Chris Lattner b3f0673d52 Teach valuetracking that byval arguments with a specified alignment are ... aligned. Teach memcpyopt to not give up all hope when confonted with an underaligned memcpy feeding an overaligned byval. If the *source* of the memcpy can be determined to be adequeately aligned, or if it can be forced to be, we can eliminate the memcpy. This addresses PR9794. We now compile the example into: define i32 @f(%struct.p* nocapture byval align 8 %q) nounwind ssp { entry: %call = call i32 @g(%struct.p* byval align 8 %q) nounwind ret i32 %call } in both x86-64 and x86-32 mode. We still don't get a tailcall though, because tailcalls apparently can't handle byval. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131884 91177308-0d34-0410-b5e6-96231b3b80d8		2011-05-23 00:03:39 +00:00
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Analysis	Teach valuetracking that byval arguments with a specified alignment are	2011-05-23 00:03:39 +00:00
Archive	Revert PathV2 changes, as sys::fs::unique_file is not finished yet.	2011-03-01 19:50:55 +00:00
AsmParser	Remove unused variables caught by GCC's -Wunused-but-set-variable.	2011-05-03 16:00:27 +00:00
Bitcode	It's valid to take the blockaddress of a different function, so remove this	2011-05-06 21:09:44 +00:00
CodeGen	Eliminate some temporary variables, and don't call getByValTypeAlignment	2011-05-22 23:23:02 +00:00
CompilerDriver	Build CompilerDriver library.	2011-03-12 22:01:42 +00:00
ExecutionEngine	Avoid a Twine that referenced a tmp (which proceded to go out of scope before	2011-05-19 00:45:05 +00:00
Linker	Set the unnamed_addr only when we're creating a new GV in the dest module.	2011-03-29 23:31:06 +00:00
MC	Add methods to parse the SEH directives to the COFFAsmParser. Implement some	2011-05-22 21:12:15 +00:00
Object	Remove dead variable pointed out by GCC 4.6 warnings, and reflow this a little	2011-05-02 05:05:29 +00:00
Support	fix a bug for hosts without round, PR8893.	2011-05-22 06:03:53 +00:00
Target	add a missing alias to make us more bug compatible with gcc, PR9378	2011-05-22 22:31:57 +00:00
Transforms	Teach valuetracking that byval arguments with a specified alignment are	2011-05-23 00:03:39 +00:00
VMCore	add a helper method to get the byval alignment of an argument.	2011-05-22 23:57:23 +00:00
CMakeLists.txt	Build CompilerDriver library.	2011-03-12 22:01:42 +00:00
Makefile	Add LLVMObject Library.	2010-11-15 03:21:41 +00:00