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From: "slandden at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/24530] doesn't understand vector double calling conventions
 on ppc64el
Date: Sat, 22 May 2021 05:11:56 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D24530

--- Comment #2 from Shawn Landden <slandden at gmail dot com> ---
debian@big:~$ cat test.c
#include <altivec.h>
#include <stdio.h>

typedef double v2f64 __attribute__((vector_size(16)));

v2f64  __attribute__ ((noinline)) addD(v2f64 one, v2f64 two) {
return one + two;
}

int main() {
v2f64 one =3D {1.5, 2.5};
v2f64 two =3D {3.5, 4.5};
v2f64 res =3D addD(one, two);
printf(" =3D> {%d, %d}\n", res[0], res[1]);
}
debian@big:~$ gcc test.c -g -O3
debian@big:~$ gdb ./a.out=20
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
Reading symbols from ./a.out...
(gdb) break addD
Breakpoint 1 at 0x890: file test.c, line 7.
(gdb) r
Starting program: /home/debian/a.out=20

Breakpoint 1, addD (one=3D..., two=3D...) at test.c:7
7       return one + two;
(gdb) p one
$1 =3D {0, 0}
(gdb) p two
$2 =3D {0, 0}
(gdb) p $vs34
$3 =3D {uint128 =3D 85091360917668755180967208061872635904, v2_double =3D {=
1.5, 2.5},
v4_float =3D {0, 1.9375, 0, 2.0625}, v4_int32 =3D {0, 1073217536, 0,=20
    1074003968}, v8_int16 =3D {0, 0, 0, 16376, 0, 0, 0, 16388}, v16_int8 =
=3D {0, 0,
0, 0, 0, 0, -8, 63, 0, 0, 0, 0, 0, 0, 4, 64}}
(gdb) p $vs35
$4 =3D {uint128 =3D 85164053073688242767772264510015930368, v2_double =3D {=
3.5, 4.5},
v4_float =3D {0, 2.1875, 0, 2.28125}, v4_int32 =3D {0, 1074528256, 0,=20
    1074921472}, v8_int16 =3D {0, 0, 0, 16396, 0, 0, 0, 16402}, v16_int8 =
=3D {0, 0,
0, 0, 0, 0, 12, 64, 0, 0, 0, 0, 0, 0, 18, 64}}
(gdb) finish
Run till exit from #0  addD (one=3D..., two=3D...) at test.c:7
0x00000001000006b0 in main () at test.c:14
14      printf(" =3D> {%d, %d}\n", res[0], res[1]);
Value returned is $5 =3D {5, 7}

--=20
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