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util: Make atomic_read use volatile reads with _Generic/decltype

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34845>
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Tanner Van De Walle 2025-03-28 13:01:09 -07:00 • committed by Marge Bot
parent 150fa795fe
commit 07ae79d4f9
1 changed files with 21 additions and 1 deletions
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22
src/util/u_atomic.h
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@ -135,8 +135,28 @@ __forceinline short _interlockedadd16(short volatile * _Addend, short _Value)
* Therefore, we rely on implicit casting to LONGLONG for the functions that return
*/
#define p_atomic_set(_v, _i) (*(_v) = (_i))
#define p_atomic_read(_v) (*(_v))
#if defined(__cplusplus)
#include <type_traits>
#define p_atomic_read(_v) (*reinterpret_cast<std::add_volatile_t<decltype(_v)>>(_v))
#else
#define p_atomic_read(_v) (_Generic(*(_v), \
bool : *((volatile bool*) (_v)), \
char : *((volatile char*) (_v)), \
short : *((volatile short*) (_v)), \
int : *((volatile int*) (_v)), \
long : *((volatile long*) (_v)), \
__int64 : *((volatile __int64*) (_v)), \
unsigned char : *((volatile unsigned char*) (_v)), \
unsigned short : *((volatile unsigned short*) (_v)), \
unsigned int : *((volatile unsigned int*) (_v)), \
unsigned long : *((volatile unsigned long*) (_v)), \
unsigned __int64: *((volatile unsigned __int64*)(_v)), \
float : *((volatile float*) (_v)), \
double : *((volatile double*) (_v)), \
default : *(_v)))
#endif
#define p_atomic_read_relaxed(_v) (*(_v))
#define p_atomic_dec_zero(_v) \