derek.holloway
7502bf64a4
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255 lines
5.4 KiB
ArmAsm
255 lines
5.4 KiB
ArmAsm
# mach: bfin
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// The assembly program uses two instructions to speed the decoder inner loop:
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// R6= VMAX/VMAX (R5, R4) A0>>2;
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// R2 =H+L (SGN(R0)*R1);
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// VMAX is a 2-way parallel comparison of four updated path metrics, resulting
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// in 2 new path metrics as well as a 2 bit field indicating the selection
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// results. This 2 bit field is shifted into accumulator A0. This instruction
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// implements the selections of a complete butterfly for a rate 1/n system.
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// The H+L(SGN) instruction is used to compute the branch metric used by each
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// butterfly. It takes as input a pair of values representing the received
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// symbol, and another pair of values which are +1 or -1. The latter come
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// from a pre-computed table that holds all the branch metric information for
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// a specific set of polynomials. As all symbols are assumed to be binary,
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// distance metrics between a received symbol and a branch metric are computed
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// by adding and subtracting the values of the symbol according to the
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// transition of a branch.
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.include "testutils.inc"
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start
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// 16 in bytes for M2
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// A few pointer initializations
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// P2 points to decision history, where outputs are stored
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loadsym P2, DecisionHistory
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// P4 holds address of APMFrom
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loadsym P4, APMFrom;
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// P5 holds address of APMTo
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loadsym P5, APMTo;
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// I0 points to precomputed d's
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loadsym I0, BranchStorage;
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M2.L = 32;
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loadsym P0, InputData;
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// storage for all precomputed branch metrics
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loadsym P1, BranchStorage;
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R6 = 0; R0 = 0; // inits
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R0.L = 0x0001;
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R0.H = 0x0001;
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[ P1 + 0 ] = R0;
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R0.L = 0xffff;
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R0.H = 0xffff;
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[ P1 + 4 ] = R0;
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R0.L = 0xffff;
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R0.H = 0x0001;
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[ P1 + 8 ] = R0;
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R0.L = 0x0001;
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R0.H = 0xffff;
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[ P1 + 12 ] = R0;
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R0.L = 0xffff;
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R0.H = 0x0001;
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[ P1 + 16 ] = R0;
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R0.L = 0x0001;
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R0.H = 0xffff;
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[ P1 + 20 ] = R0;
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R0.L = 0x0001;
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R0.H = 0x0001;
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[ P1 + 24 ] = R0;
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R0.L = 0xffff;
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R0.H = 0xffff;
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[ P1 + 28 ] = R0;
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R0.L = 0x0001;
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R0.H = 0xffff;
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[ P1 + 32 ] = R0;
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R0.L = 0xffff;
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R0.H = 0x0001;
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[ P1 + 36 ] = R0;
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R0.L = 0xffff;
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R0.H = 0xffff;
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[ P1 + 40 ] = R0;
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R0.L = 0x0001;
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R0.H = 0x0001;
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[ P1 + 44 ] = R0;
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R0.L = 0xffff;
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R0.H = 0xffff;
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[ P1 + 48 ] = R0;
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R0.L = 0x0001;
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R0.H = 0x0001;
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[ P1 + 52 ] = R0;
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R0.L = 0x0001;
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R0.H = 0xffff;
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[ P1 + 56 ] = R0;
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R0.L = 0xffff;
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R0.H = 0x0001;
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[ P1 + 60 ] = R0;
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P1 = 18;
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LSETUP ( L$0 , L$0end ) LC0 = P1; // SymNo loop start
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L$0:
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// Get a symbol and leave it resident in R1
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R1 = [ P0 ]; // R1=(InputData[SymNo*2+1] InputData[SymNo*2])
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P0 += 4;
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A0 = 0;
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// I0 points to precomputed D1, D0
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loadsym I0, BranchStorage;
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I1 = P4; // I1 points to APM[From]
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I2 = P4;
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I2 += M2; // I2 points to APM[From+16]
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I3 = P5; // I3 points to APM[To]
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P1 = 16;
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P1 += -1;
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LSETUP ( L$1 , L$1end ) LC1 = P1;
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// APMFrom and APMTo are in alternate
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// memory banks.
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R0 = [ I0 ++ ]; // load R0 = (D1 D0)
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R3.L = W [ I1 ++ ]; // load RL3 = PM0
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// (R1 holds current symbol)
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R2.H = R2.L = SIGN(R0.H) * R1.H + SIGN(R0.L) * R1.L; // apply sum-on-sign instruction
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R3.H = W [ I2 ++ ]; // now, R3 = (PM1 PM0)
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L$1:
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R5 = R3 +|- R2 , R4 = R3 -|+ R2 || R0 = [ I0 ++ ] || NOP;
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// R5 = (PM11 PM01) R4 = (PM10 PM00)
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// and load next (D1 D0)
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R6 = VIT_MAX( R5 , R4 ) (ASR) || R3.L = W [ I1 ++ ] || NOP;
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// do 2 ACS in parallel
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// R6 = (nPM1 nPM0) and update to A0
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L$1end:
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R2.H = R2.L = SIGN(R0.H) * R1.H + SIGN(R0.L) * R1.L || R3.H = W [ I2 ++ ] || [ I3 ++ ] = R6;
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// store new path metrics in
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// two consecutive locations
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R5 = R3 +|- R2 , R4 = R3 -|+ R2;
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R6 = VIT_MAX( R5 , R4 ) (ASR);
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[ I3 ++ ] = R6;
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R7 = A0.w;
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[ P2 ] = R7;
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P2 += 4; // store history
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FP = P4; // swap pointers From <--> To
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P4 = P5;
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L$0end:
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P5 = FP;
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// check results
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loadsym I0, DecisionHistory
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x6ff2 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0xf99f );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x9909 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x6666 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x0096 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x6996 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x9309 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x0000 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0xffff );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0xffff );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0xf0ff );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0xcf00 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x9009 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x07f6 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x6004 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x6996 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x8338 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x3443 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x6bd6 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x6197 );
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R0.L = W [ I0 ++ ]; DBGA ( R0.L , 0x6c26 );
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R0.H = W [ I0 ++ ]; DBGA ( R0.H , 0x0990 );
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pass
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.data
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.align 8
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InputData:
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.dw 0x0001
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.dw 0x0001
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.dw 0xffff
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.dw 0xfffb
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.dw 0x0005
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.dw 0x0001
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.dw 0xfffd
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.dw 0xfffd
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.dw 0x0005
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.dw 0x0001
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.dw 0x0001
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.dw 0x0001
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.dw 0xffff
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.dw 0xfffb
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.dw 0x0005
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.dw 0x0001
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.dw 0xfffd
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.dw 0xfffd
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.dw 0x0005
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.dw 0x0001
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.align 8
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APMFrom:
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.dw 0xc000
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.dw 0x0
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.dw 0xc000
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.align 8
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APMTo:
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.space (32*8)
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.align 8
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BranchStorage:
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.space (32*8)
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.align 8
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DecisionHistory:
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.space (18*4)
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