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Do it right so that gcc doesn't optimize out the operations.

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This commit is contained in:
Ulrich Drepper 1997-06-04 19:05:17 +00:00
parent c81b73ad0e
commit d981488053
1 changed files with 8 additions and 14 deletions
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22
sysdeps/m68k/fpu/fraiseexcpt.c
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@ -34,9 +34,8 @@ feraiseexcept (int excepts)
if (excepts & FE_INVALID)
{
/* One example of a invalid operation is 0 * Infinity. */
double d = 0.0 * HUGE_VAL;
/* Now force the exception. */
__asm__ __volatile__ ("fnop" : : "f" (d));
double d = HUGE_VAL;
__asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d));
}
/* Next: division by zero. */
@ -49,26 +48,21 @@ feraiseexcept (int excepts)
/* Next: overflow. */
if (excepts & FE_OVERFLOW)
{
long double d = LDBL_MAX * LDBL_MAX;
/* Now force the exception. */
__asm__ __volatile__ ("fnop" : : "f" (d));
long double d = LDBL_MAX;
__asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d));
}
/* Next: underflow. */
if (excepts & FE_UNDERFLOW)
{
long double d = LDBL_MIN / 16.0;
/* Now force the exception. */
__asm__ __volatile__ ("fnop" : : "f" (d));
long double d = LDBL_MIN;
__asm__ __volatile__ ("fdiv%.s %#0r16,%0; fnop" : "=f" (d) : "0" (d));
}
/* Last: inexact. */
if (excepts & FE_INEXACT)
{
long double d1, d2 = 1.0;
__asm__ __volatile__ ("fmovecr %#0,%0\n\t"
"fdiv%.x %1,%0\n\t"
"fnop"
: "=&f" (d1) : "f" (d2));
long double d = 1.0;
__asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d));
}
}