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| author | J"orn Rennecke <amylaar@cygnus.co.uk> | 1998-08-27 08:39:22 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 1998-08-27 09:39:22 +0100 |
| commit | 7a5109b7f31c875043347be6b894063d1037dd27 (patch) | |
| tree | 990ed3b17f31c479b0ce1493dc01fbaa19a2fdaa /gcc | |
| parent | 8c1bd4f5dc5d8b43e70d75f5c4ae0ce715c6ebb8 (diff) | |
| download | gcc-7a5109b7f31c875043347be6b894063d1037dd27.zip gcc-7a5109b7f31c875043347be6b894063d1037dd27.tar.gz gcc-7a5109b7f31c875043347be6b894063d1037dd27.tar.bz2 | |
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
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/loop.c | 9 |
2 files changed, 9 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index aef593f..e4db16f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. @@ -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 |