diff options
| author | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-11-25 18:00:47 +0000 |
|---|---|---|
| committer | jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-11-25 18:00:47 +0000 |
| commit | d7064052b49ccaf6a0e4b416598675f8e8adb682 (patch) | |
| tree | c6ab0e183d73e53aef30128acd6690f703e71220 /gcc/combine.c | |
| parent | 0aebbaada85d9596614626382bbb5e0d725c0fe2 (diff) | |
| download | gcc-d7064052b49ccaf6a0e4b416598675f8e8adb682.tar.gz | |
PR middle-end/46637
* combine.c (try_combine): When substing i2dest for i2src, pass
1 as last argument even if
i0_feeds_i1_n && i1_feeds_i2_n && i0dest_in_i0src.
* gcc.c-torture/compile/pr46637.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@167148 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index c557e8c65c8..a8ce701efb0 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -3096,10 +3096,12 @@ try_combine (rtx i3, rtx i2, rtx i1, rtx i0, int *new_direct_jump_p) /* If I1 feeds into I2 and I1DEST is in I1SRC, we need to make a unique copy of I2SRC each time we substitute it, in order to avoid creating self-referential RTL when we will be substituting I1SRC for I1DEST - later. Likewise if I0 feeds into I2 and I0DEST is in I0SRC. */ + later. Likewise if I0 feeds into I2, either directly or indirectly + through I1, and I0DEST is in I0SRC. */ newpat = subst (PATTERN (i3), i2dest, i2src, 0, (i1_feeds_i2_n && i1dest_in_i1src) - || (i0_feeds_i2_n && i0dest_in_i0src)); + || ((i0_feeds_i2_n || (i0_feeds_i1_n && i1_feeds_i2_n)) + && i0dest_in_i0src)); substed_i2 = 1; /* Record whether I2's body now appears within I3's body. */ |