Opened 5 years ago

Last modified 14 months ago

#7665 new defect

DJGPP: alignment silently reduced to 16 bytes with questionable reason

Reported by: michael.kostylev Owned by:
Priority: important Component: avutil
Version: git-master Keywords: djgpp regression
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Summary of the bug:

Commit 1473afac5d11a0a90810b6cd8107d63640c9fd38 actually broke the
AVX code when the compiler is able to build it. The vast majority of the DJGPP toolchains are unable to maintain even the 16-byte alingment, so the only good workaround for such a toolchain is to use --disable-sse. That in turn could be a a good reason for relaxing alignment requirements.

How to reproduce:

See http://fate.xffm.org/report.cgi?slot=x86_32-freedos-gcc-4.8-avx2&time=20190105220055
The code 255 (SIGSEGV, actually) is caused by reduced alignment, the rest looks as dosemu-related.

Change History (2)

comment:1 by Carl Eugen Hoyos, 5 years ago

Keywords: djgpp regression added
Priority: normal → important
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