Improved CompareDWord: generic, i386, x86-64.
!373 (merged) but for DWords. >_<
Realistic benchmark: in the example from !369 (merged), after replacing CompareByte(n) with CompareDWord(n div 4) and trying current and proposed CompareDWords, I see 0% :( speedup on i386 (disappointing but consistent with the fact that for typical n it uses, ≤128 bytes, they work the same way) and 10% speedup on x86-64.
Unrealistic benchmark: CompareDWordBenchmark.pas.
My results:
i386 x86-64
CompareDWordGeneric: 272 b CompareDWordGeneric: 304 b
CompareDWordGenericV2: 80 b CompareDWordGenericV2: 240 b
Different byte #3 of 4 Different byte #3 of 4
System.CompareDWord: 2.1 ns/call System.CompareDWord: 2.9 ns/call
CompareDWordGeneric: 3.4 ns/call CompareDWordGeneric: 3.2 ns/call
CompareDWordGenericV2: 2.3 ns/call CompareDWordGenericV2: 2.3 ns/call
CompareDWordAsm: 1.6 ns/call CompareDWordAsm: 1.9 ns/call
Different byte #15 of 16 Different byte #15 of 16
System.CompareDWord: 4.2 ns/call System.CompareDWord: 5.8 ns/call
CompareDWordGeneric: 6.4 ns/call CompareDWordGeneric: 6.8 ns/call
CompareDWordGenericV2: 4.2 ns/call CompareDWordGenericV2: 3.1 ns/call
CompareDWordAsm: 3.0 ns/call CompareDWordAsm: 2.1 ns/call
Different byte #27 of 28 Different byte #27 of 28
System.CompareDWord: 4.5 ns/call System.CompareDWord: 7.4 ns/call
CompareDWordGeneric: 11 ns/call CompareDWordGeneric: 7.8 ns/call
CompareDWordGenericV2: 4.8 ns/call CompareDWordGenericV2: 4.3 ns/call
CompareDWordAsm: 4.6 ns/call CompareDWordAsm: 3.0 ns/call
Different byte #31 of 32 Different byte #31 of 32
System.CompareDWord: 4.9 ns/call System.CompareDWord: 7.9 ns/call
CompareDWordGeneric: 12 ns/call CompareDWordGeneric: 8.2 ns/call
CompareDWordGenericV2: 5.7 ns/call CompareDWordGenericV2: 5.4 ns/call
CompareDWordAsm: 5.0 ns/call CompareDWordAsm: 2.6 ns/call
Different byte #35 of 36 Different byte #35 of 36
System.CompareDWord: 5.6 ns/call System.CompareDWord: 8.3 ns/call
CompareDWordGeneric: 13 ns/call CompareDWordGeneric: 8.7 ns/call
CompareDWordGenericV2: 5.9 ns/call CompareDWordGenericV2: 6.2 ns/call
CompareDWordAsm: 5.5 ns/call CompareDWordAsm: 2.7 ns/call
Different byte #95 of 96 Different byte #95 of 96
System.CompareDWord: 11 ns/call System.CompareDWord: 14 ns/call
CompareDWordGeneric: 26 ns/call CompareDWordGeneric: 13 ns/call
CompareDWordGenericV2: 10 ns/call CompareDWordGenericV2: 9.2 ns/call
CompareDWordAsm: 9.4 ns/call CompareDWordAsm: 4.9 ns/call
Different byte #1 of 200 Different byte #1 of 200
System.CompareDWord: 16 ns/call System.CompareDWord: 4.9 ns/call
CompareDWordGeneric: 4.7 ns/call CompareDWordGeneric: 4.6 ns/call
CompareDWordGenericV2: 2.3 ns/call CompareDWordGenericV2: 3.0 ns/call
CompareDWordAsm: 1.6 ns/call CompareDWordAsm: 2.1 ns/call
Different byte #199 of 200 Different byte #199 of 200
System.CompareDWord: 40 ns/call System.CompareDWord: 20 ns/call
CompareDWordGeneric: 56 ns/call CompareDWordGeneric: 19 ns/call
CompareDWordGenericV2: 19 ns/call CompareDWordGenericV2: 15 ns/call
CompareDWordAsm: 17 ns/call CompareDWordAsm: 9.2 ns/call
Different byte #1999 of 2000 Different byte #1999 of 2000
System.CompareDWord: 262 ns/call System.CompareDWord: 193 ns/call
CompareDWordGeneric: 458 ns/call CompareDWordGeneric: 136 ns/call ← should be same as System.CompareDWord,
CompareDWordGenericV2: 159 ns/call CompareDWordGenericV2: 126 ns/call ignore this...
CompareDWordAsm: 162 ns/call CompareDWordAsm: 75 ns/callEdited by Rika