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(operands_match_p): For WORDS_BIG_ENDIAN machines, 

make multiple register operands equivalent if the last register of
the groups are the same.
(subst_reloads): Use gen_lowpart_common to change mode of
reloadreg.

From-SVN: r3030
This commit is contained in:
Jim Wilson 1992-12-31 14:31:24 -08:00
parent 3002e1601b
commit dca52d8026
1 changed files with 11 additions and 1 deletions
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12
gcc/reload.c
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@ -1592,6 +1592,16 @@ operands_match_p (x, y)
else
j = REGNO (y);
/* On a WORDS_BIG_ENDIAN machine, point to the last register of a
multiple hard register group, so that for example (reg:DI 0) and
(reg:SI 1) will be considered the same register. */
if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
&& i < FIRST_PSEUDO_REGISTER)
i += (GET_MODE_SIZE (GET_MODE (x)) / UNITS_PER_WORD) - 1;
if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (y)) > UNITS_PER_WORD
&& j < FIRST_PSEUDO_REGISTER)
j += (GET_MODE_SIZE (GET_MODE (y)) / UNITS_PER_WORD) - 1;
return i == j;
}
/* If two operands must match, because they are really a single
@ -4348,7 +4358,7 @@ subst_reloads ()
/* Encapsulate RELOADREG so its machine mode matches what
used to be there. */
if (GET_MODE (reloadreg) != r->mode && r->mode != VOIDmode)
reloadreg = gen_rtx (REG, r->mode, REGNO (reloadreg));
reloadreg = gen_lowpart_common (r->mode, reloadreg);
/* If we are putting this into a SUBREG and RELOADREG is a
SUBREG, we would be making nested SUBREGs, so we have to fix