nnn

commit fb5b2e5e649cf1a05813f44b466a613e697404fc
parent c9b384f00904caa7545a366b8e00efeb17486977
Author: NRK <nrk@disroot.org>
Date:   Tue,  3 Jan 2023 02:20:21 +0600

icons-hash: fix bitwise rotation

in case the rotation is 0, `v >> (32 - r)` would end up doing a 32 right
shift which is equal to the width of `v` and thus undefined behavior.

ref: https://blog.regehr.org/archives/1063

Diffstat:
M
src/icons-hash.c
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/icons-hash.c b/src/icons-hash.c
@@ -109,7 +109,7 @@ pcg(uint64_t *state)
 	*state *= GOLDEN_RATIO_64;
 	uint32_t r = (oldstate >> 59);
 	uint32_t v = (oldstate ^ (oldstate >> 18)) >> 27;
-	return (v >> (32 - r)) | (v << r);
+	return (v >> (-r & 31)) | (v << r);
 }
 
 int