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diff gcc/builtins.c @ 36:855418dad1a3

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gcc-4.4-20091020
author e075725
date Tue, 22 Dec 2009 21:19:31 +0900
parents 58ad6c70ea60
children 3bfb6c00c1e0
line wrap: on
line diff
--- a/gcc/builtins.c	Thu Sep 24 13:21:57 2009 +0900
+++ b/gcc/builtins.c	Tue Dec 22 21:19:31 2009 +0900
@@ -8634,15 +8634,18 @@
 	    }
 	}
 
-      /* Optimize pow(pow(x,y),z) = pow(x,y*z).  */
+      /* Optimize pow(pow(x,y),z) = pow(x,y*z) iff x is nonnegative.  */
       if (fcode == BUILT_IN_POW
 	  || fcode == BUILT_IN_POWF
 	  || fcode == BUILT_IN_POWL)
 	{
 	  tree arg00 = CALL_EXPR_ARG (arg0, 0);
-	  tree arg01 = CALL_EXPR_ARG (arg0, 1);
-	  tree narg1 = fold_build2 (MULT_EXPR, type, arg01, arg1);
-	  return build_call_expr (fndecl, 2, arg00, narg1);
+	  if (tree_expr_nonnegative_p (arg00))
+	    {
+	      tree arg01 = CALL_EXPR_ARG (arg0, 1);
+	      tree narg1 = fold_build2 (MULT_EXPR, type, arg01, arg1);
+	      return build_call_expr (fndecl, 2, arg00, narg1);
+	    }
 	}
     }