--- Comment #8 from hjl dot tools at gmail dot com 2010-02-25 19:25 ---
(In reply to comment #6)
> A blind guess:
>
> Index: i386.c
> ===
> --- i386.c (revision 157069)
> +++ i386.c (working copy)
> @@ -29144,8 +2
--- Comment #7 from ubizjak at gmail dot com 2010-02-25 19:02 ---
(In reply to comment #6)
> H.J., can you please try this patch?
The patch generates this sequence, that looks OK to me:
movl$4, i+16(%rip)
movl$5, i+20(%rip)
movl$6, i+24(%rip)
--- Comment #6 from ubizjak at gmail dot com 2010-02-25 19:01 ---
A blind guess:
Index: i386.c
===
--- i386.c (revision 157069)
+++ i386.c (working copy)
@@ -29144,8 +29144,8 @@ expand_vec_perm_blend (struct expan
--- Comment #5 from hjl dot tools at gmail dot com 2010-02-25 15:30 ---
(In reply to comment #4)
> I think that this code:
>
> i[0].s[0] = 0;
> i[0].s[1] = 1;
> i[0].s[2] = 2;
> i[0].s[3] = 3;
> i[0].s[4] = 4;
> i[0].s[5] = 5;
> i[0].s[6] = 6;
> i[0].s[7] = 7;
>
> is al
--- Comment #4 from ubizjak at gmail dot com 2010-02-25 15:10 ---
I think that this code:
i[0].s[0] = 0;
i[0].s[1] = 1;
i[0].s[2] = 2;
i[0].s[3] = 3;
i[0].s[4] = 4;
i[0].s[5] = 5;
i[0].s[6] = 6;
i[0].s[7] = 7;
is also wrong. You have i[1].s[4].
--
http://gcc.gnu.or
--- Comment #3 from hjl dot tools at gmail dot com 2010-02-25 15:06 ---
We expand
D.3242_4 = __builtin_ia32_vec_perm_v4si (D.3241_3, D.3240_2, { 4, 1, 2, 3 });
into
(insn 27 24 28 3 x.i:22 (set (subreg:V8HI (reg:V4SI 75) 0)
(vec_merge:V8HI (subreg:V8HI (reg:V4SI 75) 0)
--- Comment #2 from hjl dot tools at gmail dot com 2010-02-25 14:55 ---
This code:
0x004004f8 <+84>:vpxor %xmm0,%xmm0,%xmm0
0x004004fc <+88>:vpblendw $0x3,%xmm0,%xmm0,%xmm0
^
0x
--- Comment #1 from hjl dot tools at gmail dot com 2010-02-25 14:53 ---
Starting program: /export/build/gnu/gcc-avx/build-x86_64-linux/prev-gcc/a.out
Breakpoint 1, 0x003b55c33da0 in abort () from /lib64/libc.so.6
(gdb) f 1
#1 0x00400552 in main () at /tmp/x.c:29
29
