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985e93f9fa
This also adds the cpuid functionality inline and checks for GCC ASM flag output support. Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3226 Fixes: 3bf6de60b ("cogl: Add CPU capability detection helper") Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3488>
107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2022 Red Hat Inc
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* Copyright 2008 Dennis Smit
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*/
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/* CPU capability discovery code comes from lp_cpu_detect.c in mesa. */
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#include "config.h"
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#include "cogl/cogl-cpu-caps.h"
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#include <stdint.h>
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CoglCpuCaps cogl_cpu_caps;
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#ifdef __x86_64
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static inline uint64_t
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xgetbv (void)
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{
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#ifdef __GCC_ASM_FLAG_OUTPUTS__
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uint32_t eax, edx;
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__asm __volatile (
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".byte 0x0f, 0x01, 0xd0" /* xgetbv isn't supported on gcc < 4.4 */
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: "=a"(eax),
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"=d"(edx)
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: "c"(0)
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);
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return ((uint64_t) edx << 32) | eax;
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#else
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return 0;
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#endif
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}
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static inline void
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cpuid (uint32_t ax,
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uint32_t *p)
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{
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#ifdef __GCC_ASM_FLAG_OUTPUTS__
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__asm __volatile (
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"cpuid\n\t"
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: "=a" (p[0]),
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"=b" (p[1]),
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"=c" (p[2]),
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"=d" (p[3])
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: "0" (ax)
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);
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#else
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p[0] = 0;
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p[1] = 0;
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p[2] = 0;
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p[3] = 0;
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#endif
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}
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#endif
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void
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cogl_init_cpu_caps (void)
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{
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#ifdef __x86_64
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uint32_t regs[4];
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cpuid (0x00000000, regs);
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if (regs[0] >= 0x00000001)
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{
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uint32_t regs2[4];
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gboolean has_avx;
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cpuid (0x00000001, regs2);
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has_avx = (((regs2[2] >> 28) & 1) && /* AVX */
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((regs2[2] >> 27) & 1) && /* OSXSAVE */
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((xgetbv () & 6) == 6)); /* XMM & YMM */
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if (((regs2[2] >> 29) & 1) && has_avx)
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cogl_cpu_caps |= COGL_CPU_CAP_F16C;
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}
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#endif
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}
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