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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/barrel_shifter.zig
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@@ -3,6 +3,8 @@ const std = @import("std");
const Arm7tdmi = @import("../cpu.zig").Arm7tdmi;
const CPSR = @import("../cpu.zig").PSR;
const rotr = @import("../util.zig").rotr;
pub fn execute(comptime S: bool, cpu: *Arm7tdmi, opcode: u32) u32 {
var result: u32 = undefined;
if (opcode >> 4 & 1 == 1) {
@@ -141,7 +143,7 @@ pub fn arithmeticRight(comptime S: bool, cpsr: *CPSR, rm: u32, total_amount: u8)
}
pub fn rotateRight(comptime S: bool, cpsr: *CPSR, rm: u32, total_amount: u8) u32 {
const result = std.math.rotr(u32, rm, total_amount);
const result = rotr(u32, rm, total_amount);
if (S and total_amount != 0) {
cpsr.c.write(result >> 31 & 1 == 1);