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;
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;
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; Purpose: Zip assembly file for running doing an unsigned divide.
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; Purpose: Zip assembly file for running doing an unsigned divide.
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; This routine is also called by the signed divide.
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; This routine is also called by the signed divide.
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;
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;
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; Creator: Dan Gisselquist, Ph.D.
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; Creator: Dan Gisselquist, Ph.D.
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; Gisselquist Tecnology, LLC
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; Gisselquist Technology, LLC
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;
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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;
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; Copyright (C) 2015, Gisselquist Technology, LLC
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; Copyright (C) 2015, Gisselquist Technology, LLC
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;
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;
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;
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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;
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;
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;
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;
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;
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divu: ; Given R0,R1, computer R0 = R0/R1 and R1 = R0%R1
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lib_divu: ; Given R0,R1, computer R0 = R0/R1 and R1 = R0%R1
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TST -1,R1
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TST -1,R1
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; BNZ divu_valid_divide
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; BNZ divu_valid_divide
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CLR.Z R0 ; Should be a divide by zero error / trap
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CLR.Z R0 ; Should be a divide by zero error / trap
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RETN.Z
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JMP.Z R2
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divu_valid_divide:
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divu_valid_divide:
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SUB 1,SP
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SUB 2,SP
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STO R2,(SP)
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STO R3,1(SP)
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STO R3,1(SP)
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;
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;
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LDI 1,R2 ; Here's where we record the bit we are working on
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LDI 1,R2 ; Here's where we record the bit we are working on
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CLR R3 ; Here's where we build our result
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CLR R3 ; Here's where we build our result
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; Our original loop rejoin point, before a touch of unrolling
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; Our original loop rejoin point, before a touch of unrolling
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Line 120... |
Line 121... |
BNZ divu_next_loop
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BNZ divu_next_loop
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divu_record_result:
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divu_record_result:
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MOV R0,R1
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MOV R0,R1
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MOV R3,R0
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MOV R3,R0
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LOD (SP),R2
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LOD 1(SP),R3
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LOD 1(SP),R3
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LOD 2(SP),R2
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ADD 2,SP
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ADD 1,SP
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JMP R2
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JMP R2
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