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Fix implicit conversion of floats to wide integers.

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This commit is contained in:
Wilson Snyder
2020-03-31 20:42:07 -04:00
parent ebeb645539
commit e6beab4037
8 changed files with 224 additions and 18 deletions
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src/V3Number.cpp
+22 -2
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@@ -2055,8 +2055,28 @@ V3Number& V3Number::opRToIRoundS(const V3Number& lhs) {
NUM_ASSERT_OP_ARGS1(lhs);
NUM_ASSERT_DOUBLE_ARGS1(lhs);
double v = VL_ROUND(lhs.toDouble());
vlsint32_t i = static_cast<vlsint32_t>(v); // C converts from double to vlsint32
return setLongS(i);
setZero();
union { double d; vluint64_t q; } u;
u.d = v; if (u.d) {}
int exp = static_cast<int>((u.q >> VL_ULL(52)) & VL_MASK_Q(11)) - 1023;
int lsb = exp - 52;
vluint64_t mantissa = (u.q & VL_MASK_Q(52)) | (VL_ULL(1) << 52);
if (v != 0) {
// IEEE format: [63]=sign [62:52]=exp+1023 [51:0]=mantissa
// This does not need to support subnormals as they are sub-integral
for (int bit = 0; bit <= 52; ++bit) {
if (mantissa & (VL_ULL(1) << bit)) {
int outbit = bit + lsb;
if (outbit >= 0) setBit(outbit, 1);
}
}
if (v < 0) {
V3Number noSign = *this;
opNegate(noSign);
}
}
return *this;
}
V3Number& V3Number::opRealToBits(const V3Number& lhs) {
NUM_ASSERT_OP_ARGS1(lhs);