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-rw-r--r--Include/pyport.h12
1 files changed, 8 insertions, 4 deletions
diff --git a/Include/pyport.h b/Include/pyport.h
index 953f75c..81b1bde 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -87,13 +87,17 @@ Used in: Py_SAFE_DOWNCAST
/* If PYLONG_BITS_IN_DIGIT is not defined then we'll use 30-bit digits if all
the necessary integer types are available, and we're on a 64-bit platform
- (as determined by SIZEOF_VOID_P); otherwise we use 15-bit digits. */
+ (as determined by SIZEOF_VOID_P); otherwise we use 15-bit digits.
+
+ From pyodide: WASM has 32 bit pointers but has native 64 bit arithmetic
+ so it is more efficient to use 30 bit digits.
+ */
#ifndef PYLONG_BITS_IN_DIGIT
-#if SIZEOF_VOID_P >= 8
-#define PYLONG_BITS_IN_DIGIT 30
+#if SIZEOF_VOID_P >= 8 || defined(__wasm__)
+# define PYLONG_BITS_IN_DIGIT 30
#else
-#define PYLONG_BITS_IN_DIGIT 15
+# define PYLONG_BITS_IN_DIGIT 15
#endif
#endif