diff options
| author | J"orn Rennecke <amylaar@cygnus.co.uk> | 1999-08-02 23:50:36 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 1999-08-03 00:50:36 +0100 |
| commit | a47f48d8fc2ca345f52c851f0ce711d76fcc7a89 (patch) | |
| tree | 28c8e5534186ab6d08dd8af2ed6313c642b40a55 /gcc | |
| parent | f634f682b246632fd128b3dfa0ee9f9d93706842 (diff) | |
| download | gcc-a47f48d8fc2ca345f52c851f0ce711d76fcc7a89.zip gcc-a47f48d8fc2ca345f52c851f0ce711d76fcc7a89.tar.gz gcc-a47f48d8fc2ca345f52c851f0ce711d76fcc7a89.tar.bz2 | |
loop.c (strength_reduce): When doing biv->giv conversion, update reg note of NEXT->insn.
* loop.c (strength_reduce): When doing biv->giv conversion, update
reg note of NEXT->insn.
From-SVN: r28423
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/loop.c | 10 |
2 files changed, 13 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 7ec5204..fe7eec1 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Tue Aug 3 00:45:02 1999 J"orn Rennecke <amylaar@cygnus.co.uk> + + * loop.c (strength_reduce): When doing biv->giv conversion, update + reg note of NEXT->insn. + 1999-08-02 Jakub Jelinek <jj@ultra.linux.cz> * real.c (PUT_REAL): Clear unused bytes if long double is IEEE quad. @@ -4205,7 +4205,7 @@ strength_reduce (scan_start, end, loop_top, insn_count, for (vp = &bl->biv, next = *vp; v = next, next = v->next_iv;) { HOST_WIDE_INT offset; - rtx set, add_val, old_reg, dest_reg, last_use_insn; + rtx set, add_val, old_reg, dest_reg, last_use_insn, note; int old_regno, new_regno; if (! v->always_executed @@ -4311,7 +4311,13 @@ strength_reduce (scan_start, end, loop_top, insn_count, REG_IV_TYPE (new_regno) = GENERAL_INDUCT; REG_IV_INFO (new_regno) = v; - + + /* If next_insn has a REG_EQUAL note that mentiones OLD_REG, + it must be replaced. */ + note = find_reg_note (next->insn, REG_EQUAL, NULL_RTX); + if (note && reg_mentioned_p (old_reg, XEXP (note, 0))) + XEXP (note, 0) = copy_rtx (SET_SRC (single_set (next->insn))); + /* Remove the increment from the list of biv increments, and record it as a giv. */ *vp = next; |