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arm: Macroize the test for 'setend' CPU instruction support

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Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Ben Avison 2014-07-21 14:53:06 +01:00 committed by Diego Biurrun
parent 16e6652286
commit 6869612f5c
2 changed files with 7 additions and 5 deletions
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6
libavcodec/arm/h264dsp_init_arm.c
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@ -104,12 +104,8 @@ 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) && !(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.
if (have_setend(cpu_flags))
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);
}

6
libavutil/arm/cpu.h
View File

@ -30,4 +30,10 @@
#define have_vfpv3(flags) CPUEXT(flags, VFPV3)
#define have_neon(flags) CPUEXT(flags, NEON)
/* Some functions use the 'setend' instruction which is deprecated on ARMv8
* and serializing on some ARMv7 cores. This macro ensures such functions
* are only enabled on ARMv6. */
#define have_setend(flags) \
(have_armv6(flags) && !(have_vfpv3(flags) || have_neon(flags)))
#endif /* AVUTIL_ARM_CPU_H */