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sort64.htm
ShellSort

This OS-independent macrolibrary can be included to 64bit programs written in EuroAssembler.

The library contains macroinstructions which sort data in memory.

sort64 HEAD

ShellSort TablePtr, NrOfRecords, RecordSize, CallbackProc

This macro can sort a table of records of the same size using the [ShellSort] algorithm. The entire table must be loaded in memory and it will be sorted in situ.

Input

TablePtr is pointer to the 1st record.
NrOfRecords is number of records in the table.
RecordSize is the size of one record in bytes. Table size = NrOfRecords * RecordSize.
CallbackProc is pointer to the callback procedure which sorts two records.

CallbackProc

is called with register calling convention.
It is expected to compare two records and return CF=0 if they are in proper order.
Otherwise it must swap the contents of these records and return CF=1.

Input

RSI is pointer to the first record to compare,
RDI is pointer to the second record to compare.

Output

CF=0 if both records were in desired order, or
CF=1 if both records were in wrong order, but they were swapped now.
RAX,RDX,RSI,RDI may be changed by CallbackProc. Other GPR must be preserved.

Output

None, all registers are preserved.

Example

MyTable DQ 5,1,7,6,3,4,2 ; Unsorted QWORD data. ShellSort MyTable, SIZE# MyTable/8, 8, MyCmpProc MyCmpProc PROC1 MOV RAX,[RSI] MOV RDX,[RDI] CMP RDX,RAX JNC .Done: ; Jump if both records are in the desired order. MOV [RSI],RDX ; Otherwise swap them and return CF. MOV [RDI],RAX .Done: RET ENDP1 MyCmpProc

Tested by

tmac64.htm

ShellSort %MACRO TablePtr,NrOfRecords,RecordSize,CallbackProc
     PUSHQ %CallbackProc,%RecordSize,%NrOfRecords,%NrOfRecords,%TablePtr
     CALL ShellSort64@RT::
ShellSort64@RT:: PROC1
      PUSH RAX,RCX,RDX,RBX,RBP,RSI,RDI
      MOV RBP,RSP
%ShellSortTablePtr     %SET RBP+64
%ShellSortNrOfRecords  %SET RBP+72
%ShellSortRecordNr     %SET RBP+80
%ShellSortRecordSize   %SET RBP+88
%ShellSortCallbackProc %SET RBP+96
 .10: SARQ [%ShellSortNrOfRecords],1
      JNG .90:
      MOV RCX,[%ShellSortRecordNr]
      SUB RCX,[%ShellSortNrOfRecords]
      MOV EBX,1
 .20: MOV RSI,RBX
 .30: MOV RDI,RSI
      ADD RDI,[%ShellSortNrOfRecords]
      PUSH RSI,RDI
       MOV RAX,RSI
       DEC RAX
       MULQ [%ShellSortRecordSize]
       ADD RAX,[%ShellSortTablePtr]
       MOV RSI,RAX
       MOV RAX,RDI
       DEC RAX
       MULQ [%ShellSortRecordSize]
       ADD RAX,[%ShellSortTablePtr]
       MOV RDI,RAX
       CALL [%ShellSortCallbackProc]
      POP RDI,RSI
      JNC .40:
      SUB RSI,[%ShellSortNrOfRecords]
      JA .30:
 .40: INC EBX
      CMP EBX,ECX
      JNA .20:
      JMP .10:
 .90: POP RDI,RSI,RBP,RBX,RDX,RCX,RAX
      RET 5*8
    ENDPROC1 ShellSort64@RT::
 %ENDMACRO ShellSort

   ENDHEAD sort64