2010-05-18 17:58:33 +02:00
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;
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2010-09-09 14:16:39 +02:00
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; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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2010-05-18 17:58:33 +02:00
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;
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2010-06-18 18:39:21 +02:00
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; Use of this source code is governed by a BSD-style license
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2010-06-04 22:19:40 +02:00
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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2010-06-18 18:39:21 +02:00
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; in the file PATENTS. All contributing project authors may
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2010-06-04 22:19:40 +02:00
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; be found in the AUTHORS file in the root of the source tree.
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2010-05-18 17:58:33 +02:00
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;
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EXPORT |vp8_fast_quantize_b_neon_func|
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ARM
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REQUIRE8
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PRESERVE8
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AREA ||.text||, CODE, READONLY, ALIGN=2
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; r0 short *coeff_ptr
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; r1 short *zbin_ptr
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; r2 short *qcoeff_ptr
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; r3 short *dqcoeff_ptr
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; stack short *dequant_ptr
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; stack short *scan_mask
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; stack short *round_ptr
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; stack short *quant_ptr
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; return int * eob
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|vp8_fast_quantize_b_neon_func| PROC
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vld1.16 {q0, q1}, [r0] ;load z
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vld1.16 {q10, q11}, [r1] ;load zbin
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vabs.s16 q4, q0 ;calculate x = abs(z)
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vabs.s16 q5, q1
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vcge.s16 q10, q4, q10 ;x>=zbin
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vcge.s16 q11, q5, q11
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;if x<zbin (q10 & q11 are all 0), go to zero_output
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vorr.s16 q6, q10, q11
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vorr.s16 d12, d12, d13
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vmov r0, r1, d12
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orr r0, r0, r1
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cmp r0, #0
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beq zero_output
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ldr r0, [sp, #8] ;load round_ptr
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ldr r12, [sp, #12] ;load quant_ptr
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;right shift 15 to get sign, all 0 if it is positive, all 1 if it is negative
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vshr.s16 q2, q0, #15 ; sz
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vshr.s16 q3, q1, #15
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vld1.s16 {q6, q7}, [r0] ;load round_ptr [0-15]
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vld1.s16 {q8, q9}, [r12] ;load quant_ptr [0-15]
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vadd.s16 q4, q6 ;x + Round
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vadd.s16 q5, q7
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ldr r0, [sp, #4] ;load rvsplus1_scan_order ptr
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vqdmulh.s16 q4, q8 ;y = ((Round + abs(z)) * Quant) >> 16
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vqdmulh.s16 q5, q9
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vld1.16 {q0, q1}, [r0] ;load rvsplus1_scan_order
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vceq.s16 q8, q8 ;set q8 to all 1
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vshr.s16 q4, #1 ;right shift 1 after vqdmulh
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vshr.s16 q5, #1
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;modify data to have its original sign
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veor.s16 q4, q2 ; y^sz
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veor.s16 q5, q3
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ldr r12, [sp] ;load dequant_ptr
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vsub.s16 q4, q2 ; x1 = (y^sz) - sz = (y^sz) - (-1) (two's complement)
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vsub.s16 q5, q3
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vand.s16 q4, q10 ;mask off x1 elements
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vand.s16 q5, q11
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vld1.s16 {q6, q7}, [r12] ;load dequant_ptr[i]
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vtst.16 q14, q4, q8 ;now find eob
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vtst.16 q15, q5, q8 ;non-zero element is set to all 1 in q4, q5
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vst1.s16 {q4, q5}, [r2] ;store: qcoeff = x1
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vand q0, q0, q14 ;get all valid number from rvsplus1_scan_order array
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vand q1, q1, q15
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vmax.u16 q0, q0, q1 ;find maximum value in q0, q1
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vmax.u16 d0, d0, d1
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vmovl.u16 q0, d0
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vmul.s16 q6, q4 ;x * Dequant
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vmul.s16 q7, q5
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vmax.u32 d0, d0, d1
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vpmax.u32 d0, d0, d0
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vst1.s16 {q6, q7}, [r3] ;store dqcoeff = x * Dequant
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vmov.32 r0, d0[0]
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bx lr
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zero_output
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vst1.s16 {q10, q11}, [r2] ; qcoeff = 0
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vst1.s16 {q10, q11}, [r3] ; dqcoeff = 0
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mov r0, #0
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bx lr
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ENDP
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END
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