ret

vs:

_test1:
	movl	8(%esp), %eax
	addl	4(%esp), %eax
	ret

The second half of this will be to handle loads of the same form.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61853 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-07 08:11:13 +00:00
autoconf Modify the unittests Makefiles so that they don't rebuild parts of LLVM just to 2009-01-04 23:12:21 +00:00
bindings PR2731: C and Ocaml bindings for setTailCall and isTailCall. 2008-08-30 16:34:54 +00:00
cmake Fix a link issue I ran into trying compiling LLVM on MinGW with CMake. 2008-11-30 02:42:05 +00:00
docs Get rid of the tagging functions and use PointerIntPair. 2009-01-05 16:05:32 +00:00
examples reapply Sanjiv's patch to genericize memcpy/memset/memmove to take an 2008-11-21 16:42:48 +00:00
include The coalescer does not coalesce a virtual register to a physical register if any of the physical register's sub-register live intervals overlaps with the virtual register. This is overly conservative. It prevents a extract_subreg from being coalesced away: 2009-01-07 02:08:57 +00:00
lib Implement the first half of PR3290: if there is a store of an 2009-01-07 08:11:13 +00:00
projects Add "sample" documentation to sample project. 2008-09-15 05:31:29 +00:00
runtime Fixing the stack walker. 2008-01-24 05:16:36 +00:00
test Implement the first half of PR3290: if there is a store of an 2009-01-07 08:11:13 +00:00
tools make llvm-ld smart enough to link against native libraries that are 2009-01-05 19:01:32 +00:00
unittests Modify the unittests Makefiles so that they don't rebuild parts of LLVM just to 2009-01-04 23:12:21 +00:00
utils Improve support for type-generic vector intrinsics by teaching TableGen how 2009-01-07 00:09:01 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
win32 Rename AddReadAttrs to FunctionAttrs, and teach it how 2008-12-31 16:14:43 +00:00
Xcode Remove Stacker.html from Xcode project. 2008-10-14 23:23:59 +00:00
build-for-llvm-top.sh Allow the configure options to be set according to the llvm-top options. 2007-08-31 19:53:42 +00:00
CMakeLists.txt CMake: Option for building with -fPIC. 2008-11-20 19:13:51 +00:00
configure Regenerate. 2009-01-04 23:12:30 +00:00
CREDITS.TXT Keep CREDITS.TXT sorted by name. 2008-11-07 12:44:36 +00:00
LICENSE.TXT Renamed Google Test license file from COPYING to LICENSE.TXT to match LLVM 2009-01-05 17:42:15 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
Makefile Modify the unittests Makefiles so that they don't rebuild parts of LLVM just to 2009-01-04 23:12:21 +00:00
Makefile.common remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.config.in Use spaces rather than tab. 2008-10-22 09:42:14 +00:00
Makefile.rules Modify the unittests Makefiles so that they don't rebuild parts of LLVM just to 2009-01-04 23:12:21 +00:00
ModuleInfo.txt Update to include clean and install commands. 2007-07-20 20:54:41 +00:00
README.txt Remove extra lines 2008-07-28 20:50:25 +00:00

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