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fix: improve perf of instructions w/ rotr

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-03-16 22:28:24 -03:00
parent 1921218c7b
commit 39ab363afa
7 changed files with 33 additions and 13 deletions
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4
src/cpu/arm/single_data_transfer.zig
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@@ -6,6 +6,8 @@ const Bus = @import("../../Bus.zig");
const Arm7tdmi = @import("../../cpu.zig").Arm7tdmi;
const InstrFn = @import("../../cpu.zig").ArmInstrFn;
const rotr = @import("../../util.zig").rotr;
pub fn singleDataTransfer(comptime I: bool, comptime P: bool, comptime U: bool, comptime B: bool, comptime W: bool, comptime L: bool) InstrFn {
return struct {
fn inner(cpu: *Arm7tdmi, bus: *Bus, opcode: u32) void {
@@ -33,7 +35,7 @@ pub fn singleDataTransfer(comptime I: bool, comptime P: bool, comptime U: bool,
} else {
// LDR
const value = bus.read32(address & 0xFFFF_FFFC);
result = std.math.rotr(u32, value, 8 * (address & 0x3));
result = rotr(u32, value, 8 * (address & 0x3));
}
} else {
if (B) {