Chris Lattner 8adf14ea21 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. llvm-svn: 61853		2009-01-07 08:11:13 +00:00
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Analysis	When checking if an Argument escapes, check if	2009-01-05 21:19:53 +00:00
Archive	Tidy up #includes, deleting a bunch of unnecessary #includes.	2009-01-05 17:59:02 +00:00
AsmParser	fix wordo	2009-01-05 18:56:52 +00:00
Bitcode	revert r61368.	2008-12-23 05:43:56 +00:00
CodeGen	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
Debugger	Tidy up #includes, deleting a bunch of unnecessary #includes.	2009-01-05 17:59:02 +00:00
ExecutionEngine	Tidy up #includes, deleting a bunch of unnecessary #includes.	2009-01-05 17:59:02 +00:00
Linker	Make comments and code for QuietWarnings and QuietErrors	2008-10-25 17:57:20 +00:00
Support	Tweak --version to include the date and time.	2008-12-23 18:41:47 +00:00
System	Don't use plain %x to print pointer values. I had changed it from %p	2008-12-05 23:39:24 +00:00
Target	Add patterns to match conditional moves with loads folded	2009-01-07 01:00:24 +00:00
Transforms	Implement the first half of PR3290: if there is a store of an	2009-01-07 08:11:13 +00:00
VMCore	Improve support for type-generic vector intrinsics by teaching TableGen how	2009-01-07 00:09:01 +00:00
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