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optimized slice filling in xoshiro/pcg_random_generator_proc (#6001)

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Xotchkass
2026-01-13 22:11:01 +02:00
committed by GitHub
parent 0c3f3f536b
commit edb70a8d75
2 changed files with 26 additions and 18 deletions
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22
core/math/rand/rand_pcg.odin
View File

@@ -55,16 +55,20 @@ pcg_random_generator_proc :: proc(data: rawptr, mode: runtime.Random_Generator_M
intrinsics.unaligned_store((^u64)(raw_data(p)), read_u64(r))
case:
// All other cases.
pos := i8(0)
val := u64(0)
for &v in p {
if pos == 0 {
val = read_u64(r)
pos = 8
n := len(p) / size_of(u64)
buff := ([^]u64)(raw_data(p))[:n]
for &e in buff {
intrinsics.unaligned_store(&e, read_u64(r))
}
// Handle remaining bytes
rem := len(p) % size_of(u64)
if rem > 0 {
val := read_u64(r)
tail := p[len(p) - rem:]
for &b in tail {
b = byte(val)
val >>= 8
}
v = byte(val)
val >>= 8
pos -= 1
}
}

22
core/math/rand/rand_xoshiro256.odin
View File

@@ -74,16 +74,20 @@ xoshiro256_random_generator_proc :: proc(data: rawptr, mode: runtime.Random_Gene
intrinsics.unaligned_store((^u64)(raw_data(p)), read_u64(r))
case:
// All other cases.
pos := i8(0)
val := u64(0)
for &v in p {
if pos == 0 {
val = read_u64(r)
pos = 8
n := len(p) / size_of(u64)
buff := ([^]u64)(raw_data(p))[:n]
for &e in buff {
intrinsics.unaligned_store(&e, read_u64(r))
}
// Handle remaining bytes
rem := len(p) % size_of(u64)
if rem > 0 {
val := read_u64(r)
tail := p[len(p) - rem:]
for &b in tail {
b = byte(val)
val >>= 8
}
v = byte(val)
val >>= 8
pos -= 1
}
}