[PATCH] Fix PR tree-optimization/49170

[William J. Schmidt]

Rainer has verified the following patch fixes the problem he observed in
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49170.  OK to commit?


2011-05-27  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

        PR tree-optimization/49170
        * tree-ssa-math-opts.c (execute_cse_sincos):  Add checks for
        sincos or cexp.
        


Index: tree-ssa-math-opts.c
===================================================================
--- tree-ssa-math-opts.c    (revision 174277)
+++ tree-ssa-math-opts.c    (working copy)
@@ -1093,6 +1093,10 @@ execute_cse_sincos (void)
         CASE_FLT_FN (BUILT_IN_COS):
         CASE_FLT_FN (BUILT_IN_SIN):
         CASE_FLT_FN (BUILT_IN_CEXPI):
+          /* Make sure we have either sincos or cexp.  */
+          if (!TARGET_HAS_SINCOS && !TARGET_C99_FUNCTIONS)
+            break;
+
           arg = gimple_call_arg (stmt, 0);
           if (TREE_CODE (arg) == SSA_NAME)
             cfg_changed |= execute_cse_sincos_1 (arg);