diff options
Diffstat (limited to 'src/vm/instruction.test.js')
| -rw-r--r-- | src/vm/instruction.test.js | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/src/vm/instruction.test.js b/src/vm/instruction.test.js index fd402e4..7bd2068 100644 --- a/src/vm/instruction.test.js +++ b/src/vm/instruction.test.js @@ -1,7 +1,7 @@ 'use strict'; const { Core } = require('./core.js'); -const { DAT, MOV, ADD } = require('./instruction.js'); +const { DAT, MOV, ADD, SUB } = require('./instruction.js'); const CORESIZE = 8000; @@ -175,3 +175,71 @@ test('ADD correctly adds B-field', () => { b: { mode: 'immediate', value: 5 }, }); }); + + +test('SUB correctly subtracts two full instructions', () => { + const core = new Core(CORESIZE); + const pc = 20; + core.data[pc] = { + opcode: 'SUB', + a: { mode: 'direct', value: 1 }, + b: { mode: 'direct', value: 2 }, + }; + core.data[pc+1] = { + opcode: 'DAT', + a: { mode: 'immediate', value: 10 }, + b: { mode: 'immediate', value: 20 }, + }; + core.data[pc+2] = { + opcode: 'DAT', + a: { mode: 'immediate', value: 3 }, + b: { mode: 'immediate', value: 4 }, + }; + const ins = core.data[pc]; + + expect(SUB(core, pc, ins)).toEqual([pc+1]); + expect(core.data[pc+1]).toEqual({ + opcode: 'DAT', + a: { mode: 'immediate', value: 10 }, + b: { mode: 'immediate', value: 20 }, + }); + expect(core.data[pc+2]).toEqual({ + opcode: 'DAT', + a: { mode: 'immediate', value: -7 }, + b: { mode: 'immediate', value: -16 }, + }); +}); + + +test('SUB correctly subtracts B-field', () => { + const core = new Core(CORESIZE); + const pc = 20; + core.data[pc] = { + opcode: 'SUB', + a: { mode: 'immediate', value: 1 }, + b: { mode: 'direct', value: 2 }, + }; + core.data[pc+1] = { + opcode: 'DAT', + a: { mode: 'immediate', value: 10 }, + b: { mode: 'immediate', value: 20 }, + }; + core.data[pc+2] = { + opcode: 'DAT', + a: { mode: 'immediate', value: 3 }, + b: { mode: 'immediate', value: 4 }, + }; + const ins = core.data[pc]; + + expect(SUB(core, pc, ins)).toEqual([pc+1]); + expect(core.data[pc+1]).toEqual({ + opcode: 'DAT', + a: { mode: 'immediate', value: 10 }, + b: { mode: 'immediate', value: 20 }, + }); + expect(core.data[pc+2]).toEqual({ + opcode: 'DAT', + a: { mode: 'immediate', value: 3 }, + b: { mode: 'immediate', value: 3 }, + }); +}); |