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re PR rtl-optimization/45728 (ICE: in gen_lowpart_general, at rtlhooks.c:59 at -O1 when comparing union members)

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PR rtl-optimization/45728
	* expr.c (expand_expr_real_1): If op0 isn't REG or MEM, try
	gen_lowpart_common first and if that fails, force_reg first
	before calling gen_lowpart.

	* gcc.c-torture/compile/pr45728.c: New test.

From-SVN: r164456
This commit is contained in:
Jakub Jelinek 2010-09-20 22:41:08 +02:00 committed by Jakub Jelinek
parent 0a7a6af67e
commit 220c5f0c7f
4 changed files with 36 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,5 +1,10 @@
2010-09-20 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/45728
* expr.c (expand_expr_real_1): If op0 isn't REG or MEM, try
gen_lowpart_common first and if that fails, force_reg first
before calling gen_lowpart.
PR middle-end/45678
* cfgexpand.c (expand_one_stack_var_at): Use
crtl->max_used_stack_slot_alignment as max_align, instead

10
gcc/expr.c
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@ -9381,7 +9381,15 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
{
if (GET_CODE (op0) == SUBREG)
op0 = force_reg (GET_MODE (op0), op0);
op0 = gen_lowpart (mode, op0);
temp = gen_lowpart_common (mode, op0);
if (temp)
op0 = temp;
else
{
if (!REG_P (op0) && !MEM_P (op0))
op0 = force_reg (GET_MODE (op0), op0);
op0 = gen_lowpart (mode, op0);
}
}
/* If both types are integral, convert from one mode to the other. */
else if (INTEGRAL_TYPE_P (type) && INTEGRAL_TYPE_P (TREE_TYPE (treeop0)))

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-09-20 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/45728
* gcc.c-torture/compile/pr45728.c: New test.
2010-09-20 Paul Thomas <pault@gcc.gnu.org>
PR fortran/45081

17
gcc/testsuite/gcc.c-torture/compile/pr45728.c Normal file
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@ -0,0 +1,17 @@
/* PR rtl-optimization/45728 */
union U
{
int *m;
double d;
};
int i;
union U u;
int
foo (void)
{
union U v = { &i };
return u.d == v.d;
}