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bfin.md (doloop_end): Fail for loops that can iterate 2^32-1 or more times unless... 

* config/bfin/bfin.md (doloop_end): Fail for loops that can iterate
	2^32-1 or more times unless flag_unsafe_loop_optimizations.

From-SVN: r122262
This commit is contained in:
Bernd Schmidt 2007-02-23 15:52:27 +00:00 committed by Bernd Schmidt
parent 94217473a5
commit 0a8f8c4572
2 changed files with 15 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
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.

11
gcc/config/bfin/bfin.md
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@ -1639,7 +1639,16 @@
(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)