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A more succinct definition of the LR35902 interrupt mechanism.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon
2017-12-12 22:29:37 +00:00
parent a1c753d63e
commit 697bfb636d
2 changed files with 34 additions and 33 deletions
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inc/EightBitCompilerDefinitions.h
+24 -6
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@@ -1,8 +1,17 @@
#pragma once
#ifdef _MSC_VER
# include <intrin.h>
#endif
#ifdef __GNUG__
# include <x86intrin.h>
#endif
namespace EightBit {
int countBits(uint8_t value);
bool oddParity(uint8_t value);
int findFirstSet(int value);
}
/*
@@ -25,25 +34,34 @@ inline bool EightBit::oddParity(uint8_t value) {
return countBits(value) % 2;
}
inline int EightBit::findFirstSet(int value) {
#ifdef _MSC_VER
unsigned long index;
if (_BitScanForward(&index, value))
return index + 1;
return 0;
#elif defined(__GNUG__)
return __builtin_ffs(value);
#else
# error Find first set not implemented
#endif
}
# include <intrin.h>
#ifdef _MSC_VER
# define LIKELY(x) (x)
# define UNLIKELY(x) (x)
# define EIGHTBIT_PARITY(x) (__popcnt(x) % 2)
# define PARITY(x) (__popcnt(x) % 2)
# define UNREACHABLE __assume(0)
#elif defined(__GNUG__)
# include <x86intrin.h>
# define LIKELY(x) __builtin_expect(!!(x), 1)
# define UNLIKELY(x) __builtin_expect(!!(x), 0)
# define EIGHTBIT_PARITY(x) __builtin_parity(value)
# define PARITY(x) __builtin_parity(value)
# define UNREACHABLE __builtin_unreachable();
@@ -52,7 +70,7 @@ inline bool EightBit::oddParity(uint8_t value) {
# define LIKELY(x) (x)
# define UNLIKELY(x) (x)
# define EIGHTBIT_PARITY(x) EightBit::oddParity(x)
# define PARITY(x) EightBit::oddParity(x)
# define UNREACHABLE