On 11/22/22 12:33, Richard Earnshaw wrote:
On 22/11/2022 11:21, Richard Sandiford wrote:
Richard Earnshaw via Gcc-patches <gcc-patches@gcc.gnu.org> writes:
On 22/11/2022 09:01, Christophe Lyon via Gcc-patches wrote:
gcc.target/aarch64/aapcs64/test_dfp_17.c has been failing on
big-endian, because the _Decimal32 on-stack argument is not
padded in the same direction depending on endianness.
This patch fixes the testcase so that it expects the argument
in the right stack location, similarly to what other tests do
in the same directory.
gcc/testsuite/ChangeLog:
PR target/107604 * gcc.target/aarch64/aapcs64/test_dfp_17.c:
Fix for big-endian. ---
gcc/testsuite/gcc.target/aarch64/aapcs64/test_dfp_17.c | 4
++++ 1 file changed, 4 insertions(+)
diff --git
a/gcc/testsuite/gcc.target/aarch64/aapcs64/test_dfp_17.c
b/gcc/testsuite/gcc.target/aarch64/aapcs64/test_dfp_17.c index
22dc462bf7c..3c45f715cf7 100644 ---
a/gcc/testsuite/gcc.target/aarch64/aapcs64/test_dfp_17.c +++
b/gcc/testsuite/gcc.target/aarch64/aapcs64/test_dfp_17.c @@
-32,6 +32,10 @@ struct z b = { 9.0dd, 10.0dd, 11.0dd, 12.0dd
}; ANON(struct z, a, D1) ANON(struct z, b, STACK) ANON(int , 5,
W0) +#ifndef __AAPCS64_BIG_ENDIAN__ ANON(_Decimal32, f1,
STACK+32) /* Note: no promotion to _Decimal64. */ +#else +
ANON(_Decimal32, f1, STACK+36) /* Note: no promotion to
_Decimal64. */ +#endif LAST_ANON(_Decimal64, 0.5dd, STACK+40)
#endif
Why would a Decimal32 change stack placement based on the
endianness? Isn't it a 4-byte object?
Yes, but PARM_BOUNDARY (64) sets a minimum alignment for all stack
arguments.
Richard
Ah, OK.
Indeed, it was not immediately obvious to me either, when looking at
aarch64_layout_arg. aarch64_function_arg_padding comes into play, too.
I wonder if we should have a new macro in the tests, something like
ANON_PADDED to describe this case and that works things out more
automagically for big-endian.
Maybe. There are many other tests under aapcs64/ which have a similar
#ifndef __AAPCS64_BIG_ENDIAN__
I notice the new ANON definition is not correctly indented.
It looks OK on my side (2 spaces).
Thanks,
Christophe
R.
