procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

PR middle-end/18029 and PR middle-end/18030

Browse source 
PR middle-end/18029 and PR middle-end/18030
	* expr.c (optimize_bitfield_assignment_op): Add a special case
	to handle BIT_IOR_EXPR and BIT_XOR_EXPR.

From-SVN: r95782
This commit is contained in:
Kazu Hirata 2005-03-02 16:04:50 +00:00 • committed by Kazu Hirata
parent 613c5cd0c6
commit 92fb2d32d5
2 changed files with 39 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
gcc/ChangeLog
View file

@ -6,6 +6,10 @@
config/rs6000/rs6000-protos.h, doc/contrib.texi,
doc/include/gcc-common.texi: Update copyright.
PR middle-end/18029 and PR middle-end/18030
* expr.c (optimize_bitfield_assignment_op): Add a special case
to handle BIT_IOR_EXPR and BIT_XOR_EXPR.
2005-03-02 Richard Guenther <rguenth@gcc.gnu.org>
* cgraph.h (struct cgraph_edge): Add prev_caller and

35
gcc/expr.c
View file

@ -3755,6 +3755,41 @@ optimize_bitfield_assignment_op (unsigned HOST_WIDE_INT bitsize,
emit_move_insn (str_rtx, result);
return true;
case BIT_IOR_EXPR:
case BIT_XOR_EXPR:
if (TREE_CODE (op1) != INTEGER_CST)
break;
value = expand_expr (op1, NULL_RTX, GET_MODE (str_rtx), 0);
value = convert_modes (GET_MODE (str_rtx),
TYPE_MODE (TREE_TYPE (op1)), value,
TYPE_UNSIGNED (TREE_TYPE (op1)));
/* We may be accessing data outside the field, which means
we can alias adjacent data. */
if (MEM_P (str_rtx))
{
str_rtx = shallow_copy_rtx (str_rtx);
set_mem_alias_set (str_rtx, 0);
set_mem_expr (str_rtx, 0);
}
binop = TREE_CODE (src) == BIT_IOR_EXPR ? ior_optab : xor_optab;
if (bitpos + bitsize != GET_MODE_BITSIZE (GET_MODE (str_rtx)))
{
rtx mask = GEN_INT (((unsigned HOST_WIDE_INT) 1 << bitsize)
- 1);
value = expand_and (GET_MODE (str_rtx), value, mask,
NULL_RTX);
}
value = expand_shift (LSHIFT_EXPR, GET_MODE (str_rtx), value,
build_int_cst (NULL_TREE, bitpos),
NULL_RTX, 1);
result = expand_binop (GET_MODE (str_rtx), binop, str_rtx,
value, str_rtx, 1, OPTAB_WIDEN);
if (result != str_rtx)
emit_move_insn (str_rtx, result);
return true;
default:
break;
}