pg_cpu.h

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/*-------------------------------------------------------------------------
 *
 * pg_cpu.h
 *    Runtime CPU feature detection
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/port/pg_cpu.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_CPU_H
#define PG_CPU_H
 
#if defined(USE_SSE2) || defined(__i386__)
 
typedef enum X86FeatureId
{
    /* Have we run feature detection? */
    INIT_PG_X86,
 
    /* scalar registers and 128-bit XMM registers */
    PG_SSE4_2,
    PG_POPCNT,
 
    /* 256-bit YMM registers */
    PG_AVX2,
 
    /* 512-bit ZMM registers */
    PG_AVX512_BW,
    PG_AVX512_VL,
    PG_AVX512_VPCLMULQDQ,
    PG_AVX512_VPOPCNTDQ,
 
    /* identification */
    PG_HYPERVISOR,
 
    /* Time-Stamp Counter (TSC) flags */
    PG_RDTSCP,
    PG_TSC_INVARIANT,
    PG_TSC_ADJUST,
} X86FeatureId;
#define X86FeaturesSize (PG_TSC_ADJUST + 1)
 
extern PGDLLIMPORT bool X86Features[];
 
extern void set_x86_features(void);
 
static inline bool
x86_feature_available(X86FeatureId feature)
{
    if (X86Features[INIT_PG_X86] == false)
        set_x86_features();
 
    return X86Features[feature];
}
 
extern uint32 x86_tsc_frequency_khz(void);
 
#endif                          /* defined(USE_SSE2) || defined(__i386__) */
 
#endif                          /* PG_CPU_H */