/*

 decode_i586: asm synth

 copyright ?-2006 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

 synth_1to1 works the same way as the c version of this

 file.  only two types of changes have been made:

 - reordered floating point instructions to

   prevent pipline stalls

 - made WRITE_SAMPLE use integer instead of

   (slower) floating point

 all kinds of x86 processors should benefit from these

 modifications.

 useful sources of information on optimizing x86 code include:

     Intel Architecture Optimization Manual

     http://www.intel.com/design/pentium/manuals/242816.htm

     Cyrix 6x86 Instruction Set Summary

     ftp://ftp.cyrix.com/6x86/6x-dbch6.pdf

     AMD-K5 Processor Software Development

     http://www.amd.com/products/cpg/techdocs/appnotes/20007e.pdf

 Stefan Bieschewski <stb@acm.org>

 $Id: decode_i586.s 1 2004-09-18 13:30:08Z thomas $

*/

#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(real *bandPtr, int channel, unsigned char *out, unsigned char *buffs, int *bo, real *decwin); */

.globl ASM_NAME(synth_1to1_i586_asm)

ASM_NAME(synth_1to1_i586_asm):

	subl $12,%esp

	pushl %ebp

	pushl %edi

	pushl %esi

	pushl %ebx

/* stack: 0=ebx, 4=esi, 8=edi, 12=ebp, 16,20,24=local, 28=back, 32=bandPtr, 36=channel, 40=out, 44=buffs, 48=bo, 52=decwin */

	movl 32(%esp),%eax /* *bandPtr */

	movl 40(%esp),%esi /* *out */

	movl 48(%esp),%edi /* *bo */

	movl (%edi),%ebp   /* store bo value in ebp */

	xorl %edi,%edi

	cmpl %edi,36(%esp)

	jne .L48           /* if(!channel) */

	decl %ebp          /* bo-- */

	andl $15,%ebp      /* bo &= 0xf */

	movl 48(%esp),	%edi /* *bo */

	movl %ebp,(%edi)   /* write back bo */

	xorl %edi,%edi     /* restore %edi to 0; it's used later */

	movl 44(%esp),%ecx /* use buffs */

	jmp .L49

.L48: /* if(channel) use buffs+2176 */

	addl $2,%esi

	movl 44(%esp),%ecx /* *buffs */

	addl $2176,%ecx

.L49:

	testl $1,%ebp

	je .L50

	movl %ecx,%ebx

	movl %ebp,16(%esp)

	pushl %eax

	movl 20(%esp),%edx

	leal (%ebx,%edx,4),%eax

	pushl %eax

	movl 24(%esp),%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,16(%esp)

	pushl %eax

	leal 1092(%ecx,%ebp,4),%eax

	pushl %eax

	leal (%ecx,%ebp,4),%eax

.L74:

	pushl %eax

	call FUNC(dct64_i386)

	addl $12,%esp

/* stack now back on track */

	movl 16(%esp),%edx

	leal 0(,%edx,4),%edx

	movl 52(%esp),%eax /* decwin */

	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)

	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)

	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 16(%esp),%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)

	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

	movl %edi,%eax

	popl %ebx

	popl %esi

	popl %edi

	popl %ebp

	addl $12,%esp

	ret

#if defined(PIC) && defined(__APPLE__)

	.section __IMPORT,__jump_table,symbol_stubs,self_modifying_code+pure_instructions,5

L_dct64_i386:

	.indirect_symbol ASM_NAME(dct64_i386)

	hlt ; hlt ; hlt ; hlt ; hlt

#endif

NONEXEC_STACK