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Improve perf of TryGetAsciiString

This commit is contained in:
moozzyk 2016-06-01 16:17:56 -07:00
parent 9667907515
commit 6e46d9757d
1 changed files with 41 additions and 42 deletions
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83
src/Microsoft.AspNetCore.Server.Kestrel/Infrastructure/AsciiUtilities.cs
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@ -8,73 +8,72 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Infrastructure
public static unsafe bool TryGetAsciiString(byte* input, char* output, int count)
{
var i = 0;
int orValue = 0;
bool hasZero = false;
sbyte* signedInput = (sbyte*)input;
bool isValid = true;
while (i < count - 11)
{
orValue |= *input | *(input + 1) | *(input + 2) | *(input + 3) | *(input + 4) | *(input + 5) |
*(input + 6) | *(input + 7) | *(input + 8) | *(input + 9) | *(input + 10) | *(input + 11);
hasZero = hasZero || *input == 0 || *(input + 1) == 0 || *(input + 2) == 0 || *(input + 3) == 0 ||
*(input + 4) == 0 || *(input + 5) == 0 || *(input + 6) == 0 || *(input + 7) == 0 ||
*(input + 8) == 0 || *(input + 9) == 0 || *(input + 10) == 0 || *(input + 11) == 0;
isValid = isValid && *signedInput > 0 && *(signedInput + 1) > 0 && *(signedInput + 2) > 0 &&
*(signedInput + 3) > 0 && *(signedInput + 4) > 0 && *(signedInput + 5) > 0 && *(signedInput + 6) > 0 &&
*(signedInput + 7) > 0 && *(signedInput + 8) > 0 && *(signedInput + 9) > 0 && *(signedInput + 10) > 0 &&
*(signedInput + 11) > 0;
i += 12;
*(output) = (char)*(input);
*(output + 1) = (char)*(input + 1);
*(output + 2) = (char)*(input + 2);
*(output + 3) = (char)*(input + 3);
*(output + 4) = (char)*(input + 4);
*(output + 5) = (char)*(input + 5);
*(output + 6) = (char)*(input + 6);
*(output + 7) = (char)*(input + 7);
*(output + 8) = (char)*(input + 8);
*(output + 9) = (char)*(input + 9);
*(output + 10) = (char)*(input + 10);
*(output + 11) = (char)*(input + 11);
*(output) = (char)*(signedInput);
*(output + 1) = (char)*(signedInput + 1);
*(output + 2) = (char)*(signedInput + 2);
*(output + 3) = (char)*(signedInput + 3);
*(output + 4) = (char)*(signedInput + 4);
*(output + 5) = (char)*(signedInput + 5);
*(output + 6) = (char)*(signedInput + 6);
*(output + 7) = (char)*(signedInput + 7);
*(output + 8) = (char)*(signedInput + 8);
*(output + 9) = (char)*(signedInput + 9);
*(output + 10) = (char)*(signedInput + 10);
*(output + 11) = (char)*(signedInput + 11);
output += 12;
input += 12;
signedInput += 12;
}
if (i < count - 5)
{
orValue |= *input | *(input + 1) | *(input + 2) | *(input + 3) | *(input + 4) | *(input + 5);
hasZero = hasZero || *input == 0 || *(input + 1) == 0 || *(input + 2) == 0 || *(input + 3) == 0 ||
*(input + 4) == 0 || *(input + 5) == 0;
isValid = isValid && *signedInput > 0 && *(signedInput + 1) > 0 && *(signedInput + 2) > 0 &&
*(signedInput + 3) > 0 && *(signedInput + 4) > 0 && *(signedInput + 5) > 0;
i += 6;
*(output) = (char)*(input);
*(output + 1) = (char)*(input + 1);
*(output + 2) = (char)*(input + 2);
*(output + 3) = (char)*(input + 3);
*(output + 4) = (char)*(input + 4);
*(output + 5) = (char)*(input + 5);
*(output) = (char)*(signedInput);
*(output + 1) = (char)*(signedInput + 1);
*(output + 2) = (char)*(signedInput + 2);
*(output + 3) = (char)*(signedInput + 3);
*(output + 4) = (char)*(signedInput + 4);
*(output + 5) = (char)*(signedInput + 5);
output += 6;
input += 6;
signedInput += 6;
}
if (i < count - 3)
{
orValue |= *input | *(input + 1) | *(input + 2) | *(input + 3);
hasZero = hasZero || *input == 0 || *(input + 1) == 0 || *(input + 2) == 0 || *(input + 3) == 0;
isValid = isValid && *signedInput > 0 && *(signedInput + 1) > 0 && *(signedInput + 2) > 0 &&
*(signedInput + 3) > 0;
i += 4;
*(output) = (char)*(input);
*(output + 1) = (char)*(input + 1);
*(output + 2) = (char)*(input + 2);
*(output + 3) = (char)*(input + 3);
*(output) = (char)*(signedInput);
*(output + 1) = (char)*(signedInput + 1);
*(output + 2) = (char)*(signedInput + 2);
*(output + 3) = (char)*(signedInput + 3);
output += 4;
input += 4;
signedInput += 4;
}
while (i < count)
{
orValue |= *input;
hasZero = hasZero || *input == 0;
isValid = isValid && *signedInput > 0;
i++;
*output = (char)*input;
*output = (char)*signedInput;
output++;
input++;
signedInput++;
}
return (orValue & 0x80) == 0 && !hasZero;
return isValid;
}
}
}