e3f850ee05
The current code stores pointers to coefficient tables and loads them to access the tables contents. As these pointers are stored in the code sections, it means we end up with text relocations. eu-findtextrel will thus complain about code not compiled with -fpic/-fPIC. Since the pointers are stored in the code sections, we can actually cheat and let the assembler generate relative addressing when accessing the coefficient tables, and just load their location with adr. Change-Id: Ib74ae2d3f2bab80b29991355f2dbe6955f38f6ae
131 lines
4.0 KiB
NASM
131 lines
4.0 KiB
NASM
;
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; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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EXPORT |vp8_bilinear_predict4x4_neon|
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ARM
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REQUIRE8
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PRESERVE8
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AREA ||.text||, CODE, READONLY, ALIGN=2
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; r0 unsigned char *src_ptr,
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; r1 int src_pixels_per_line,
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; r2 int xoffset,
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; r3 int yoffset,
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; r4 unsigned char *dst_ptr,
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; stack(lr) int dst_pitch
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|vp8_bilinear_predict4x4_neon| PROC
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push {r4, lr}
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adr r12, bifilter4_coeff
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ldr r4, [sp, #8] ;load parameters from stack
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ldr lr, [sp, #12] ;load parameters from stack
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cmp r2, #0 ;skip first_pass filter if xoffset=0
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beq skip_firstpass_filter
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;First pass: output_height lines x output_width columns (5x4)
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vld1.u8 {d2}, [r0], r1 ;load src data
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add r2, r12, r2, lsl #3 ;calculate Hfilter location (2coeffsx4bytes=8bytes)
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vld1.u8 {d3}, [r0], r1
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vld1.u32 {d31}, [r2] ;first_pass filter
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vld1.u8 {d4}, [r0], r1
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vdup.8 d0, d31[0] ;first_pass filter (d0-d1)
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vld1.u8 {d5}, [r0], r1
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vdup.8 d1, d31[4]
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vld1.u8 {d6}, [r0], r1
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vshr.u64 q4, q1, #8 ;construct src_ptr[1]
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vshr.u64 q5, q2, #8
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vshr.u64 d12, d6, #8
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vzip.32 d2, d3 ;put 2-line data in 1 register (src_ptr[0])
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vzip.32 d4, d5
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vzip.32 d8, d9 ;put 2-line data in 1 register (src_ptr[1])
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vzip.32 d10, d11
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vmull.u8 q7, d2, d0 ;(src_ptr[0] * vp8_filter[0])
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vmull.u8 q8, d4, d0
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vmull.u8 q9, d6, d0
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vmlal.u8 q7, d8, d1 ;(src_ptr[1] * vp8_filter[1])
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vmlal.u8 q8, d10, d1
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vmlal.u8 q9, d12, d1
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vqrshrn.u16 d28, q7, #7 ;shift/round/saturate to u8
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vqrshrn.u16 d29, q8, #7
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vqrshrn.u16 d30, q9, #7
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;Second pass: 4x4
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secondpass_filter
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cmp r3, #0 ;skip second_pass filter if yoffset=0
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beq skip_secondpass_filter
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add r3, r12, r3, lsl #3 ;calculate Vfilter location
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vld1.u32 {d31}, [r3] ;load second_pass filter
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vdup.8 d0, d31[0] ;second_pass filter parameters (d0-d5)
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vdup.8 d1, d31[4]
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vmull.u8 q1, d28, d0
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vmull.u8 q2, d29, d0
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vext.8 d26, d28, d29, #4 ;construct src_ptr[pixel_step]
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vext.8 d27, d29, d30, #4
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vmlal.u8 q1, d26, d1
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vmlal.u8 q2, d27, d1
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add r0, r4, lr
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add r1, r0, lr
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add r2, r1, lr
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vqrshrn.u16 d2, q1, #7 ;shift/round/saturate to u8
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vqrshrn.u16 d3, q2, #7
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vst1.32 {d2[0]}, [r4] ;store result
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vst1.32 {d2[1]}, [r0]
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vst1.32 {d3[0]}, [r1]
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vst1.32 {d3[1]}, [r2]
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pop {r4, pc}
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;--------------------
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skip_firstpass_filter
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vld1.32 {d28[0]}, [r0], r1 ;load src data
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vld1.32 {d28[1]}, [r0], r1
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vld1.32 {d29[0]}, [r0], r1
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vld1.32 {d29[1]}, [r0], r1
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vld1.32 {d30[0]}, [r0], r1
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b secondpass_filter
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;---------------------
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skip_secondpass_filter
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vst1.32 {d28[0]}, [r4], lr ;store result
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vst1.32 {d28[1]}, [r4], lr
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vst1.32 {d29[0]}, [r4], lr
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vst1.32 {d29[1]}, [r4], lr
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pop {r4, pc}
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ENDP
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;-----------------
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bifilter4_coeff
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DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112
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END
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