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arm: Avoid using the 'setend' instruction on ARMv7 and newer

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This instruction is deprecated on ARMv8, and it is serializing on
some ARMv7 cores as well [1].

[1] http://article.gmane.org/gmane.linux.ports.arm.kernel/339293

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-07-04 18:21:50 +03:00
parent 3d90f27ad5
commit 79fce1ec8a
1 changed files with 5 additions and 1 deletions
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6
libavcodec/arm/h264dsp_init_arm.c
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@ -104,8 +104,12 @@ av_cold void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth,
{
int cpu_flags = av_get_cpu_flags();
if (have_armv6(cpu_flags))
if (have_armv6(cpu_flags) && !(have_vfpv3(cpu_flags) || have_neon(cpu_flags))) {
// This function uses the 'setend' instruction which is deprecated
// on ARMv8. This instruction is serializing on some ARMv7 cores as
// well. Therefore, only use the function on ARMv6.
c->h264_find_start_code_candidate = ff_h264_find_start_code_candidate_armv6;
}
if (have_neon(cpu_flags))
h264dsp_init_neon(c, bit_depth, chroma_format_idc);
}