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Don't use CountDigits for 1-2 digit numbers.

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This commit is contained in:
Victor Zverovich 2014-02-20 21:05:46 -08:00
parent 7abd6443ac
commit 86574285cc
2 changed files with 13 additions and 1 deletions
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2
format-test.cc
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@ -1459,6 +1459,8 @@ TEST(FormatIntTest, FormatDec) {
std::ostringstream os; std::ostringstream os;
os << std::numeric_limits<unsigned short>::max(); os << std::numeric_limits<unsigned short>::max();
EXPECT_EQ(os.str(), FormatDec(std::numeric_limits<unsigned short>::max())); EXPECT_EQ(os.str(), FormatDec(std::numeric_limits<unsigned short>::max()));
EXPECT_EQ("1", FormatDec(1));
EXPECT_EQ("-1", FormatDec(-1));
EXPECT_EQ("42", FormatDec(42)); EXPECT_EQ("42", FormatDec(42));
EXPECT_EQ("-42", FormatDec(-42)); EXPECT_EQ("-42", FormatDec(-42));
EXPECT_EQ("42", FormatDec(42l)); EXPECT_EQ("42", FormatDec(42l));

10
format.h
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@ -1407,6 +1407,16 @@ inline void FormatDec(char *&buffer, T value) {
*buffer++ = '-'; *buffer++ = '-';
abs_value = 0 - abs_value; abs_value = 0 - abs_value;
} }
if (abs_value < 100) {
if (abs_value < 10) {
*buffer++ = static_cast<char>('0' + abs_value);
return;
}
unsigned index = static_cast<unsigned>(abs_value * 2);
*buffer++ = internal::DIGITS[index];
*buffer++ = internal::DIGITS[index + 1];
return;
}
unsigned num_digits = internal::CountDigits(abs_value); unsigned num_digits = internal::CountDigits(abs_value);
internal::FormatDecimal(buffer, abs_value, num_digits); internal::FormatDecimal(buffer, abs_value, num_digits);
buffer += num_digits; buffer += num_digits;