diff options
| -rw-r--r-- | src/protected_mode/mod.rs | 15 | ||||
| -rw-r--r-- | src/real_mode/mod.rs | 15 |
2 files changed, 18 insertions, 12 deletions
diff --git a/src/protected_mode/mod.rs b/src/protected_mode/mod.rs index 5457b9d..71ddf37 100644 --- a/src/protected_mode/mod.rs +++ b/src/protected_mode/mod.rs @@ -6087,12 +6087,15 @@ fn read_M< #[inline] fn width_to_gp_reg_bank(width: u8) -> RegisterBank { - match width { - 1 => return RegisterBank::B, - 2 => return RegisterBank::W, - 4 => return RegisterBank::D, - _ => unsafe { unreachable_unchecked(); } - } + let index = width.trailing_zeros(); + + const BANK_LUT: [RegisterBank; 3] = [ + RegisterBank::B, + RegisterBank::W, + RegisterBank::D, + ]; + + *BANK_LUT.get(index as usize).unwrap_or_else(|| unsafe { unreachable_unchecked() }) } fn read_0f_opcode(opcode: u8, prefixes: &mut Prefixes) -> OpcodeRecord { diff --git a/src/real_mode/mod.rs b/src/real_mode/mod.rs index 8749ae2..bff00ad 100644 --- a/src/real_mode/mod.rs +++ b/src/real_mode/mod.rs @@ -6089,12 +6089,15 @@ fn read_M< #[inline] fn width_to_gp_reg_bank(width: u8) -> RegisterBank { - match width { - 1 => return RegisterBank::B, - 2 => return RegisterBank::W, - 4 => return RegisterBank::D, - _ => unsafe { unreachable_unchecked(); } - } + let index = width.trailing_zeros(); + + const BANK_LUT: [RegisterBank; 3] = [ + RegisterBank::B, + RegisterBank::W, + RegisterBank::D, + ]; + + *BANK_LUT.get(index as usize).unwrap_or_else(|| unsafe { unreachable_unchecked() }) } fn read_0f_opcode(opcode: u8, prefixes: &mut Prefixes) -> OpcodeRecord { |