Fix lack of sign extend for MUL

This FINALLY fixes Vertical Force :D
emu-rs · Feb 13, 2017 · 09cb078 · 09cb078
1 parent 34f11cd
commit 09cb078
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/rustual-boy-core/src/v810.rs b/rustual-boy-core/src/v810.rs
@@ -396,8 +396,8 @@ impl V810 {
                     self.set_reg_gpr(reg2, res);
                 }),
                 OPCODE_BITS_MUL => format_i!(|reg1, reg2| {
-                    let lhs = self.reg_gpr(reg2) as i64;
-                    let rhs = self.reg_gpr(reg1) as i64;
+                    let lhs = (self.reg_gpr(reg2) as i32) as i64;
+                    let rhs = (self.reg_gpr(reg1) as i32) as i64;
                     let res = (lhs * rhs) as u64;
                     let res_low = res as u32;
                     let res_high = (res >> 32) as u32;