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16743db061
We now maintain an array of booleans that indicate which features were detected at runtime. When code wants to check for a given feature, the array is automatically checked if it has been initialized and if not, a single function checks all features at once. Move all x86 feature detection to pg_cpu_x86.c, and move the CRC function choosing logic to the file where the hardware-specific functions are defined, consistent with more recent hardware-specific files in src/port. Reviewed-by: Zsolt Parragi <zsolt.parragi@percona.com> Discussion: https://postgr.es/m/CANWCAZbgEUFw7LuYSVeJ=Tj98R5HoOB1Ffeqk3aLvbw5rU5NTw@mail.gmail.com
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_cpu.h
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* Runtime CPU feature detection
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*
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* Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/port/pg_cpu.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_CPU_H
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#define PG_CPU_H
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#if defined(USE_SSE2) || defined(__i386__)
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typedef enum X86FeatureId
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{
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/* Have we run feature detection? */
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INIT_PG_X86,
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/* scalar registers and 128-bit XMM registers */
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PG_SSE4_2,
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PG_POPCNT,
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/* 512-bit ZMM registers */
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PG_AVX512_BW,
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PG_AVX512_VL,
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PG_AVX512_VPCLMULQDQ,
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PG_AVX512_VPOPCNTDQ,
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} X86FeatureId;
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#define X86FeaturesSize (PG_AVX512_VPOPCNTDQ + 1)
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extern PGDLLIMPORT bool X86Features[];
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extern void set_x86_features(void);
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static inline bool
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x86_feature_available(X86FeatureId feature)
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{
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if (X86Features[INIT_PG_X86] == false)
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set_x86_features();
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return X86Features[feature];
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}
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#endif /* defined(USE_SSE2) || defined(__i386__) */
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#endif /* PG_CPU_H */
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