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diff --git a/vp9/encoder/x86/vp9_quantize_ssse3_x86_64.asm b/vp9/encoder/x86/vp9_quantize_ssse3_x86_64.asm
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@@ -0,0 +1,178 @@
+;
+; 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.
+;
+
+%define private_prefix vp9
+
+%include "third_party/x86inc/x86inc.asm"
+%include "vpx_dsp/x86/bitdepth_conversion_sse2.asm"
+
+SECTION_RODATA
+pw_1: times 8 dw 1
+
+SECTION .text
+
+%macro QUANTIZE_FP 2
+cglobal quantize_%1, 0, %2, 15, coeff, ncoeff, round, quant, \
+ qcoeff, dqcoeff, dequant, \
+ eob, scan, iscan
+
+ ; actual quantize loop - setup pointers, rounders, etc.
+ movifnidn coeffq, coeffmp
+ movifnidn ncoeffq, ncoeffmp
+ movifnidn roundq, roundmp
+ movifnidn quantq, quantmp
+ mova m1, [roundq] ; m1 = round
+ mova m2, [quantq] ; m2 = quant
+ mov r2, dequantmp
+%ifidn %1, fp_32x32
+ pcmpeqw m5, m5
+ psrlw m5, 15
+ paddw m1, m5
+ psrlw m1, 1 ; m1 = (m1 + 1) / 2
+%endif
+ mova m3, [r2q] ; m3 = dequant
+ mov r3, qcoeffmp
+ mov r4, dqcoeffmp
+ mov r5, iscanmp
+%ifidn %1, fp_32x32
+ psllw m2, 1
+%endif
+ pxor m5, m5 ; m5 = dedicated zero
+
+ INCREMENT_ELEMENTS_TRAN_LOW coeffq, ncoeffq
+ lea r5q, [r5q+ncoeffq*2]
+ INCREMENT_ELEMENTS_TRAN_LOW r3q, ncoeffq
+ INCREMENT_ELEMENTS_TRAN_LOW r4q, ncoeffq
+ neg ncoeffq
+
+ ; get DC and first 15 AC coeffs
+ LOAD_TRAN_LOW 9, coeffq, ncoeffq ; m9 = c[i]
+ LOAD_TRAN_LOW 10, coeffq, ncoeffq + 8 ; m10 = c[i]
+ pabsw m6, m9 ; m6 = abs(m9)
+ pabsw m11, m10 ; m11 = abs(m10)
+ pcmpeqw m7, m7
+
+ paddsw m6, m1 ; m6 += round
+ punpckhqdq m1, m1
+ paddsw m11, m1 ; m11 += round
+ pmulhw m8, m6, m2 ; m8 = m6*q>>16
+ punpckhqdq m2, m2
+ pmulhw m13, m11, m2 ; m13 = m11*q>>16
+ psignw m8, m9 ; m8 = reinsert sign
+ psignw m13, m10 ; m13 = reinsert sign
+ STORE_TRAN_LOW 8, r3q, ncoeffq, 6, 11, 12
+ STORE_TRAN_LOW 13, r3q, ncoeffq + 8, 6, 11, 12
+%ifidn %1, fp_32x32
+ pabsw m8, m8
+ pabsw m13, m13
+%endif
+ pmullw m8, m3 ; r4[i] = r3[i] * q
+ punpckhqdq m3, m3
+ pmullw m13, m3 ; r4[i] = r3[i] * q
+%ifidn %1, fp_32x32
+ psrlw m8, 1
+ psrlw m13, 1
+ psignw m8, m9
+ psignw m13, m10
+ psrlw m0, m3, 2
+%else
+ psrlw m0, m3, 1
+%endif
+ STORE_TRAN_LOW 8, r4q, ncoeffq, 6, 11, 12
+ STORE_TRAN_LOW 13, r4q, ncoeffq + 8, 6, 11, 12
+ pcmpeqw m8, m5 ; m8 = c[i] == 0
+ pcmpeqw m13, m5 ; m13 = c[i] == 0
+ mova m6, [ r5q+ncoeffq*2+ 0] ; m6 = scan[i]
+ mova m11, [ r5q+ncoeffq*2+16] ; m11 = scan[i]
+ psubw m6, m7 ; m6 = scan[i] + 1
+ psubw m11, m7 ; m11 = scan[i] + 1
+ pandn m8, m6 ; m8 = max(eob)
+ pandn m13, m11 ; m13 = max(eob)
+ pmaxsw m8, m13
+ add ncoeffq, mmsize
+ jz .accumulate_eob
+
+.ac_only_loop:
+ LOAD_TRAN_LOW 9, coeffq, ncoeffq ; m9 = c[i]
+ LOAD_TRAN_LOW 10, coeffq, ncoeffq + 8 ; m10 = c[i]
+ pabsw m6, m9 ; m6 = abs(m9)
+ pabsw m11, m10 ; m11 = abs(m10)
+
+ pcmpgtw m7, m6, m0
+ pcmpgtw m12, m11, m0
+ pmovmskb r6d, m7
+ pmovmskb r2d, m12
+
+ or r6, r2
+ jz .skip_iter
+
+ pcmpeqw m7, m7
+
+ paddsw m6, m1 ; m6 += round
+ paddsw m11, m1 ; m11 += round
+ pmulhw m14, m6, m2 ; m14 = m6*q>>16
+ pmulhw m13, m11, m2 ; m13 = m11*q>>16
+ psignw m14, m9 ; m14 = reinsert sign
+ psignw m13, m10 ; m13 = reinsert sign
+ STORE_TRAN_LOW 14, r3q, ncoeffq, 6, 11, 12
+ STORE_TRAN_LOW 13, r3q, ncoeffq + 8, 6, 11, 12
+%ifidn %1, fp_32x32
+ pabsw m14, m14
+ pabsw m13, m13
+%endif
+ pmullw m14, m3 ; r4[i] = r3[i] * q
+ pmullw m13, m3 ; r4[i] = r3[i] * q
+%ifidn %1, fp_32x32
+ psrlw m14, 1
+ psrlw m13, 1
+ psignw m14, m9
+ psignw m13, m10
+%endif
+ STORE_TRAN_LOW 14, r4q, ncoeffq, 6, 11, 12
+ STORE_TRAN_LOW 13, r4q, ncoeffq + 8, 6, 11, 12
+ pcmpeqw m14, m5 ; m14 = c[i] == 0
+ pcmpeqw m13, m5 ; m13 = c[i] == 0
+ mova m6, [ r5q+ncoeffq*2+ 0] ; m6 = scan[i]
+ mova m11, [ r5q+ncoeffq*2+16] ; m11 = scan[i]
+ psubw m6, m7 ; m6 = scan[i] + 1
+ psubw m11, m7 ; m11 = scan[i] + 1
+ pandn m14, m6 ; m14 = max(eob)
+ pandn m13, m11 ; m13 = max(eob)
+ pmaxsw m8, m14
+ pmaxsw m8, m13
+ add ncoeffq, mmsize
+ jl .ac_only_loop
+
+ jmp .accumulate_eob
+.skip_iter:
+ STORE_ZERO_TRAN_LOW 5, r3q, ncoeffq
+ STORE_ZERO_TRAN_LOW 5, r3q, ncoeffq + 8
+ STORE_ZERO_TRAN_LOW 5, r4q, ncoeffq
+ STORE_ZERO_TRAN_LOW 5, r4q, ncoeffq + 8
+ add ncoeffq, mmsize
+ jl .ac_only_loop
+
+.accumulate_eob:
+ ; horizontally accumulate/max eobs and write into [eob] memory pointer
+ mov r2, eobmp
+ pshufd m7, m8, 0xe
+ pmaxsw m8, m7
+ pshuflw m7, m8, 0xe
+ pmaxsw m8, m7
+ pshuflw m7, m8, 0x1
+ pmaxsw m8, m7
+ pextrw r6, m8, 0
+ mov [r2], r6w
+ RET
+%endmacro
+
+INIT_XMM ssse3
+QUANTIZE_FP fp, 7
+QUANTIZE_FP fp_32x32, 7