67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file bgp/vm_gccdef.h
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*
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* `#define`s for GNUC optimized BGP VM execution loop.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*
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* \note This file should be `#include`d by `bgp/vm.c`
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*/
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#ifdef DF_BGP_VMDEF_H_
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#error "Only one vm_<impl>def.h file may be #include-d"
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#endif
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#define DF_BGP_VMDEF_H_
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#define _CONCAT(x, y) x ## y
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#define _XCONCAT(x, y) _CONCAT(x, y)
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#ifdef __clang__
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// No __attribute__ on labels in CLANG
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#define LIKELY
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#else
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#define LIKELY \
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_XCONCAT(_BRANCH_PREDICT_HINT, __COUNTER__): \
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__attribute__((__hot__, __unused__))
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#endif
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#ifdef __clang__
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// No __attribute__ on labels in CLANG
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#define UNLIKELY
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#else
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#define UNLIKELY \
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_XCONCAT(_BRANCH_PREDICT_HINT, __COUNTER__): \
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__attribute__((__cold__, __unused__))
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#endif
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#define FETCH(ir, vm) (ir = (vm)->prog[(vm)->pc++])
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#define EXPECT(opcode, ir, vm) \
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do { \
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if (__builtin_expect( \
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BGP_VMOPC((vm)->prog[(vm)->pc]) == BGP_VMOP_ ## opcode, \
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1 \
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)) { \
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ir = (vm)->prog[(vm)->pc++]; \
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goto EX_ ## opcode; \
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} \
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} while (0)
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#define DISPATCH(opcode) \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Wpedantic\"") \
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goto *bgp_vmOpTab[opcode]; \
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_Pragma("GCC diagnostic pop") \
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switch (opcode) // This keeps consistency with regular vm_cdef.h
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#define EXECUTE(opcode) case BGP_VMOP_ ## opcode: EX_ ## opcode
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#define EXECUTE_SIGILL default: EX_SIGILL
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