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278 lines
9.2 KiB
278 lines
9.2 KiB
/* |
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* Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net> |
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* Copyright (c) 2013 RISC OS Open Ltd <bavison@riscosopen.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config.h" |
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#include "libavutil/arm/asm.S" |
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/** |
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* ARM VFP optimized float to int16 conversion. |
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* Assume that len is a positive number and is multiple of 8, destination |
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* buffer is at least 4 bytes aligned (8 bytes alignment is better for |
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* performance), little-endian byte sex. |
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*/ |
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@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len) |
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function ff_float_to_int16_vfp, export=1 |
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push {r4-r8,lr} |
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vpush {d8-d11} |
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vldmia r1!, {s16-s23} |
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vcvt.s32.f32 s0, s16 |
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vcvt.s32.f32 s1, s17 |
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vcvt.s32.f32 s2, s18 |
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vcvt.s32.f32 s3, s19 |
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vcvt.s32.f32 s4, s20 |
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vcvt.s32.f32 s5, s21 |
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vcvt.s32.f32 s6, s22 |
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vcvt.s32.f32 s7, s23 |
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1: |
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subs r2, r2, #8 |
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vmov r3, r4, s0, s1 |
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vmov r5, r6, s2, s3 |
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vmov r7, r8, s4, s5 |
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vmov ip, lr, s6, s7 |
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it gt |
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vldmiagt r1!, {s16-s23} |
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ssat r4, #16, r4 |
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ssat r3, #16, r3 |
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ssat r6, #16, r6 |
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ssat r5, #16, r5 |
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pkhbt r3, r3, r4, lsl #16 |
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pkhbt r4, r5, r6, lsl #16 |
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itttt gt |
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vcvtgt.s32.f32 s0, s16 |
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vcvtgt.s32.f32 s1, s17 |
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vcvtgt.s32.f32 s2, s18 |
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vcvtgt.s32.f32 s3, s19 |
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itttt gt |
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vcvtgt.s32.f32 s4, s20 |
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vcvtgt.s32.f32 s5, s21 |
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vcvtgt.s32.f32 s6, s22 |
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vcvtgt.s32.f32 s7, s23 |
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ssat r8, #16, r8 |
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ssat r7, #16, r7 |
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ssat lr, #16, lr |
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ssat ip, #16, ip |
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pkhbt r5, r7, r8, lsl #16 |
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pkhbt r6, ip, lr, lsl #16 |
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stmia r0!, {r3-r6} |
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bgt 1b |
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vpop {d8-d11} |
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pop {r4-r8,pc} |
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endfunc |
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/** |
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* ARM VFP optimised int32 to float conversion. |
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* Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned |
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* (16 bytes alignment is best for BCM2835), little-endian. |
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*/ |
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@ void ff_int32_to_float_fmul_array8_vfp(FmtConvertContext *c, float *dst, const int32_t *src, const float *mul, int len) |
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function ff_int32_to_float_fmul_array8_vfp, export=1 |
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push {lr} |
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ldr a1, [sp, #4] |
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subs lr, a1, #3*8 |
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bcc 50f @ too short to pipeline |
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@ Now need to find (len / 8) % 3. The approximation |
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@ x / 24 = (x * 0xAB) >> 12 |
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@ is good for x < 4096, which is true for both AC3 and DCA. |
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mov a1, #0xAB |
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ldr ip, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 |
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mul a1, lr, a1 |
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vpush {s16-s31} |
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mov a1, a1, lsr #12 |
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add a1, a1, a1, lsl #1 |
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rsb a1, a1, lr, lsr #3 |
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cmp a1, #1 |
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fmrx a1, FPSCR |
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fmxr FPSCR, ip |
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beq 11f |
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blo 10f |
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@ Array is (2 + multiple of 3) x 8 floats long |
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@ drop through... |
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vldmia a3!, {s16-s23} |
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vldmia a4!, {s2,s3} |
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vldmia a3!, {s24-s31} |
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vcvt.f32.s32 s16, s16 |
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vcvt.f32.s32 s17, s17 |
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vcvt.f32.s32 s18, s18 |
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vcvt.f32.s32 s19, s19 |
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vcvt.f32.s32 s20, s20 |
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vcvt.f32.s32 s21, s21 |
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vcvt.f32.s32 s22, s22 |
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vcvt.f32.s32 s23, s23 |
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vmul.f32 s16, s16, s2 |
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@ drop through... |
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3: |
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vldmia a3!, {s8-s15} |
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vldmia a4!, {s1} |
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vcvt.f32.s32 s24, s24 |
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vcvt.f32.s32 s25, s25 |
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vcvt.f32.s32 s26, s26 |
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vcvt.f32.s32 s27, s27 |
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vcvt.f32.s32 s28, s28 |
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vcvt.f32.s32 s29, s29 |
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vcvt.f32.s32 s30, s30 |
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vcvt.f32.s32 s31, s31 |
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vmul.f32 s24, s24, s3 |
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vstmia a2!, {s16-s19} |
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vstmia a2!, {s20-s23} |
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2: |
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vldmia a3!, {s16-s23} |
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vldmia a4!, {s2} |
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vcvt.f32.s32 s8, s8 |
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vcvt.f32.s32 s9, s9 |
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vcvt.f32.s32 s10, s10 |
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vcvt.f32.s32 s11, s11 |
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vcvt.f32.s32 s12, s12 |
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vcvt.f32.s32 s13, s13 |
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vcvt.f32.s32 s14, s14 |
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vcvt.f32.s32 s15, s15 |
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vmul.f32 s8, s8, s1 |
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vstmia a2!, {s24-s27} |
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vstmia a2!, {s28-s31} |
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1: |
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vldmia a3!, {s24-s31} |
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vldmia a4!, {s3} |
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vcvt.f32.s32 s16, s16 |
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vcvt.f32.s32 s17, s17 |
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vcvt.f32.s32 s18, s18 |
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vcvt.f32.s32 s19, s19 |
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vcvt.f32.s32 s20, s20 |
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vcvt.f32.s32 s21, s21 |
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vcvt.f32.s32 s22, s22 |
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vcvt.f32.s32 s23, s23 |
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vmul.f32 s16, s16, s2 |
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vstmia a2!, {s8-s11} |
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vstmia a2!, {s12-s15} |
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subs lr, lr, #8*3 |
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bpl 3b |
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vcvt.f32.s32 s24, s24 |
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vcvt.f32.s32 s25, s25 |
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vcvt.f32.s32 s26, s26 |
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vcvt.f32.s32 s27, s27 |
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vcvt.f32.s32 s28, s28 |
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vcvt.f32.s32 s29, s29 |
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vcvt.f32.s32 s30, s30 |
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vcvt.f32.s32 s31, s31 |
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vmul.f32 s24, s24, s3 |
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vstmia a2!, {s16-s19} |
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vstmia a2!, {s20-s23} |
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vstmia a2!, {s24-s27} |
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vstmia a2!, {s28-s31} |
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fmxr FPSCR, a1 |
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vpop {s16-s31} |
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pop {pc} |
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10: @ Array is (multiple of 3) x 8 floats long |
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vldmia a3!, {s8-s15} |
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vldmia a4!, {s1,s2} |
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vldmia a3!, {s16-s23} |
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vcvt.f32.s32 s8, s8 |
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vcvt.f32.s32 s9, s9 |
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vcvt.f32.s32 s10, s10 |
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vcvt.f32.s32 s11, s11 |
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vcvt.f32.s32 s12, s12 |
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vcvt.f32.s32 s13, s13 |
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vcvt.f32.s32 s14, s14 |
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vcvt.f32.s32 s15, s15 |
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vmul.f32 s8, s8, s1 |
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b 1b |
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11: @ Array is (1 + multiple of 3) x 8 floats long |
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vldmia a3!, {s24-s31} |
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vldmia a4!, {s3} |
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vldmia a3!, {s8-s15} |
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vldmia a4!, {s1} |
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vcvt.f32.s32 s24, s24 |
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vcvt.f32.s32 s25, s25 |
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vcvt.f32.s32 s26, s26 |
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vcvt.f32.s32 s27, s27 |
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vcvt.f32.s32 s28, s28 |
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vcvt.f32.s32 s29, s29 |
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vcvt.f32.s32 s30, s30 |
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vcvt.f32.s32 s31, s31 |
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vmul.f32 s24, s24, s3 |
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b 2b |
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50: |
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ldr lr, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 |
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fmrx ip, FPSCR |
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fmxr FPSCR, lr |
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51: |
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vldmia a3!, {s8-s15} |
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vldmia a4!, {s0} |
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vcvt.f32.s32 s8, s8 |
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vcvt.f32.s32 s9, s9 |
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vcvt.f32.s32 s10, s10 |
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vcvt.f32.s32 s11, s11 |
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vcvt.f32.s32 s12, s12 |
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vcvt.f32.s32 s13, s13 |
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vcvt.f32.s32 s14, s14 |
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vcvt.f32.s32 s15, s15 |
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vmul.f32 s8, s8, s0 |
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subs a1, a1, #8 |
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vstmia a2!, {s8-s11} |
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vstmia a2!, {s12-s15} |
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bne 51b |
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fmxr FPSCR, ip |
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pop {pc} |
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endfunc |
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/** |
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* ARM VFP optimised int32 to float conversion. |
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* Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned |
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* (16 bytes alignment is best for BCM2835), little-endian. |
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* TODO: could be further optimised by unrolling and interleaving, as above |
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*/ |
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@ void ff_int32_to_float_fmul_scalar_vfp(float *dst, const int32_t *src, float mul, int len) |
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function ff_int32_to_float_fmul_scalar_vfp, export=1 |
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VFP tmp .req a4 |
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VFP len .req a3 |
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NOVFP tmp .req a3 |
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NOVFP len .req a4 |
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NOVFP vmov s0, a3 |
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ldr tmp, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 |
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fmrx ip, FPSCR |
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fmxr FPSCR, tmp |
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1: |
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vldmia a2!, {s8-s15} |
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vcvt.f32.s32 s8, s8 |
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vcvt.f32.s32 s9, s9 |
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vcvt.f32.s32 s10, s10 |
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vcvt.f32.s32 s11, s11 |
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vcvt.f32.s32 s12, s12 |
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vcvt.f32.s32 s13, s13 |
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vcvt.f32.s32 s14, s14 |
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vcvt.f32.s32 s15, s15 |
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vmul.f32 s8, s8, s0 |
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subs len, len, #8 |
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vstmia a1!, {s8-s11} |
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vstmia a1!, {s12-s15} |
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bne 1b |
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fmxr FPSCR, ip |
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bx lr |
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endfunc |
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.unreq tmp |
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.unreq len
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