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Fixed con_float for non-IEEE machines

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ceriel 1990-12-03 16:00:53 +00:00
parent 4c99b235ed
commit 17af2902eb
1 changed files with 33 additions and 1 deletions
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34
mach/con_float
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@ -131,6 +131,37 @@ float_cst(str, sz, buf)
e.flt_exp = 0; e.flt_exp = 0;
} }
} }
#endif
#ifndef IEEEFLOAT
if (sz == 4 && (e.flt_mantissa.flt_h_32 & 0x80)) {
/* rounding */
if ((e.flt_mantissa.flt_h_32 & 0xffffff00) == 0xffffff00) {
e.flt_exp++;
e.flt_mantissa.flt_h_32 = 0x80000000;
}
else {
e.flt_mantissa.flt_h_32 += 0x80;
}
}
if (sz == 8 && (e.flt_mantissa.flt_l_32 & 0x80)) {
/* rounding */
if ((e.flt_mantissa.flt_l_32 & 0xffffff00) == 0xffffff00) {
e.flt_mantissa.flt_l_32 = 0;
if (e.flt_mantissa.flt_h_32 == 0xffffffff) {
e.flt_exp++;
e.flt_mantissa.flt_h_32 = 0x80000000;
}
else e.flt_mantissa.flt_h_32++;
}
else {
e.flt_mantissa.flt_l_32 += 0x80;
}
}
if (e.flt_exp > 255) {
overflow = 1;
e.flt_exp = 255;
e.flt_mantissa.flt_h_32 = e.flt_mantissa.flt_l_32 = 0xffffffff;
}
#endif #endif
buf[I0] = (e.flt_sign << 7) | (e.flt_exp >> 1); buf[I0] = (e.flt_sign << 7) | (e.flt_exp >> 1);
buf[I1] = ((e.flt_exp&1) << 7) | buf[I1] = ((e.flt_exp&1) << 7) |
@ -157,10 +188,11 @@ float_cst(str, sz, buf)
/* rounding */ /* rounding */
if ((e.flt_mantissa.flt_l_32 & 0xfffff800) == 0xfffff800) { if ((e.flt_mantissa.flt_l_32 & 0xfffff800) == 0xfffff800) {
e.flt_mantissa.flt_l_32 = 0; e.flt_mantissa.flt_l_32 = 0;
if ((e.flt_mantissa.flt_h_32 += 1) == 0) { if (e.flt_mantissa.flt_h_32 == 0xffffffff) {
e.flt_exp++; e.flt_exp++;
e.flt_mantissa.flt_h_32 = 0x80000000; e.flt_mantissa.flt_h_32 = 0x80000000;
} }
else e.flt_mantissa.flt_h_32++;
} }
else { else {
e.flt_mantissa.flt_l_32 += 0x400; e.flt_mantissa.flt_l_32 += 0x400;