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avcodec/x86/mathops: clip constants used with shift instructions within inline assembly 

Fixes assembling with binutil as >= 2.41

Signed-off-by: James Almer <jamrial@gmail.com>
(cherry picked from commit effadce6c7)
This commit is contained in:
Rémi Denis-Courmont 2023-07-16 18:18:02 +03:00 committed by James Almer
parent cdd355e087
commit 7ef6f317f8
1 changed files with 23 additions and 3 deletions
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26
libavcodec/x86/mathops.h
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@ -35,12 +35,20 @@
static av_always_inline av_const int MULL(int a, int b, unsigned shift)
{
int rt, dummy;
if (__builtin_constant_p(shift))
__asm__ (
"imull %3 \n\t"
"shrdl %4, %%edx, %%eax \n\t"
:"=a"(rt), "=d"(dummy)
:"a"(a), "rm"(b), "ci"((uint8_t)shift)
:"a"(a), "rm"(b), "i"(shift & 0x1F)
);
else
__asm__ (
"imull %3 \n\t"
"shrdl %4, %%edx, %%eax \n\t"
:"=a"(rt), "=d"(dummy)
:"a"(a), "rm"(b), "c"((uint8_t)shift)
);
return rt;
}
@ -113,19 +121,31 @@ __asm__ volatile(\
// avoid +32 for shift optimization (gcc should do that ...)
#define NEG_SSR32 NEG_SSR32
static inline int32_t NEG_SSR32( int32_t a, int8_t s){
if (__builtin_constant_p(s))
__asm__ ("sarl %1, %0\n\t"
: "+r" (a)
: "ic" ((uint8_t)(-s))
: "i" (-s & 0x1F)
);
else
__asm__ ("sarl %1, %0\n\t"
: "+r" (a)
: "c" ((uint8_t)(-s))
);
return a;
}
#define NEG_USR32 NEG_USR32
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
if (__builtin_constant_p(s))
__asm__ ("shrl %1, %0\n\t"
: "+r" (a)
: "ic" ((uint8_t)(-s))
: "i" (-s & 0x1F)
);
else
__asm__ ("shrl %1, %0\n\t"
: "+r" (a)
: "c" ((uint8_t)(-s))
);
return a;
}