eb75363004
- Eliminate unnecessary "www." - Use HTTPS. - Update Java, MSYS, tdm-gcc, and NSIS URLs. - Update URL and title of Agner Fog's assembly language optimization manual. - Remove extraneous information about MASM and Borland Turbo Assembler and outdated NASM URLs from the x86 assembly headers, and mention Yasm.
87 lines
2.3 KiB
NASM
87 lines
2.3 KiB
NASM
;
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; jsimdcpu.asm - SIMD instruction support check
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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; Copyright (C) 2016, D. R. Commander.
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; Copyright (C) 2023, Aliaksiej Kandracienka.
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;
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; Based on
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; 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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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 64
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;
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; Check if the CPU supports SIMD instructions
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;
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; GLOBAL(unsigned int)
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; jpeg_simd_cpu_support(void)
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;
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align 32
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GLOBAL_FUNCTION(jpeg_simd_cpu_support)
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EXTN(jpeg_simd_cpu_support):
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push rbp
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mov rbp, rsp
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push rbx
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push rdi
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xor rdi, rdi ; simd support flag
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; Assume that all x86-64 processors support SSE & SSE2 instructions
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or rdi, JSIMD_SSE2
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or rdi, JSIMD_SSE
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; Check whether CPUID leaf 07H is supported
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; (leaf 07H is used to check for AVX2 instruction support)
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mov rax, 0
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cpuid
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cmp rax, 7
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jl short .return ; Maximum leaf < 07H
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; Check for AVX2 instruction support
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mov rax, 7
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xor rcx, rcx
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cpuid
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mov rax, rbx ; rax = Extended feature flags
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test rax, 1<<5 ; bit5:AVX2
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jz short .return
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; Check for AVX2 O/S support
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mov rax, 1
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xor rcx, rcx
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cpuid
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test rcx, 1<<27
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jz short .return ; O/S does not support XSAVE
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test rcx, 1<<28
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jz short .return ; CPU does not support AVX2
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xor rcx, rcx
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xgetbv
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and rax, 6
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cmp rax, 6 ; O/S does not manage XMM/YMM state
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; using XSAVE
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jnz short .return
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or rdi, JSIMD_AVX2
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.return:
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mov rax, rdi
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pop rdi
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pop rbx
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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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