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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2008-02-24-MultipleUseofSRet.ll
2008-03-13-ReturnSlotBitcast.ll
align.ll
crash.ll
dg.exp
form-memset.ll
loadstore-sret.ll
memcpy-to-memset.ll
memcpy.ll
memmove.ll
smaller.ll
sret.ll