[LLVMbugs] [Bug 2311] LLVM codegen unnecessarily realigns stack for x86 SSE code

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sun May 11 07:29:06 PDT 2008


Anton Korobeynikov <asl at math.spbu.ru> changed:

           What    |Removed                     |Added
                 CC|                            |evan.cheng at apple.com,
                   |                            |asl at math.spbu.ru
             Status|NEW                         |RESOLVED
         Resolution|                            |LATER

--- Comment #1 from Anton Korobeynikov <asl at math.spbu.ru>  2008-05-11 09:29:06 ---
Unfortunately, we need to know about stack alignment too early, before RA runs.
At that point we don't know, whether there will be vector spill, or not. Stack
realignment logic is overly conservative here, but otherwise we can produce
unaligned loads/stores.

Fixing this will require some huge RA changes.

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