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| author | Franz Sirl <Franz.Sirl-kernel@lauterbach.com> | 2001-02-25 00:08:01 +0000 |
|---|---|---|
| committer | Franz Sirl <sirl@gcc.gnu.org> | 2001-02-25 00:08:01 +0000 |
| commit | c7b306770070affddc81bcf409e1b1420f49c35d (patch) | |
| tree | c66d79240411c9adfee5a681888a862805dd86ac /gcc | |
| parent | bd015d378330fc78f85d28ed8c094837e23baca8 (diff) | |
| download | gcc-c7b306770070affddc81bcf409e1b1420f49c35d.tar.gz | |
loop.c (check_dbra_loop): A biv has uses besides counting if it is used to set another biv.
2001-02-24 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
* loop.c (check_dbra_loop): A biv has uses besides counting if it is
used to set another biv.
From-SVN: r40042
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/loop.c | 9 |
2 files changed, 14 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 00ce4bd4348..d363794c076 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2001-02-24 Franz Sirl <Franz.Sirl-kernel@lauterbach.com> + + * loop.c (check_dbra_loop): A biv has uses besides counting if it is + used to set another biv. + Sat Feb 24 06:45:21 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu> * tree.h (BLOCK_DEAD): New macro. diff --git a/gcc/loop.c b/gcc/loop.c index 252e27eb087..7eb4d0df450 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -7259,6 +7259,7 @@ check_dbra_loop (loop, insn_count) if (bl->giv_count == 0 && ! loop->exit_count) { rtx bivreg = regno_reg_rtx[bl->regno]; + struct iv_class *blt; /* If there are no givs for this biv, and the only exit is the fall through at the end of the loop, then @@ -7295,6 +7296,14 @@ check_dbra_loop (loop, insn_count) break; } } + + /* A biv has uses besides counting if it is used to set another biv. */ + for (blt = ivs->list; blt; blt = blt->next) + if (blt->init_set && reg_mentioned_p (bivreg, SET_SRC (blt->init_set))) + { + no_use_except_counting = 0; + break; + } } if (no_use_except_counting) |