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(push_reload): Fix NULL arg in last change.

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(push_reload): When IN is a subreg of a multiword reg
that uses a funny number of registers, and SUBREG_WORD is nonzero,
and IN must match an output, reload both the reg and the subreg.

From-SVN: r4556
This commit is contained in:
Richard Stallman 1993-05-24 07:51:12 +00:00
parent 8908158db3
commit 86c31b2d15
1 changed files with 32 additions and 3 deletions
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35
gcc/reload.c
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@ -616,9 +616,12 @@ push_reload (in, out, inloc, outloc, class,
really reload just the inside expression in its own mode.
If we have (SUBREG:M1 (REG:M2 ...) ...) with M1 wider than M2 and the
register is a pseudo, this will become the same as the above case.
Do the same for (SUBREG:M1 (REG:M2 ...) ...) for a hard register R where
Similar issue for (SUBREG:M1 (REG:M2 ...) ...) for a hard register R where
either M1 is not valid for R or M2 is wider than a word but we only
need one word to store an M2-sized quantity in R.
(However, if OUT is nonzero, we need to reload the reg *and*
the subreg, so do nothing here, and let following statement handle it.)
Note that the case of (SUBREG (CONST_INT...)...) is handled elsewhere;
we can't handle it here because CONST_INT does not indicate a mode.
@ -635,8 +638,10 @@ push_reload (in, out, inloc, outloc, class,
&& REGNO (SUBREG_REG (in)) >= FIRST_PSEUDO_REGISTER
&& (GET_MODE_SIZE (inmode)
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))))
|| (GET_CODE (SUBREG_REG (in)) == REG
&& REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
|| (REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
/* The case where out is nonzero
is handled differently in the following statement. */
&& (out == 0 || SUBREG_WORD (in) == 0)
&& (! HARD_REGNO_MODE_OK (REGNO (SUBREG_REG (in)), inmode)
|| (GET_MODE_SIZE (inmode) <= UNITS_PER_WORD
&& (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
@ -667,6 +672,30 @@ push_reload (in, out, inloc, outloc, class,
inmode = GET_MODE (in);
}
/* Similar issue for (SUBREG:M1 (REG:M2 ...) ...) for a hard register R where
either M1 is not valid for R or M2 is wider than a word but we only
need one word to store an M2-sized quantity in R.
However, we must reload the inner reg *as well as* the subreg in
that case. */
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)), 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)))))))
{
push_reload (SUBREG_REG (in), NULL_RTX, &SUBREG_REG (in), NULL_PTR,
GENERAL_REGS, VOIDmode, VOIDmode, 0, 0, opnum, type);
}
/* 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,