489 lines
16 KiB
Plaintext
489 lines
16 KiB
Plaintext
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.BP
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.AP "EM INTERPRETER"
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.nf
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.ta 8 16 24 32 40 48 56 64 72 80
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.so em.i
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.fi
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.BP
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.AP "EM CODE TABLES"
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The following table is used by the assembler for EM machine
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language.
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It specifies the opcodes used for each instruction and
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how arguments are mapped to machine language arguments.
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The table is presented in three columns,
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each line in each column contains three or four fields.
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Each line describes a range of interpreter opcodes by
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specifying for which instruction the range is used, the type of the
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opcodes (mini, shortie, etc..) and range for the instruction
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argument.
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.A
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The first field on each line gives the EM instruction mnemonic,
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the second field gives some flags.
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If the opcodes are minis or shorties the third field specifies
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how many minis/shorties are used.
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The last field gives the number of the (first) interpreter
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opcode.
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.N 1
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Flags :
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.IS 3
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.N 1
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Opcode type, only one of the following may be specified.
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.PS - 5 " "
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.PT -
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opcode without argument
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.PT m
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mini
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.PT s
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shortie
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.PT 2
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opcode with 2-byte signed argument
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.PT 4
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opcode with 4-byte signed argument
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.PT 8
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opcode with 8-byte signed argument
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.PE
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Secondary (escaped) opcodes.
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.PS - 5 " "
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.PT e
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The opcode thus marked is in the secondary opcode group instead
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of the primary
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.PE
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restrictions on arguments
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.PS - 5 " "
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.PT N
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Negative arguments only
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.PT P
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Positive and zero arguments only
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.PE
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mapping of arguments
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.PS - 5 " "
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.PT w
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argument must be divisible by the wordsize and is divided by the
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wordsize before use as opcode argument.
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.PT o
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argument ( possibly after division ) must be >= 1 and is
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decremented before use as opcode argument
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.PE
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.IE
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If the opcode type is 2,4 or 8 the resulting argument is used as
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opcode argument (least significant byte first).
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.N
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If the opcode type is mini, the argument is added
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to the first opcode - if in range - .
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If the argument is negative, the absolute value minus one is
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used in the algorithm above.
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.N
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For shorties with positive arguments the first opcode is used
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for arguments in the range 0..255, the second for the range
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256..511, etc..
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For shorties with negative arguments the first opcode is used
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for arguments in the range -1..-256, the second for the range
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-257..-512, etc..
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The byte following the opcode contains the least significant
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byte of the argument.
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First some examples of these specifications.
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.PS - 5
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.PT "aar mwPo 1 34"
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Indicates that opcode 34 is used as a mini for Positive
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instruction arguments only.
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The w and o indicate division and decrementing of the
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instruction argument.
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Because the resulting argument must be zero ( only opcode 34 may be used
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), this mini can only be used for instruction argument 2.
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Conclusion: opcode 34 is for "AAR 2".
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.PT "adp sP 1 41"
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Opcode 41 is used as shortie for ADP with arguments in the range
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0..255.
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.PT "bra sN 2 60"
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Opcode 60 is used as shortie for BRA with arguments -1..-256,
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61 is used for arguments -257..-512.
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.PT "zer e- 145"
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Escaped opcode 145 is used for ZER.
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.PE
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The interpreter opcode table:
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.N 1
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.IS 3
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.DS B
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.so itables
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.DE 0
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.IE
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.P
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The table above results in the following dispatch tables.
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Dispatch tables are used by interpreters to jump to the
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routines implementing the EM instructions, indexed by the next opcode.
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Each line of the dispatch tables gives the routine names
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of eight consecutive opcodes, preceded by the first opcode number
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on that line.
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Routine names consist of an EM mnemonic followed by a suffix.
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The suffices show the encoding used for each opcode.
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.N
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The following suffices exist:
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.N 1
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.VS 1 0
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.IS 4
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.PS - 11
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.PT .z
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no arguments
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.PT .l
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16-bit argument
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.PT .lw
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16-bit argument divided by the wordsize
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.PT .p
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positive 16-bit argument
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.PT .pw
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positive 16-bit argument divided by the wordsize
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.PT .n
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negative 16-bit argument
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.PT .nw
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negative 16-bit argument divided by the wordsize
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.PT .s<num>
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shortie with <num> as high order argument byte
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.PT .sw<num>
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shortie with argument divided by the wordsize
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.PT .<num>
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mini with <num> as argument
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.PT .<num>W
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mini with <num>*wordsize as argument
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.PE 3
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<num> is a possibly negative integer.
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.VS 1 1
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.IE
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The dispatch table for the 256 primary opcodes:
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.DS B
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0 loc.0 loc.1 loc.2 loc.3 loc.4 loc.5 loc.6 loc.7
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8 loc.8 loc.9 loc.10 loc.11 loc.12 loc.13 loc.14 loc.15
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16 loc.16 loc.17 loc.18 loc.19 loc.20 loc.21 loc.22 loc.23
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24 loc.24 loc.25 loc.26 loc.27 loc.28 loc.29 loc.30 loc.31
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32 loc.32 loc.33 aar.1W adf.s0 adi.1W adi.2W adp.l adp.1
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40 adp.2 adp.s0 adp.s-1 ads.1W and.1W asp.1W asp.2W asp.3W
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48 asp.4W asp.5W asp.w0 beq.l beq.s0 bge.s0 bgt.s0 ble.s0
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56 blm.s0 blt.s0 bne.s0 bra.l bra.s-1 bra.s-2 bra.s0 bra.s1
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64 cal.1 cal.2 cal.3 cal.4 cal.5 cal.6 cal.7 cal.8
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72 cal.9 cal.10 cal.11 cal.12 cal.13 cal.14 cal.15 cal.16
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80 cal.17 cal.18 cal.19 cal.20 cal.21 cal.22 cal.23 cal.24
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88 cal.25 cal.26 cal.27 cal.28 cal.s0 cff.z cif.z cii.z
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96 cmf.s0 cmi.1W cmi.2W cmp.z cms.s0 csa.1W csb.1W dec.z
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104 dee.w0 del.w-1 dup.1W dvf.s0 dvi.1W fil.l inc.z ine.lw
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112 ine.w0 inl.-1W inl.-2W inl.-3W inl.w-1 inn.s0 ior.1W ior.s0
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120 lae.l lae.w0 lae.w1 lae.w2 lae.w3 lae.w4 lae.w5 lae.w6
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128 lal.p lal.n lal.0 lal.-1 lal.w0 lal.w-1 lal.w-2 lar.W
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136 ldc.0 lde.lw lde.w0 ldl.0 ldl.w-1 lfr.1W lfr.2W lfr.s0
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144 lil.w-1 lil.w0 lil.0 lil.1W lin.l lin.s0 lni.z loc.l
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152 loc.-1 loc.s0 loc.s-1 loe.lw loe.w0 loe.w1 loe.w2 loe.w3
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160 loe.w4 lof.l lof.1W lof.2W lof.3W lof.4W lof.s0 loi.l
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168 loi.1 loi.1W loi.2W loi.3W loi.4W loi.s0 lol.pw lol.nw
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176 lol.0 lol.1W lol.2W lol.3W lol.-1W lol.-2W lol.-3W lol.-4W
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184 lol.-5W lol.-6W lol.-7W lol.-8W lol.w0 lol.w-1 lxa.1 lxl.1
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192 lxl.2 mlf.s0 mli.1W mli.2W rck.1W ret.0 ret.1W ret.s0
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200 rmi.1W sar.1W sbf.s0 sbi.1W sbi.2W sdl.w-1 set.s0 sil.w-1
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208 sil.w0 sli.1W ste.lw ste.w0 ste.w1 ste.w2 stf.l stf.W
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216 stf.2W stf.s0 sti.1 sti.1W sti.2W sti.3W sti.4W sti.s0
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224 stl.pw stl.nw stl.0 stl.1W stl.-1W stl.-2W stl.-3W stl.-4W
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232 stl.-5W stl.w-1 teq.z tgt.z tlt.z tne.z zeq.l zeq.s0
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240 zeq.s1 zer.s0 zge.s0 zgt.s0 zle.s0 zlt.s0 zne.s0 zne.s-1
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248 zre.lw zre.w0 zrl.-1W zrl.-2W zrl.w-1 zrl.nw escape1 escape2
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.DE 2
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The list of secondary opcodes (escape1):
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.N 1
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.DS B
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0 aar.l aar.z adf.l adf.z adi.l adi.z ads.l ads.z
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8 adu.l adu.z and.l and.z asp.lw ass.l ass.z bge.l
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16 bgt.l ble.l blm.l bls.l bls.z blt.l bne.l cai.z
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24 cal.l cfi.z cfu.z ciu.z cmf.l cmf.z cmi.l cmi.z
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32 cms.l cms.z cmu.l cmu.z com.l com.z csa.l csa.z
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40 csb.l csb.z cuf.z cui.z cuu.z dee.lw del.pw del.nw
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48 dup.l dus.l dus.z dvf.l dvf.z dvi.l dvi.z dvu.l
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56 dvu.z fef.l fef.z fif.l fif.z inl.pw inl.nw inn.l
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64 inn.z ior.l ior.z lar.l lar.z ldc.l ldf.l ldl.pw
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72 ldl.nw lfr.l lil.pw lil.nw lim.z los.l los.z lor.s0
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80 lpi.l lxa.l lxl.l mlf.l mlf.z mli.l mli.z mlu.l
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88 mlu.z mon.z ngf.l ngf.z ngi.l ngi.z nop.z rck.l
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96 rck.z ret.l rmi.l rmi.z rmu.l rmu.z rol.l rol.z
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104 ror.l ror.z rtt.z sar.l sar.z sbf.l sbf.z sbi.l
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112 sbi.z sbs.l sbs.z sbu.l sbu.z sde.l sdf.l sdl.pw
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120 sdl.nw set.l set.z sig.z sil.pw sil.nw sim.z sli.l
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128 sli.z slu.l slu.z sri.l sri.z sru.l sru.z sti.l
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136 sts.l sts.z str.s0 tge.z tle.z trp.z xor.l xor.z
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144 zer.l zer.z zge.l zgt.l zle.l zlt.l zne.l zrf.l
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152 zrf.z zrl.pw dch.z exg.s0 exg.l exg.z lpb.z gto.l
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.DE 2
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Finally, the list of opcodes with four byte arguments (escape2).
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.DS
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0 loc
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.DE 0
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.BP
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.AP "AN EXAMPLE PROGRAM"
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.DS B
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1 program example(output);
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2 {This program just demonstrates typical EM code.}
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3 type rec = record r1: integer; r2:real; r3: boolean end;
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4 var mi: integer; mx:real; r:rec;
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5
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6 function sum(a,b:integer):integer;
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7 begin
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8 sum := a + b
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9 end;
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10
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11 procedure test(var r: rec);
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12 label 1;
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13 var i,j: integer;
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14 x,y: real;
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15 b: boolean;
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16 c: char;
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17 a: array[1..100] of integer;
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18
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19 begin
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20 j := 1;
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21 i := 3 * j + 6;
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22 x := 4.8;
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23 y := x/0.5;
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24 b := true;
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25 c := 'z';
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26 for i:= 1 to 100 do a[i] := i * i;
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27 r.r1 := j+27;
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28 r.r3 := b;
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29 r.r2 := x+y;
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30 i := sum(r.r1, a[j]);
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31 while i > 0 do begin j := j + r.r1; i := i - 1 end;
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32 with r do begin r3 := b; r2 := x+y; r1 := 0 end;
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33 goto 1;
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34 1: writeln(j, i:6, x:9:3, b)
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35 end; {test}
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36 begin {main program}
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37 mx := 15.96;
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38 mi := 99;
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39 test(r)
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40 end.
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.DE 0
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.BP
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The EM code as produced by the Pascal-VU compiler is given below. Comments
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have been added manually. Note that this code has already been optimized.
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.DS B
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mes 2,2,2 ; wordsize 2, pointersize 2
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.1
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rom 't.p\e000' ; the name of the source file
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hol 552,-32768,0 ; externals and buf occupy 552 bytes
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exp $sum ; sum can be called from other modules
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pro $sum,2 ; procedure sum; 2 bytes local storage
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lin 8 ; code from source line 8
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ldl 0 ; load two locals ( a and b )
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adi 2 ; add them
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ret 2 ; return the result
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end 2 ; end of procedure ( still two bytes local storage )
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.2
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rom 1,99,2 ; descriptor of array a[]
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exp $test ; the compiler exports all level 0 procedures
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pro $test,226 ; procedure test, 226 bytes local storage
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.3
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rom 4.8F8 ; assemble Floating point 4.8 (8 bytes) in
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.4 ; global storage
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rom 0.5F8 ; same for 0.5
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mes 3,-226,2,2 ; compiler temporary not referenced by address
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mes 3,-24,2,0 ; the same is true for i, j, b and c in test
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mes 3,-22,2,0
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mes 3,-4,2,0
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mes 3,-2,2,0
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mes 3,-20,8,0 ; and for x and y
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mes 3,-12,8,0
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lin 20 ; maintain source line number
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loc 1
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stl -4 ; j := 1
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lni ; lin 21 prior to optimization
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lol -4
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loc 3
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mli 2
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loc 6
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adi 2
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stl -2 ; i := 3 * j + 6
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lni ; lin 22 prior to optimization
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lae .3
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loi 8
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lal -12
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sti 8 ; x := 4.8
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lni ; lin 23 prior to optimization
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lal -12
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loi 8
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lae .4
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loi 8
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dvf 8
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lal -20
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sti 8 ; y := x / 0.5
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lni ; lin 24 prior to optimization
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loc 1
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stl -22 ; b := true
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lni ; lin 25 prior to optimization
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loc 122
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stl -24 ; c := 'z'
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lni ; lin 26 prior to optimization
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loc 1
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stl -2 ; for i:= 1
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2
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lol -2
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dup 2
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mli 2 ; i*i
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lal -224
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lol -2
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lae .2
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sar 2 ; a[i] :=
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lol -2
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loc 100
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beq *3 ; to 100 do
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inl -2 ; increment i and loop
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bra *2
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3
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lin 27
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lol -4
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loc 27
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adi 2 ; j + 27
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sil 0 ; r.r1 :=
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lni ; lin 28 prior to optimization
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lol -22 ; b
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lol 0
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stf 10 ; r.r3 :=
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lni ; lin 29 prior to optimization
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lal -20
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loi 16
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adf 8 ; x + y
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lol 0
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adp 2
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sti 8 ; r.r2 :=
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lni ; lin 23 prior to optimization
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lal -224
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lol -4
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lae .2
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lar 2 ; a[j]
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lil 0 ; r.r1
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cal $sum ; call now
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asp 4 ; remove parameters from stack
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lfr 2 ; get function result
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stl -2 ; i :=
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4
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lin 31
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lol -2
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zle *5 ; while i > 0 do
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lol -4
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lil 0
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adi 2
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stl -4 ; j := j + r.r1
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del -2 ; i := i - 1
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bra *4 ; loop
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5
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lin 32
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lol 0
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stl -226 ; make copy of address of r
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lol -22
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lol -226
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stf 10 ; r3 := b
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lal -20
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loi 16
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adf 8
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lol -226
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adp 2
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sti 8 ; r2 := x + y
|
||
|
loc 0
|
||
|
sil -226 ; r1 := 0
|
||
|
lin 34 ; note the abscence of the unnecesary jump
|
||
|
lae 22 ; address of output structure
|
||
|
lol -4
|
||
|
cal $_wri ; write integer with default width
|
||
|
asp 4 ; pop parameters
|
||
|
lae 22
|
||
|
lol -2
|
||
|
loc 6
|
||
|
cal $_wsi ; write integer width 6
|
||
|
asp 6
|
||
|
lae 22
|
||
|
lal -12
|
||
|
loi 8
|
||
|
loc 9
|
||
|
loc 3
|
||
|
cal $_wrf ; write fixed format real, width 9, precision 3
|
||
|
asp 14
|
||
|
lae 22
|
||
|
lol -22
|
||
|
cal $_wrb ; write boolean, default width
|
||
|
asp 4
|
||
|
lae 22
|
||
|
cal $_wln ; writeln
|
||
|
asp 2
|
||
|
ret 0 ; return, no result
|
||
|
end 226
|
||
|
exp $_main
|
||
|
pro $_main,0 ; main program
|
||
|
.6
|
||
|
con 2,-1,22 ; description of external files
|
||
|
.5
|
||
|
rom 15.96F8
|
||
|
fil .1 ; maintain source file name
|
||
|
lae .6 ; description of external files
|
||
|
lae 0 ; base of hol area to relocate buffer addresses
|
||
|
cal $_ini ; initialize files, etc...
|
||
|
asp 4
|
||
|
lin 37
|
||
|
lae .5
|
||
|
loi 8
|
||
|
lae 2
|
||
|
sti 8 ; mx := 15.96
|
||
|
lni ; lin 38 prior to optimization
|
||
|
loc 99
|
||
|
ste 0 ; mi := 99
|
||
|
lni ; lin 39 prior to optimization
|
||
|
lae 10 ; address of r
|
||
|
cal $test
|
||
|
asp 2
|
||
|
loc 0 ; normal exit
|
||
|
cal $_hlt ; cleanup and finish
|
||
|
asp 2
|
||
|
end 0
|
||
|
mes 5 ; reals were used
|
||
|
.DE 0
|
||
|
The compact code corresponding to the above program is listed below.
|
||
|
Read it horizontally, line by line, not column by column.
|
||
|
Each number represents a byte of compact code, printed in decimal.
|
||
|
The first two bytes form the magic word.
|
||
|
.N 1
|
||
|
.IS 3
|
||
|
.DS B
|
||
|
173 0 159 122 122 122 255 242 1 161 250 124 116 46 112 0
|
||
|
255 156 245 40 2 245 0 128 120 155 249 123 115 117 109 160
|
||
|
249 123 115 117 109 122 67 128 63 120 3 122 88 122 152 122
|
||
|
242 2 161 121 219 122 255 155 249 124 116 101 115 116 160 249
|
||
|
124 116 101 115 116 245 226 0 242 3 161 253 128 123 52 46
|
||
|
56 255 242 4 161 253 128 123 48 46 53 255 159 123 245 30
|
||
|
255 122 122 255 159 123 96 122 120 255 159 123 98 122 120 255
|
||
|
159 123 116 122 120 255 159 123 118 122 120 255 159 123 100 128
|
||
|
120 255 159 123 108 128 120 255 67 140 69 121 113 116 68 73
|
||
|
116 69 123 81 122 69 126 3 122 113 118 68 57 242 3 72
|
||
|
128 58 108 112 128 68 58 108 72 128 57 242 4 72 128 44
|
||
|
128 58 100 112 128 68 69 121 113 98 68 69 245 122 0 113
|
||
|
96 68 69 121 113 118 182 73 118 42 122 81 122 58 245 32
|
||
|
255 73 118 57 242 2 94 122 73 118 69 220 10 123 54 118
|
||
|
18 122 183 67 147 73 116 69 147 3 122 104 120 68 73 98
|
||
|
73 120 111 130 68 58 100 72 136 2 128 73 120 4 122 112
|
||
|
128 68 58 245 32 255 73 116 57 242 2 59 122 65 120 20
|
||
|
249 123 115 117 109 8 124 64 122 113 118 184 67 151 73 118
|
||
|
128 125 73 116 65 120 3 122 113 116 41 118 18 124 185 67
|
||
|
152 73 120 113 245 30 255 73 98 73 245 30 255 111 130 58
|
||
|
100 72 136 2 128 73 245 30 255 4 122 112 128 69 120 104
|
||
|
245 30 255 67 154 57 142 73 116 20 249 124 95 119 114 105
|
||
|
8 124 57 142 73 118 69 126 20 249 124 95 119 115 105 8
|
||
|
126 57 142 58 108 72 128 69 129 69 123 20 249 124 95 119
|
||
|
114 102 8 134 57 142 73 98 20 249 124 95 119 114 98 8
|
||
|
124 57 142 20 249 124 95 119 108 110 8 122 88 120 152 245
|
||
|
226 0 155 249 125 95 109 97 105 110 160 249 125 95 109 97
|
||
|
105 110 120 242 6 151 122 119 142 255 242 5 161 253 128 125
|
||
|
49 53 46 57 54 255 50 242 1 57 242 6 57 120 20 249
|
||
|
124 95 105 110 105 8 124 67 157 57 242 5 72 128 57 122
|
||
|
112 128 68 69 219 110 120 68 57 130 20 249 124 116 101 115
|
||
|
116 8 122 69 120 20 249 124 95 104 108 116 8 122 152 120
|
||
|
159 124 160 255 159 125 255
|
||
|
.DE 0
|
||
|
.IE
|
||
|
.MS T A 0
|
||
|
.ME
|
||
|
.BP
|
||
|
.MS B A 0
|
||
|
.ME
|
||
|
.CT
|