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TI Editor/Assembler: Floating-Point Math
Video (07:51)

In the continuation of the assembly language series, this episode goes over some principles of floating-point arithmetic in TI assembly, and the numerous operations in the TI's built-in libraries.

In this video, we cover the following:

  • Floating-point numbers, in computing and assembly
  • The Radix-100 format
  • Floating-point assembly operations
  • The floating-point accumulator (FAC) and arguments (ARG)
  • XMLLNK library
  • GPLLNK library
  • Errors during calculations
  • Speed considerations
  • Program example - FLOAT

FLOAT (Assembly language)

Demonstration of assembly from the video. Displays two floating-point numbers, performs multiplication on them, and displays the result.

DEF RUN REF VSBW,VMBW,GPLLNK,XMLLNK * OP1 BYTE 65,09,14,21,00,00,00,00 OP2 BYTE 64,03,80,77,00,00,00,00 RES BSS 8 FAC EQU >834A ARG EQU >835C FIL BYTE >83 EVEN * DISPLAY FLOATING-POINT NUMBER * R0 - VDP LOCATION * R1 - ADDRESS OF NUMBER DSPFLT MOV R0,R3 LI R2,FAC MOV *R1+,*R2+ MOV *R1+,*R2+ MOV *R1+,*R2+ MOV *R1,*R2 BLWP @GPLLNK DATA >0014 MOVB @FAC+11,R1 SWPB R1 MOVB @FIL,R1 CLR R2 MOVB @FAC+12,R2 SWPB R2 BLWP @VMBW RT CALC MOV *R0+,@FAC MOV *R0+,@FAC+2 MOV *R0+,@FAC+4 MOV *R0,@FAC+6 MOV *R1+,@ARG MOV *R1+,@ARG+2 MOV *R1+,@ARG+4 MOV *R1,@ARG+6 BLWP @XMLLNK DATA >0800 MOV @FAC,*R2+ MOV @FAC+2,*R2+ MOV @FAC+4,*R2+ MOV @FAC+6,*R2+ RT RUN * PRINT OP1 LI R0,>004D LI R1,OP1 BL @DSPFLT * PRINT OP2 LI R0,>006D LI R1,OP2 BL @DSPFLT * CALCULATE FLOATING POINT MATH LI R0,OP1 LI R1,OP2 LI R2,RES BL @CALC * PRINT RESULT LI R0,>00AD LI R1,RES BL @DSPFLT * PRINT SYMBOLS LI R0,>006B LI R1,'* ' BLWP @VSBW LI R0,>00AB LI R1,'= ' BLWP @VSBW LOOP JMP LOOP END

Posted in Assembly on 2020-10-28 17:44:00.
Hits: 327