From fc0d9a82a5fd90f348fac7cb61dc81081d57f03f Mon Sep 17 00:00:00 2001
From: rose <47357290+rose4096@users.noreply.github.com>
Date: Fri, 25 Mar 2022 19:42:23 -0400
Subject: [PATCH] Fix clang-cl compile with CONFIG_INT128 in qemu

---
 qemu/include/qemu/host-utils.h | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/qemu/include/qemu/host-utils.h b/qemu/include/qemu/host-utils.h
index 2939025f..0c5b30ff 100644
--- a/qemu/include/qemu/host-utils.h
+++ b/qemu/include/qemu/host-utils.h
@@ -49,7 +49,29 @@ static inline void muls64(uint64_t *plow, uint64_t *phigh,
 /* compute with 96 bit intermediate result: (a*b)/c */
 static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
 {
-    return (__int128_t)a * b / c;
+    #if defined(_MSC_VER) && defined(__clang__)
+        union {
+            uint64_t ll;
+            struct {
+    #ifdef HOST_WORDS_BIGENDIAN
+                uint32_t high, low;
+    #else
+                uint32_t low, high;
+    #endif
+            } l;
+        } u, res;
+        uint64_t rl, rh;
+
+        u.ll = a;
+        rl = (uint64_t)u.l.low * (uint64_t)b;
+        rh = (uint64_t)u.l.high * (uint64_t)b;
+        rh += (rl >> 32);
+        res.l.high = rh / c;
+        res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
+        return res.ll;
+    #else
+        return (__int128_t)a * b / c;
+    #endif
 }
 
 static inline int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor)