1 ; 2 ; Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 ; 4 ; Use of this source code is governed by a BSD-style license 5 ; that can be found in the LICENSE file in the root of the source 6 ; tree. An additional intellectual property rights grant can be found 7 ; in the file PATENTS. All contributing project authors may 8 ; be found in the AUTHORS file in the root of the source tree. 9 ; 10 11 12 EXPORT |vp8_fast_quantize_b_neon_func| 13 14 ARM 15 REQUIRE8 16 PRESERVE8 17 18 AREA ||.text||, CODE, READONLY, ALIGN=2 19 20 ; r0 short *coeff_ptr 21 ; r1 short *zbin_ptr 22 ; r2 short *qcoeff_ptr 23 ; r3 short *dqcoeff_ptr 24 ; stack short *dequant_ptr 25 ; stack short *scan_mask 26 ; stack short *round_ptr 27 ; stack short *quant_ptr 28 29 ; return int * eob 30 |vp8_fast_quantize_b_neon_func| PROC 31 vld1.16 {q0, q1}, [r0] ;load z 32 vld1.16 {q10, q11}, [r1] ;load zbin 33 34 vabs.s16 q4, q0 ;calculate x = abs(z) 35 vabs.s16 q5, q1 36 37 vcge.s16 q10, q4, q10 ;x>=zbin 38 vcge.s16 q11, q5, q11 39 40 ;if x<zbin (q10 & q11 are all 0), go to zero_output 41 vorr.s16 q6, q10, q11 42 vorr.s16 d12, d12, d13 43 vmov r0, r1, d12 44 orr r0, r0, r1 45 cmp r0, #0 46 beq zero_output 47 48 ldr r0, [sp, #8] ;load round_ptr 49 ldr r12, [sp, #12] ;load quant_ptr 50 51 ;right shift 15 to get sign, all 0 if it is positive, all 1 if it is negative 52 vshr.s16 q2, q0, #15 ; sz 53 vshr.s16 q3, q1, #15 54 55 vld1.s16 {q6, q7}, [r0] ;load round_ptr [0-15] 56 vld1.s16 {q8, q9}, [r12] ;load quant_ptr [0-15] 57 58 vadd.s16 q4, q6 ;x + Round 59 vadd.s16 q5, q7 60 61 ldr r0, [sp, #4] ;load rvsplus1_scan_order ptr 62 63 vqdmulh.s16 q4, q8 ;y = ((Round + abs(z)) * Quant) >> 16 64 vqdmulh.s16 q5, q9 65 66 vld1.16 {q0, q1}, [r0] ;load rvsplus1_scan_order 67 vceq.s16 q8, q8 ;set q8 to all 1 68 69 vshr.s16 q4, #1 ;right shift 1 after vqdmulh 70 vshr.s16 q5, #1 71 72 ;modify data to have its original sign 73 veor.s16 q4, q2 ; y^sz 74 veor.s16 q5, q3 75 76 ldr r12, [sp] ;load dequant_ptr 77 78 vsub.s16 q4, q2 ; x1 = (y^sz) - sz = (y^sz) - (-1) (two's complement) 79 vsub.s16 q5, q3 80 81 vand.s16 q4, q10 ;mask off x1 elements 82 vand.s16 q5, q11 83 84 vld1.s16 {q6, q7}, [r12] ;load dequant_ptr[i] 85 86 vtst.16 q14, q4, q8 ;now find eob 87 vtst.16 q15, q5, q8 ;non-zero element is set to all 1 in q4, q5 88 89 vst1.s16 {q4, q5}, [r2] ;store: qcoeff = x1 90 91 vand q0, q0, q14 ;get all valid number from rvsplus1_scan_order array 92 vand q1, q1, q15 93 94 vmax.u16 q0, q0, q1 ;find maximum value in q0, q1 95 vmax.u16 d0, d0, d1 96 vmovl.u16 q0, d0 97 98 vmul.s16 q6, q4 ;x * Dequant 99 vmul.s16 q7, q5 100 101 vmax.u32 d0, d0, d1 102 vpmax.u32 d0, d0, d0 103 104 vst1.s16 {q6, q7}, [r3] ;store dqcoeff = x * Dequant 105 106 vmov.32 r0, d0[0] 107 bx lr 108 109 zero_output 110 vst1.s16 {q10, q11}, [r2] ; qcoeff = 0 111 vst1.s16 {q10, q11}, [r3] ; dqcoeff = 0 112 mov r0, #0 113 114 bx lr 115 116 ENDP 117 118 END 119
