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swscale: remove if(canMMX2BeUsed) conditional.

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Instead, set function pointers conditionally during init. This
patch also reveals a whole branch of dead assembly code that is
therefore also removed.
This commit is contained in:
Ronald S. Bultje
2011-05-24 12:15:14 -04:00
parent aaca69c130
commit 566b5fbbb3
1 changed files with 8 additions and 91 deletions
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99
libswscale/x86/swscale_template.c
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@@ -1918,19 +1918,11 @@ static inline void RENAME(hScale)(int16_t *dst, int dstW, const uint8_t *src, in
}
}
#define FAST_BILINEAR_X86 \
"subl %%edi, %%esi \n\t" /* src[xx+1] - src[xx] */ \
"imull %%ecx, %%esi \n\t" /* (src[xx+1] - src[xx])*xalpha */ \
"shll $16, %%edi \n\t" \
"addl %%edi, %%esi \n\t" /* src[xx+1]*xalpha + src[xx]*(1-xalpha) */ \
"mov %1, %%"REG_D"\n\t" \
"shrl $9, %%esi \n\t" \
#if COMPILE_TEMPLATE_MMX2
static inline void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
long dstWidth, const uint8_t *src, int srcW,
int xInc)
{
#if COMPILE_TEMPLATE_MMX2
int32_t *filterPos = c->hLumFilterPos;
int16_t *filter = c->hLumFilter;
int canMMX2BeUsed = c->canMMX2BeUsed;
@@ -1939,7 +1931,7 @@ static inline void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
#if defined(PIC)
DECLARE_ALIGNED(8, uint64_t, ebxsave);
#endif
if (canMMX2BeUsed) {
__asm__ volatile(
#if defined(PIC)
"mov %%"REG_b", %5 \n\t"
@@ -1998,51 +1990,12 @@ static inline void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
#endif
);
for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) dst[i] = src[srcW-1]*128;
} else {
#endif /* COMPILE_TEMPLATE_MMX2 */
x86_reg xInc_shr16 = xInc >> 16;
uint16_t xInc_mask = xInc & 0xffff;
x86_reg dstWidth_reg = dstWidth;
//NO MMX just normal asm ...
__asm__ volatile(
"xor %%"REG_a", %%"REG_a" \n\t" // i
"xor %%"REG_d", %%"REG_d" \n\t" // xx
"xorl %%ecx, %%ecx \n\t" // xalpha
".p2align 4 \n\t"
"1: \n\t"
"movzbl (%0, %%"REG_d"), %%edi \n\t" //src[xx]
"movzbl 1(%0, %%"REG_d"), %%esi \n\t" //src[xx+1]
FAST_BILINEAR_X86
"movw %%si, (%%"REG_D", %%"REG_a", 2) \n\t"
"addw %4, %%cx \n\t" //xalpha += xInc&0xFFFF
"adc %3, %%"REG_d" \n\t" //xx+= xInc>>16 + carry
"movzbl (%0, %%"REG_d"), %%edi \n\t" //src[xx]
"movzbl 1(%0, %%"REG_d"), %%esi \n\t" //src[xx+1]
FAST_BILINEAR_X86
"movw %%si, 2(%%"REG_D", %%"REG_a", 2) \n\t"
"addw %4, %%cx \n\t" //xalpha += xInc&0xFFFF
"adc %3, %%"REG_d" \n\t" //xx+= xInc>>16 + carry
"add $2, %%"REG_a" \n\t"
"cmp %2, %%"REG_a" \n\t"
" jb 1b \n\t"
:: "r" (src), "m" (dst), "m" (dstWidth_reg), "m" (xInc_shr16), "m" (xInc_mask)
: "%"REG_a, "%"REG_d, "%ecx", "%"REG_D, "%esi"
);
#if COMPILE_TEMPLATE_MMX2
} //if MMX2 can't be used
#endif
}
static inline void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst,
long dstWidth, const uint8_t *src1,
const uint8_t *src2, int srcW, int xInc)
{
#if COMPILE_TEMPLATE_MMX2
int32_t *filterPos = c->hChrFilterPos;
int16_t *filter = c->hChrFilter;
int canMMX2BeUsed = c->canMMX2BeUsed;
@@ -2051,7 +2004,7 @@ static inline void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst,
#if defined(PIC)
DECLARE_ALIGNED(8, uint64_t, ebxsave);
#endif
if (canMMX2BeUsed) {
__asm__ volatile(
#if defined(PIC)
"mov %%"REG_b", %6 \n\t"
@@ -2101,48 +2054,8 @@ static inline void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst,
dst[i] = src1[srcW-1]*128;
dst[i+VOFW] = src2[srcW-1]*128;
}
} else {
#endif /* COMPILE_TEMPLATE_MMX2 */
x86_reg xInc_shr16 = (x86_reg) (xInc >> 16);
uint16_t xInc_mask = xInc & 0xffff;
x86_reg dstWidth_reg = dstWidth;
__asm__ volatile(
"xor %%"REG_a", %%"REG_a" \n\t" // i
"xor %%"REG_d", %%"REG_d" \n\t" // xx
"xorl %%ecx, %%ecx \n\t" // xalpha
".p2align 4 \n\t"
"1: \n\t"
"mov %0, %%"REG_S" \n\t"
"movzbl (%%"REG_S", %%"REG_d"), %%edi \n\t" //src[xx]
"movzbl 1(%%"REG_S", %%"REG_d"), %%esi \n\t" //src[xx+1]
FAST_BILINEAR_X86
"movw %%si, (%%"REG_D", %%"REG_a", 2) \n\t"
"movzbl (%5, %%"REG_d"), %%edi \n\t" //src[xx]
"movzbl 1(%5, %%"REG_d"), %%esi \n\t" //src[xx+1]
FAST_BILINEAR_X86
"movw %%si, "AV_STRINGIFY(VOF)"(%%"REG_D", %%"REG_a", 2) \n\t"
"addw %4, %%cx \n\t" //xalpha += xInc&0xFFFF
"adc %3, %%"REG_d" \n\t" //xx+= xInc>>16 + carry
"add $1, %%"REG_a" \n\t"
"cmp %2, %%"REG_a" \n\t"
" jb 1b \n\t"
/* GCC 3.3 makes MPlayer crash on IA-32 machines when using "g" operand here,
which is needed to support GCC 4.0. */
#if ARCH_X86_64 && AV_GCC_VERSION_AT_LEAST(3,4)
:: "m" (src1), "m" (dst), "g" (dstWidth_reg), "m" (xInc_shr16), "m" (xInc_mask),
#else
:: "m" (src1), "m" (dst), "m" (dstWidth_reg), "m" (xInc_shr16), "m" (xInc_mask),
#endif
"r" (src2)
: "%"REG_a, "%"REG_d, "%ecx", "%"REG_D, "%esi"
);
#if COMPILE_TEMPLATE_MMX2
} //if MMX2 can't be used
#endif
}
#endif /* COMPILE_TEMPLATE_MMX2 */
#if !COMPILE_TEMPLATE_MMX2
static void updateMMXDitherTables(SwsContext *c, int dstY, int lumBufIndex, int chrBufIndex,
@@ -2240,14 +2153,18 @@ static void RENAME(sws_init_swScale)(SwsContext *c)
c->hScale = RENAME(hScale );
// Use the new MMX scaler if the MMX2 one can't be used (it is faster than the x86 ASM one).
#if COMPILE_TEMPLATE_MMX2
if (c->flags & SWS_FAST_BILINEAR && c->canMMX2BeUsed)
{
c->hyscale_fast = RENAME(hyscale_fast);
c->hcscale_fast = RENAME(hcscale_fast);
} else {
#endif /* COMPILE_TEMPLATE_MMX2 */
c->hyscale_fast = NULL;
c->hcscale_fast = NULL;
#if COMPILE_TEMPLATE_MMX2
}
#endif /* COMPILE_TEMPLATE_MMX2 */
switch(srcFormat) {
case PIX_FMT_YUYV422 : c->chrToYV12 = RENAME(yuy2ToUV); break;