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Add 128-bit random procedures to package math/rand

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This commit is contained in:
gingerBill
2019-11-10 18:47:16 +00:00
parent 2ef7bfc06e
commit 098684a6fe
1 changed files with 24 additions and 2 deletions
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core/math/rand/rand.odin
+24 -2
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@@ -47,8 +47,17 @@ uint64 :: proc(r: ^Rand = global_rand_ptr) -> u64 {
return (a<<32) | b; return (a<<32) | b;
} }
int31 :: proc(r: ^Rand = global_rand_ptr) -> i32 { return i32(uint32(r) << 1 >> 1); } uint128 :: proc(r: ^Rand = global_rand_ptr) -> u128 {
int63 :: proc(r: ^Rand = global_rand_ptr) -> i64 { return i64(uint64(r) << 1 >> 1); } a := u128(_random(r));
b := u128(_random(r));
c := u128(_random(r));
d := u128(_random(r));
return (a<<96) | (b<<64) | (c<<32) | d;
}
int31 :: proc(r: ^Rand = global_rand_ptr) -> i32 { return i32(uint32(r) << 1 >> 1); }
int63 :: proc(r: ^Rand = global_rand_ptr) -> i64 { return i64(uint64(r) << 1 >> 1); }
int127 :: proc(r: ^Rand = global_rand_ptr) -> i128 { return i128(uint128(r) << 1 >> 1); }
int31_max :: proc(n: i32, r: ^Rand = global_rand_ptr) -> i32 { int31_max :: proc(n: i32, r: ^Rand = global_rand_ptr) -> i32 {
if n <= 0 do panic("Invalid argument to int31_max"); if n <= 0 do panic("Invalid argument to int31_max");
@@ -76,6 +85,19 @@ int63_max :: proc(n: i64, r: ^Rand = global_rand_ptr) -> i64 {
return v % n; return v % n;
} }
int127_max :: proc(n: i128, r: ^Rand = global_rand_ptr) -> i128 {
if n <= 0 do panic("Invalid argument to int63_max");
if n&(n-1) == 0 {
return int127(r) & (n-1);
}
max := i128((1<<63) - 1 - (1<<63)&u128(n));
v := int127(r);
for v > max {
v = int127(r);
}
return v % n;
}
int_max :: proc(n: int, r: ^Rand = global_rand_ptr) -> int { int_max :: proc(n: int, r: ^Rand = global_rand_ptr) -> int {
if n <= 0 do panic("Invalid argument to int_max"); if n <= 0 do panic("Invalid argument to int_max");
when size_of(int) == 4 { when size_of(int) == 4 {