2^32-1 or more times unless flag_unsafe_loop_optimizations.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@122262
138bc75d-0d04-0410-961f-
82ee72b054a4
+2007-02-23 Bernd Schmidt <bernd.schmidt@analog.com>
+
+ * config/bfin/bfin.md (doloop_end): Fail for loops that can iterate
+ 2^32-1 or more times unless flag_unsafe_loop_optimizations.
+
2007-02-23 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* builtins.c (fold_builtin_logb, fold_builtin_significand): New.
(unspec [(const_int 0)] UNSPEC_LSETUP_END)
(clobber (match_scratch:SI 5 ""))])]
""
- {bfin_hardware_loop ();})
+{
+ /* Due to limitations in the hardware (an initial loop count of 0
+ does not loop 2^32 times) we must avoid to generate a hardware
+ loops when we cannot rule out this case. */
+
+ if (!flag_unsafe_loop_optimizations
+ && (unsigned HOST_WIDE_INT) INTVAL (operands[2]) >= 0xFFFFFFFF)
+ FAIL;
+ bfin_hardware_loop ();
+})
(define_insn "loop_end"
[(set (pc)