https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99234
--- Comment #15 from Liu Hao <lh_mouse at 126 dot com> ---
Thanks. The 'Final fix' looks good to me.
I applied it locally and built GCC. With a debugger, I verified that after the
try-catch statement, all non-volatile XMM registers (6-15) had been restored
properly.
```
// x86_64-w64-mingw32-g++ -O2 -fno-omit-frame-pointer test.cc
__attribute__((__noinline__)) void clobber_xmm6()
{
__asm__ volatile ("xorpd %%xmm6, %%xmm6" ::: "xmm6");
throw 42; // remove this to get expected result
}
int main()
{
static const double xmm5 = 5.123456;
static const double xmm6 = 6.123456;
static const double xmm7 = 7.123456;
static const double xmm8 = 8.123456;
static const double xmm9 = 9.123456;
static const double xmm10 = 10.123456;
static const double xmm11 = 11.123456;
static const double xmm12 = 12.123456;
static const double xmm13 = 13.123456;
static const double xmm14 = 14.123456;
static const double xmm15 = 15.123456;
__asm__ volatile ("movsd %0, %%xmm5 " :: "m"(xmm5 ));
__asm__ volatile ("movsd %0, %%xmm6 " :: "m"(xmm6 ));
__asm__ volatile ("movsd %0, %%xmm7 " :: "m"(xmm7 ));
__asm__ volatile ("movsd %0, %%xmm8 " :: "m"(xmm8 ));
__asm__ volatile ("movsd %0, %%xmm9 " :: "m"(xmm9 ));
__asm__ volatile ("movsd %0, %%xmm10" :: "m"(xmm10));
__asm__ volatile ("movsd %0, %%xmm11" :: "m"(xmm11));
__asm__ volatile ("movsd %0, %%xmm12" :: "m"(xmm12));
__asm__ volatile ("movsd %0, %%xmm13" :: "m"(xmm13));
__asm__ volatile ("movsd %0, %%xmm14" :: "m"(xmm14));
__asm__ volatile ("movsd %0, %%xmm15" :: "m"(xmm15));
try {
clobber_xmm6();
}
catch(...) { }
double value;
__asm__ volatile ("movsd %%xmm6, %0" : "=x"(value));
__builtin_printf("value = %g\n", value); // expect `123.456`
}
```
