Rev. 1.50, 10/04, page 357 of 448
union {
float f;
int l;
} dstf,srcf;
union {
long d;
int l[2];
} dstd,srcd;
union { /* “long double” format: */
long double x; /* 1-bit sign */
int l[4]; /* 15-bit exponent */
} dstx; /* 112-bit mantissa */
if(FPSCR_PR == 0) {
if(type == FADD) srcf.f = FR[m];
else srcf.f = -FR[m];
dstd.d = FR[n]; /* Conversion from single-precision to double-precision */
dstd.d += srcf.f;
if(((dstd.d == FR[n]) && (srcf.f != 0.0)) ||
((dstd.d == srcf.f) && (FR[n] != 0.0))) {
set_I();
if(sign_of(m)^ sign_of(n)) {
dstd.l[1] -= 1;
if(dstd.l[1] == 0xffffffff) dstd.l[0] -= 1;
}
}
if(dstd.l[1] & 0x1fffffff) set_I();
dstf.f += srcf.f; /* Round to nearest */
if(FPSCR_RM == 1) {
dstd.l[1] &= 0xe0000000; /* Round to zero */
dstf.f = dstd.d;
}
check_single_exception(&FR[n],dstf.f);
} else {
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