Optimization for 'n^2'

Squares are much more common than other exponentiations, and 'n*n' is much more efficient than 'pow'.
lua · Nov 13, 2020 · 9d067ab · 9d067ab
1 parent 2f4162b
commit 9d067ab
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/llimits.h b/llimits.h
@@ -326,7 +326,8 @@ typedef l_uint32 Instruction;
 
 /* exponentiation */
 #if !defined(luai_numpow)
-#define luai_numpow(L,a,b) ((void)L, l_mathop(pow)(a,b))
+#define luai_numpow(L,a,b) \
+ ((void)L, (b == 2) ? (a)*(a) : l_mathop(pow)(a,b))
 #endif
 
 /* the others are quite standard operations */