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avcodec/x86/vc1: guard usage of undefined functions with preprocessor

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The asumption is that DCE will remove references to those functions.
However some compilers with certain instrumentation enabled doesn't DCE
those at all, resulting in linking failure. Tested with cl.exe -RTCu -RTCs.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
This commit is contained in:
Kacper Michajłow
2025-07-21 01:44:02 +02:00
parent 9658d4425e
commit 40b56c6536
2 changed files with 6 additions and 0 deletions
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4
libavcodec/x86/vc1dsp.h
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@ -23,7 +23,11 @@
#include "libavcodec/vc1dsp.h"
#if HAVE_6REGS && HAVE_INLINE_ASM && HAVE_MMX_EXTERNAL
void ff_vc1dsp_init_mmx(VC1DSPContext *dsp);
void ff_vc1dsp_init_mmxext(VC1DSPContext *dsp);
#endif /* HAVE_6REGS && HAVE_INLINE_ASM && HAVE_MMX_EXTERNAL */
#endif /* AVCODEC_X86_VC1DSP_H */

2
libavcodec/x86/vc1dsp_init.c
View File

@ -102,6 +102,7 @@ av_cold void ff_vc1dsp_init_x86(VC1DSPContext *dsp)
{
int cpu_flags = av_get_cpu_flags();
#if HAVE_6REGS && HAVE_INLINE_ASM && HAVE_MMX_EXTERNAL
if (HAVE_6REGS && INLINE_MMX(cpu_flags))
if (EXTERNAL_MMX(cpu_flags))
ff_vc1dsp_init_mmx(dsp);
@ -109,6 +110,7 @@ av_cold void ff_vc1dsp_init_x86(VC1DSPContext *dsp)
if (HAVE_6REGS && INLINE_MMXEXT(cpu_flags))
if (EXTERNAL_MMXEXT(cpu_flags))
ff_vc1dsp_init_mmxext(dsp);
#endif /* HAVE_6REGS && HAVE_INLINE_ASM && HAVE_MMX_EXTERNAL */
#define ASSIGN_LF4(EXT) \
dsp->vc1_v_loop_filter4 = ff_vc1_v_loop_filter4_ ## EXT; \