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Ceil64 Challenge
The objective is to build the fastest extension for RTL Ceil
Call
Ceil64 to obtain the lowest Int64 greater than or equal to X. For
example:
Ceil64(-2.8) = -2
Ceil64(2.8) =
3
Ceil64(-1.0) = -1
There are three overloaded
functions differing in the input datatype.
function
Ceil64(const X: Extended): Int64; overload;
function Ceil64(const X:
Double): Int64; overload;
function Ceil64(const X: Single): Int64;
overload;
Note: The absolute value of X must be less than
MaxInt64 = $7FFFFFFFFFFFFFFF;
Validation and Benchmark Tool
Tables of results
Extended
| Target | Function | Author |
| P4 Northwood | CeilExtendedRTL | Borland |
| P4 Prescott | CeilExtendedDKCSSE3 | Dennis Christensen |
| Pentium M | CeilExtendedJOH | John O'Harrow |
| P3 | CeilExtendedJOH | John O'Harrow |
| Athlon XP | CeilExtendedJOH | John O'Harrow |
| Opteron | CeilExtendedJOH | John O'Harrow |
| RTL Suggestion | CeilExtendedJOH | John O'Harrow |
| Pascal | CeilExtendedRTL | Borland |
| Blended | CeilExtendedJOH | John O'Harrow |
Double
| Target | Function | Author |
| P4 Northwood | CeilDoubleJOH2 | John O'Harrow |
| P4 Prescott | CeilDoubleJOH2 | John O'Harrow |
| Pentium M | CeilDoubleJOH | John O'Harrow |
| P3 | CeilDoubleJOH2 | John O'Harrow |
| Athlon XP | CeilDoubleJOH | John O'Harrow |
| Opteron | CeilDoubleJOH | John O'Harrow |
| RTL Suggestion | CeilDoubleJOH | John O'Harrow |
| Pascal | CeilDoubleDKCPas4 | Dennis Christensen |
| Blended | CeilDoubleJOH | John O'Harrow |
Single
| Target | Function | Author |
| P4 Northwood | CeilSingleJOH | Dennis Christensen |
| P4 Prescott | CeilSingleDKCSSE3 | Dennis Christensen |
| Pentium M | CeilSingleJOH | John O'Harrow |
| P3 | CeilSingleJOH | John O'Harrow |
| Athlon XP | CeilSingleDKC2 | Dennis Christensen |
| Opteron | CeilSingleDKC2 | Dennis Christensen |
| RTL Suggestion | CeilSingleJOH | John O'Harrow |
| Pascal | CeilSingleDKCPas4 | Dennis Christensen |
| Blended | CeilSingleJOH | John O'Harrow |