330 lines
13 KiB
C
330 lines
13 KiB
C
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// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// ARM NEON version of dsp functions and loop filtering.
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//
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// Authors: Somnath Banerjee (somnath@google.com)
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// Johann Koenig (johannkoenig@google.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_NEON)
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#include "../dec/vp8i.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#define QRegs "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", \
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"q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15"
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#define FLIP_SIGN_BIT2(a, b, s) \
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"veor " #a "," #a "," #s " \n" \
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"veor " #b "," #b "," #s " \n" \
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#define FLIP_SIGN_BIT4(a, b, c, d, s) \
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FLIP_SIGN_BIT2(a, b, s) \
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FLIP_SIGN_BIT2(c, d, s) \
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#define NEEDS_FILTER(p1, p0, q0, q1, thresh, mask) \
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"vabd.u8 q15," #p0 "," #q0 " \n" /* abs(p0 - q0) */ \
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"vabd.u8 q14," #p1 "," #q1 " \n" /* abs(p1 - q1) */ \
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"vqadd.u8 q15, q15, q15 \n" /* abs(p0 - q0) * 2 */ \
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"vshr.u8 q14, q14, #1 \n" /* abs(p1 - q1) / 2 */ \
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"vqadd.u8 q15, q15, q14 \n" /* abs(p0 - q0) * 2 + abs(p1 - q1) / 2 */ \
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"vdup.8 q14, " #thresh " \n" \
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"vcge.u8 " #mask ", q14, q15 \n" /* mask <= thresh */
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#define GET_BASE_DELTA(p1, p0, q0, q1, o) \
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"vqsub.s8 q15," #q0 "," #p0 " \n" /* (q0 - p0) */ \
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"vqsub.s8 " #o "," #p1 "," #q1 " \n" /* (p1 - q1) */ \
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"vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 1 * (p0 - q0) */ \
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"vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 2 * (p0 - q0) */ \
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"vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 3 * (p0 - q0) */
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#define DO_SIMPLE_FILTER(p0, q0, fl) \
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"vmov.i8 q15, #0x03 \n" \
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"vqadd.s8 q15, q15, " #fl " \n" /* filter1 = filter + 3 */ \
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"vshr.s8 q15, q15, #3 \n" /* filter1 >> 3 */ \
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"vqadd.s8 " #p0 "," #p0 ", q15 \n" /* p0 += filter1 */ \
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\
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"vmov.i8 q15, #0x04 \n" \
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"vqadd.s8 q15, q15, " #fl " \n" /* filter1 = filter + 4 */ \
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"vshr.s8 q15, q15, #3 \n" /* filter2 >> 3 */ \
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"vqsub.s8 " #q0 "," #q0 ", q15 \n" /* q0 -= filter2 */
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// Applies filter on 2 pixels (p0 and q0)
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#define DO_FILTER2(p1, p0, q0, q1, thresh) \
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NEEDS_FILTER(p1, p0, q0, q1, thresh, q9) /* filter mask in q9 */ \
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"vmov.i8 q10, #0x80 \n" /* sign bit */ \
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FLIP_SIGN_BIT4(p1, p0, q0, q1, q10) /* convert to signed value */ \
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GET_BASE_DELTA(p1, p0, q0, q1, q11) /* get filter level */ \
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"vand q9, q9, q11 \n" /* apply filter mask */ \
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DO_SIMPLE_FILTER(p0, q0, q9) /* apply filter */ \
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FLIP_SIGN_BIT2(p0, q0, q10)
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// Load/Store vertical edge
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#define LOAD8x4(c1, c2, c3, c4, b1, b2, stride) \
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"vld4.8 {" #c1"[0], " #c2"[0], " #c3"[0], " #c4"[0]}," #b1 "," #stride"\n" \
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"vld4.8 {" #c1"[1], " #c2"[1], " #c3"[1], " #c4"[1]}," #b2 "," #stride"\n" \
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"vld4.8 {" #c1"[2], " #c2"[2], " #c3"[2], " #c4"[2]}," #b1 "," #stride"\n" \
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"vld4.8 {" #c1"[3], " #c2"[3], " #c3"[3], " #c4"[3]}," #b2 "," #stride"\n" \
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"vld4.8 {" #c1"[4], " #c2"[4], " #c3"[4], " #c4"[4]}," #b1 "," #stride"\n" \
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"vld4.8 {" #c1"[5], " #c2"[5], " #c3"[5], " #c4"[5]}," #b2 "," #stride"\n" \
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"vld4.8 {" #c1"[6], " #c2"[6], " #c3"[6], " #c4"[6]}," #b1 "," #stride"\n" \
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"vld4.8 {" #c1"[7], " #c2"[7], " #c3"[7], " #c4"[7]}," #b2 "," #stride"\n"
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#define STORE8x2(c1, c2, p,stride) \
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"vst2.8 {" #c1"[0], " #c2"[0]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[1], " #c2"[1]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[2], " #c2"[2]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[3], " #c2"[3]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[4], " #c2"[4]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[5], " #c2"[5]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[6], " #c2"[6]}," #p "," #stride " \n" \
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"vst2.8 {" #c1"[7], " #c2"[7]}," #p "," #stride " \n"
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//-----------------------------------------------------------------------------
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// Simple In-loop filtering (Paragraph 15.2)
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static void SimpleVFilter16NEON(uint8_t* p, int stride, int thresh) {
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__asm__ volatile (
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"sub %[p], %[p], %[stride], lsl #1 \n" // p -= 2 * stride
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"vld1.u8 {q1}, [%[p]], %[stride] \n" // p1
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"vld1.u8 {q2}, [%[p]], %[stride] \n" // p0
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"vld1.u8 {q3}, [%[p]], %[stride] \n" // q0
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"vld1.u8 {q4}, [%[p]] \n" // q1
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DO_FILTER2(q1, q2, q3, q4, %[thresh])
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"sub %[p], %[p], %[stride], lsl #1 \n" // p -= 2 * stride
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"vst1.u8 {q2}, [%[p]], %[stride] \n" // store op0
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"vst1.u8 {q3}, [%[p]] \n" // store oq0
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: [p] "+r"(p)
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: [stride] "r"(stride), [thresh] "r"(thresh)
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: "memory", QRegs
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);
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}
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static void SimpleHFilter16NEON(uint8_t* p, int stride, int thresh) {
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__asm__ volatile (
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"sub r4, %[p], #2 \n" // base1 = p - 2
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"lsl r6, %[stride], #1 \n" // r6 = 2 * stride
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"add r5, r4, %[stride] \n" // base2 = base1 + stride
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LOAD8x4(d2, d3, d4, d5, [r4], [r5], r6)
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LOAD8x4(d6, d7, d8, d9, [r4], [r5], r6)
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"vswp d3, d6 \n" // p1:q1 p0:q3
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"vswp d5, d8 \n" // q0:q2 q1:q4
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"vswp q2, q3 \n" // p1:q1 p0:q2 q0:q3 q1:q4
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DO_FILTER2(q1, q2, q3, q4, %[thresh])
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"sub %[p], %[p], #1 \n" // p - 1
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"vswp d5, d6 \n"
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STORE8x2(d4, d5, [%[p]], %[stride])
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STORE8x2(d6, d7, [%[p]], %[stride])
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: [p] "+r"(p)
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: [stride] "r"(stride), [thresh] "r"(thresh)
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: "memory", "r4", "r5", "r6", QRegs
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);
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}
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static void SimpleVFilter16iNEON(uint8_t* p, int stride, int thresh) {
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int k;
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for (k = 3; k > 0; --k) {
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p += 4 * stride;
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SimpleVFilter16NEON(p, stride, thresh);
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}
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}
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static void SimpleHFilter16iNEON(uint8_t* p, int stride, int thresh) {
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int k;
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for (k = 3; k > 0; --k) {
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p += 4;
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SimpleHFilter16NEON(p, stride, thresh);
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}
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}
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static void TransformOneNEON(const int16_t *in, uint8_t *dst) {
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const int kBPS = BPS;
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const int16_t constants[] = {20091, 17734, 0, 0};
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/* kC1, kC2. Padded because vld1.16 loads 8 bytes
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* Technically these are unsigned but vqdmulh is only available in signed.
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* vqdmulh returns high half (effectively >> 16) but also doubles the value,
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* changing the >> 16 to >> 15 and requiring an additional >> 1.
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* We use this to our advantage with kC2. The canonical value is 35468.
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* However, the high bit is set so treating it as signed will give incorrect
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* results. We avoid this by down shifting by 1 here to clear the highest bit.
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* Combined with the doubling effect of vqdmulh we get >> 16.
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* This can not be applied to kC1 because the lowest bit is set. Down shifting
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* the constant would reduce precision.
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*/
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/* libwebp uses a trick to avoid some extra addition that libvpx does.
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* Instead of:
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* temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16);
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* libwebp adds 1 << 16 to cospi8sqrt2minus1 (kC1). However, this causes the
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* same issue with kC1 and vqdmulh that we work around by down shifting kC2
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*/
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/* Adapted from libvpx: vp8/common/arm/neon/shortidct4x4llm_neon.asm */
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__asm__ volatile (
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"vld1.16 {q1, q2}, [%[in]] \n"
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"vld1.16 {d0}, [%[constants]] \n"
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/* d2: in[0]
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* d3: in[8]
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* d4: in[4]
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* d5: in[12]
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*/
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"vswp d3, d4 \n"
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/* q8 = {in[4], in[12]} * kC1 * 2 >> 16
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* q9 = {in[4], in[12]} * kC2 >> 16
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*/
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"vqdmulh.s16 q8, q2, d0[0] \n"
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"vqdmulh.s16 q9, q2, d0[1] \n"
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/* d22 = a = in[0] + in[8]
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* d23 = b = in[0] - in[8]
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*/
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"vqadd.s16 d22, d2, d3 \n"
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"vqsub.s16 d23, d2, d3 \n"
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/* The multiplication should be x * kC1 >> 16
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* However, with vqdmulh we get x * kC1 * 2 >> 16
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* (multiply, double, return high half)
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* We avoided this in kC2 by pre-shifting the constant.
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* q8 = in[4]/[12] * kC1 >> 16
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*/
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"vshr.s16 q8, q8, #1 \n"
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/* Add {in[4], in[12]} back after the multiplication. This is handled by
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* adding 1 << 16 to kC1 in the libwebp C code.
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*/
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"vqadd.s16 q8, q2, q8 \n"
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/* d20 = c = in[4]*kC2 - in[12]*kC1
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* d21 = d = in[4]*kC1 + in[12]*kC2
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*/
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"vqsub.s16 d20, d18, d17 \n"
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"vqadd.s16 d21, d19, d16 \n"
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/* d2 = tmp[0] = a + d
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* d3 = tmp[1] = b + c
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* d4 = tmp[2] = b - c
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* d5 = tmp[3] = a - d
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*/
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"vqadd.s16 d2, d22, d21 \n"
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"vqadd.s16 d3, d23, d20 \n"
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"vqsub.s16 d4, d23, d20 \n"
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"vqsub.s16 d5, d22, d21 \n"
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"vzip.16 q1, q2 \n"
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"vzip.16 q1, q2 \n"
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"vswp d3, d4 \n"
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/* q8 = {tmp[4], tmp[12]} * kC1 * 2 >> 16
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* q9 = {tmp[4], tmp[12]} * kC2 >> 16
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*/
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"vqdmulh.s16 q8, q2, d0[0] \n"
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"vqdmulh.s16 q9, q2, d0[1] \n"
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/* d22 = a = tmp[0] + tmp[8]
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* d23 = b = tmp[0] - tmp[8]
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*/
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"vqadd.s16 d22, d2, d3 \n"
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"vqsub.s16 d23, d2, d3 \n"
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/* See long winded explanations prior */
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"vshr.s16 q8, q8, #1 \n"
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"vqadd.s16 q8, q2, q8 \n"
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/* d20 = c = in[4]*kC2 - in[12]*kC1
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* d21 = d = in[4]*kC1 + in[12]*kC2
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*/
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"vqsub.s16 d20, d18, d17 \n"
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"vqadd.s16 d21, d19, d16 \n"
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/* d2 = tmp[0] = a + d
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* d3 = tmp[1] = b + c
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* d4 = tmp[2] = b - c
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* d5 = tmp[3] = a - d
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*/
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"vqadd.s16 d2, d22, d21 \n"
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"vqadd.s16 d3, d23, d20 \n"
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"vqsub.s16 d4, d23, d20 \n"
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"vqsub.s16 d5, d22, d21 \n"
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"vld1.32 d6[0], [%[dst]], %[kBPS] \n"
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"vld1.32 d6[1], [%[dst]], %[kBPS] \n"
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"vld1.32 d7[0], [%[dst]], %[kBPS] \n"
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"vld1.32 d7[1], [%[dst]], %[kBPS] \n"
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"sub %[dst], %[dst], %[kBPS], lsl #2 \n"
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/* (val) + 4 >> 3 */
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"vrshr.s16 d2, d2, #3 \n"
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"vrshr.s16 d3, d3, #3 \n"
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"vrshr.s16 d4, d4, #3 \n"
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"vrshr.s16 d5, d5, #3 \n"
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"vzip.16 q1, q2 \n"
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"vzip.16 q1, q2 \n"
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|
|
/* Must accumulate before saturating */
|
||
|
|
"vmovl.u8 q8, d6 \n"
|
||
|
|
"vmovl.u8 q9, d7 \n"
|
||
|
|
|
||
|
|
"vqadd.s16 q1, q1, q8 \n"
|
||
|
|
"vqadd.s16 q2, q2, q9 \n"
|
||
|
|
|
||
|
|
"vqmovun.s16 d0, q1 \n"
|
||
|
|
"vqmovun.s16 d1, q2 \n"
|
||
|
|
|
||
|
|
"vst1.32 d0[0], [%[dst]], %[kBPS] \n"
|
||
|
|
"vst1.32 d0[1], [%[dst]], %[kBPS] \n"
|
||
|
|
"vst1.32 d1[0], [%[dst]], %[kBPS] \n"
|
||
|
|
"vst1.32 d1[1], [%[dst]] \n"
|
||
|
|
|
||
|
|
: [in] "+r"(in), [dst] "+r"(dst) /* modified registers */
|
||
|
|
: [kBPS] "r"(kBPS), [constants] "r"(constants) /* constants */
|
||
|
|
: "memory", "q0", "q1", "q2", "q8", "q9", "q10", "q11" /* clobbered */
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void TransformTwoNEON(const int16_t* in, uint8_t* dst, int do_two) {
|
||
|
|
TransformOneNEON(in, dst);
|
||
|
|
if (do_two) {
|
||
|
|
TransformOneNEON(in + 16, dst + 4);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
extern void VP8DspInitNEON(void);
|
||
|
|
|
||
|
|
void VP8DspInitNEON(void) {
|
||
|
|
VP8Transform = TransformTwoNEON;
|
||
|
|
|
||
|
|
VP8SimpleVFilter16 = SimpleVFilter16NEON;
|
||
|
|
VP8SimpleHFilter16 = SimpleHFilter16NEON;
|
||
|
|
VP8SimpleVFilter16i = SimpleVFilter16iNEON;
|
||
|
|
VP8SimpleHFilter16i = SimpleHFilter16iNEON;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
||
|
|
} // extern "C"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // WEBP_USE_NEON
|