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-rw-r--r--media/ffvpx/libavcodec/arm/fft_vfp.S530
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diff --git a/media/ffvpx/libavcodec/arm/fft_vfp.S b/media/ffvpx/libavcodec/arm/fft_vfp.S
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+/*
+ * Copyright (c) 2013 RISC OS Open Ltd
+ * Author: Ben Avison <bavison@riscosopen.org>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/arm/asm.S"
+
+@ The fftx_internal_vfp versions of the functions obey a modified AAPCS:
+@ VFP is in RunFast mode, vector length 4, stride 1 thoroughout, and
+@ all single-precision VFP registers may be corrupted on exit. The a2
+@ register may not be clobbered in these functions, as it holds the
+@ stored original FPSCR.
+
+function ff_fft_calc_vfp, export=1
+ ldr ip, [a1, #0] @ nbits
+ mov a1, a2
+ movrel a2, (fft_tab_vfp - 8)
+ ldr pc, [a2, ip, lsl #2]
+endfunc
+const fft_tab_vfp, relocate=1
+ .word fft4_vfp
+ .word fft8_vfp
+ .word X(ff_fft16_vfp) @ this one alone is exported
+ .word fft32_vfp
+ .word fft64_vfp
+ .word fft128_vfp
+ .word fft256_vfp
+ .word fft512_vfp
+ .word fft1024_vfp
+ .word fft2048_vfp
+ .word fft4096_vfp
+ .word fft8192_vfp
+ .word fft16384_vfp
+ .word fft32768_vfp
+ .word fft65536_vfp
+endconst
+
+function fft4_vfp
+ vldr d0, [a1, #0*2*4] @ s0,s1 = z[0]
+ vldr d4, [a1, #1*2*4] @ s8,s9 = z[1]
+ vldr d1, [a1, #2*2*4] @ s2,s3 = z[2]
+ vldr d5, [a1, #3*2*4] @ s10,s11 = z[3]
+ @ stall
+ vadd.f s12, s0, s8 @ i0
+ vadd.f s13, s1, s9 @ i1
+ vadd.f s14, s2, s10 @ i2
+ vadd.f s15, s3, s11 @ i3
+ vsub.f s8, s0, s8 @ i4
+ vsub.f s9, s1, s9 @ i5
+ vsub.f s10, s2, s10 @ i6
+ vsub.f s11, s3, s11 @ i7
+ @ stall
+ @ stall
+ vadd.f s0, s12, s14 @ z[0].re
+ vsub.f s4, s12, s14 @ z[2].re
+ vadd.f s1, s13, s15 @ z[0].im
+ vsub.f s5, s13, s15 @ z[2].im
+ vadd.f s7, s9, s10 @ z[3].im
+ vsub.f s3, s9, s10 @ z[1].im
+ vadd.f s2, s8, s11 @ z[1].re
+ vsub.f s6, s8, s11 @ z[3].re
+ @ stall
+ @ stall
+ vstr d0, [a1, #0*2*4]
+ vstr d2, [a1, #2*2*4]
+ @ stall
+ @ stall
+ vstr d1, [a1, #1*2*4]
+ vstr d3, [a1, #3*2*4]
+
+ bx lr
+endfunc
+
+.macro macro_fft8_head
+ @ FFT4
+ vldr d4, [a1, #0 * 2*4]
+ vldr d6, [a1, #1 * 2*4]
+ vldr d5, [a1, #2 * 2*4]
+ vldr d7, [a1, #3 * 2*4]
+ @ BF
+ vldr d12, [a1, #4 * 2*4]
+ vadd.f s16, s8, s12 @ vector op
+ vldr d14, [a1, #5 * 2*4]
+ vldr d13, [a1, #6 * 2*4]
+ vldr d15, [a1, #7 * 2*4]
+ vsub.f s20, s8, s12 @ vector op
+ vadd.f s0, s16, s18
+ vsub.f s2, s16, s18
+ vadd.f s1, s17, s19
+ vsub.f s3, s17, s19
+ vadd.f s7, s21, s22
+ vsub.f s5, s21, s22
+ vadd.f s4, s20, s23
+ vsub.f s6, s20, s23
+ vsub.f s20, s24, s28 @ vector op
+ vstr d0, [a1, #0 * 2*4] @ transfer s0-s7 to s24-s31 via memory
+ vstr d1, [a1, #1 * 2*4]
+ vldr s0, cos1pi4
+ vadd.f s16, s24, s28 @ vector op
+ vstr d2, [a1, #2 * 2*4]
+ vstr d3, [a1, #3 * 2*4]
+ vldr d12, [a1, #0 * 2*4]
+ @ TRANSFORM
+ vmul.f s20, s20, s0 @ vector x scalar op
+ vldr d13, [a1, #1 * 2*4]
+ vldr d14, [a1, #2 * 2*4]
+ vldr d15, [a1, #3 * 2*4]
+ @ BUTTERFLIES
+ vadd.f s0, s18, s16
+ vadd.f s1, s17, s19
+ vsub.f s2, s17, s19
+ vsub.f s3, s18, s16
+ vadd.f s4, s21, s20
+ vsub.f s5, s21, s20
+ vadd.f s6, s22, s23
+ vsub.f s7, s22, s23
+ vadd.f s8, s0, s24 @ vector op
+ vstr d0, [a1, #0 * 2*4] @ transfer s0-s3 to s12-s15 via memory
+ vstr d1, [a1, #1 * 2*4]
+ vldr d6, [a1, #0 * 2*4]
+ vldr d7, [a1, #1 * 2*4]
+ vadd.f s1, s5, s6
+ vadd.f s0, s7, s4
+ vsub.f s2, s5, s6
+ vsub.f s3, s7, s4
+ vsub.f s12, s24, s12 @ vector op
+ vsub.f s5, s29, s1
+ vsub.f s4, s28, s0
+ vsub.f s6, s30, s2
+ vsub.f s7, s31, s3
+ vadd.f s16, s0, s28 @ vector op
+ vstr d6, [a1, #4 * 2*4]
+ vstr d7, [a1, #6 * 2*4]
+ vstr d4, [a1, #0 * 2*4]
+ vstr d5, [a1, #2 * 2*4]
+ vstr d2, [a1, #5 * 2*4]
+ vstr d3, [a1, #7 * 2*4]
+.endm
+
+.macro macro_fft8_tail
+ vstr d8, [a1, #1 * 2*4]
+ vstr d9, [a1, #3 * 2*4]
+.endm
+
+function .Lfft8_internal_vfp
+ macro_fft8_head
+ macro_fft8_tail
+ bx lr
+endfunc
+
+function fft8_vfp
+ ldr a3, =0x03030000 @ RunFast mode, vector length 4, stride 1
+ fmrx a2, FPSCR
+ fmxr FPSCR, a3
+ vpush {s16-s31}
+ mov ip, lr
+ bl .Lfft8_internal_vfp
+ vpop {s16-s31}
+ fmxr FPSCR, a2
+ bx ip
+endfunc
+
+.align 3
+cos1pi4: @ cos(1*pi/4) = sqrt(2)
+ .float 0.707106769084930419921875
+cos1pi8: @ cos(1*pi/8) = sqrt(2+sqrt(2))/2
+ .float 0.92387950420379638671875
+cos3pi8: @ cos(2*pi/8) = sqrt(2-sqrt(2))/2
+ .float 0.3826834261417388916015625
+
+function .Lfft16_internal_vfp
+ macro_fft8_head
+ @ FFT4(z+8)
+ vldr d10, [a1, #8 * 2*4]
+ vldr d12, [a1, #9 * 2*4]
+ vldr d11, [a1, #10 * 2*4]
+ vldr d13, [a1, #11 * 2*4]
+ macro_fft8_tail
+ vadd.f s16, s20, s24 @ vector op
+ @ FFT4(z+12)
+ vldr d4, [a1, #12 * 2*4]
+ vldr d6, [a1, #13 * 2*4]
+ vldr d5, [a1, #14 * 2*4]
+ vsub.f s20, s20, s24 @ vector op
+ vldr d7, [a1, #15 * 2*4]
+ vadd.f s0, s16, s18
+ vsub.f s4, s16, s18
+ vadd.f s1, s17, s19
+ vsub.f s5, s17, s19
+ vadd.f s7, s21, s22
+ vsub.f s3, s21, s22
+ vadd.f s2, s20, s23
+ vsub.f s6, s20, s23
+ vadd.f s16, s8, s12 @ vector op
+ vstr d0, [a1, #8 * 2*4]
+ vstr d2, [a1, #10 * 2*4]
+ vstr d1, [a1, #9 * 2*4]
+ vsub.f s20, s8, s12
+ vstr d3, [a1, #11 * 2*4]
+ @ TRANSFORM(z[2],z[6],z[10],z[14],cos1pi4,cos1pi4)
+ vldr d12, [a1, #10 * 2*4]
+ vadd.f s0, s16, s18
+ vadd.f s1, s17, s19
+ vsub.f s6, s16, s18
+ vsub.f s7, s17, s19
+ vsub.f s3, s21, s22
+ vadd.f s2, s20, s23
+ vadd.f s5, s21, s22
+ vsub.f s4, s20, s23
+ vstr d0, [a1, #12 * 2*4]
+ vmov s0, s6
+ @ TRANSFORM(z[1],z[5],z[9],z[13],cos1pi8,cos3pi8)
+ vldr d6, [a1, #9 * 2*4]
+ vstr d1, [a1, #13 * 2*4]
+ vldr d1, cos1pi4 @ s2 = cos1pi4, s3 = cos1pi8
+ vstr d2, [a1, #15 * 2*4]
+ vldr d7, [a1, #13 * 2*4]
+ vadd.f s4, s25, s24
+ vsub.f s5, s25, s24
+ vsub.f s6, s0, s7
+ vadd.f s7, s0, s7
+ vmul.f s20, s12, s3 @ vector op
+ @ TRANSFORM(z[3],z[7],z[11],z[15],cos3pi8,cos1pi8)
+ vldr d4, [a1, #11 * 2*4]
+ vldr d5, [a1, #15 * 2*4]
+ vldr s1, cos3pi8
+ vmul.f s24, s4, s2 @ vector * scalar op
+ vmul.f s28, s12, s1 @ vector * scalar op
+ vmul.f s12, s8, s1 @ vector * scalar op
+ vadd.f s4, s20, s29
+ vsub.f s5, s21, s28
+ vsub.f s6, s22, s31
+ vadd.f s7, s23, s30
+ vmul.f s8, s8, s3 @ vector * scalar op
+ vldr d8, [a1, #1 * 2*4]
+ vldr d9, [a1, #5 * 2*4]
+ vldr d10, [a1, #3 * 2*4]
+ vldr d11, [a1, #7 * 2*4]
+ vldr d14, [a1, #2 * 2*4]
+ vadd.f s0, s6, s4
+ vadd.f s1, s5, s7
+ vsub.f s2, s5, s7
+ vsub.f s3, s6, s4
+ vadd.f s4, s12, s9
+ vsub.f s5, s13, s8
+ vsub.f s6, s14, s11
+ vadd.f s7, s15, s10
+ vadd.f s12, s0, s16 @ vector op
+ vstr d0, [a1, #1 * 2*4]
+ vstr d1, [a1, #5 * 2*4]
+ vldr d4, [a1, #1 * 2*4]
+ vldr d5, [a1, #5 * 2*4]
+ vadd.f s0, s6, s4
+ vadd.f s1, s5, s7
+ vsub.f s2, s5, s7
+ vsub.f s3, s6, s4
+ vsub.f s8, s16, s8 @ vector op
+ vstr d6, [a1, #1 * 2*4]
+ vstr d7, [a1, #5 * 2*4]
+ vldr d15, [a1, #6 * 2*4]
+ vsub.f s4, s20, s0
+ vsub.f s5, s21, s1
+ vsub.f s6, s22, s2
+ vsub.f s7, s23, s3
+ vadd.f s20, s0, s20 @ vector op
+ vstr d4, [a1, #9 * 2*4]
+ @ TRANSFORM_ZERO(z[0],z[4],z[8],z[12])
+ vldr d6, [a1, #8 * 2*4]
+ vstr d5, [a1, #13 * 2*4]
+ vldr d7, [a1, #12 * 2*4]
+ vstr d2, [a1, #11 * 2*4]
+ vldr d8, [a1, #0 * 2*4]
+ vstr d3, [a1, #15 * 2*4]
+ vldr d9, [a1, #4 * 2*4]
+ vadd.f s0, s26, s24
+ vadd.f s1, s25, s27
+ vsub.f s2, s25, s27
+ vsub.f s3, s26, s24
+ vadd.f s4, s14, s12
+ vadd.f s5, s13, s15
+ vsub.f s6, s13, s15
+ vsub.f s7, s14, s12
+ vadd.f s8, s0, s28 @ vector op
+ vstr d0, [a1, #3 * 2*4]
+ vstr d1, [a1, #7 * 2*4]
+ vldr d6, [a1, #3 * 2*4]
+ vldr d7, [a1, #7 * 2*4]
+ vsub.f s0, s16, s4
+ vsub.f s1, s17, s5
+ vsub.f s2, s18, s6
+ vsub.f s3, s19, s7
+ vsub.f s12, s28, s12 @ vector op
+ vadd.f s16, s4, s16 @ vector op
+ vstr d10, [a1, #3 * 2*4]
+ vstr d11, [a1, #7 * 2*4]
+ vstr d4, [a1, #2 * 2*4]
+ vstr d5, [a1, #6 * 2*4]
+ vstr d0, [a1, #8 * 2*4]
+ vstr d1, [a1, #12 * 2*4]
+ vstr d6, [a1, #10 * 2*4]
+ vstr d7, [a1, #14 * 2*4]
+ vstr d8, [a1, #0 * 2*4]
+ vstr d9, [a1, #4 * 2*4]
+
+ bx lr
+endfunc
+
+function ff_fft16_vfp, export=1
+ ldr a3, =0x03030000 @ RunFast mode, vector length 4, stride 1
+ fmrx a2, FPSCR
+ fmxr FPSCR, a3
+ vpush {s16-s31}
+ mov ip, lr
+ bl .Lfft16_internal_vfp
+ vpop {s16-s31}
+ fmxr FPSCR, a2
+ bx ip
+endfunc
+
+.macro pass n, z0, z1, z2, z3
+ add v6, v5, #4*2*\n
+ @ TRANSFORM_ZERO(z[0],z[o1],z[o2],z[o3])
+ @ TRANSFORM(z[1],z[o1+1],z[o2+1],z[o3+1],wre[1],wim[-1])
+ @ TRANSFORM(z[0],z[o1],z[o2],z[o3],wre[0],wim[0])
+ @ TRANSFORM(z[1],z[o1+1],z[o2+1],z[o3+1],wre[1],wim[-1])
+ vldr d8, [\z2, #8*(o2+1)] @ s16,s17
+ vldmdb v6!, {s2}
+ vldr d9, [\z3, #8*(o3+1)] @ s18,s19
+ vldmia v5!, {s0,s1} @ s0 is unused
+ vldr s7, [\z2, #8*o2] @ t1
+ vmul.f s20, s16, s2 @ vector * scalar
+ vldr s0, [\z3, #8*o3] @ t5
+ vldr s6, [\z2, #8*o2+4] @ t2
+ vldr s3, [\z3, #8*o3+4] @ t6
+ vmul.f s16, s16, s1 @ vector * scalar
+ ldr a4, =\n-1
+1: add \z0, \z0, #8*2
+ .if \n*4*2 >= 512
+ add \z1, \z1, #8*2
+ .endif
+ .if \n*4*2 >= 256
+ add \z2, \z2, #8*2
+ .endif
+ .if \n*4*2 >= 512
+ add \z3, \z3, #8*2
+ .endif
+ @ up to 2 stalls (VFP vector issuing / waiting for s0)
+ @ depending upon whether this is the first iteration and
+ @ how many add instructions are inserted above
+ vadd.f s4, s0, s7 @ t5
+ vadd.f s5, s6, s3 @ t6
+ vsub.f s6, s6, s3 @ t4
+ vsub.f s7, s0, s7 @ t3
+ vldr d6, [\z0, #8*0-8*2] @ s12,s13
+ vadd.f s0, s16, s21 @ t1
+ vldr d7, [\z1, #8*o1-8*2] @ s14,s15
+ vsub.f s1, s18, s23 @ t5
+ vadd.f s8, s4, s12 @ vector + vector
+ @ stall (VFP vector issuing)
+ @ stall (VFP vector issuing)
+ @ stall (VFP vector issuing)
+ vsub.f s4, s12, s4
+ vsub.f s5, s13, s5
+ vsub.f s6, s14, s6
+ vsub.f s7, s15, s7
+ vsub.f s2, s17, s20 @ t2
+ vadd.f s3, s19, s22 @ t6
+ vstr d4, [\z0, #8*0-8*2] @ s8,s9
+ vstr d5, [\z1, #8*o1-8*2] @ s10,s11
+ @ stall (waiting for s5)
+ vstr d2, [\z2, #8*o2-8*2] @ s4,s5
+ vadd.f s4, s1, s0 @ t5
+ vstr d3, [\z3, #8*o3-8*2] @ s6,s7
+ vsub.f s7, s1, s0 @ t3
+ vadd.f s5, s2, s3 @ t6
+ vsub.f s6, s2, s3 @ t4
+ vldr d6, [\z0, #8*1-8*2] @ s12,s13
+ vldr d7, [\z1, #8*(o1+1)-8*2] @ s14,s15
+ vldr d4, [\z2, #8*o2] @ s8,s9
+ vldmdb v6!, {s2,s3}
+ vldr d5, [\z3, #8*o3] @ s10,s11
+ vadd.f s20, s4, s12 @ vector + vector
+ vldmia v5!, {s0,s1}
+ vldr d8, [\z2, #8*(o2+1)] @ s16,s17
+ @ stall (VFP vector issuing)
+ vsub.f s4, s12, s4
+ vsub.f s5, s13, s5
+ vsub.f s6, s14, s6
+ vsub.f s7, s15, s7
+ vmul.f s12, s8, s3 @ vector * scalar
+ vstr d10, [\z0, #8*1-8*2] @ s20,s21
+ vldr d9, [\z3, #8*(o3+1)] @ s18,s19
+ vstr d11, [\z1, #8*(o1+1)-8*2] @ s22,s23
+ vmul.f s8, s8, s0 @ vector * scalar
+ vstr d2, [\z2, #8*(o2+1)-8*2] @ s4,s5
+ @ stall (waiting for s7)
+ vstr d3, [\z3, #8*(o3+1)-8*2] @ s6,s7
+ vmul.f s20, s16, s2 @ vector * scalar
+ @ stall (VFP vector issuing)
+ @ stall (VFP vector issuing)
+ @ stall (VFP vector issuing)
+ vadd.f s7, s8, s13 @ t1
+ vsub.f s6, s9, s12 @ t2
+ vsub.f s0, s10, s15 @ t5
+ vadd.f s3, s11, s14 @ t6
+ vmul.f s16, s16, s1 @ vector * scalar
+ subs a4, a4, #1
+ bne 1b
+ @ What remains is identical to the first two indentations of
+ @ the above, but without the increment of z
+ vadd.f s4, s0, s7 @ t5
+ vadd.f s5, s6, s3 @ t6
+ vsub.f s6, s6, s3 @ t4
+ vsub.f s7, s0, s7 @ t3
+ vldr d6, [\z0, #8*0] @ s12,s13
+ vadd.f s0, s16, s21 @ t1
+ vldr d7, [\z1, #8*o1] @ s14,s15
+ vsub.f s1, s18, s23 @ t5
+ vadd.f s8, s4, s12 @ vector + vector
+ vsub.f s4, s12, s4
+ vsub.f s5, s13, s5
+ vsub.f s6, s14, s6
+ vsub.f s7, s15, s7
+ vsub.f s2, s17, s20 @ t2
+ vadd.f s3, s19, s22 @ t6
+ vstr d4, [\z0, #8*0] @ s8,s9
+ vstr d5, [\z1, #8*o1] @ s10,s11
+ vstr d2, [\z2, #8*o2] @ s4,s5
+ vadd.f s4, s1, s0 @ t5
+ vstr d3, [\z3, #8*o3] @ s6,s7
+ vsub.f s7, s1, s0 @ t3
+ vadd.f s5, s2, s3 @ t6
+ vsub.f s6, s2, s3 @ t4
+ vldr d6, [\z0, #8*1] @ s12,s13
+ vldr d7, [\z1, #8*(o1+1)] @ s14,s15
+ vadd.f s20, s4, s12 @ vector + vector
+ vsub.f s4, s12, s4
+ vsub.f s5, s13, s5
+ vsub.f s6, s14, s6
+ vsub.f s7, s15, s7
+ vstr d10, [\z0, #8*1] @ s20,s21
+ vstr d11, [\z1, #8*(o1+1)] @ s22,s23
+ vstr d2, [\z2, #8*(o2+1)] @ s4,s5
+ vstr d3, [\z3, #8*(o3+1)] @ s6,s7
+.endm
+
+.macro def_fft n, n2, n4
+function .Lfft\n\()_internal_vfp
+ .if \n >= 512
+ push {v1-v6,lr}
+ .elseif \n >= 256
+ push {v1-v2,v5-v6,lr}
+ .else
+ push {v1,v5-v6,lr}
+ .endif
+ mov v1, a1
+ bl .Lfft\n2\()_internal_vfp
+ add a1, v1, #8*(\n/4)*2
+ bl .Lfft\n4\()_internal_vfp
+ movrelx v5, X(ff_cos_\n), a1
+ add a1, v1, #8*(\n/4)*3
+ bl .Lfft\n4\()_internal_vfp
+ .if \n >= 512
+ .set o1, 0*(\n/4/2)
+ .set o2, 0*(\n/4/2)
+ .set o3, 0*(\n/4/2)
+ add v2, v1, #8*2*(\n/4/2)
+ add v3, v1, #8*4*(\n/4/2)
+ add v4, v1, #8*6*(\n/4/2)
+ pass (\n/4/2), v1, v2, v3, v4
+ pop {v1-v6,pc}
+ .elseif \n >= 256
+ .set o1, 2*(\n/4/2)
+ .set o2, 0*(\n/4/2)
+ .set o3, 2*(\n/4/2)
+ add v2, v1, #8*4*(\n/4/2)
+ pass (\n/4/2), v1, v1, v2, v2
+ pop {v1-v2,v5-v6,pc}
+ .else
+ .set o1, 2*(\n/4/2)
+ .set o2, 4*(\n/4/2)
+ .set o3, 6*(\n/4/2)
+ pass (\n/4/2), v1, v1, v1, v1
+ pop {v1,v5-v6,pc}
+ .endif
+endfunc
+
+function fft\n\()_vfp
+ ldr a3, =0x03030000 /* RunFast mode, vector length 4, stride 1 */
+ fmrx a2, FPSCR
+ fmxr FPSCR, a3
+ vpush {s16-s31}
+ mov ip, lr
+ bl .Lfft\n\()_internal_vfp
+ vpop {s16-s31}
+ fmxr FPSCR, a2
+ bx ip
+endfunc
+
+.ltorg
+.endm
+
+ def_fft 32, 16, 8
+ def_fft 64, 32, 16
+ def_fft 128, 64, 32
+ def_fft 256, 128, 64
+ def_fft 512, 256, 128
+ def_fft 1024, 512, 256
+ def_fft 2048, 1024, 512
+ def_fft 4096, 2048, 1024
+ def_fft 8192, 4096, 2048
+ def_fft 16384, 8192, 4096
+ def_fft 32768, 16384, 8192
+ def_fft 65536, 32768, 16384
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 16:41:09 +0000