[Qemu-devel] [PATCH 2/3] int128.h: Avoid undefined behaviours involving signed arithmetic

[Peter Maydell <peter.maydell@linaro.org>]

Add casts when we're performing arithmetic on the .hi parts of an
Int128, to avoid undefined behaviour.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/qemu/int128.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/qemu/int128.h b/include/qemu/int128.h
index 9ed47aa..f597031 100644
--- a/include/qemu/int128.h
+++ b/include/qemu/int128.h
@@ -53,7 +53,7 @@ static inline Int128 int128_rshift(Int128 a, int n)
     if (n >= 64) {
         return (Int128) { h, h >> 63 };
     } else {
-        return (Int128) { (a.lo >> n) | (a.hi << (64 - n)), h };
+        return (Int128) { (a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h };
     }
 }
 
@@ -78,7 +78,7 @@ static inline Int128 int128_neg(Int128 a)
 
 static inline Int128 int128_sub(Int128 a, Int128 b)
 {
-    return (Int128){ a.lo - b.lo, a.hi - b.hi - (a.lo < b.lo) };
+    return (Int128){ a.lo - b.lo, (uint64_t)a.hi - b.hi - (a.lo < b.lo) };
 }
 
 static inline bool int128_nonneg(Int128 a)
-- 
1.9.0