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(push_reload): Add extra reload for inside of SUBREG if 

it is CONSTANT_P.

From-SVN: r11833
This commit is contained in:
Jim Wilson 1996-04-16 18:04:32 -07:00
parent 8b29500078
commit 6fd5ac08f2
1 changed files with 22 additions and 14 deletions
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36
gcc/reload.c
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@ -926,18 +926,23 @@ push_reload (in, out, inloc, outloc, class,
However, we must reload the inner reg *as well as* the subreg in
that case. */
/* Similar issue for (SUBREG constant ...) if it was not handled by the
code above. This can happen if SUBREG_WORD != 0. */
if (in != 0 && GET_CODE (in) == SUBREG
&& GET_CODE (SUBREG_REG (in)) == REG
&& REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
&& (! HARD_REGNO_MODE_OK (REGNO (SUBREG_REG (in)) + SUBREG_WORD (in),
inmode)
|| (GET_MODE_SIZE (inmode) <= UNITS_PER_WORD
&& (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
> UNITS_PER_WORD)
&& ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
/ UNITS_PER_WORD)
!= HARD_REGNO_NREGS (REGNO (SUBREG_REG (in)),
GET_MODE (SUBREG_REG (in)))))))
&& (CONSTANT_P (SUBREG_REG (in))
|| (GET_CODE (SUBREG_REG (in)) == REG
&& REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
&& (! HARD_REGNO_MODE_OK (REGNO (SUBREG_REG (in))
+ SUBREG_WORD (in),
inmode)
|| (GET_MODE_SIZE (inmode) <= UNITS_PER_WORD
&& (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
> UNITS_PER_WORD)
&& ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
/ UNITS_PER_WORD)
!= HARD_REGNO_NREGS (REGNO (SUBREG_REG (in)),
GET_MODE (SUBREG_REG (in)))))))))
{
/* This relies on the fact that emit_reload_insns outputs the
instructions for input reloads of type RELOAD_OTHER in the same
@ -950,7 +955,6 @@ push_reload (in, out, inloc, outloc, class,
dont_remove_subreg = 1;
}
/* Similarly for paradoxical and problematical SUBREGs on the output.
Note that there is no reason we need worry about the previous value
of SUBREG_REG (out); even if wider than out,
@ -1271,9 +1275,13 @@ push_reload (in, out, inloc, outloc, class,
For example, we may now have both IN and OUT
while the old one may have just one of them. */
if (inmode != VOIDmode)
/* The modes can be different. If they are, we want to reload in
the larger mode, so that the value is valid for both modes. */
if (inmode != VOIDmode
&& GET_MODE_SIZE (inmode) > GET_MODE_SIZE (reload_inmode[i]))
reload_inmode[i] = inmode;
if (outmode != VOIDmode)
if (outmode != VOIDmode
&& GET_MODE_SIZE (outmode) > GET_MODE_SIZE (reload_outmode[i]))
reload_outmode[i] = outmode;
if (in != 0)
reload_in[i] = in;