[cfe-commits] Alignment of return from __builtin_alloca

David Sehr sehr at google.com
Thu Jun 7 14:57:16 PDT 2012


So the interesting case is where stackAlignment < SuitableAlignment.
Would it be reasonable with you to align to the minimum of those two?


On Thu, Jun 7, 2012 at 2:40 PM, Joerg Sonnenberger
<joerg at britannica.bec.de> wrote:
> On Thu, Jun 07, 2012 at 02:23:13PM -0700, David Sehr wrote:
>> I have recently been debugging a failure with one of the tests from
>> the gcc torture test suite and discovered that gcc and llvm seem to
>> differ on whether __builtin_alloca is aligned more than 0mod4 (gcc
>> thinks it's aligned by what clang stores inTargetInfo::SuitableAlign).
> It should ensure that the stack alignment invariance from the ABI is
> honored. I don't think it should provide a stricter alignment.
> Please be very careful when changing this to not violate the above.
> Joerg
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