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/*
* Copyright (C) 2000 Red Hat, Inc
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
.file "scale_line_22_33_mmx.S"
.version "01.01"
gcc2_compiled.:
.text
.align 16
#if !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(__INTERIX)
/* Magic indicating no need for an executable stack */
#if !defined __powerpc64__ && !defined __ia64__
.section .note.GNU-stack; .previous
#endif
.globl _pixops_scale_line_22_33_mmx
.type _pixops_scale_line_22_33_mmx,@function
_pixops_scale_line_22_33_mmx:
#else
.globl __pixops_scale_line_22_33_mmx
__pixops_scale_line_22_33_mmx:
#endif
/*
* Arguments
*
* weights: 8(%ebp)
* p: 12(%ebp) %esi
* q1: 16(%ebp)
* q2: 20(%ebp)
* xstep: 24(%ebp)
* p_end: 28(%ebp)
* xinit: 32(%ebp)
*
*/
/*
* Function call entry
*/
pushl %ebp
movl %esp,%ebp
subl $28,%esp
pushl %edi
pushl %esi
pushl %ebx
/* Locals:
* int x %ebx
* int x_scaled -24(%ebp)
*/
/*
* Setup
*/
/* Initialize variables */
movl 32(%ebp),%ebx
movl 32(%ebp),%edx
sarl $16,%edx
movl 12(%ebp),%esi
cmpl 28(%ebp),%esi
jnb .out
/* For the body of this loop, %mm01, %mm1, %mm2, %mm3 hold the 4 adjoining
* points we are interpolating between, as:
*
* 000000BB00GG00RR
*/
/* Load initial values into %mm1, %mm3 */
leal (%edx,%edx,2),%edx # Multiply by 3
movl 16(%ebp),%edi
pxor %mm4, %mm4
movzbl 2(%edi,%edx),%ecx
shll $16,%ecx
movzwl (%edi,%edx),%eax
orl %eax,%ecx
movd %ecx, %mm1
punpcklbw %mm4, %mm1
movl 20(%ebp),%edi
movzbl 2(%edi,%edx),%ecx
shll $16,%ecx
movzwl (%edi,%edx),%eax
orl %eax,%ecx
movd %ecx, %mm3
punpcklbw %mm4, %mm3
addl $65536,%ebx
movl %ebx,%edx
sarl $16,%edx
jmp .newx
.p2align 4,,7
.loop:
/* short *pixel_weights = weights + ((x >> (SCALE_SHIFT - SUBSAMPLE_BITS)) & SUBSAMPLE_MASK) * n_x * n_y
* 16 4 0xf 2 2
*/
movl %ebx,%eax
andl $0xf000,%eax
shrl $7,%eax
/* At this point, %edi holds weights. Load the 4 weights into %mm4,%mm5,%mm6,%mm7, multiply and
* accumulate.
*/
movq (%edi,%eax),%mm4
pmullw %mm0,%mm4
movq 8(%edi,%eax),%mm5
pmullw %mm1,%mm5
movq 16(%edi,%eax),%mm6
movq 24(%edi,%eax),%mm7
pmullw %mm2,%mm6
pmullw %mm3,%mm7
paddw %mm4, %mm5
paddw %mm6, %mm7
paddw %mm5, %mm7
/* %mm7 holds the accumulated sum. Compute (C + 0x80) / 256
*/
pxor %mm4, %mm4
movl $8421504, %eax # 0x00808080
movd %eax, %mm6
punpcklbw %mm4, %mm6
paddw %mm6, %mm7
psrlw $8, %mm7
/* Pack into %eax and store result
*/
packuswb %mm7, %mm7
movd %mm7, %eax
movb %al, (%esi)
shrl $8, %eax
movw %ax, 1(%esi)
addl $3, %esi
cmpl %esi,28(%ebp)
je .out
/* x += x_step; */
addl 24(%ebp),%ebx
/* x_scaled = x >> 16; */
movl %ebx,%edx
sarl $16,%edx
cmpl %edx,-24(%ebp)
je .loop
.newx:
movl %edx,-24(%ebp)
/*
* Load the two new values into %mm1, %mm3, move old values into %mm0, %mm2
*/
movq %mm1, %mm0
movq %mm3, %mm2
leal (%edx,%edx,2),%edx # Multiply by 3
movl 16(%ebp),%edi
movzbl 2(%edi,%edx),%ecx
shll $16,%ecx
movzwl (%edi,%edx),%eax
orl %eax,%ecx
movd %ecx, %mm1
punpcklbw %mm4, %mm1
movl 20(%ebp),%edi
movzbl 2(%edi,%edx),%ecx
shll $16,%ecx
movzwl (%edi,%edx),%eax
orl %eax,%ecx
movd %ecx, %mm3
punpcklbw %mm4, %mm3
movl 8(%ebp),%edi
jmp .loop
.out:
movl %esi,%eax
emms
leal -40(%ebp),%esp
popl %ebx
popl %esi
popl %edi
movl %ebp,%esp
popl %ebp
ret
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