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
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Analysis	Don't try to analyze this "backward" case. This is overly conservative	2009-01-02 18:54:17 +00:00
Archive
Assembler	Don't spew bitcode to standard out if this test	2009-01-05 10:52:29 +00:00
Bindings/Ocaml
Bitcode
BugPoint
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
DebugInfo	This test passes again, unXFAIL.	2009-01-05 09:30:47 +00:00
ExecutionEngine
Feature
FrontendAda
FrontendC	Strength test.	2009-01-05 21:27:59 +00:00
FrontendC++
FrontendFortran
FrontendObjC
FrontendObjC++
Integer	alignment of 0 is not valid.	2009-01-05 08:14:35 +00:00
lib
Linker
LLVMC
Other
Scripts
TableGen
Transforms	Implement the first half of PR3290: if there is a store of an	2009-01-07 08:11:13 +00:00
Verifier
Makefile
Makefile.tests
TestRunner.sh