ocmbytecode
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision | ||
| ocmbytecode [2023/04/23 14:52] – [Opcodes 30..3F] nopsled | ocmbytecode [2023/04/23 14:55] – [Opcodes 40..4F] nopsled | ||
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| 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