[Bug target/33794] [4.3 regression] Wrong code w/ -ffast-math

[ubizjak at gmail dot com]

------- Comment #13 from ubizjak at gmail dot com  2007-10-17 14:31 -------
Proposed patch in testing:

Index: reg-stack.c
===================================================================
--- reg-stack.c (revision 129402)
+++ reg-stack.c (working copy)
@@ -1085,11 +1085,13 @@
         special case with i387 UNSPEC_TAN, where destination is live
         (an argument to fptan) but inherent load of 1.0 is modelled
         as a load from a constant.  */
-      if (! (GET_CODE (pat) == PARALLEL
-            && XVECLEN (pat, 0) == 2
-            && GET_CODE (XVECEXP (pat, 0, 1)) == SET
-            && GET_CODE (SET_SRC (XVECEXP (pat, 0, 1))) == UNSPEC
-            && XINT (SET_SRC (XVECEXP (pat, 0, 1)), 1) == UNSPEC_TAN))
+      if (GET_CODE (pat) == PARALLEL
+         && XVECLEN (pat, 0) == 2
+         && GET_CODE (XVECEXP (pat, 0, 1)) == SET
+         && GET_CODE (SET_SRC (XVECEXP (pat, 0, 1))) == UNSPEC
+         && XINT (SET_SRC (XVECEXP (pat, 0, 1)), 1) == UNSPEC_TAN)
+       emit_swap_insn (insn, regstack, dest);
+      else
        gcc_assert (get_hard_regnum (regstack, dest) < FIRST_STACK_REG);

       gcc_assert (regstack->top < REG_STACK_SIZE);


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33794