188 lines
6.5 KiB
NASM
188 lines
6.5 KiB
NASM
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; Sample data conversion and quantization (64-bit SSE2)
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;
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; Copyright 2009 Pierre Ossman <[email protected]> for Cendio AB
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; Copyright (C) 2009, 2016, 2024-2025, D. R. Commander.
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; Copyright (C) 2018, Matthias Räncker.
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;
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; Based on the x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; This file should be assembled with NASM (Netwide Assembler) or Yasm.
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%include "jsimdext.inc"
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%include "jdct.inc"
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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 64
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; Load data into workspace, applying unsigned->signed conversion
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;
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; GLOBAL(void)
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; jsimd_convsamp_sse2(JSAMPARRAY sample_data, JDIMENSION start_col,
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; DCTELEM *workspace)
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;
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; r10 = JSAMPARRAY sample_data
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; r11d = JDIMENSION start_col
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; r12 = DCTELEM *workspace
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align 32
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GLOBAL_FUNCTION(jsimd_convsamp_sse2)
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EXTN(jsimd_convsamp_sse2):
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ENDBR64
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push rbp
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mov rbp, rsp
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COLLECT_ARGS 3
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push rbx
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pxor xmm6, xmm6 ; xmm6 = (all 0's)
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pcmpeqw xmm7, xmm7
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psllw xmm7, 7 ; xmm7 = { 0xFF80 0xFF80 0xFF80 0xFF80 .. }
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mov rsi, r10
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mov eax, r11d
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mov rdi, r12
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mov rcx, DCTSIZE / 4
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.convloop:
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mov rbxp, JSAMPROW [rsi + 0 * SIZEOF_JSAMPROW] ; (JSAMPLE *)
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mov rdxp, JSAMPROW [rsi + 1 * SIZEOF_JSAMPROW] ; (JSAMPLE *)
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movq xmm0, XMM_MMWORD [rbx + rax * SIZEOF_JSAMPLE]
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; xmm0 = (01234567)
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movq xmm1, XMM_MMWORD [rdx + rax * SIZEOF_JSAMPLE]
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; xmm1 = (89abcdef)
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mov rbxp, JSAMPROW [rsi + 2 * SIZEOF_JSAMPROW] ; (JSAMPLE *)
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mov rdxp, JSAMPROW [rsi + 3 * SIZEOF_JSAMPROW] ; (JSAMPLE *)
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movq xmm2, XMM_MMWORD [rbx + rax * SIZEOF_JSAMPLE]
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; xmm2 = (ghijklmn)
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movq xmm3, XMM_MMWORD [rdx + rax * SIZEOF_JSAMPLE]
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; xmm3 = (opqrstuv)
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punpcklbw xmm0, xmm6 ; xmm0 = (01234567)
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punpcklbw xmm1, xmm6 ; xmm1 = (89abcdef)
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paddw xmm0, xmm7
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paddw xmm1, xmm7
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punpcklbw xmm2, xmm6 ; xmm2 = (ghijklmn)
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punpcklbw xmm3, xmm6 ; xmm3 = (opqrstuv)
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paddw xmm2, xmm7
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paddw xmm3, xmm7
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movdqa XMMWORD [XMMBLOCK(0, 0, rdi, SIZEOF_DCTELEM)], xmm0
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movdqa XMMWORD [XMMBLOCK(1, 0, rdi, SIZEOF_DCTELEM)], xmm1
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movdqa XMMWORD [XMMBLOCK(2, 0, rdi, SIZEOF_DCTELEM)], xmm2
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movdqa XMMWORD [XMMBLOCK(3, 0, rdi, SIZEOF_DCTELEM)], xmm3
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add rsi, byte 4 * SIZEOF_JSAMPROW
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add rdi, byte 4 * DCTSIZE * SIZEOF_DCTELEM
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dec rcx
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jnz short .convloop
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pop rbx
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UNCOLLECT_ARGS 3
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pop rbp
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ret
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; --------------------------------------------------------------------------
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;
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; Quantize/descale the coefficients, and store into coef_block
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;
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; This implementation is based on an algorithm described in
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; "Optimizing subroutines in assembly language:
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; An optimization guide for x86 platforms" (https://agner.org/optimize).
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;
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; GLOBAL(void)
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; jsimd_quantize_sse2(JCOEFPTR coef_block, DCTELEM *divisors,
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; DCTELEM *workspace)
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%define RECIPROCAL(m, n, b) \
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XMMBLOCK(DCTSIZE * 0 + (m), (n), (b), SIZEOF_DCTELEM)
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%define CORRECTION(m, n, b) \
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XMMBLOCK(DCTSIZE * 1 + (m), (n), (b), SIZEOF_DCTELEM)
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%define SCALE(m, n, b) \
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XMMBLOCK(DCTSIZE * 2 + (m), (n), (b), SIZEOF_DCTELEM)
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; r10 = JCOEFPTR coef_block
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; r11 = DCTELEM *divisors
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; r12 = DCTELEM *workspace
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align 32
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GLOBAL_FUNCTION(jsimd_quantize_sse2)
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EXTN(jsimd_quantize_sse2):
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ENDBR64
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push rbp
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mov rbp, rsp
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COLLECT_ARGS 3
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mov rsi, r12
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mov rdx, r11
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mov rdi, r10
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mov rax, DCTSIZE2 / 32
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.quantloop:
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movdqa xmm4, XMMWORD [XMMBLOCK(0, 0, rsi, SIZEOF_DCTELEM)]
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movdqa xmm5, XMMWORD [XMMBLOCK(1, 0, rsi, SIZEOF_DCTELEM)]
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movdqa xmm6, XMMWORD [XMMBLOCK(2, 0, rsi, SIZEOF_DCTELEM)]
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movdqa xmm7, XMMWORD [XMMBLOCK(3, 0, rsi, SIZEOF_DCTELEM)]
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movdqa xmm0, xmm4
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movdqa xmm1, xmm5
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movdqa xmm2, xmm6
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movdqa xmm3, xmm7
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psraw xmm4, (WORD_BIT - 1)
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psraw xmm5, (WORD_BIT - 1)
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psraw xmm6, (WORD_BIT - 1)
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psraw xmm7, (WORD_BIT - 1)
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pxor xmm0, xmm4
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pxor xmm1, xmm5
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pxor xmm2, xmm6
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pxor xmm3, xmm7
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psubw xmm0, xmm4 ; if (xmm0 < 0) xmm0 = -xmm0;
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psubw xmm1, xmm5 ; if (xmm1 < 0) xmm1 = -xmm1;
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psubw xmm2, xmm6 ; if (xmm2 < 0) xmm2 = -xmm2;
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psubw xmm3, xmm7 ; if (xmm3 < 0) xmm3 = -xmm3;
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paddw xmm0, XMMWORD [CORRECTION(0, 0, rdx)]
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; correction + roundfactor
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paddw xmm1, XMMWORD [CORRECTION(1, 0, rdx)]
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paddw xmm2, XMMWORD [CORRECTION(2, 0, rdx)]
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paddw xmm3, XMMWORD [CORRECTION(3, 0, rdx)]
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pmulhuw xmm0, XMMWORD [RECIPROCAL(0, 0, rdx)] ; reciprocal
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pmulhuw xmm1, XMMWORD [RECIPROCAL(1, 0, rdx)]
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pmulhuw xmm2, XMMWORD [RECIPROCAL(2, 0, rdx)]
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pmulhuw xmm3, XMMWORD [RECIPROCAL(3, 0, rdx)]
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pmulhuw xmm0, XMMWORD [SCALE(0, 0, rdx)] ; scale
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pmulhuw xmm1, XMMWORD [SCALE(1, 0, rdx)]
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pmulhuw xmm2, XMMWORD [SCALE(2, 0, rdx)]
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pmulhuw xmm3, XMMWORD [SCALE(3, 0, rdx)]
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pxor xmm0, xmm4
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pxor xmm1, xmm5
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pxor xmm2, xmm6
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pxor xmm3, xmm7
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psubw xmm0, xmm4
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psubw xmm1, xmm5
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psubw xmm2, xmm6
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psubw xmm3, xmm7
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movdqa XMMWORD [XMMBLOCK(0, 0, rdi, SIZEOF_DCTELEM)], xmm0
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movdqa XMMWORD [XMMBLOCK(1, 0, rdi, SIZEOF_DCTELEM)], xmm1
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movdqa XMMWORD [XMMBLOCK(2, 0, rdi, SIZEOF_DCTELEM)], xmm2
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movdqa XMMWORD [XMMBLOCK(3, 0, rdi, SIZEOF_DCTELEM)], xmm3
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add rsi, byte 32 * SIZEOF_DCTELEM
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add rdx, byte 32 * SIZEOF_DCTELEM
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add rdi, byte 32 * SIZEOF_JCOEF
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dec rax
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jnz near .quantloop
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UNCOLLECT_ARGS 3
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pop rbp
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ret
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; For some reason, the OS X linker does not honor the request to align the
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; segment unless we do this.
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align 32
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