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Unified Diff: source/libvpx/vp9/common/arm/neon/vp9_loopfilter_16_neon_asm.asm

Issue 812033011: libvpx: Pull from upstream (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/libvpx/
Patch Set: Created 5 years, 11 months ago
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Index: source/libvpx/vp9/common/arm/neon/vp9_loopfilter_16_neon_asm.asm
===================================================================
--- source/libvpx/vp9/common/arm/neon/vp9_loopfilter_16_neon_asm.asm (revision 0)
+++ source/libvpx/vp9/common/arm/neon/vp9_loopfilter_16_neon_asm.asm (working copy)
@@ -0,0 +1,199 @@
+;
+; Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+;
+; Use of this source code is governed by a BSD-style license
+; that can be found in the LICENSE file in the root of the source
+; tree. An additional intellectual property rights grant can be found
+; in the file PATENTS. All contributing project authors may
+; be found in the AUTHORS file in the root of the source tree.
+;
+
+ EXPORT |vp9_lpf_horizontal_4_dual_neon|
+ ARM
+
+ AREA ||.text||, CODE, READONLY, ALIGN=2
+
+;void vp9_lpf_horizontal_4_dual_neon(uint8_t *s, int p,
+; const uint8_t *blimit0,
+; const uint8_t *limit0,
+; const uint8_t *thresh0,
+; const uint8_t *blimit1,
+; const uint8_t *limit1,
+; const uint8_t *thresh1)
+; r0 uint8_t *s,
+; r1 int p,
+; r2 const uint8_t *blimit0,
+; r3 const uint8_t *limit0,
+; sp const uint8_t *thresh0,
+; sp+4 const uint8_t *blimit1,
+; sp+8 const uint8_t *limit1,
+; sp+12 const uint8_t *thresh1,
+
+|vp9_lpf_horizontal_4_dual_neon| PROC
+ push {lr}
+
+ ldr r12, [sp, #4] ; load thresh0
+ vld1.8 {d0}, [r2] ; load blimit0 to first half q
+ vld1.8 {d2}, [r3] ; load limit0 to first half q
+
+ add r1, r1, r1 ; double pitch
+ ldr r2, [sp, #8] ; load blimit1
+
+ vld1.8 {d4}, [r12] ; load thresh0 to first half q
+
+ ldr r3, [sp, #12] ; load limit1
+ ldr r12, [sp, #16] ; load thresh1
+ vld1.8 {d1}, [r2] ; load blimit1 to 2nd half q
+
+ sub r2, r0, r1, lsl #1 ; s[-4 * p]
+
+ vld1.8 {d3}, [r3] ; load limit1 to 2nd half q
+ vld1.8 {d5}, [r12] ; load thresh1 to 2nd half q
+
+ vpush {d8-d15} ; save neon registers
+
+ add r3, r2, r1, lsr #1 ; s[-3 * p]
+
+ vld1.u8 {q3}, [r2@64], r1 ; p3
+ vld1.u8 {q4}, [r3@64], r1 ; p2
+ vld1.u8 {q5}, [r2@64], r1 ; p1
+ vld1.u8 {q6}, [r3@64], r1 ; p0
+ vld1.u8 {q7}, [r2@64], r1 ; q0
+ vld1.u8 {q8}, [r3@64], r1 ; q1
+ vld1.u8 {q9}, [r2@64] ; q2
+ vld1.u8 {q10}, [r3@64] ; q3
+
+ sub r2, r2, r1, lsl #1
+ sub r3, r3, r1, lsl #1
+
+ bl vp9_loop_filter_neon_16
+
+ vst1.u8 {q5}, [r2@64], r1 ; store op1
+ vst1.u8 {q6}, [r3@64], r1 ; store op0
+ vst1.u8 {q7}, [r2@64], r1 ; store oq0
+ vst1.u8 {q8}, [r3@64], r1 ; store oq1
+
+ vpop {d8-d15} ; restore neon registers
+
+ pop {pc}
+ ENDP ; |vp9_lpf_horizontal_4_dual_neon|
+
+; void vp9_loop_filter_neon_16();
+; This is a helper function for the loopfilters. The invidual functions do the
+; necessary load, transpose (if necessary) and store. This function uses
+; registers d8-d15, so the calling function must save those registers.
+;
+; r0-r3, r12 PRESERVE
+; q0 blimit
+; q1 limit
+; q2 thresh
+; q3 p3
+; q4 p2
+; q5 p1
+; q6 p0
+; q7 q0
+; q8 q1
+; q9 q2
+; q10 q3
+;
+; Outputs:
+; q5 op1
+; q6 op0
+; q7 oq0
+; q8 oq1
+|vp9_loop_filter_neon_16| PROC
+
+ ; filter_mask
+ vabd.u8 q11, q3, q4 ; m1 = abs(p3 - p2)
+ vabd.u8 q12, q4, q5 ; m2 = abs(p2 - p1)
+ vabd.u8 q13, q5, q6 ; m3 = abs(p1 - p0)
+ vabd.u8 q14, q8, q7 ; m4 = abs(q1 - q0)
+ vabd.u8 q3, q9, q8 ; m5 = abs(q2 - q1)
+ vabd.u8 q4, q10, q9 ; m6 = abs(q3 - q2)
+
+ ; only compare the largest value to limit
+ vmax.u8 q11, q11, q12 ; m7 = max(m1, m2)
+ vmax.u8 q12, q13, q14 ; m8 = max(m3, m4)
+
+ vabd.u8 q9, q6, q7 ; abs(p0 - q0)
+
+ vmax.u8 q3, q3, q4 ; m9 = max(m5, m6)
+
+ vmov.u8 q10, #0x80
+
+ vmax.u8 q15, q11, q12 ; m10 = max(m7, m8)
+
+ vcgt.u8 q13, q13, q2 ; (abs(p1 - p0) > thresh)*-1
+ vcgt.u8 q14, q14, q2 ; (abs(q1 - q0) > thresh)*-1
+ vmax.u8 q15, q15, q3 ; m11 = max(m10, m9)
+
+ vabd.u8 q2, q5, q8 ; a = abs(p1 - q1)
+ vqadd.u8 q9, q9, q9 ; b = abs(p0 - q0) * 2
+
+ veor q7, q7, q10 ; qs0
+
+ vcge.u8 q15, q1, q15 ; abs(m11) > limit
+
+ vshr.u8 q2, q2, #1 ; a = a / 2
+ veor q6, q6, q10 ; ps0
+
+ veor q5, q5, q10 ; ps1
+ vqadd.u8 q9, q9, q2 ; a = b + a
+
+ veor q8, q8, q10 ; qs1
+
+ vmov.u16 q4, #3
+
+ vsubl.s8 q2, d14, d12 ; ( qs0 - ps0)
+ vsubl.s8 q11, d15, d13
+
+ vcge.u8 q9, q0, q9 ; a > blimit
+
+ vqsub.s8 q1, q5, q8 ; filter = clamp(ps1-qs1)
+ vorr q14, q13, q14 ; hev
+
+ vmul.i16 q2, q2, q4 ; 3 * ( qs0 - ps0)
+ vmul.i16 q11, q11, q4
+
+ vand q1, q1, q14 ; filter &= hev
+ vand q15, q15, q9 ; mask
+
+ vmov.u8 q4, #3
+
+ vaddw.s8 q2, q2, d2 ; filter + 3 * (qs0 - ps0)
+ vaddw.s8 q11, q11, d3
+
+ vmov.u8 q9, #4
+
+ ; filter = clamp(filter + 3 * ( qs0 - ps0))
+ vqmovn.s16 d2, q2
+ vqmovn.s16 d3, q11
+ vand q1, q1, q15 ; filter &= mask
+
+ vqadd.s8 q2, q1, q4 ; filter2 = clamp(filter+3)
+ vqadd.s8 q1, q1, q9 ; filter1 = clamp(filter+4)
+ vshr.s8 q2, q2, #3 ; filter2 >>= 3
+ vshr.s8 q1, q1, #3 ; filter1 >>= 3
+
+
+ vqadd.s8 q11, q6, q2 ; u = clamp(ps0 + filter2)
+ vqsub.s8 q0, q7, q1 ; u = clamp(qs0 - filter1)
+
+ ; outer tap adjustments
+ vrshr.s8 q1, q1, #1 ; filter = ++filter1 >> 1
+
+ veor q7, q0, q10 ; *oq0 = u^0x80
+
+ vbic q1, q1, q14 ; filter &= ~hev
+
+ vqadd.s8 q13, q5, q1 ; u = clamp(ps1 + filter)
+ vqsub.s8 q12, q8, q1 ; u = clamp(qs1 - filter)
+
+ veor q6, q11, q10 ; *op0 = u^0x80
+ veor q5, q13, q10 ; *op1 = u^0x80
+ veor q8, q12, q10 ; *oq1 = u^0x80
+
+ bx lr
+ ENDP ; |vp9_loop_filter_neon_16|
+
+ END
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