https://learn.microsoft.com/en-us/cpp/intrinsics/assume?view=msvc-170
Signed-off-by: Antonin Décimo <anto...@tarides.com>
---
Compared to v1, this patch introduces an UNREACHABLE() macro that
expands to builtins for GCC, clang(-cl), and MSVC.
mingw-w64-libraries/winpthreads/src/misc.h | 6 ++++++
mingw-w64-libraries/winpthreads/src/mutex.c | 2 +-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/mingw-w64-libraries/winpthreads/src/misc.h
b/mingw-w64-libraries/winpthreads/src/misc.h
index 83d4b3128..97a65e877 100644
--- a/mingw-w64-libraries/winpthreads/src/misc.h
+++ b/mingw-w64-libraries/winpthreads/src/misc.h
@@ -119,4 +119,10 @@ unsigned long _pthread_wait_for_multiple_objects (unsigned
long count, void **ha
#define unlikely(cond) (cond)
#endif
+#if defined(__GNUC__) || defined(__clang__)
+#define UNREACHABLE() __builtin_unreachable()
+#elif defined(_MSC_VER)
+#define UNREACHABLE() __assume(0)
+#endif
+
#endif
diff --git a/mingw-w64-libraries/winpthreads/src/mutex.c
b/mingw-w64-libraries/winpthreads/src/mutex.c
index fc29341ac..514219821 100644
--- a/mingw-w64-libraries/winpthreads/src/mutex.c
+++ b/mingw-w64-libraries/winpthreads/src/mutex.c
@@ -99,7 +99,7 @@ mutex_impl(pthread_mutex_t *m)
} else {
/* mi cannot be null here; avoid a test in the fast path. */
if (mi == NULL)
- __builtin_unreachable();
+ UNREACHABLE();
return mi;
}
}
--
2.43.0
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