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Diffstat (limited to 'third_party/libwebp/dsp/dec_neon.c')
| -rw-r--r-- | third_party/libwebp/dsp/dec_neon.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/third_party/libwebp/dsp/dec_neon.c b/third_party/libwebp/dsp/dec_neon.c new file mode 100644 index 0000000..e633a30 --- /dev/null +++ b/third_party/libwebp/dsp/dec_neon.c @@ -0,0 +1,168 @@ +// Copyright 2011 Google Inc. +// +// This code is licensed under the same terms as WebM: +// Software License Agreement: http://www.webmproject.org/license/software/ +// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ +// ----------------------------------------------------------------------------- +// +// ARM NEON version of dsp functions and loop filtering. +// +// Author: somnath@google.com (Somnath Banerjee) + +#if defined(__GNUC__) && defined(__ARM_NEON__) + +#include "../dec/vp8i.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define QRegs "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", \ + "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15" + +#define FLIP_SIGN_BIT2(a, b, s) \ + "veor " #a "," #a "," #s " \n" \ + "veor " #b "," #b "," #s " \n" \ + +#define FLIP_SIGN_BIT4(a, b, c, d, s) \ + FLIP_SIGN_BIT2(a, b, s) \ + FLIP_SIGN_BIT2(c, d, s) \ + +#define NEEDS_FILTER(p1, p0, q0, q1, thresh, mask) \ + "vabd.u8 q15," #p0 "," #q0 " \n" /* abs(p0 - q0) */ \ + "vabd.u8 q14," #p1 "," #q1 " \n" /* abs(p1 - q1) */ \ + "vqadd.u8 q15, q15, q15 \n" /* abs(p0 - q0) * 2 */ \ + "vshr.u8 q14, q14, #1 \n" /* abs(p1 - q1) / 2 */ \ + "vqadd.u8 q15, q15, q14 \n" /* abs(p0 - q0) * 2 + abs(p1 - q1) / 2 */ \ + "vdup.8 q14, " #thresh " \n" \ + "vcge.u8 " #mask ", q14, q15 \n" /* mask <= thresh */ + +#define GET_BASE_DELTA(p1, p0, q0, q1, o) \ + "vqsub.s8 q15," #q0 "," #p0 " \n" /* (q0 - p0) */ \ + "vqsub.s8 " #o "," #p1 "," #q1 " \n" /* (p1 - q1) */ \ + "vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 1 * (p0 - q0) */ \ + "vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 2 * (p0 - q0) */ \ + "vqadd.s8 " #o "," #o ", q15 \n" /* (p1 - q1) + 3 * (p0 - q0) */ + +#define DO_SIMPLE_FILTER(p0, q0, fl) \ + "vmov.i8 q15, #0x03 \n" \ + "vqadd.s8 q15, q15, " #fl " \n" /* filter1 = filter + 3 */ \ + "vshr.s8 q15, q15, #3 \n" /* filter1 >> 3 */ \ + "vqadd.s8 " #p0 "," #p0 ", q15 \n" /* p0 += filter1 */ \ + \ + "vmov.i8 q15, #0x04 \n" \ + "vqadd.s8 q15, q15, " #fl " \n" /* filter1 = filter + 4 */ \ + "vshr.s8 q15, q15, #3 \n" /* filter2 >> 3 */ \ + "vqsub.s8 " #q0 "," #q0 ", q15 \n" /* q0 -= filter2 */ + +// Applies filter on 2 pixels (p0 and q0) +#define DO_FILTER2(p1, p0, q0, q1, thresh) \ + NEEDS_FILTER(p1, p0, q0, q1, thresh, q9) /* filter mask in q9 */ \ + "vmov.i8 q10, #0x80 \n" /* sign bit */ \ + FLIP_SIGN_BIT4(p1, p0, q0, q1, q10) /* convert to signed value */ \ + GET_BASE_DELTA(p1, p0, q0, q1, q11) /* get filter level */ \ + "vand q9, q9, q11 \n" /* apply filter mask */ \ + DO_SIMPLE_FILTER(p0, q0, q9) /* apply filter */ \ + FLIP_SIGN_BIT2(p0, q0, q10) + +// Load/Store vertical edge +#define LOAD8x4(c1, c2, c3, c4, b1, b2, stride) \ + "vld4.8 {" #c1"[0], " #c2"[0], " #c3"[0], " #c4"[0]}," #b1 "," #stride"\n" \ + "vld4.8 {" #c1"[1], " #c2"[1], " #c3"[1], " #c4"[1]}," #b2 "," #stride"\n" \ + "vld4.8 {" #c1"[2], " #c2"[2], " #c3"[2], " #c4"[2]}," #b1 "," #stride"\n" \ + "vld4.8 {" #c1"[3], " #c2"[3], " #c3"[3], " #c4"[3]}," #b2 "," #stride"\n" \ + "vld4.8 {" #c1"[4], " #c2"[4], " #c3"[4], " #c4"[4]}," #b1 "," #stride"\n" \ + "vld4.8 {" #c1"[5], " #c2"[5], " #c3"[5], " #c4"[5]}," #b2 "," #stride"\n" \ + "vld4.8 {" #c1"[6], " #c2"[6], " #c3"[6], " #c4"[6]}," #b1 "," #stride"\n" \ + "vld4.8 {" #c1"[7], " #c2"[7], " #c3"[7], " #c4"[7]}," #b2 "," #stride"\n" + +#define STORE8x2(c1, c2, p,stride) \ + "vst2.8 {" #c1"[0], " #c2"[0]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[1], " #c2"[1]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[2], " #c2"[2]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[3], " #c2"[3]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[4], " #c2"[4]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[5], " #c2"[5]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[6], " #c2"[6]}," #p "," #stride " \n" \ + "vst2.8 {" #c1"[7], " #c2"[7]}," #p "," #stride " \n" + +//----------------------------------------------------------------------------- +// Simple In-loop filtering (Paragraph 15.2) + +static void SimpleVFilter16NEON(uint8_t* p, int stride, int thresh) { + __asm__ volatile ( + "sub %[p], %[p], %[stride], lsl #1 \n" // p -= 2 * stride + + "vld1.u8 {q1}, [%[p]], %[stride] \n" // p1 + "vld1.u8 {q2}, [%[p]], %[stride] \n" // p0 + "vld1.u8 {q3}, [%[p]], %[stride] \n" // q0 + "vld1.u8 {q4}, [%[p]] \n" // q1 + + DO_FILTER2(q1, q2, q3, q4, %[thresh]) + + "sub %[p], %[p], %[stride], lsl #1 \n" // p -= 2 * stride + + "vst1.u8 {q2}, [%[p]], %[stride] \n" // store op0 + "vst1.u8 {q3}, [%[p]] \n" // store oq0 + : [p] "+r"(p) + : [stride] "r"(stride), [thresh] "r"(thresh) + : "memory", QRegs + ); +} + +static void SimpleHFilter16NEON(uint8_t* p, int stride, int thresh) { + __asm__ volatile ( + "sub r4, %[p], #2 \n" // base1 = p - 2 + "lsl r6, %[stride], #1 \n" // r6 = 2 * stride + "add r5, r4, %[stride] \n" // base2 = base1 + stride + + LOAD8x4(d2, d3, d4, d5, [r4], [r5], r6) + LOAD8x4(d6, d7, d8, d9, [r4], [r5], r6) + "vswp d3, d6 \n" // p1:q1 p0:q3 + "vswp d5, d8 \n" // q0:q2 q1:q4 + "vswp q2, q3 \n" // p1:q1 p0:q2 q0:q3 q1:q4 + + DO_FILTER2(q1, q2, q3, q4, %[thresh]) + + "sub %[p], %[p], #1 \n" // p - 1 + + "vswp d5, d6 \n" + STORE8x2(d4, d5, [%[p]], %[stride]) + STORE8x2(d6, d7, [%[p]], %[stride]) + + : [p] "+r"(p) + : [stride] "r"(stride), [thresh] "r"(thresh) + : "memory", "r4", "r5", "r6", QRegs + ); +} + +static void SimpleVFilter16iNEON(uint8_t* p, int stride, int thresh) { + int k; + for (k = 3; k > 0; --k) { + p += 4 * stride; + SimpleVFilter16NEON(p, stride, thresh); + } +} + +static void SimpleHFilter16iNEON(uint8_t* p, int stride, int thresh) { + int k; + for (k = 3; k > 0; --k) { + p += 4; + SimpleHFilter16NEON(p, stride, thresh); + } +} + +extern void VP8DspInitNEON(void); + +void VP8DspInitNEON(void) { + VP8SimpleVFilter16 = SimpleVFilter16NEON; + VP8SimpleHFilter16 = SimpleHFilter16NEON; + VP8SimpleVFilter16i = SimpleVFilter16iNEON; + VP8SimpleHFilter16i = SimpleHFilter16iNEON; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} // extern "C" +#endif + +#endif // __GNUC__ && __ARM_NEON__ |