bash-3.2$ cat /tmp/x.i
typedef long long __m256i __attribute__ ((__vector_size__ (32),
__may_alias__));
__m256i
bar (__m256i x)
{
return x;
}
bash-3.2$ gcc -S /tmp/x.i
This is due to type_natural_mode doesn't check 32byte types. If I
add
--- ./i386.c.warn 2009-02-11 06:58:52.000000000 -0800
+++ ./i386.c 2009-02-11 18:03:30.000000000 -0800
@@ -4729,7 +4729,7 @@ type_natural_mode (const_tree type)
if (TREE_CODE (type) == VECTOR_TYPE && !VECTOR_MODE_P (mode))
{
HOST_WIDE_INT size = int_size_in_bytes (type);
- if ((size == 8 || size == 16)
+ if ((size == 8 || size == 16 || size == 32)
/* ??? Generic code allows us to create width 1 vectors. Ignore. */
&& TYPE_VECTOR_SUBPARTS (type) > 1)
{
I got
bash-3.2$ ./xgcc -B./ -O2 /tmp/x.i -S
/tmp/x.i: In function bar:
/tmp/x.i:3: warning: AVX vector argument without AVX enabled changes the ABI
/tmp/x.i:6: internal compiler error: in emit_move_multi_word, at expr.c:3317
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
emit_move_multi_word isn't prepared to deal with it.
--
Summary: Gcc doesn't warn __m256 when -mavx isn't used
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hjl dot tools at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39162
