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loop.c (check_dbra_loop): Enable code for reversal of some loops without a known constant loop end.

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* loop.c (check_dbra_loop): Enable code for reversal
	of some loops without a known constant loop end.

From-SVN: r22019
This commit is contained in:
J"orn Rennecke 1998-08-27 08:39:22 +00:00 • committed by Joern Rennecke
parent 8c1bd4f5dc
commit 7a5109b7f3
2 changed files with 9 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Thu Aug 27 16:34:51 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (check_dbra_loop): Enable code for reversal
of some loops without a known constant loop end.
Wed Aug 26 18:38:15 1998 Richard Henderson <rth@cygnus.com>
* haifa-sched.c (last_clock_var): New.

9
gcc/loop.c
View file

@ -6931,7 +6931,6 @@ check_dbra_loop (loop_end, insn_count, loop_start)
initial_value = const0_rtx;
}
#if 0
/* Check if there is a NOTE_INSN_LOOP_VTOP note. If there is,
that means that this is a for or while style loop, with
a loop exit test at the start. Thus, we can assume that
@ -6944,12 +6943,12 @@ check_dbra_loop (loop_end, insn_count, loop_start)
vtop = loop_end;
do
vtop = PREV_INSN (vtop);
while (GET_CODE (vtop) != NOTE);
while (GET_CODE (vtop) != NOTE
|| NOTE_LINE_NUMBER (vtop) > 0
|| NOTE_LINE_NUMBER (vtop) == NOTE_REPEATED_LINE_NUMBER
|| NOTE_LINE_NUMBER (vtop) == NOTE_INSN_DELETED);
if (NOTE_LINE_NUMBER (vtop) != NOTE_INSN_LOOP_VTOP)
vtop = NULL_RTX;
#else
vtop = NULL_RTX;
#endif
/* First check if we can do a vanilla loop reversal. */
if (initial_value == const0_rtx