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Make some FPU operations more explicit.

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This commit is contained in:
Skyth
2024-09-27 12:37:12 +03:00
parent edbb86913b
commit 8639a690e5
2 changed files with 29 additions and 21 deletions
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16
PowerUtils/ppc_context.h
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@@ -27,8 +27,7 @@
#define PPC_FUNC(x) extern "C" PPC_NOINLINE void x(PPCContext& __restrict__ ctx, uint8_t* base)
#define PPC_FUNC_PROLOGUE() \
__builtin_assume(((size_t)base & 0xFFFFFFFF) == 0); \
#define PPC_FUNC_PROLOGUE() __builtin_assume(((size_t)base & 0xFFFFFFFF) == 0)
#define PPC_LOAD_U8(x) *(uint8_t*)(base + (x))
#define PPC_LOAD_U16(x) __builtin_bswap16(*(uint16_t*)(base + (x)))
@@ -141,20 +140,29 @@ struct alignas(0x10) PPCVRegister
};
};
#define PPC_ROUND_NEAREST 0x00
#define PPC_ROUND_TOWARD_ZERO 0x01
#define PPC_ROUND_UP 0x02
#define PPC_ROUND_DOWN 0x03
#define PPC_ROUND_MASK 0x03
struct PPCFPSCRRegister
{
uint32_t csr;
static constexpr size_t GuestToHost[] = { _MM_ROUND_NEAREST, _MM_ROUND_TOWARD_ZERO, _MM_ROUND_UP, _MM_ROUND_DOWN };
static constexpr size_t HostToGuest[] = { PPC_ROUND_NEAREST, PPC_ROUND_DOWN, PPC_ROUND_UP, PPC_ROUND_TOWARD_ZERO };
inline uint32_t loadFromHost() noexcept
{
csr = _mm_getcsr();
return (0x6C >> ((csr & _MM_ROUND_MASK) >> 12)) & 3;
return HostToGuest[(csr & _MM_ROUND_MASK) >> 13];
}
inline void storeFromGuest(uint32_t value) noexcept
{
csr &= ~_MM_ROUND_MASK;
csr |= ((0x6C >> (2 * (value & 3))) & 3) << 13;
csr |= GuestToHost[value & PPC_ROUND_MASK];
_mm_setcsr(csr);
}