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expr.c (expand_expr, [...]): Pass constants through immed_double_const to ensure they are properly truncated...

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* expr.c (expand_expr, case PLUS_EXPR): Pass constants through
        immed_double_const to ensure they are properly truncated then
        sign extended.

From-SVN: r28066
This commit is contained in:
Jeffrey A Law 1999-07-12 13:30:40 +00:00 committed by Jeff Law
parent d4a8b6a2f3
commit cbbc503edd
2 changed files with 30 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Mon Jul 12 14:29:15 1999 Jeffrey A Law (law@cygnus.com)
* expr.c (expand_expr, case PLUS_EXPR): Pass constants through
immed_double_const to ensure they are properly truncated then
sign extended.
Mon Jul 12 10:40:01 1999 Vladimir Makarov <vmakarov@tofu.to.cygnus.com>
* config/arm/thumb.c (thumb_reorg): Call replace_symbols_in_block

26
gcc/expr.c
View File

@ -6968,13 +6968,25 @@ expand_expr (exp, target, tmode, modifier)
if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
|| mode == ptr_mode)
{
rtx constant_part;
if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
&& GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
&& TREE_CONSTANT (TREE_OPERAND (exp, 1)))
{
rtx constant_part;
op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode,
EXPAND_SUM);
op1 = plus_constant (op1, TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)));
/* Use immed_double_const to ensure that the constant is
truncated according to the mode of OP1, then sign extended
to a HOST_WIDE_INT. Using the constant directly can result
in non-canonical RTL in a 64x32 cross compile. */
constant_part
= immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)),
(HOST_WIDE_INT) 0,
GET_MODE (op1));
op1 = plus_constant (op1, XINT (constant_part, 0));
if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
op1 = force_operand (op1, target);
return op1;
@ -6984,6 +6996,8 @@ expand_expr (exp, target, tmode, modifier)
&& GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_INT
&& TREE_CONSTANT (TREE_OPERAND (exp, 0)))
{
rtx constant_part;
op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
EXPAND_SUM);
if (! CONSTANT_P (op0))
@ -6996,7 +7010,15 @@ expand_expr (exp, target, tmode, modifier)
goto binop2;
goto both_summands;
}
op0 = plus_constant (op0, TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)));
/* Use immed_double_const to ensure that the constant is
truncated according to the mode of OP1, then sign extended
to a HOST_WIDE_INT. Using the constant directly can result
in non-canonical RTL in a 64x32 cross compile. */
constant_part
= immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)),
(HOST_WIDE_INT) 0,
GET_MODE (op0));
op0 = plus_constant (op0, XINT (constant_part, 0));
if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
op0 = force_operand (op0, target);
return op0;