[X86][clang] 128bit floating-point operations in x86 machines #77401
Description
testcase:
#include <fenv.h>
#include <stdlib.h>
#include <stdio.h>
int main (void)
{
volatile __float128 a = 0x0.fffp-16382q, b = 0x0.fffp0q, c;
c = a / b;
if (fetestexcept (FE_UNDERFLOW | FE_INEXACT))
printf("Fail1\n");
if (c != 0x1p-16382q)
printf("Fail2\n");
exit (0);
}
compile command:
% clang test.c -o test -lm -m32
% ./test
Fail1
Fail2
compile in x86_64 will return normally, but x86 output Fail.
https://godbolt.org/z/vhdsMhd8d