[Bug tree-optimization/32684] Missed tail call with sin/cos and sincos pass

[chrbr at gcc dot gnu dot org]

------- Comment #5 from chrbr at gcc dot gnu dot org  2007-10-09 13:12 -------
you are right, it's not a sibcall, my mistake. 
But even at the tree level I still don't see the builtin marked as tailcall. On
a reduced case when entering find_tail_calls I have

D.1177_2 = __builtin_cos (phi_1(D));
D.1176_3 = COMPLEX_EXPR <D.1177_2, 0.0>;
return D.1176_3;

and this is not recognized as a tailcall a candidate because the
GIMPLE_MODIFY_STMT operand 1 is a complex_expr, not a call.

note that in the absence of complex_expr, such as a builtin_memset. all is fine


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32684