ocmbytecode
Differences
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| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
| ocmbytecode [2023/04/23 14:51] – [Opcodes 20..2F] nopsled | ocmbytecode [2023/04/23 14:55] – [Opcodes 40..4F] nopsled | ||
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| Line 346: | Line 346: | ||
| ===== Opcodes 30..3F ===== | ===== Opcodes 30..3F ===== | ||
| - | === Opcode 0x30 (48): Compare DWORDs for Equality === | + | === Opcode 0x30 (48): Compare DWORDs for Equality |
| stack input: small/big int a (next to top); small/big int b (top of stack) | stack input: small/big int a (next to top); small/big int b (top of stack) | ||
| Line 353: | Line 353: | ||
| note: See Opcode 22 for important notes on DWORD instructions. | note: See Opcode 22 for important notes on DWORD instructions. | ||
| - | === Opcode 0x31 (49): Execute === | + | === Opcode 0x31 (49): Execute |
| stack input: binary blob containing bytecode | stack input: binary blob containing bytecode | ||
| Line 362: | Line 362: | ||
| PostScript equivalent: " | PostScript equivalent: " | ||
| - | === Opcode 0x32 (50): If/Else === | + | === Opcode 0x32 (50): If/ |
| stack input: selector (smallint at second to top of stack), blob for the true case (next to top), blob for the false case (top of stack) | stack input: selector (smallint at second to top of stack), blob for the true case (next to top), blob for the false case (top of stack) | ||
| Line 455: | Line 455: | ||
| note: in contrast to Opcode 21 "Test for Small Int Zero", this opcode has undefined behaviour of the operand is not a small integer. | note: in contrast to Opcode 21 "Test for Small Int Zero", this opcode has undefined behaviour of the operand is not a small integer. | ||
| - | === Opcode 0x47 (71): Duplicate second-to-top === | + | === Opcode 0x47 (71): Duplicate second-to-top |
| effect: pushes a copy of the second-to-top (the third value if you call top-of-stack the first one) to the standard stack. | effect: pushes a copy of the second-to-top (the third value if you call top-of-stack the first one) to the standard stack. | ||
| PostScript equivalent: "2 index" | PostScript equivalent: "2 index" | ||
| - | === Opcode 0x48 (72): Duplicate third-to-top === | + | === Opcode 0x48 (72): Duplicate third-to-top |
| effect: pushes a copy of the third-to-top (the fourth value if you call top-of-stack the first one) to the standard stack. | effect: pushes a copy of the third-to-top (the fourth value if you call top-of-stack the first one) to the standard stack. | ||
| PostScript equivalent: "3 index" | PostScript equivalent: "3 index" | ||
| - | === Opcode 0x49 (73): Duplicate fourth-to-top === | + | === Opcode 0x49 (73): Duplicate fourth-to-top |
| effect: pushes a copy of the fourth-to-top (the 5th value if you call top-of-stack the first one) to the standard stack. | effect: pushes a copy of the fourth-to-top (the 5th value if you call top-of-stack the first one) to the standard stack. | ||
| PostScript equivalent: "4 index" | PostScript equivalent: "4 index" | ||
| - | === Opcode 0x4A (74): Duplicate 5th-to-top === | + | === Opcode 0x4A (74): Duplicate 5th-to-top |
| effect: pushes a copy of the 5th-to-top (the 6th value if you call top-of-stack the first one) to the standard stack. | effect: pushes a copy of the 5th-to-top (the 6th value if you call top-of-stack the first one) to the standard stack. | ||
| PostScript equivalent: "5 index" | PostScript equivalent: "5 index" | ||
| - | === Opcode 0x4B (75): Move Top-3 to top === | + | === Opcode 0x4B (75): Move Top-3 to top (rollin.5) |
| effect: The value at Top-3 gets moved to top of stack, top of stack becomes top-1 and so on. | effect: The value at Top-3 gets moved to top of stack, top of stack becomes top-1 and so on. | ||
| PostScript equivalent: "4 -1 roll" | PostScript equivalent: "4 -1 roll" | ||
| - | === Opcode 0x4C (76): Move Top-4 to top === | + | === Opcode 0x4C (76): Move Top-4 to top (rollin.4) |
| effect: The value at Top-4 gets moved to top of stack, top of stack becomes top-1 and so on. | effect: The value at Top-4 gets moved to top of stack, top of stack becomes top-1 and so on. | ||
| PostScript equivalent: "5 -1 roll" | PostScript equivalent: "5 -1 roll" | ||
| - | === Opcode 0x4D (77): Move Top-5 to top === | + | === Opcode 0x4D (77): Move Top-5 to top (rollin.3) |
| effect: The value at Top-5 gets moved to top of stack, top of stack becomes top-1 and so on. | effect: The value at Top-5 gets moved to top of stack, top of stack becomes top-1 and so on. | ||
| PostScript equivalent: "6 -1 roll" | PostScript equivalent: "6 -1 roll" | ||
| - | === Opcode 0x4E (78): Increment Small Int === | + | === Opcode 0x4E (78): Increment Small Int (inc.w) |
| stack input: smallint a | stack input: smallint a | ||
| stack ouput: smallint (a+1) | stack ouput: smallint (a+1) | ||
| - | === Opcode 0x4F (79): Decrement Small Int === | + | === Opcode 0x4F (79): Decrement Small Int (dec.w) |
| stack input: smallint a | stack input: smallint a | ||
ocmbytecode.txt · Last modified: 2023/04/23 15:05 by nopsled