19 lines
570 B
Zig
19 lines
570 B
Zig
const util = @import("../util.zig");
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const Bus = @import("../Bus.zig");
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const Arm7tdmi = @import("../cpu.zig").Arm7tdmi;
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const InstrFn = @import("../cpu.zig").InstrFn;
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pub fn branch(comptime L: bool) InstrFn {
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return struct {
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fn inner(cpu: *Arm7tdmi, _: *Bus, opcode: u32) void {
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if (L) {
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// TODO: Debugging beeg.gba w/ MGBA seems to suggest that I don't do anything here
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cpu.r[14] = cpu.r[15];
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}
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cpu.r[15] = cpu.fakePC() +% util.u32SignExtend(24, opcode << 2);
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}
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}.inner;
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}
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