MIPS: use pufirfyNaN for substraction result in slow_op_sub

On MIPS, glibc's slowfp implementation of double substraction yields an impure NaN.
WebPlatformForEmbedded · Nov 6, 2015 · bcb5650 · bcb5650
1 parent 206e3df
commit bcb5650
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/Source/JavaScriptCore/runtime/CommonSlowPaths.cpp b/Source/JavaScriptCore/runtime/CommonSlowPaths.cpp
@@ -386,7 +386,14 @@ SLOW_PATH_DECL(slow_path_sub)
     BEGIN();
     double a = OP_C(2).jsValue().toNumber(exec);
     double b = OP_C(3).jsValue().toNumber(exec);
+
+#if CPU(MIPS) && defined(__GLIBC__)
+    // on MIPS, the GLIBC version of the softfp double substraction sometimes
+    // returns impure NaNs
+    RETURN(jsNumber(purifyNaN(a - b)));
+#else
     RETURN(jsNumber(a - b));
+#endif
 }
 
 SLOW_PATH_DECL(slow_path_div)