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reload.c (find_reloads_toplev): Use gen_lowpart common to convert between constant representations when... 

* reload.c (find_reloads_toplev): Use gen_lowpart common to convert
        between constant representations when we have (SUBREG (REG)) with
        REG equivalent to a constant.

From-SVN: r20398
This commit is contained in:
Jeffrey A Law 1998-06-10 01:14:54 +00:00 committed by Jeff Law
parent 93ec7bc577
commit 0365438d33
2 changed files with 18 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Wed Jun 10 02:11:55 1998 Jeffrey A Law (law@cygnus.com)
* reload.c (find_reloads_toplev): Use gen_lowpart common to convert
between constant representations when we have (SUBREG (REG)) with
REG equivalent to a constant.
Wed Jun 10 01:39:00 1998 Juha Sarlin <juha@c3l.tyreso.se>
* h8300.c (get_shift_alg): Add special cases for shifts of 8 and 24.

13
gcc/reload.c
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@ -4289,7 +4289,18 @@ find_reloads_toplev (x, opnum, type, ind_levels, is_set_dest)
&& (tem = operand_subword (reg_equiv_constant[regno],
SUBREG_WORD (x), 0,
GET_MODE (SUBREG_REG (x)))) != 0)
return tem;
{
/* TEM is now a word sized constant for the bits from X that
we wanted. However, TEM may be the wrong representation.
Use gen_lowpart_common to convert a CONST_INT into a
CONST_DOUBLE and vice versa as needed according to by the mode
of the SUBREG. */
tem = gen_lowpart_common (GET_MODE (x), tem);
if (!tem)
abort ();
return tem;
}
/* If the SUBREG is wider than a word, the above test will fail.
For example, we might have a SImode SUBREG of a DImode SUBREG_REG