The tmp[lh] variables were defined as inputs to the
asm rather than outputs, which meant that the compiler
rightly diagnosed uninitialized inputs.

Reported-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 host/include/aarch64/host/atomic128-cas.h.inc | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/host/include/aarch64/host/atomic128-cas.h.inc b/host/include/aarch64/host/atomic128-cas.h.inc
index aec27df182..52e98a0bdd 100644
--- a/host/include/aarch64/host/atomic128-cas.h.inc
+++ b/host/include/aarch64/host/atomic128-cas.h.inc
@@ -67,9 +67,9 @@ static inline Int128 atomic16_fetch_and(Int128 *ptr, Int128 new)
         "stlxp %w[tmp], %[tmpl], %[tmph], %[mem]\n\t"
         "cbnz %w[tmp], 0b"
         : [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
-          [oldl] "=&r"(oldl), [oldh] "=&r"(oldh)
-        : [newl] "r"(newl), [newh] "r"(newh),
-          [tmpl] "r"(tmpl), [tmph] "r"(tmph)
+          [oldl] "=&r"(oldl), [oldh] "=&r"(oldh),
+          [tmpl] "=&r"(tmpl), [tmph] "=&r"(tmph)
+        : [newl] "r"(newl), [newh] "r"(newh)
         : "memory");
 
     return int128_make128(oldl, oldh);
@@ -87,9 +87,9 @@ static inline Int128 atomic16_fetch_or(Int128 *ptr, Int128 new)
         "stlxp %w[tmp], %[tmpl], %[tmph], %[mem]\n\t"
         "cbnz %w[tmp], 0b"
         : [mem] "+m"(*ptr), [tmp] "=&r"(tmp),
-          [oldl] "=&r"(oldl), [oldh] "=&r"(oldh)
-        : [newl] "r"(newl), [newh] "r"(newh),
-          [tmpl] "r"(tmpl), [tmph] "r"(tmph)
+          [oldl] "=&r"(oldl), [oldh] "=&r"(oldh),
+          [tmpl] "=&r"(tmpl), [tmph] "=&r"(tmph)
+        : [newl] "r"(newl), [newh] "r"(newh)
         : "memory");
 
     return int128_make128(oldl, oldh);
-- 
2.43.0

On 3/12/25 17:14, Richard Henderson wrote:
> The tmp[lh] variables were defined as inputs to the
> asm rather than outputs, which meant that the compiler
> rightly diagnosed uninitialized inputs.
> 
> Reported-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   host/include/aarch64/host/atomic128-cas.h.inc | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>