rand.pcg32: make incrementer be always odd in PCG32RNG (#26055)

tankf33der · web-flow · commit 957212d7aa40 · 2025-12-21T01:16:24.000+02:00
diff --git a/vlib/rand/pcg32/pcg32.v b/vlib/rand/pcg32/pcg32.v
@@ -15,7 +15,7 @@ pub struct PCG32RNG {
 	buffer.PRNGBuffer
 mut:
 	state u64 = u64(0x853c49e6748fea9b) ^ seed.time_seed_64()
-	inc   u64 = u64(0xda3e39cb94b95bdb) ^ seed.time_seed_64()
+	inc   u64 = (u64(0xda3e39cb94b95bdb) ^ seed.time_seed_64()) | u64(1)
 }
 
 // seed seeds the PCG32RNG with 4 `u32` values.

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@ pub struct PCG32RNG {`
`15`	`15`	`buffer.PRNGBuffer`
`16`	`16`	`mut:`
`17`	`17`	`state u64 = u64(0x853c49e6748fea9b) ^ seed.time_seed_64()`
`18`		`- inc u64 = u64(0xda3e39cb94b95bdb) ^ seed.time_seed_64()`
	`18`	`+ inc u64 = (u64(0xda3e39cb94b95bdb) ^ seed.time_seed_64()) \| u64(1)`
`19`	`19`	`}`
`20`	`20`
`21`	`21`	// seed seeds the PCG32RNG with 4 `u32` values.