376 lines
7.1 KiB
ArmAsm
376 lines
7.1 KiB
ArmAsm
/*
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decode_i586_dither: asm synth with dither noise
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copyright ?-2007 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Stefan Bieschewski as decode_i586.s without dither
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This version uses "circular" 64k dither noise.
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(Patch by Adrian <adrian.bacon@xs4all.nl>)
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Thomas learned something about assembler and the stack while making this one thread safe (removing static data).
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*/
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#include "mangle.h"
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.data
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#ifndef __APPLE__
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.section .rodata
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#endif
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ALIGN8
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.LC0:
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.long 0x0,0x40dfffc0
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ALIGN8
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.LC1:
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.long 0x0,0xc0e00000
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ALIGN8
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.text
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/* int synth_1to1_i586_asm_dither(real *bandPtr, int channel, unsigned char *out, unsigned char *buffs, int bo_and_ditherindex[2], real *decwin, real* dithernoise); */
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.globl ASM_NAME(synth_1to1_i586_asm_dither)
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ASM_NAME(synth_1to1_i586_asm_dither):
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subl $16,%esp
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pushl %ebp
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pushl %edi
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pushl %esi
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pushl %ebx
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/* 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 60=dithernoise */
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#define BANDPTR 36(%esp)
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#define CHANNEL 40(%esp)
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#define OUT 44(%esp)
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#define BUFFS 48(%esp)
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#define BO 52(%esp)
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#define DECWIN 56(%esp)
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#define DITHERNOISE 60(%esp)
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/*#define DITHERNOISE $(ASM_NAME(dithernoise))*/
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#define LOC0 16(%esp)
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#define LOC1 20(%esp)
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#define LOC2 24(%esp)
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#define DITHERINDEX 28(%esp)
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/* During application of the dithering, we need the shifted locations because there's an additional value on the stack. */
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#define DITHERNOISE2 64(%esp)
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#define DITHERINDEX2 32(%esp)
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movl BANDPTR,%eax
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movl OUT,%esi
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movl BO, %ebx
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movl (%ebx),%ebp /* get bo value */
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movl 4(%ebx),%edi; /* get the ditherindex behind bo */
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movl %edi,DITHERINDEX
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xorl %edi,%edi
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cmpl %edi,CHANNEL
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jne .L48
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decl %ebp
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andl $15,%ebp
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movl %ebp,(%ebx) /* save bo back */
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movl BUFFS,%ecx
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jmp .L49
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.L48:
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/* In stereo mode , "rewind" dither pointer 32 samples , so 2nd channel */
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/* has same dither values. Tested OK for mono and stereo MP2 and MP3 */
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subl $128,DITHERINDEX /* better move to %edi for the two calculations? */
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andl $0x0003fffc,DITHERINDEX
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addl $2,%esi
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movl BUFFS,%ecx
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addl $2176,%ecx
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.L49:
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/* now the call of dct64 is prepared, stuff pushed to the stack, but soon after it's removed again */
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testl $1,%ebp
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je .L50
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movl %ecx,%ebx
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movl %ebp,LOC0
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pushl %eax
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movl LOC1,%edx
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leal (%ebx,%edx,4),%eax
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pushl %eax
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movl LOC2,%eax
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incl %eax
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andl $15,%eax
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leal 1088(,%eax,4),%eax
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addl %ebx,%eax
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jmp .L74
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.L50:
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leal 1088(%ecx),%ebx
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leal 1(%ebp),%edx
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movl %edx,LOC0
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pushl %eax
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leal 1092(%ecx,%ebp,4),%eax
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pushl %eax
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leal (%ecx,%ebp,4),%eax
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.L74:
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pushl %eax
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call ASM_NAME(dct64_i386)
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addl $12,%esp
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/* Now removed the parameters.
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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 60=dithernoise */
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movl LOC0,%edx
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leal 0(,%edx,4),%edx
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/* movl ASM_VALUE(decwin)+64,%eax */
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movl DECWIN,%eax
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addl $64,%eax
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movl %eax,%ecx
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subl %edx,%ecx
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movl $16,%ebp
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.L55:
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flds (%ecx)
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fmuls (%ebx)
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flds 4(%ecx)
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fmuls 4(%ebx)
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fxch %st(1)
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flds 8(%ecx)
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fmuls 8(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 12(%ecx)
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fmuls 12(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 16(%ecx)
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fmuls 16(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 20(%ecx)
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fmuls 20(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 24(%ecx)
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fmuls 24(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 28(%ecx)
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fmuls 28(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 32(%ecx)
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fmuls 32(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 36(%ecx)
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fmuls 36(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 40(%ecx)
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fmuls 40(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 44(%ecx)
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fmuls 44(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 48(%ecx)
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fmuls 48(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 52(%ecx)
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fmuls 52(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 56(%ecx)
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fmuls 56(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds 60(%ecx)
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fmuls 60(%ebx)
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fxch %st(2)
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subl $4,%esp
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faddp %st,%st(1)
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fxch %st(1)
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fsubrp %st,%st(1)
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addl $4,DITHERINDEX2
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andl $0x0003fffc,DITHERINDEX2
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movl DITHERNOISE2,%edi
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addl DITHERINDEX2,%edi
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fadds (%edi)
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/* fistpl and popl as a unit keep the stack unchanged */
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fistpl (%esp)
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popl %eax
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cmpl $32767,%eax
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jg 1f
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cmpl $-32768,%eax
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jl 2f
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movw %ax,(%esi)
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jmp 4f
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1: movw $32767,(%esi)
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jmp 3f
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2: movw $-32768,(%esi)
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3:
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/* incl %edi */
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4:
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.L54:
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addl $64,%ebx
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subl $-128,%ecx
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addl $4,%esi
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decl %ebp
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jnz .L55
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flds (%ecx)
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fmuls (%ebx)
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flds 8(%ecx)
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fmuls 8(%ebx)
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flds 16(%ecx)
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fmuls 16(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 24(%ecx)
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fmuls 24(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 32(%ecx)
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fmuls 32(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 40(%ecx)
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fmuls 40(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 48(%ecx)
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fmuls 48(%ebx)
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fxch %st(2)
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faddp %st,%st(1)
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flds 56(%ecx)
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fmuls 56(%ebx)
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fxch %st(2)
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subl $4,%esp
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faddp %st,%st(1)
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fxch %st(1)
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faddp %st,%st(1)
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addl $4,DITHERINDEX2
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andl $0x0003fffc,DITHERINDEX2
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movl DITHERNOISE2,%edi
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addl DITHERINDEX2,%edi
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fadds (%edi)
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/* fistpl and popl as a unit keep the stack unchanged */
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fistpl (%esp)
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popl %eax
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cmpl $32767,%eax
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jg 1f
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cmpl $-32768,%eax
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jl 2f
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movw %ax,(%esi)
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jmp 4f
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1: movw $32767,(%esi)
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jmp 3f
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2: movw $-32768,(%esi)
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3:
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/* incl %edi */
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4:
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.L62:
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addl $-64,%ebx
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addl $4,%esi
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movl LOC0,%edx
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leal -128(%ecx,%edx,8),%ecx
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movl $15,%ebp
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.L68:
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flds -4(%ecx)
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fchs
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fmuls (%ebx)
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flds -8(%ecx)
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fmuls 4(%ebx)
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fxch %st(1)
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flds -12(%ecx)
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fmuls 8(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -16(%ecx)
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fmuls 12(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -20(%ecx)
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fmuls 16(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -24(%ecx)
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fmuls 20(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -28(%ecx)
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fmuls 24(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -32(%ecx)
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fmuls 28(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -36(%ecx)
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fmuls 32(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -40(%ecx)
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fmuls 36(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -44(%ecx)
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fmuls 40(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -48(%ecx)
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fmuls 44(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -52(%ecx)
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fmuls 48(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -56(%ecx)
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fmuls 52(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds -60(%ecx)
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fmuls 56(%ebx)
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fxch %st(2)
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fsubrp %st,%st(1)
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flds (%ecx)
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fmuls 60(%ebx)
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fxch %st(2)
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subl $4,%esp
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fsubrp %st,%st(1)
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fxch %st(1)
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fsubrp %st,%st(1)
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addl $4,DITHERINDEX2
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andl $0x0003fffc,DITHERINDEX2
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movl DITHERNOISE2,%edi
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addl DITHERINDEX2,%edi
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fadds (%edi)
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/* fistpl and popl as a unit keep the stack unchanged */
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fistpl (%esp)
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popl %eax
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cmpl $32767,%eax
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jg 1f
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cmpl $-32768,%eax
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jl 2f
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movw %ax,(%esi)
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jmp 4f
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1: movw $32767,(%esi)
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jmp 3f
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2: movw $-32768,(%esi)
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3:
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/* incl %edi */
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4:
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.L67:
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addl $-64,%ebx
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addl $-128,%ecx
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addl $4,%esi
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decl %ebp
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jnz .L68
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/* return ipv edi 0 in eax */
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movl $0,%eax
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/* save ditherindex */
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movl BO,%ebx
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movl DITHERINDEX,%esi
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movl %esi,4(%ebx);
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/* 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 */
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popl %ebx
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popl %esi
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popl %edi
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popl %ebp
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addl $16,%esp
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/* The stack must be now: 0=back 4=bandptr 8=channel 12=out 16=buffs 20=bo */
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ret
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NONEXEC_STACK
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