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Implement f16 functionality

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This commit is contained in:
gingerBill
2021-04-01 10:06:00 +01:00
parent a00d7cc705
commit 54e6c50769
16 changed files with 499 additions and 76 deletions
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30
src/common.cpp
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@@ -763,7 +763,7 @@ i64 prev_pow2(i64 n) {
return n - (n >> 1);
}
i16 f32_to_f16(f32 value) {
u16 f32_to_f16(f32 value) {
union { u32 i; f32 f; } v;
i32 i, s, e, m;
@@ -776,20 +776,20 @@ i16 f32_to_f16(f32 value) {
if (e <= 0) {
if (e < -10) return cast(i16)s;
if (e < -10) return cast(u16)s;
m = (m | 0x00800000) >> (1 - e);
if (m & 0x00001000)
m += 0x00002000;
return cast(i16)(s | (m >> 13));
return cast(u16)(s | (m >> 13));
} else if (e == 0xff - (127 - 15)) {
if (m == 0) {
return cast(i16)(s | 0x7c00); /* NOTE(bill): infinity */
return cast(u16)(s | 0x7c00); /* NOTE(bill): infinity */
} else {
/* NOTE(bill): NAN */
m >>= 13;
return cast(i16)(s | 0x7c00 | m | (m == 0));
return cast(u16)(s | 0x7c00 | m | (m == 0));
}
} else {
if (m & 0x00001000) {
@@ -807,13 +807,29 @@ i16 f32_to_f16(f32 value) {
f *= f; /* NOTE(bill): Cause overflow */
}
return cast(i16)(s | 0x7c00);
return cast(u16)(s | 0x7c00);
}
return cast(i16)(s | (e << 10) | (m >> 13));
return cast(u16)(s | (e << 10) | (m >> 13));
}
}
f32 f16_to_f32(u16 value) {
typedef union { u32 u; f32 f; } fp32;
fp32 v;
fp32 magic = {(254u - 15u) << 23};
fp32 inf_or_nan = {(127u + 16u) << 23};
v.u = (value & 0x7fffu) << 13;
v.f *= magic.f;
if (v.f >= inf_or_nan.f) {
v.u |= 255u << 23;
}
v.u |= (value & 0x8000u) << 16;
return v.f;
}
f64 gb_sqrt(f64 x) {
return sqrt(x);
}