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re PR middle-end/41123 (ICE in expand_expr_real_1)

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PR middle-end/41123
	* expr.c (expand_expr_real_1) <normal_inner_ref>: Handle all kinds
	of CONCAT, not just bitpos 0 bitsize size of the whole CONCAT.

	* gcc.dg/pr41123.c: New test.

From-SVN: r150946
This commit is contained in:
Jakub Jelinek 2009-08-20 00:51:20 +02:00 committed by Jakub Jelinek
parent 0115d4a36f
commit b8e444f438
4 changed files with 84 additions and 10 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2009-08-19 Jakub Jelinek <jakub@redhat.com>
PR middle-end/41123
* expr.c (expand_expr_real_1) <normal_inner_ref>: Handle all kinds
of CONCAT, not just bitpos 0 bitsize size of the whole CONCAT.
2009-08-19 Jason Merrill <jason@redhat.com>
* doc/invoke.texi (C++ Dialect Options): Note change of minimum

37
gcc/expr.c
View File

@ -7871,6 +7871,33 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
|| mode1 == BLKmode
|| bitpos + bitsize > GET_MODE_BITSIZE (mode2));
/* Handle CONCAT first. */
if (GET_CODE (op0) == CONCAT && !must_force_mem)
{
if (bitpos == 0
&& bitsize == GET_MODE_BITSIZE (GET_MODE (op0)))
return op0;
if (bitpos == 0
&& bitsize == GET_MODE_BITSIZE (GET_MODE (XEXP (op0, 0)))
&& bitsize)
{
op0 = XEXP (op0, 0);
mode2 = GET_MODE (op0);
}
else if (bitpos == GET_MODE_BITSIZE (GET_MODE (XEXP (op0, 0)))
&& bitsize == GET_MODE_BITSIZE (GET_MODE (XEXP (op0, 1)))
&& bitpos
&& bitsize)
{
op0 = XEXP (op0, 1);
bitpos = 0;
mode2 = GET_MODE (op0);
}
else
/* Otherwise force into memory. */
must_force_mem = 1;
}
/* If this is a constant, put it in a register if it is a legitimate
constant and we don't need a memory reference. */
if (CONSTANT_P (op0)
@ -7944,16 +7971,6 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
MEM_VOLATILE_P (op0) = 1;
}
/* The following code doesn't handle CONCAT.
Assume only bitpos == 0 can be used for CONCAT, due to
one element arrays having the same mode as its element. */
if (GET_CODE (op0) == CONCAT)
{
gcc_assert (bitpos == 0
&& bitsize == GET_MODE_BITSIZE (GET_MODE (op0)));
return op0;
}
/* In cases where an aligned union has an unaligned object
as a field, we might be extracting a BLKmode value from
an integer-mode (e.g., SImode) object. Handle this case

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2009-08-19 Jakub Jelinek <jakub@redhat.com>
PR middle-end/41123
* gcc.dg/pr41123.c: New test.
2009-08-19 Jason Merrill <jason@redhat.com>
PR c++/41120

46
gcc/testsuite/gcc.dg/pr41123.c Normal file
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@ -0,0 +1,46 @@
/* PR middle-end/41123 */
/* { dg-do compile } */
/* { dg-options "-O2 -fno-strict-aliasing" } */
struct S { char a, b, c, d, e, f, g, h; };
struct T { int a, b; };
struct S
f1 (float _Complex x)
{
return *(struct S *) & x;
}
int
f2 (float _Complex x)
{
struct S f = f1 (x);
return f.b;
}
struct T
f3 (float _Complex x)
{
return *(struct T *) & x;
}
int
f4 (float _Complex x)
{
struct T f = f3 (x);
return f.a;
}
int
f5 (float _Complex x)
{
struct T f = f3 (x);
return f.b;
}
struct T
f6 (float _Complex x)
{
struct T f = f3 (x);
return f;
}