On Tuesday 03 February 2026 12:11:47 LIU Hao wrote:
> 在 2025-12-26 07:33, Pali Rohár 写道:
> > diff --git a/mingw-w64-crt/testcases/t_sigfpe.c
> > b/mingw-w64-crt/testcases/t_sigfpe.c
> > new file mode 100644
> > index 000000000000..eda858d373f9
> > --- /dev/null
> > +++ b/mingw-w64-crt/testcases/t_sigfpe.c
> > @@ -0,0 +1,31 @@
> > +#include <stdio.h>
> > +#include <setjmp.h>
> > +#include <signal.h>
> > +#include <assert.h>
> > +#include <limits.h>
> > +
> > +static jmp_buf buf;
> > +
> > +static void __attribute__((noreturn)) catch_sigfpe(int signum)
> > +{
> > + printf("SIGFPE exception catched\n");
>
> ^^^ caught
>
> English is nonsense, but meh.
I spotted this after I send email and created local git fixup commit.
>
> > + assert(signum == SIGFPE);
> > + longjmp(buf, 1);
> > +}
> > +
> > +int main(void)
> > +{
> > + signal(SIGFPE, catch_sigfpe);
> > + if (!setjmp(buf))
> > + {
> > + puts("execute: INT_MIN/-1");
> > + volatile int a = INT_MIN;
> > + volatile int b = -1;
> > + volatile int c = a / b;
>
> On ARM, the overflow of signed division is ignored, so this test must be
> skipped for ARM.
>
> (https://developer.arm.com/documentation/ddi0406/c/Application-Level-Architecture/Instruction-Details/Alphabetical-list-of-instructions/SDIV#id19835678)
Ok. I did not know this. In this case it for sure needs to be skipped on ARM
systems.
When I worked with ARM Cortex processors in past, none of them had
support for sdiv and udiv instructions (they were optional) and gcc
replaced division by libgcc function call.
>
>
> diff --git a/mingw-w64-crt/testcases/t_sigfpe.c
> b/mingw-w64-crt/testcases/t_sigfpe.c
> index eda858d37..61e0e2296 100644
> --- a/mingw-w64-crt/testcases/t_sigfpe.c
> +++ b/mingw-w64-crt/testcases/t_sigfpe.c
> @@ -8,13 +8,17 @@ static jmp_buf buf;
>
> static void __attribute__((noreturn)) catch_sigfpe(int signum)
> {
> - printf("SIGFPE exception catched\n");
> + printf("SIGFPE exception caught\n");
> assert(signum == SIGFPE);
> longjmp(buf, 1);
> }
>
> int main(void)
> {
> +#if defined(__arm__) || defined(__aarch64__) || defined(__arm64ec__)
> + puts("Division overflow is ignored on ARM");
> + return 77;
> +#else
> signal(SIGFPE, catch_sigfpe);
> if (!setjmp(buf))
> {
> @@ -28,4 +32,5 @@ int main(void)
> }
> puts("PASSED, program recovered");
> return 0;
> +#endif
> }
That is fine.
_______________________________________________
Mingw-w64-public mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
