touch-packages team mailing list archive

[Andreas Cadhalpun <Andreas.Cadhalpun@xxxxxxxxx>]

A small clarification: the SIMPLE-ARM implementation can also be
selected at runtime, e.g. with the '-idct simplearm' option. That's
mainly useful for debugging purposes, though.

Regarding the binutils bug:
Attached testcase test.S doesn't require compiling ffmpeg, but simply:
$ gcc -g -c -o test.o test.S

Analyzing the difference of 'objdump -d test.o' between variants built
with working and broken binutils show that the working binutils always
always uses 'ldr.w' for ldr, while the broken version sometimes
optimizes this to 'movw', which is a correct alternative, but one time
to 'movt', which only sets half of the register.

** Attachment added: "testcase"
   https://bugs.launchpad.net/ubuntu/+source/ffmpeg/+bug/1513985/+attachment/4516473/+files/test.S

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https://bugs.launchpad.net/bugs/1513985

Title:
  ffmpeg test idct8x8 (SIMPLE-ARM) fails on ARM32 when built with
  binutils from the trunk

Status in binutils:
  Unknown
Status in binutils package in Ubuntu:
  Confirmed
Status in ffmpeg package in Ubuntu:
  Fix Released

Bug description:
  ffmpeg test idct8x8 (NEON) fails on ARM32 when built with binutils
  from the trunk

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