From 7a5109b7f31c875043347be6b894063d1037dd27 Mon Sep 17 00:00:00 2001 From: "J\"orn Rennecke" Date: Thu, 27 Aug 1998 08:39:22 +0000 Subject: [PATCH] loop.c (check_dbra_loop): Enable code for reversal of some loops without a known constant loop end. * loop.c (check_dbra_loop): Enable code for reversal of some loops without a known constant loop end. From-SVN: r22019 --- gcc/ChangeLog | 5 +++++ gcc/loop.c | 9 ++++----- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index aef593f10f1..e4db16f17e0 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Thu Aug 27 16:34:51 1998 J"orn Rennecke + + * 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 * haifa-sched.c (last_clock_var): New. diff --git a/gcc/loop.c b/gcc/loop.c index a34106df26b..f11caebeb81 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -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