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For real this time...

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PR middle-end/18008
        * c-decl.c (finish_struct): Set DECL_MODE after resetting a
        field's type.
        * expr.c (store_field): Strip conversions to odd-bit-sized types
        if the destination field width matches.

From-SVN: r94294
This commit is contained in:
Richard Henderson 2005-01-26 16:07:41 -08:00 • committed by Richard Henderson
parent eec6bb06c6
commit 48cc8d3b41
3 changed files with 28 additions and 3 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2005-01-26 Richard Henderson <rth@redhat.com>
PR middle-end/18008
* c-decl.c (finish_struct): Set DECL_MODE after resetting a
field's type.
* expr.c (store_field): Strip conversions to odd-bit-sized types
if the destination field width matches.
2005-01-26 Richard Henderson <rth@redhat.com>
* c-decl.c, expmed.c, expr.c: Revert last change.

7
gcc/c-decl.c
View file

@ -5301,8 +5301,11 @@ finish_struct (tree t, tree fieldlist, tree attributes)
= tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
tree type = TREE_TYPE (*fieldlistp);
if (width != TYPE_PRECISION (type))
TREE_TYPE (*fieldlistp)
= build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
{
TREE_TYPE (*fieldlistp)
= build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
}
DECL_INITIAL (*fieldlistp) = 0;
}
else

16
gcc/expr.c
View file

@ -5215,7 +5215,21 @@ store_field (rtx target, HOST_WIDE_INT bitsize, HOST_WIDE_INT bitpos,
&& TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
&& compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)), bitsize) != 0))
{
rtx temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
rtx temp;
/* If EXP is a NOP_EXPR of precision less than its mode, then that
implies a mask operation. If the precision is the same size as
the field we're storing into, that mask is redundant. This is
particularly common with bit field assignments generated by the
C front end. */
if (TREE_CODE (exp) == NOP_EXPR
&& INTEGRAL_TYPE_P (TREE_TYPE (exp))
&& (TYPE_PRECISION (TREE_TYPE (exp))
< GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (exp))))
&& bitsize == TYPE_PRECISION (TREE_TYPE (exp)))
exp = TREE_OPERAND (exp, 0);
temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
/* If BITSIZE is narrower than the size of the type of EXP
we will be narrowing TEMP. Normally, what's wanted are the