From cf71a97881e170fa018bf5fd0f02cdb13b874af8 Mon Sep 17 00:00:00 2001 From: sanine Date: Tue, 23 May 2023 00:29:12 -0500 Subject: implement SUB --- src/vm/instruction.js | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'src/vm/instruction.js') diff --git a/src/vm/instruction.js b/src/vm/instruction.js index c9048e1..146a88b 100644 --- a/src/vm/instruction.js +++ b/src/vm/instruction.js @@ -37,3 +37,18 @@ exports.ADD = function(core, pc, ins) { return [pc + 1]; } + + +exports.SUB = function(core, pc, ins) { + if (ins.a.mode === AddrMode.Immediate) { + const dst = core.getValue(pc, ins.b); + dst.b.value -= ins.a.value; + } else { + const src = core.getValue(pc, ins.a); + const dst = core.getValue(pc, ins.b); + dst.a.value -= src.a.value; + dst.b.value -= src.b.value; + } + + return [pc + 1]; +} -- cgit v1.2.1