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reload.c (find_reloads_subreg_address): Fail the substitution if the resulting address is insufficiently aligned. 

* reload.c (find_reloads_subreg_address): Fail the substitution
        if the resulting address is insufficiently aligned.

From-SVN: r39250
This commit is contained in:
Richard Henderson 2001-01-24 15:50:56 -08:00 committed by Richard Henderson
parent bf5582ec66
commit 0a28aef93e
2 changed files with 32 additions and 6 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-01-24 Richard Henderson <rth@redhat.com>
* reload.c (find_reloads_subreg_address): Fail the substitution
if the resulting address is insufficiently aligned.
2001-01-24 DJ Delorie <dj@redhat.com>
* combine.c (combine_simplify_rtx): If the modes are all VOIDmode,

33
gcc/reload.c
View File

@ -5648,21 +5648,42 @@ find_reloads_subreg_address (x, force_replace, opnum, type,
|| ! rtx_equal_p (tem, reg_equiv_mem[regno]))
{
int offset = SUBREG_WORD (x) * UNITS_PER_WORD;
unsigned outer_size = GET_MODE_SIZE (GET_MODE (x));
unsigned inner_size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)));
if (BYTES_BIG_ENDIAN)
{
int size;
size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)));
offset += MIN (size, UNITS_PER_WORD);
size = GET_MODE_SIZE (GET_MODE (x));
offset -= MIN (size, UNITS_PER_WORD);
offset += MIN (inner_size, UNITS_PER_WORD);
offset -= MIN (outer_size, UNITS_PER_WORD);
}
XEXP (tem, 0) = plus_constant (XEXP (tem, 0), offset);
PUT_MODE (tem, GET_MODE (x));
/* If this was a paradoxical subreg that we replaced, the
resulting memory must be sufficiently aligned to allow
us to widen the mode of the memory. */
if (outer_size > inner_size && STRICT_ALIGNMENT)
{
rtx base;
base = XEXP (tem, 0);
if (GET_CODE (base) == PLUS)
{
if (GET_CODE (XEXP (base, 1)) == CONST_INT
&& INTVAL (XEXP (base, 1)) % outer_size != 0)
return x;
base = XEXP (base, 0);
}
if (GET_CODE (base) != REG
|| (REGNO_POINTER_ALIGN (REGNO (base))
< outer_size * BITS_PER_UNIT))
return x;
}
find_reloads_address (GET_MODE (tem), &tem, XEXP (tem, 0),
&XEXP (tem, 0), opnum, ADDR_TYPE (type),
ind_levels, insn);
/* If this is not a toplevel operand, find_reloads doesn't see
this substitution. We have to emit a USE of the pseudo so
that delete_output_reload can see it. */