[gcc r13-5528] testsuite/108604 - gcc.dg/torture/pr108574-3.c hangs on unsigned char archs

[Richard Biener <rguenth@gcc.gnu.org>]

https://gcc.gnu.org/g:78d6489f736963a8a07c494294c72662c49e8e63

commit r13-5528-g78d6489f736963a8a07c494294c72662c49e8e63
Author: Xianmiao Qu <cooper.qu@linux.alibaba.com>
Date:   Tue Jan 31 09:49:06 2023 +0100

    testsuite/108604 - gcc.dg/torture/pr108574-3.c hangs on unsigned char archs
    
    In the architecture where sign defaults to unsigned, the 'f' will be zero
    extended to int type in the expression 'd = ~(f & ~2880764155)', then the
    'd' will become -1 wich cause the case to fail.
    So it's ok for the architectures where sign defaults to signed like x86,
    but failed for the architectures where sign defaults to unsigned like arm
    and csky. Change char to signed char to avoid this problem.
    
            PR testsuite/108604
    gcc/testsuite:
            * gcc.dg/torture/pr108574-3.c (b, f): Change type from char to
            signed char.

Diff:
---
 gcc/testsuite/gcc.dg/torture/pr108574-3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.dg/torture/pr108574-3.c b/gcc/testsuite/gcc.dg/torture/pr108574-3.c
index 3c9146e31ac..b4d5dae9f80 100644
--- a/gcc/testsuite/gcc.dg/torture/pr108574-3.c
+++ b/gcc/testsuite/gcc.dg/torture/pr108574-3.c
@@ -1,7 +1,7 @@
 /* { dg-do run } */
 
 int a = 3557301289, d;
-char b, f;
+signed char b, f;
 unsigned short c = 241;
 short e, g;
 static void h() {