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BIGGEST_ALIGNMENT vs g++ compat test expectation on aix ?
- From: Olivier Hainque <hainque at adacore dot com>
- To: gcc at gcc dot gnu dot org
- Cc: hainque at adacore dot com
- Date: Mon, 29 Jun 2009 15:59:15 +0200
- Subject: BIGGEST_ALIGNMENT vs g++ compat test expectation on aix ?
Working on a collect2 related patch resubmission for ppc-aix, I
stumbled on regressions in the c++ series for a problem unrelated to
my change. Not sure how you'd typically deal with these, so providing
the datapoints here.
tmpdir-g++.dg-struct-layout-1/t027 and a couple of other tests failed
from constructs like
struct S2661 {
union{v16sf b[31];Tal2short c __attribute__((aligned (4)));}a;
float d;
};
struct S2661 s2661;
struct S2661 a2661[5];
info.als = __alignof__ (s2661);
if (&a2661[3] & (info.als - 1)) FAIL ...
the alignment check is up to that of v16sf (64bytes), and this
occasionaly fails because csects are "only" aligned in accordance with
rs6000.h:#define BIGGEST_ALIGNMENT 128
The discrepancy is visible straight from the assembly output
for e.g. t027_y (out of the unchanged compiler as well):
.csect .data[RW],4
^^^
.align 6
^^^
a2661:
.space 10240
Olivier