src/audio/SDL_mixer_MMX.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 09 Nov 2002 06:13:28 +0000
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child 887 b4b64bb88f2f
permissions -rw-r--r--
Added MMX audio mixing code for gcc (thanks Stephane!)
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// MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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// Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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// This code is licensed under the LGPL (see COPYING for details)
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// 
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// Assumes buffer size in bytes is a multiple of 16
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// Assumes SDL_MIX_MAXVOLUME = 128
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////////////////////////////////////////////////
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// Mixing for 16 bit signed buffers
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////////////////////////////////////////////////
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#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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{
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    __asm__ __volatile__ (
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"	movl %0,%%edi\n"	// edi = dst
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"	movl %1,%%esi\n"	// esi = src
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"	movl %3,%%eax\n"	// eax = volume
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"	movl %2,%%ebx\n"	// ebx = size
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"	shrl $4,%%ebx\n"	// process 16 bytes per iteration = 8 samples
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"	jz .endS16\n"
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"	pxor %%mm0,%%mm0\n"
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"	movd %%eax,%%mm0\n"
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"	movq %%mm0,%%mm1\n"
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"	psllq $16,%%mm0\n"
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"	por %%mm1,%%mm0\n"
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"	psllq $16,%%mm0\n"
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"	por %%mm1,%%mm0\n"
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"	psllq $16,%%mm0\n"
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"	por %%mm1,%%mm0\n"		// mm0 = vol|vol|vol|vol
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".align 16\n"
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"	.mixloopS16:\n"
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"	movq (%%esi),%%mm1\n" // mm1 = a|b|c|d
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"	movq %%mm1,%%mm2\n" // mm2 = a|b|c|d
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"	movq 8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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	// pré charger le buffer dst dans mm7
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"	movq (%%edi),%%mm7\n" // mm7 = dst[0]"
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	// multiplier par le volume
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"	pmullw %%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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"	pmulhw %%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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"	movq %%mm4,%%mm5\n" // mm5 = e|f|g|h
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"	pmullw %%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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"	pmulhw %%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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"	movq %%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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"	punpckhwd %%mm2,%%mm1\n" // mm1 = a*v|b*v
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"	movq %%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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"	punpcklwd %%mm2,%%mm3\n" // mm3 = c*v|d*v
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"	punpckhwd %%mm5,%%mm4\n" // mm4 = e*f|f*v
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"	punpcklwd %%mm5,%%mm6\n" // mm6 = g*v|h*v
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	// pré charger le buffer dst dans mm5
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"	movq 8(%%edi),%%mm5\n" // mm5 = dst[1]
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	// diviser par 128
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"	psrad $7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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"	addl $16,%%esi\n"
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"	psrad $7,%%mm3\n" // mm3 = c*v/128|d*v/128
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"	psrad $7,%%mm4\n" // mm4 = e*v/128|f*v/128
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	// mm1 = le sample avec le volume modifié
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"	packssdw %%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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"	psrad $7,%%mm6\n" // mm6= g*v/128|h*v/128
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"	paddsw %%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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	// mm4 = le sample avec le volume modifié
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"	packssdw %%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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"	movq %%mm3,(%%edi)\n"
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"	paddsw %%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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"	movq %%mm6,8(%%edi)\n"
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"	addl $16,%%edi\n"
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"	dec %%ebx\n"
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"	jnz .mixloopS16\n"
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"	emms\n"
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".endS16:\n"
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	 :
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	 : "m" (dst), "m"(src),"m"(size),
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	 "m"(volume)
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	 : "eax","ebx", "esi", "edi","memory"
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	 );
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}
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////////////////////////////////////////////////
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// Mixing for 8 bit signed buffers
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////////////////////////////////////////////////
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void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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{
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    __asm__ __volatile__ (
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"	movl %0,%%edi\n"	// edi = dst
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"	movl %1,%%esi\n"	// esi = src
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"	movl %3,%%eax\n"	// eax = volume
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"	movd %%ebx,%%mm0\n"
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"	movq %%mm0,%%mm1\n"
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"	psllq $16,%%mm0\n"
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"	por %%mm1,%%mm0\n"
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"	psllq $16,%%mm0\n"
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"	por %%mm1,%%mm0\n"
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"	psllq $16,%%mm0\n"
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"	por %%mm1,%%mm0\n"
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"	movl %2,%%ebx\n"	// ebx = size
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"	shr $3,%%ebx\n"	// process 8 bytes per iteration = 8 samples
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"	cmp $0,%%ebx\n"
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"	je .endS8\n"
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".align 16\n"
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"	.mixloopS8:\n"
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"	pxor %%mm2,%%mm2\n"		// mm2 = 0
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"	movq (%%esi),%%mm1\n"	// mm1 = a|b|c|d|e|f|g|h
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"	movq %%mm1,%%mm3\n" 	// mm3 = a|b|c|d|e|f|g|h
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	// on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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"	pcmpgtb %%mm1,%%mm2\n"	// mm2 = 11111111|00000000|00000000....
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"	punpckhbw %%mm2,%%mm1\n"	// mm1 = 0|a|0|b|0|c|0|d
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"	punpcklbw %%mm2,%%mm3\n"	// mm3 = 0|e|0|f|0|g|0|h
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"	movq (%%edi),%%mm2\n"	// mm2 = destination
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"	pmullw %%mm0,%%mm1\n"	// mm1 = v*a|v*b|v*c|v*d
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"	addl $8,%%esi\n"
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"	pmullw %%mm0,%%mm3\n"	// mm3 = v*e|v*f|v*g|v*h
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"	psraw $7,%%mm1\n"		// mm1 = v*a/128|v*b/128|v*c/128|v*d/128 
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"	psraw $7,%%mm3\n"		// mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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"	packsswb %%mm1,%%mm3\n"	// mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128
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"	paddsb %%mm2,%%mm3\n"	// add to destination buffer
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"	movq %%mm3,(%%edi)\n"	// store back to ram
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"	addl $8,%%edi\n"
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"	dec %%ebx\n"
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"	jnz .mixloopS8\n"
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".endS8:\n"
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"	emms\n"
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	 :
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	 : "m" (dst), "m"(src),"m"(size),
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	 "m"(volume)
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	 : "eax","ebx", "esi", "edi","memory"
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	 );
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}
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#endif
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