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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define ENTRY(f) .text; .align 4; .globl f; .type f,#function; f:
#define END(f) .size f, .-f;
/* Perform the actual YuvToRGB conversion in a macro, from register to
* register. This macro will be called from within several different wrapper
* variants for different data layouts. Y data starts with the even and odd
* bytes split into the low parts of v8 and v9 respectively. U and V are in
* v10 and v11. Working constants are pre-loaded into v24-v31, and v3 and v7
* are pre-loaded with a constant 0xff alpha channel.
*
* The complicated arithmetic is the result of refactoring the original
* equations to avoid 16-bit overflow without losing any precision.
*/
.macro yuvkern, regu=v10, regv=v11
/* v0 out R_lo / even R_lo accumulator
* v1 out G_lo / even G_lo accumulator
* v2 out B_lo / even B_lo accumulator
* v3 out A_lo / const 0xff*ff
* v4 out R_hi / even R_hi accumulator
* v5 out G_hi / even G_hi accumulator
* v6 out B_hi / even B_hi accumulator
* v7 out A_hi / const 0xff*ff
* v8 even Y / G_lo luma tmp
* v9 odd Y / G_lo luma tmp
* \regu in U
* \regv in V
* v12 R_lo luma tmp
* v13 B_lo luma tmp
* v14 R_hi luma tmp
* v15 B_hi luma tmp
* v16 odd R_lo accumulator
* v17 odd G_lo accumulator
* v18 odd B_lo accumulator
* v19 multiplier extra bits low
* v20 odd R_hi accumulator
* v21 odd G_hi accumulator
* v22 odd B_hi accumulator
* v23 multiplier extra bits high
* v24 constant 149
* v25 constant 50
* v26 constant 104
* v27 constant 204
* v28 constant 254
* v29 constant ((16 * 149 + (128 >> 1) + 128 * 204) >> 1)
* v30 constant ((-16 * 149 + 128 * 50 + 128 * 104) >> 0)
* v31 constant ((16 * 149 + (128 << 2) + 128 * 254) >> 1)
*/
umull v1.8h, v8.8b, v24.8b // g0 = y0 * 149
umull v17.8h, v9.8b, v24.8b // g1 = y1 * 149
umull2 v5.8h, v8.16b, v24.16b // g0_hi = y0_hi * 149
umull2 v21.8h, v9.16b, v24.16b // g1_hi = y1_hi * 149
umull v8.8h, \regu\().8b, v25.8b // g2 = u * 50 + v * 104
umlal v8.8h, \regv\().8b, v26.8b
umull2 v9.8h, \regu\().16b, v25.16b // g2_hi = u_hi * 50 + v_hi * 104
umlal2 v9.8h, \regv\().16b, v26.16b
ushr v19.16b, \regv\().16b, #1
uaddw v0.8h, v1.8h, v19.8b // r0 = g0 + (v >> 1)
uaddw v16.8h, v17.8h, v19.8b // r1 = g1 + (v >> 1)
uaddw2 v4.8h, v5.8h, v19.16b // r0_hi = g0_hi + (v_hi >> 1)
uaddw2 v20.8h, v21.8h, v19.16b // r1_hi = g1_hi + (v_hi >> 1)
ushll v19.8h, \regu\().8b, #2
ushll2 v23.8h, \regu\().16b, #2
add v2.8h, v1.8h, v19.8h // b0 = g0 + (u << 2)
add v18.8h, v17.8h, v19.8h // b1 = g1 + (u << 2)
add v6.8h, v5.8h, v23.8h // b0_hi = g0_hi + (u_hi << 2)
add v22.8h, v21.8h, v23.8h // b1_hi = g1_hi + (u_hi << 2)
umull v12.8h, \regv\().8b, v27.8b // r2 = v * 204
umull v13.8h, \regu\().8b, v28.8b // b2 = u * 254
umull2 v14.8h, \regv\().16b, v27.16b // r2_hi = v_hi * 204
umull2 v15.8h, \regu\().16b, v28.16b // b2_hi = u_hi * 254
uhadd v0.8h, v0.8h, v12.8h // r0 = (r0 + r2) >> 1
uhadd v16.8h, v16.8h, v12.8h // r1 = (r1 + r2) >> 1
uqadd v1.8h, v1.8h, v30.8h // g0 = satu16(g0 + (-16 * 149 + 128 * 50 + 128 * 104) >> 0)
uqadd v17.8h, v17.8h, v30.8h // g1 = satu16(g1 + (-16 * 149 + 128 * 50 + 128 * 104) >> 0)
uhadd v2.8h, v2.8h, v13.8h // b0 = (b0 + b2) >> 1
uhadd v18.8h, v18.8h, v13.8h // b1 = (b1 + b2) >> 1
uhadd v4.8h, v4.8h, v14.8h // r0_hi = (r0_hi + r2_hi) >> 1
uhadd v20.8h, v20.8h, v14.8h // r1_hi = (r1_hi + r2_hi) >> 1
uqadd v5.8h, v5.8h, v30.8h // g0_hi = satu16(g0_hi + (-16 * 149 + 128 * 50 + 128 * 104) >> 0)
uqadd v21.8h, v21.8h, v30.8h // g1_hi = satu16(g1_hi + (-16 * 149 + 128 * 50 + 128 * 104) >> 0)
uhadd v6.8h, v6.8h, v15.8h // b0_hi = (b0_hi + b2_hi) >> 1
uhadd v22.8h, v22.8h, v15.8h // b1_hi = (b1_hi + b2_hi) >> 1
uqsub v0.8h, v0.8h, v29.8h // r0 = satu16(r0 - (16 * 149 + (128 >> 1) + 128 * 204) >> 1)
uqsub v16.8h, v16.8h, v29.8h // r1 = satu16(r1 - (16 * 149 + (128 >> 1) + 128 * 204) >> 1)
uqsub v1.8h, v1.8h, v8.8h // g0 = satu16(g0 - g2)
uqsub v17.8h, v17.8h, v8.8h // g1 = satu16(g1 - g2)
uqsub v2.8h, v2.8h, v31.8h // b0 = satu16(b0 - (16 * 149 + (128 << 2) + 128 * 254) >> 1)
uqsub v18.8h, v18.8h, v31.8h // b1 = satu16(b1 - (16 * 149 + (128 << 2) + 128 * 254) >> 1)
uqsub v4.8h, v4.8h, v29.8h // r0_hi = satu16(r0_hi - (16 * 149 + (128 >> 1) + 128 * 204) >> 1)
uqsub v20.8h, v20.8h, v29.8h // r1_hi = satu16(r1_hi - (16 * 149 + (128 >> 1) + 128 * 204) >> 1)
uqsub v5.8h, v5.8h, v9.8h // g0_hi = satu16(g0_hi - g2_hi)
uqsub v21.8h, v21.8h, v9.8h // g1_hi = satu16(g1_hi - g2_hi)
uqsub v6.8h, v6.8h, v31.8h // b0_hi = satu16(b0_hi - (16 * 149 + (128 << 2) + 128 * 254) >> 1)
uqsub v22.8h, v22.8h, v31.8h // b1_hi = satu16(b1_hi - (16 * 149 + (128 << 2) + 128 * 254) >> 1)
uqrshrn v0.8b, v0.8h, #6
uqrshrn v16.8b, v16.8h, #6
uqrshrn v1.8b, v1.8h, #7
uqrshrn v17.8b, v17.8h, #7
uqrshrn v2.8b, v2.8h, #6
uqrshrn v18.8b, v18.8h, #6
uqrshrn v4.8b, v4.8h, #6
uqrshrn v20.8b, v20.8h, #6
uqrshrn v5.8b, v5.8h, #7
uqrshrn v21.8b, v21.8h, #7
uqrshrn v6.8b, v6.8h, #6
uqrshrn v22.8b, v22.8h, #6
zip1 v0.16b, v0.16b, v16.16b
zip1 v1.16b, v1.16b, v17.16b
zip1 v2.16b, v2.16b, v18.16b
zip1 v4.16b, v4.16b, v20.16b
zip1 v5.16b, v5.16b, v21.16b
zip1 v6.16b, v6.16b, v22.16b
.endm
/* Define the wrapper code which will load and store the data, iterate the
* correct number of times, and safely handle the remainder at the end of the
* loop. Some sections of code are switched out depending on the data packing
* being handled.
*/
.macro wrap_line kernel, interleaved=0, swapuv=0
movi v24.16b, #149
movi v25.16b, #50
movi v26.16b, #104
movi v27.16b, #204
movi v28.16b, #254
mov w5, #((16 * 149 + (128 >> 1) + 128 * 204) >> 1)
dup v29.8h, w5
mov w5, #((-16 * 149 + 128 * 50 + 128 * 104) >> 0)
dup v30.8h, w5
mov w5, #((16 * 149 + (128 << 2) + 128 * 254) >> 1)
dup v31.8h, w5
movi v3.16b, #0xff
movi v7.16b, #0xff
subs x2, x2, #32
bhs 1f
b 2f
.align 4
1: ld2 {v8.16b,v9.16b}, [x1], #32
.if \interleaved
ld2 {v10.16b,v11.16b}, [x3], #32
.else
ld1 {v10.16b}, [x3], #16
ld1 {v11.16b}, [x4], #16
.endif
.if \swapuv
\kernel regu=v11, regv=v10
.else
\kernel
.endif
subs x2, x2, #32
st4 {v0.16b - v3.16b}, [x0], #64
st4 {v4.16b - v7.16b}, [x0], #64
bhs 1b
2: adds x2, x2, #32
beq 2f
/* To handle the tail portion of the data (something less than 32
* bytes) load small power-of-two chunks into working registers. It
* doesn't matter where they end up in the register; the same process
* will store them back out using the same positions and the
* interaction between neighbouring pixels is constrained to odd
* boundaries where the load operations don't interfere.
*/
movi v8.8b, #0
movi v9.8b, #0
movi v10.8b, #0
movi v11.8b, #0
tbz x2, #4, 1f
ld1 {v9.16b}, [x1], #16
.if \interleaved
ld1 {v11.16b}, [x3], #16
.else
ld1 {v10.d}[1], [x3], #8
ld1 {v11.d}[1], [x4], #8
.endif
1: tbz x2, #3, 1f
ld1 {v8.d}[1], [x1], #8
.if \interleaved
ld1 {v10.d}[1], [x3], #8
.else
ld1 {v10.s}[1], [x3], #4
ld1 {v11.s}[1], [x4], #4
.endif
1: tbz x2, #2, 1f
ld1 {v8.s}[1], [x1], #4
.if \interleaved
ld1 {v10.s}[1], [x3], #4
.else
ld1 {v10.h}[1], [x3], #2
ld1 {v11.h}[1], [x4], #2
.endif
1: tbz x2, #1, 1f
ld1 {v8.h}[1], [x1], #2
.if \interleaved
ld1 {v10.h}[1], [x3], #2
.else
ld1 {v10.b}[1], [x3], #1
ld1 {v11.b}[1], [x4], #1
.endif
1: tbz x2, #0, 1f
ld1 {v8.b}[1], [x1], #1
.if \interleaved
ld1 {v10.h}[0], [x3], #2
.else
ld1 {v10.b}[0], [x3], #1
ld1 {v11.b}[0], [x4], #1
.endif
/* One small impediment in the process above is that some of the load
* operations can't perform byte-wise structure deinterleaving at the
* same time as loading only part of a register. So the data is loaded
* linearly and unpacked manually at this point if necessary.
*/
1: mov v12.16b, v8.16b
uzp1 v8.16b, v12.16b, v9.16b
uzp2 v9.16b, v12.16b, v9.16b
.if \interleaved
mov v12.16b, v10.16b
uzp1 v10.16b, v12.16b, v11.16b
uzp2 v11.16b, v12.16b, v11.16b
.endif
.if \swapuv
\kernel regu=v11, regv=v10
.else
\kernel
.endif
/* As above but with the output; structured stores for partial vectors
* aren't available, so the data is re-packed first and stored linearly.
*/
zip1 v16.16b, v0.16b, v2.16b
zip2 v18.16b, v0.16b, v2.16b
zip1 v17.16b, v1.16b, v3.16b
zip2 v19.16b, v1.16b, v3.16b
zip1 v0.16b, v16.16b, v17.16b
zip2 v1.16b, v16.16b, v17.16b
zip1 v2.16b, v18.16b, v19.16b
zip2 v3.16b, v18.16b, v19.16b
/* Luckily v4-v7 don't need to be unzipped because the complete set of
* four and can be stored using st4. */
tbz x2, #4, 1f
st4 {v4.16b - v7.16b}, [x0], #64
1: tbz x2, #3, 1f
st1 {v2.16b,v3.16b}, [x0], #32
1: tbz x2, #2, 1f
st1 {v1.16b}, [x0], #16
1: tbz x2, #1, 1f
st1 {v0.d}[1], [x0], #8
1: tbz x2, #0, 2f
st1 {v0.s}[1], [x0], #4
2:
.endm
/* void rsdIntrinsicYuv2_K(
* void *out, // x0
* void const *yin, // x1
* void const *uin, // x2
* void const *vin, // x3
* size_t xstart, // x4
* size_t xend); // x5
*/
ENTRY(rsdIntrinsicYuv2_K)
lsr x6, x4, #1
add x0, x0, x4, LSL #2
add x1, x1, x4
add x4, x3, x6
add x3, x2, x6
sub x2, x5, x6, LSL #1
sub x6, sp, #32
sub sp, sp, #64
st1 {v8.1d - v11.1d}, [sp]
st1 {v12.1d - v15.1d}, [x6]
wrap_line yuvkern, 0
ld1 {v8.1d - v11.1d}, [sp], #32
ld1 {v12.1d - v15.1d}, [sp], #32
ret
END(rsdIntrinsicYuv2_K)
/* void rsdIntrinsicYuv_K(
* void *out, // x0
* void const *yin, // x1
* void const *uvin, // x2
* size_t xstart, // x3
* size_t xend); // x4
*/
ENTRY(rsdIntrinsicYuv_K)
bic x5, x3, #1
add x0, x0, x5, LSL #2
add x1, x1, x5
add x3, x2, x5
sub x2, x4, x5
sub x5, sp, #32
sub sp, sp, #64
st1 {v8.1d - v11.1d}, [sp]
st1 {v12.1d - v15.1d}, [x5]
wrap_line yuvkern, 1, 1
ld1 {v8.1d - v11.1d}, [sp], #32
ld1 {v12.1d - v15.1d}, [sp], #32
ret
END(rsdIntrinsicYuv_K)
/* void rsdIntrinsicYuvR_K(
* void *out, // x0
* void const *yin, // x1
* void const *uvin, // x2
* size_t xstart, // x3
* size_t xend); // x4
*/
ENTRY(rsdIntrinsicYuvR_K)
bic x5, x3, #1
add x0, x0, x5, LSL #2
add x1, x1, x5
add x3, x2, x5
sub x2, x4, x5
sub x5, sp, #32
sub sp, sp, #64
st1 {v8.1d - v11.1d}, [sp]
st1 {v12.1d - v15.1d}, [x5]
wrap_line yuvkern, 1
ld1 {v8.1d - v11.1d}, [sp], #32
ld1 {v12.1d - v15.1d}, [sp], #32
ret
END(rsdIntrinsicYuvR_K)
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