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chore: replace unnecessarily complex sign extension implementation

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-02-28 20:38:50 -04:00
parent ddb68a7952
commit cb4d3a9a51
6 changed files with 19 additions and 41 deletions
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4
src/cpu/arm/branch.zig
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@@ -4,13 +4,13 @@ const Bus = @import("../../Bus.zig");
const Arm7tdmi = @import("../../cpu.zig").Arm7tdmi;
const InstrFn = @import("../../cpu.zig").ArmInstrFn;
const u32SignExtend = @import("../../util.zig").u32SignExtend;
const sext = @import("../../util.zig").sext;
pub fn branch(comptime L: bool) InstrFn {
return struct {
fn inner(cpu: *Arm7tdmi, _: *Bus, opcode: u32) void {
if (L) cpu.r[14] = cpu.r[15];
cpu.r[15] = cpu.fakePC() +% u32SignExtend(24, opcode << 2);
cpu.r[15] = cpu.fakePC() +% sext(24, opcode << 2);
}
}.inner;
}