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view decoders/libmpg123/decode_i586_dither.S @ 562:7e08477b0fc1

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MP3 decoder upgrade work. Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123. libmpg123 is a much better version of mpglib, so it should solve all the problems about MP3's not seeking, or most modern MP3's not playing at all, etc. Since you no longer have to make a tradeoff with SMPEG for features, and SMPEG is basically rotting, I removed it from the project. There is still work to be done with libmpg123...there are MMX, 3DNow, SSE, Altivec, etc decoders which we don't have enabled at the moment, and the build system could use some work to make this compile more cleanly, etc. Still: huge win.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Jan 2009 02:44:47 -0500
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/*
	decode_i586_dither: asm synth with dither noise

	copyright ?-2007 by the mpg123 project - free software under the terms of the LGPL 2.1
	see COPYING and AUTHORS files in distribution or http://mpg123.org
	initially written by Stefan Bieschewski as decode_i586.s without dither

	This version uses "circular" 64k dither noise.
	(Patch by Adrian <adrian.bacon@xs4all.nl>)

	Thomas learned something about assembler and the stack while making this one thread safe (removing static data).
*/

#include "mangle.h"

.data
#ifndef __APPLE__
		.section	.rodata
#endif
	ALIGN8
.LC0:
	.long 0x0,0x40dfffc0
	ALIGN8
.LC1:
	.long 0x0,0xc0e00000
	ALIGN8
.text
/* int synth_1to1_i586_asm_dither(real *bandPtr, int channel, unsigned char *out, unsigned char *buffs, int bo_and_ditherindex[2], real *decwin); */
.globl ASM_NAME(synth_1to1_i586_asm_dither)
ASM_NAME(synth_1to1_i586_asm_dither):
	subl $16,%esp
	pushl %ebp
	pushl %edi
	pushl %esi
	pushl %ebx
/* stack: 0(%esp)=%ebx 4=esi 8=edi 12=ebp 16,20,24,28=local 32=back 36=bandptr 40=channel 44=out 48=buffs 52=bo 56=decwin */
#define BANDPTR 36(%esp)
#define CHANNEL 40(%esp)
#define OUT     44(%esp)
#define BUFFS   48(%esp)
#define BO      52(%esp)
#define DECWIN  56(%esp)
#define LOC0    16(%esp)
#define LOC1    20(%esp)
#define LOC2    24(%esp)
#define DITHERINDEX  28(%esp)
	movl BANDPTR,%eax
	movl OUT,%esi
	movl BO, %ebx
	movl (%ebx),%ebp    /* get bo value */
	movl 4(%ebx),%edi;  /* get the ditherindex behind bo */
	movl %edi,DITHERINDEX
	xorl %edi,%edi
	cmpl %edi,CHANNEL
	jne .L48
	decl %ebp
	andl $15,%ebp
	movl %ebp,(%ebx)   /* save bo back */
	movl BUFFS,%ecx
	jmp .L49
.L48:
/*       In stereo mode , "rewind" dither pointer 32 samples , so 2nd channel */
/*       has same dither values. Tested OK for mono and stereo MP2 and MP3 */
	subl $128,DITHERINDEX /* better move to %edi for the two calculations? */
	andl $0x0003fffc,DITHERINDEX
	addl $2,%esi
	movl BUFFS,%ecx
	addl $2176,%ecx
.L49:
/* now the call of dct64 is prepared, stuff pushed to the stack, but soon after it's removed again */
	testl $1,%ebp
	je .L50
	movl %ecx,%ebx
	movl %ebp,LOC0
	pushl %eax
	movl LOC1,%edx
	leal (%ebx,%edx,4),%eax
	pushl %eax
	movl LOC2,%eax
	incl %eax
	andl $15,%eax
	leal 1088(,%eax,4),%eax
	addl %ebx,%eax
	jmp .L74
.L50:
	leal 1088(%ecx),%ebx
	leal 1(%ebp),%edx
	movl %edx,LOC0
	pushl %eax
	leal 1092(%ecx,%ebp,4),%eax
	pushl %eax
	leal (%ecx,%ebp,4),%eax
.L74:
	pushl %eax
	call ASM_NAME(dct64_i386)
	addl $12,%esp
/* Now removed the parameters.
   stack: 0(%esp)=%ebx 4=esi 8=edi 12=ebp 16,20,24,28=local 32=back 36=bandptr 40=channel 44=out 48=buffs 52=bo */
	movl LOC0,%edx
	leal 0(,%edx,4),%edx
	/* movl $ASM_NAME(decwin)+64,%eax */
	movl DECWIN,%eax
	addl $64,%eax
	movl %eax,%ecx
	subl %edx,%ecx
	movl $16,%ebp
.L55:
	flds (%ecx)
	fmuls (%ebx)
	flds 4(%ecx)
	fmuls 4(%ebx)
	fxch %st(1)
	flds 8(%ecx)
	fmuls 8(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 12(%ecx)
	fmuls 12(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 16(%ecx)
	fmuls 16(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 20(%ecx)
	fmuls 20(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 24(%ecx)
	fmuls 24(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 28(%ecx)
	fmuls 28(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 32(%ecx)
	fmuls 32(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 36(%ecx)
	fmuls 36(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 40(%ecx)
	fmuls 40(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 44(%ecx)
	fmuls 44(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 48(%ecx)
	fmuls 48(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 52(%ecx)
	fmuls 52(%ebx)
	fxch %st(2)         
	faddp %st,%st(1)
	flds 56(%ecx)
	fmuls 56(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds 60(%ecx)
	fmuls 60(%ebx)
	fxch %st(2)
	subl $4,%esp
	faddp %st,%st(1)
	fxch %st(1)
	fsubrp %st,%st(1)

	addl $4,DITHERINDEX
	andl $0x0003fffc,DITHERINDEX
	movl $ASM_NAME(dithernoise),%edi
	addl DITHERINDEX,%edi	

	fadd (%edi)

/* fistpl and popl as a unit keep the stack unchanged */
	fistpl (%esp)
	popl %eax
	cmpl $32767,%eax
	jg 1f
	cmpl $-32768,%eax
	jl 2f
	movw %ax,(%esi)
	jmp 4f
1:	movw $32767,(%esi)
	jmp 3f
2:	movw $-32768,(%esi)
3:
/*	incl %edi */
4:
.L54:
	addl $64,%ebx
	subl $-128,%ecx
	addl $4,%esi
	decl %ebp
	jnz .L55
	flds (%ecx)
	fmuls (%ebx)
	flds 8(%ecx)
	fmuls 8(%ebx)
	flds 16(%ecx)
	fmuls 16(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 24(%ecx)
	fmuls 24(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 32(%ecx)
	fmuls 32(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 40(%ecx)
	fmuls 40(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 48(%ecx)
	fmuls 48(%ebx)
	fxch %st(2)
	faddp %st,%st(1)
	flds 56(%ecx)
	fmuls 56(%ebx)
	fxch %st(2)
	subl $4,%esp
	faddp %st,%st(1)
	fxch %st(1)
	faddp %st,%st(1)

	addl $4,DITHERINDEX
	andl $0x0003fffc,DITHERINDEX
	movl $ASM_NAME(dithernoise),%edi
	addl DITHERINDEX,%edi	

	fadd (%edi)
/* fistpl and popl as a unit keep the stack unchanged */
	fistpl (%esp)
	popl %eax
	cmpl $32767,%eax
	jg 1f
	cmpl $-32768,%eax
	jl 2f
	movw %ax,(%esi)
	jmp 4f
1:	movw $32767,(%esi)
	jmp 3f
2:	movw $-32768,(%esi)
3:
/*	incl %edi */
4:
.L62:
	addl $-64,%ebx
	addl $4,%esi
	movl LOC0,%edx
	leal -128(%ecx,%edx,8),%ecx
	movl $15,%ebp
.L68:
	flds -4(%ecx)
	fchs
	fmuls (%ebx)
	flds -8(%ecx)
	fmuls 4(%ebx)
	fxch %st(1)
	flds -12(%ecx)
	fmuls 8(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -16(%ecx)
	fmuls 12(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -20(%ecx)
	fmuls 16(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -24(%ecx)
	fmuls 20(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -28(%ecx)
	fmuls 24(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -32(%ecx)
	fmuls 28(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -36(%ecx)
	fmuls 32(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -40(%ecx)
	fmuls 36(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -44(%ecx)
	fmuls 40(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -48(%ecx)
	fmuls 44(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -52(%ecx)
	fmuls 48(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -56(%ecx)
	fmuls 52(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds -60(%ecx)
	fmuls 56(%ebx)
	fxch %st(2)
	fsubrp %st,%st(1)
	flds (%ecx)
	fmuls 60(%ebx)
	fxch %st(2)
	subl $4,%esp
	fsubrp %st,%st(1)
	fxch %st(1)
	fsubrp %st,%st(1)

	addl $4,DITHERINDEX
	andl $0x0003fffc,DITHERINDEX
	movl $ASM_NAME(dithernoise),%edi
	addl DITHERINDEX,%edi	

	fadd (%edi)
/* fistpl and popl as a unit keep the stack unchanged */
	fistpl (%esp)
	popl %eax
	cmpl $32767,%eax
	jg 1f
	cmpl $-32768,%eax
	jl 2f
	movw %ax,(%esi)
	jmp 4f
1:	movw $32767,(%esi)
	jmp 3f
2:	movw $-32768,(%esi)
3:
/*	incl %edi */
4:
.L67:
	addl $-64,%ebx
	addl $-128,%ecx
	addl $4,%esi
	decl %ebp
	jnz .L68
/* return ipv edi 0 in eax */
	movl $0,%eax
/* save ditherindex */
	movl BO,%ebx
	movl DITHERINDEX,%esi
	movl %esi,4(%ebx);
/* stack: 0=ebx 4=esi 8=edi 12=ebp 16,20,24,28=local 32=back 36=bandptr 40=channel 44=out 48=buffs 52=bo */
	popl %ebx
	popl %esi
	popl %edi
	popl %ebp
	addl $16,%esp
/* The stack must be now: 0=back 4=bandptr 8=channel 12=out 16=buffs 20=bo */
	ret

/* Mark non-executable stack. */
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits
#endif