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| author | Peter Bergner <bergner@linux.ibm.com> | 2020-11-06 17:00:49 -0600 |
|---|---|---|
| committer | Peter Bergner <bergner@linux.ibm.com> | 2020-11-06 17:01:18 -0600 |
| commit | a37b5bcf15a682f22ac10d8b7069aa8d115caaef (patch) | |
| tree | 1cd51135243b153c9e24ad2600f41c995c728f75 /gcc/ada/gcc-interface/misc.c | |
| parent | 659ba632e440280e8d61e1ae870e917765db5ae5 (diff) | |
| download | gcc-a37b5bcf15a682f22ac10d8b7069aa8d115caaef.zip gcc-a37b5bcf15a682f22ac10d8b7069aa8d115caaef.tar.gz gcc-a37b5bcf15a682f22ac10d8b7069aa8d115caaef.tar.bz2 | |
rs6000: Fix default alignment ABI break caused by MMA base support
As part of the MMA base support, we incremented BIGGEST_ALIGNMENT in
order to align the __vector_pair and __vector_quad types to 256 and 512
bytes respectively. This had the unintended effect of changing the
default alignment used by __attribute__ ((__aligned__)) which causes
an ABI break because of some dodgy code in GLIBC's struct pthread.
The fix is to revert the BIGGEST_ALIGNMENT change and to force the
alignment on the type itself rather than the mode used by the type.
2020-11-06 Peter Bergner <bergner@linux.ibm.com>
gcc/
* config/rs6000/rs6000.h (BIGGEST_ALIGNMENT): Revert previous commit
so as not to break the ABI.
* config/rs6000/rs6000-call.c (rs6000_init_builtins): Set the ABI
mandated alignment for __vector_pair and __vector_quad types.
gcc/testsuite/
* gcc.target/powerpc/mma-alignment.c: New test.
Diffstat (limited to 'gcc/ada/gcc-interface/misc.c')
0 files changed, 0 insertions, 0 deletions