ref: a39b723eb34ef5921947e4deae3b6b7630ed04b9
dir: /vp8/encoder/x86/quantize_mmx.asm/
;
; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
;
; Use of this source code is governed by a BSD-style license
; that can be found in the LICENSE file in the root of the source
; tree. An additional intellectual property rights grant can be found
; in the file PATENTS. All contributing project authors may
; be found in the AUTHORS file in the root of the source tree.
;
%include "vpx_ports/x86_abi_support.asm"
;int vp8_fast_quantize_b_impl_mmx(short *coeff_ptr, short *zbin_ptr,
; short *qcoeff_ptr,short *dequant_ptr,
; short *scan_mask, short *round_ptr,
; short *quant_ptr, short *dqcoeff_ptr);
global sym(vp8_fast_quantize_b_impl_mmx) PRIVATE
sym(vp8_fast_quantize_b_impl_mmx):
push rbp
mov rbp, rsp
SHADOW_ARGS_TO_STACK 8
push rsi
push rdi
; end prolog
mov rsi, arg(0) ;coeff_ptr
movq mm0, [rsi]
mov rax, arg(1) ;zbin_ptr
movq mm1, [rax]
movq mm3, mm0
psraw mm0, 15
pxor mm3, mm0
psubw mm3, mm0 ; abs
movq mm2, mm3
pcmpgtw mm1, mm2
pandn mm1, mm2
movq mm3, mm1
mov rdx, arg(6) ;quant_ptr
movq mm1, [rdx]
mov rcx, arg(5) ;round_ptr
movq mm2, [rcx]
paddw mm3, mm2
pmulhuw mm3, mm1
pxor mm3, mm0
psubw mm3, mm0 ;gain the sign back
mov rdi, arg(2) ;qcoeff_ptr
movq mm0, mm3
movq [rdi], mm3
mov rax, arg(3) ;dequant_ptr
movq mm2, [rax]
pmullw mm3, mm2
mov rax, arg(7) ;dqcoeff_ptr
movq [rax], mm3
; next 8
movq mm4, [rsi+8]
mov rax, arg(1) ;zbin_ptr
movq mm5, [rax+8]
movq mm7, mm4
psraw mm4, 15
pxor mm7, mm4
psubw mm7, mm4 ; abs
movq mm6, mm7
pcmpgtw mm5, mm6
pandn mm5, mm6
movq mm7, mm5
movq mm5, [rdx+8]
movq mm6, [rcx+8]
paddw mm7, mm6
pmulhuw mm7, mm5
pxor mm7, mm4
psubw mm7, mm4;gain the sign back
mov rdi, arg(2) ;qcoeff_ptr
movq mm1, mm7
movq [rdi+8], mm7
mov rax, arg(3) ;dequant_ptr
movq mm6, [rax+8]
pmullw mm7, mm6
mov rax, arg(7) ;dqcoeff_ptr
movq [rax+8], mm7
; next 8
movq mm4, [rsi+16]
mov rax, arg(1) ;zbin_ptr
movq mm5, [rax+16]
movq mm7, mm4
psraw mm4, 15
pxor mm7, mm4
psubw mm7, mm4 ; abs
movq mm6, mm7
pcmpgtw mm5, mm6
pandn mm5, mm6
movq mm7, mm5
movq mm5, [rdx+16]
movq mm6, [rcx+16]
paddw mm7, mm6
pmulhuw mm7, mm5
pxor mm7, mm4
psubw mm7, mm4;gain the sign back
mov rdi, arg(2) ;qcoeff_ptr
movq mm1, mm7
movq [rdi+16], mm7
mov rax, arg(3) ;dequant_ptr
movq mm6, [rax+16]
pmullw mm7, mm6
mov rax, arg(7) ;dqcoeff_ptr
movq [rax+16], mm7
; next 8
movq mm4, [rsi+24]
mov rax, arg(1) ;zbin_ptr
movq mm5, [rax+24]
movq mm7, mm4
psraw mm4, 15
pxor mm7, mm4
psubw mm7, mm4 ; abs
movq mm6, mm7
pcmpgtw mm5, mm6
pandn mm5, mm6
movq mm7, mm5
movq mm5, [rdx+24]
movq mm6, [rcx+24]
paddw mm7, mm6
pmulhuw mm7, mm5
pxor mm7, mm4
psubw mm7, mm4;gain the sign back
mov rdi, arg(2) ;qcoeff_ptr
movq mm1, mm7
movq [rdi+24], mm7
mov rax, arg(3) ;dequant_ptr
movq mm6, [rax+24]
pmullw mm7, mm6
mov rax, arg(7) ;dqcoeff_ptr
movq [rax+24], mm7
mov rdi, arg(4) ;scan_mask
mov rsi, arg(2) ;qcoeff_ptr
pxor mm5, mm5
pxor mm7, mm7
movq mm0, [rsi]
movq mm1, [rsi+8]
movq mm2, [rdi]
movq mm3, [rdi+8];
pcmpeqw mm0, mm7
pcmpeqw mm1, mm7
pcmpeqw mm6, mm6
pxor mm0, mm6
pxor mm1, mm6
psrlw mm0, 15
psrlw mm1, 15
pmaddwd mm0, mm2
pmaddwd mm1, mm3
movq mm5, mm0
paddd mm5, mm1
movq mm0, [rsi+16]
movq mm1, [rsi+24]
movq mm2, [rdi+16]
movq mm3, [rdi+24];
pcmpeqw mm0, mm7
pcmpeqw mm1, mm7
pcmpeqw mm6, mm6
pxor mm0, mm6
pxor mm1, mm6
psrlw mm0, 15
psrlw mm1, 15
pmaddwd mm0, mm2
pmaddwd mm1, mm3
paddd mm5, mm0
paddd mm5, mm1
movq mm0, mm5
psrlq mm5, 32
paddd mm0, mm5
; eob adjustment begins here
movq rcx, mm0
and rcx, 0xffff
xor rdx, rdx
sub rdx, rcx ; rdx=-rcx
bsr rax, rcx
inc rax
sar rdx, 31
and rax, rdx
; Substitute the sse assembly for the old mmx mixed assembly/C. The
; following is kept as reference
; movq rcx, mm0
; bsr rax, rcx
;
; mov eob, rax
; mov eee, rcx
;
;if(eee==0)
;{
; eob=-1;
;}
;else if(eee<0)
;{
; eob=15;
;}
;d->eob = eob+1;
; begin epilog
pop rdi
pop rsi
UNSHADOW_ARGS
pop rbp
ret