From: notaz <notasas@gmail.com>
Date: Sat, 29 Mar 2025 23:50:22 +0000 (+0200)
Subject: lightrec: Fix count_leading_bits
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fff9a1d4343499d5069bc6f731a9b2959c2a6f53;p=pcsx_rearmed.git

lightrec: Fix count_leading_bits

patching here until upstream reacts
---

diff --git a/deps/lightrec/lightrec.c b/deps/lightrec/lightrec.c
index 5f6a8712..c8e91b71 100644
--- a/deps/lightrec/lightrec.c
+++ b/deps/lightrec/lightrec.c
@@ -567,22 +567,12 @@ static void lightrec_mtc0(struct lightrec_state *state, u8 reg, u32 data)
 
 static u32 count_leading_bits(s32 data)
 {
-	u32 cnt = 33;
-
-#ifdef __has_builtin
-#if __has_builtin(__builtin_clrsb)
+#if defined(__has_builtin) && __has_builtin(__builtin_clrsb)
 	return 1 + __builtin_clrsb(data);
+#else
+	data ^= data >> 31;
+	return data ? clz32(data) : 32;
 #endif
-#endif
-
-	data = (data ^ (data >> 31)) << 1;
-
-	do {
-		cnt -= 1;
-		data >>= 1;
-	} while (data);
-
-	return cnt;
 }
 
 static void lightrec_mtc2(struct lightrec_state *state, u8 reg, u32 data)