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[Bug gas/19217] [2.26 Regression] ffmpeg test idct8x8 (NEON) fails on AR

From: doko at debian dot org
Subject: [Bug gas/19217] [2.26 Regression] ffmpeg test idct8x8 (NEON) fails on ARM32 when built with binutils from the trunk
Date: Tue, 10 Nov 2015 22:59:08 +0000


--- Comment #4 from Matthias Klose <doko at debian dot org> ---
Created attachment 8774
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8774&action=edit
test case

from https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1513985/comments/3

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."

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