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re PR rtl-optimization/65321 (ICE on valid code at -O2 and -O3 with -g enabled in decompose, at rtl.h:2007)

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PR rtl-optimization/65321
	* cfgexpand.c (expand_debug_expr): Ensure shift amount isn't wider
	than shift mode.
	* var-tracking.c (use_narrower_mode): Likewise.

	* gcc.dg/pr65321.c: New test.

From-SVN: r221298
This commit is contained in:
Jakub Jelinek 2015-03-10 07:36:50 +01:00 committed by Jakub Jelinek
parent caf2df93de
commit 26d83bccd1
5 changed files with 75 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2015-03-10 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/65321
* cfgexpand.c (expand_debug_expr): Ensure shift amount isn't wider
than shift mode.
* var-tracking.c (use_narrower_mode): Likewise.
2015-03-10 Jan Hubicka <hubicka@ucw.cz>
PR tree-optimization/65355

25
gcc/cfgexpand.c
View File

@ -3921,6 +3921,31 @@ expand_debug_expr (tree exp)
op1 = expand_debug_expr (TREE_OPERAND (exp, 1));
if (!op1)
return NULL_RTX;
switch (TREE_CODE (exp))
{
case LSHIFT_EXPR:
case RSHIFT_EXPR:
case LROTATE_EXPR:
case RROTATE_EXPR:
case WIDEN_LSHIFT_EXPR:
/* Ensure second operand isn't wider than the first one. */
inner_mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1)));
if (SCALAR_INT_MODE_P (inner_mode))
{
machine_mode opmode = mode;
if (VECTOR_MODE_P (mode))
opmode = GET_MODE_INNER (mode);
if (SCALAR_INT_MODE_P (opmode)
&& (GET_MODE_PRECISION (opmode)
< GET_MODE_PRECISION (inner_mode)))
op1 = simplify_gen_subreg (opmode, op1, inner_mode,
subreg_lowpart_offset (opmode,
inner_mode));
}
break;
default:
break;
}
/* Fall through. */
unary:

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2015-03-10 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/65321
* gcc.dg/pr65321.c: New test.
2015-03-10 Jan Hubicka <hubicka@ucw.cz>
PR tree-optimization/65355

31
gcc/testsuite/gcc.dg/pr65321.c Normal file
View File

@ -0,0 +1,31 @@
/* PR rtl-optimization/65321 */
/* { dg-do compile } */
/* { dg-options "-O3 -g" } */
int a, b, c, d, e;
int
foo (void)
{
int h;
char i;
for (; c > 0;)
{
for (d = 0; d < 2; d++)
{
i = 1 << d;
if (i - a)
{
e = b = 0;
for (; c; c--)
d = 127;
}
}
h = ~d;
if (h > c)
for (;;)
;
return 0;
}
return 0;
}

8
gcc/var-tracking.c
View File

@ -1011,7 +1011,13 @@ use_narrower_mode (rtx x, machine_mode mode, machine_mode wmode)
return simplify_gen_binary (GET_CODE (x), mode, op0, op1);
case ASHIFT:
op0 = use_narrower_mode (XEXP (x, 0), mode, wmode);
return simplify_gen_binary (ASHIFT, mode, op0, XEXP (x, 1));
op1 = XEXP (x, 1);
/* Ensure shift amount is not wider than mode. */
if (GET_MODE (op1) == VOIDmode)
op1 = lowpart_subreg (mode, op1, wmode);
else if (GET_MODE_PRECISION (mode) < GET_MODE_PRECISION (GET_MODE (op1)))
op1 = lowpart_subreg (mode, op1, GET_MODE (op1));
return simplify_gen_binary (ASHIFT, mode, op0, op1);
default:
gcc_unreachable ();
}