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fix(cpu): account for overflow in THUMB alu MUL

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-02-02 18:57:33 -04:00
parent 045c98de1f
commit 784bc81a4a
1 changed files with 2 additions and 1 deletions
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3
src/cpu/thumb/format4.zig
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@ -90,7 +90,8 @@ pub fn format4(comptime op: u4) InstrFn {
}, },
0xD => { 0xD => {
// MUL // MUL
const result = cpu.r[rs] * cpu.r[rd]; const temp = @as(u64, cpu.r[rs]) * @as(u64, cpu.r[rd]);
const result = @truncate(u32, temp);
cpu.r[rd] = result; cpu.r[rd] = result;
cpu.cpsr.n.write(result >> 31 & 1 == 1); cpu.cpsr.n.write(result >> 31 & 1 == 1);