From fb5b2e5e649cf1a05813f44b466a613e697404fc Mon Sep 17 00:00:00 2001
From: NRK <nrk@disroot.org>
Date: Tue, 3 Jan 2023 02:20:21 +0600
Subject: [PATCH] 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
---
 src/icons-hash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/icons-hash.c b/src/icons-hash.c
index 1b10ae47..da640353 100644
--- 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