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Re-apply an earlier fix, with a small update 

From-SVN: r37794
This commit is contained in:
Bernd Schmidt 2000-11-27 14:42:54 +00:00 committed by Bernd Schmidt
parent 76e57b4589
commit 7dbe6ae9b3
2 changed files with 25 additions and 14 deletions
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5
gcc/ChangeLog
View File

@ -12,6 +12,11 @@
htab_find_slot_with_hash.
(cselib_lookup): Likewise.
Based on a patch from Geoff Keating <geoffk@redhat.com>:
* loop.c (basic_induction_var): If a REG is set from something
that is not a biv, then the REG is not a biv. Even if it is
earlier set from something that is a biv.
2000-11-27 Alexandre Oliva <aoliva@redhat.com>
* configure.in (extra_objs): Enclose extra_headers in quotes.

34
gcc/loop.c
View File

@ -5467,6 +5467,7 @@ basic_induction_var (loop, x, mode, dest_reg, p, inc_val, mult_val, location)
insn = p;
while (1)
{
rtx dest;
do
{
insn = PREV_INSN (insn);
@ -5479,21 +5480,26 @@ basic_induction_var (loop, x, mode, dest_reg, p, inc_val, mult_val, location)
set = single_set (insn);
if (set == 0)
break;
dest = SET_DEST (set);
if (dest == x
|| (GET_CODE (dest) == SUBREG
&& (GET_MODE_SIZE (GET_MODE (dest)) <= UNITS_PER_WORD)
&& (GET_MODE_CLASS (GET_MODE (dest)) == MODE_INT)
&& SUBREG_REG (dest) == x))
return basic_induction_var (loop, SET_SRC (set),
(GET_MODE (SET_SRC (set)) == VOIDmode
? GET_MODE (x)
: GET_MODE (SET_SRC (set))),
dest_reg, insn,
inc_val, mult_val, location);
if ((SET_DEST (set) == x
|| (GET_CODE (SET_DEST (set)) == SUBREG
&& (GET_MODE_SIZE (GET_MODE (SET_DEST (set)))
<= UNITS_PER_WORD)
&& (GET_MODE_CLASS (GET_MODE (SET_DEST (set)))
== MODE_INT)
&& SUBREG_REG (SET_DEST (set)) == x))
&& basic_induction_var (loop, SET_SRC (set),
(GET_MODE (SET_SRC (set)) == VOIDmode
? GET_MODE (x)
: GET_MODE (SET_SRC (set))),
dest_reg, insn,
inc_val, mult_val, location))
return 1;
while (GET_CODE (dest) == SIGN_EXTRACT
|| GET_CODE (dest) == ZERO_EXTRACT
|| GET_CODE (dest) == SUBREG
|| GET_CODE (dest) == STRICT_LOW_PART)
dest = XEXP (dest, 0);
if (dest == x)
break;
}
/* Fall through. */