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336 lines
5.9 KiB
ArmAsm
336 lines
5.9 KiB
ArmAsm
/*
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decode_i586: asm synth
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copyright ?-2006 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
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synth_1to1 works the same way as the c version of this
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file. only two types of changes have been made:
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- reordered floating point instructions to
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prevent pipline stalls
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- made WRITE_SAMPLE use integer instead of
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(slower) floating point
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all kinds of x86 processors should benefit from these
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modifications.
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useful sources of information on optimizing x86 code include:
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Intel Architecture Optimization Manual
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http://www.intel.com/design/pentium/manuals/242816.htm
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Cyrix 6x86 Instruction Set Summary
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ftp://ftp.cyrix.com/6x86/6x-dbch6.pdf
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AMD-K5 Processor Software Development
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http://www.amd.com/products/cpg/techdocs/appnotes/20007e.pdf
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Stefan Bieschewski <stb@acm.org>
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$Id: decode_i586.s 1 2004-09-18 13:30:08Z thomas $
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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(real *bandPtr, int channel, unsigned char *out, unsigned char *buffs, int *bo, real *decwin); */
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.globl ASM_NAME(synth_1to1_i586_asm)
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ASM_NAME(synth_1to1_i586_asm):
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subl $12,%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=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 */
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movl 32(%esp),%eax /* *bandPtr */
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movl 40(%esp),%esi /* *out */
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movl 48(%esp),%edi /* *bo */
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movl (%edi),%ebp /* store bo value in ebp */
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xorl %edi,%edi
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cmpl %edi,36(%esp)
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jne .L48 /* if(!channel) */
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decl %ebp /* bo-- */
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andl $15,%ebp /* bo &= 0xf */
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movl 48(%esp), %edi /* *bo */
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movl %ebp,(%edi) /* write back bo */
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xorl %edi,%edi /* restore %edi to 0; it's used later */
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movl 44(%esp),%ecx /* use buffs */
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jmp .L49
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.L48: /* if(channel) use buffs+2176 */
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addl $2,%esi
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movl 44(%esp),%ecx /* *buffs */
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addl $2176,%ecx
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.L49:
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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,16(%esp)
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pushl %eax
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movl 20(%esp),%edx
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leal (%ebx,%edx,4),%eax
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pushl %eax
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movl 24(%esp),%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,16(%esp)
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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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/* stack now back on track */
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movl 16(%esp),%edx
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leal 0(,%edx,4),%edx
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movl 52(%esp),%eax /* decwin */
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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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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: 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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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: 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 16(%esp),%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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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: 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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movl %edi,%eax
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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 $12,%esp
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ret
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NONEXEC_STACK
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