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operator<< on FloatProxy preserves float and fill

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Fixes formatting of disassembler output after printing
a hex float, e.g. for a NaN or subnormal.
This commit is contained in:
David Neto 2016-01-05 12:45:54 -05:00
parent 3664bd5670
commit d0de196439
2 changed files with 22 additions and 0 deletions
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7
include/util/hex_float.h
View File

@ -679,6 +679,9 @@ std::ostream& operator<<(std::ostream& os, const HexFloat<T, Traits>& value) {
--fraction_nibbles;
}
const auto saved_flags = os.flags();
const auto saved_fill = os.fill();
os << sign << "0x" << (is_zero ? '0' : '1');
if (fraction_nibbles) {
// Make sure to keep the leading 0s in place, since this is the fractional
@ -687,6 +690,10 @@ std::ostream& operator<<(std::ostream& os, const HexFloat<T, Traits>& value) {
<< fraction;
}
os << "p" << std::dec << (int_exponent >= 0 ? "+" : "") << int_exponent;
os.flags(saved_flags);
os.fill(saved_fill);
return os;
}

15
test/HexFloat.cpp
View File

@ -248,6 +248,21 @@ INSTANTIATE_TEST_CASE_P(
{uint64_t(0x7FFFFFFFFFFFFFFFLL), "0x1.fffffffffffffp+1024"}, // -nan
})));
TEST(HexFloatStreamTest, OperatorLeftShiftPreservesFloatAndFill) {
std::stringstream s;
s << std::setw(4) << std::oct << std::setfill('x') << 8 << " "
<< FloatProxy<float>(uint32_t(0xFF800100)) << " " << std::setw(4) << 9;
EXPECT_THAT(s.str(), Eq(std::string("xx10 -0x1.0002p+128 xx11")));
}
TEST(HexDoubleStreamTest, OperatorLeftShiftPreservesFloatAndFill) {
std::stringstream s;
s << std::setw(4) << std::oct << std::setfill('x') << 8 << " "
<< FloatProxy<double>(uint64_t(0x7FF0F00000000000LL)) << " " << std::setw(4)
<< 9;
EXPECT_THAT(s.str(), Eq(std::string("xx10 0x1.0fp+1024 xx11")));
}
TEST_P(DecodeHexFloatTest, DecodeCorrectly) {
EXPECT_THAT(Decode<float>(GetParam().first), Eq(GetParam().second));
}