add F extension

1 files changed, 90 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 4ccd0a1..9ec507b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,6 +17,7 @@ static MEMORY: LazyLock<Mutex<Box<[u8]>>> =
 struct CpuState<'a> {
     memory: &'a mut Box<[u8]>,
     registers: &'a mut [u32; 32],
+    f_registers: &'a mut [f32; 32],
     pc: &'a mut u32,
     reservations: &'a mut HashSet<usize>,
 }
@@ -43,6 +44,7 @@ fn main() {
     }
 
     let mut registers: [u32; 32] = [0; 32];
+    let mut f_registers: [f32; 32] = [0f32; 32];
     let mut pc: u32 = 0;
     let mut reservations: HashSet<usize> = HashSet::new();
 
@@ -64,6 +66,7 @@ fn main() {
             handle_instruction(CpuState {
                 memory: &mut *memory,
                 registers: &mut registers,
+                f_registers: &mut f_registers,
                 pc: &mut pc,
                 reservations: &mut reservations,
             });
@@ -75,6 +78,7 @@ fn handle_instruction(
     CpuState {
         memory,
         registers,
+        f_registers,
         pc,
         reservations,
     }: CpuState,
@@ -352,6 +356,92 @@ fn handle_instruction(
                 _ => panic!("Illegal instruction: {:x}", word),
             }
         }
+        0b1000011 => {
+            // todo: handle rm bit
+            let rd = ((word >> 7) & REGISTER_NAME_WIDTH) as usize;
+            let rs1 = ((word >> 15) & REGISTER_NAME_WIDTH) as usize;
+            let rs2 = ((word >> 20) & REGISTER_NAME_WIDTH) as usize;
+            let rs3 = ((word >> 27) & REGISTER_NAME_WIDTH) as usize;
+
+            fmadd_s(f_registers, rd, rs1, rs2, rs3);
+        }
+        0b1000111 => {
+            // todo: handle rm bit
+            let rd = ((word >> 7) & REGISTER_NAME_WIDTH) as usize;
+            let rs1 = ((word >> 15) & REGISTER_NAME_WIDTH) as usize;
+            let rs2 = ((word >> 20) & REGISTER_NAME_WIDTH) as usize;
+            let rs3 = ((word >> 27) & REGISTER_NAME_WIDTH) as usize;
+
+            fmsub_s(f_registers, rd, rs1, rs2, rs3);
+        }
+        0b1001011 => {
+            // todo: handle rm bit
+            let rd = ((word >> 7) & REGISTER_NAME_WIDTH) as usize;
+            let rs1 = ((word >> 15) & REGISTER_NAME_WIDTH) as usize;
+            let rs2 = ((word >> 20) & REGISTER_NAME_WIDTH) as usize;
+            let rs3 = ((word >> 27) & REGISTER_NAME_WIDTH) as usize;
+
+            fnmsub_s(f_registers, rd, rs1, rs2, rs3);
+        }
+        0b1001111 => {
+            // todo: handle rm bit
+            let rd = ((word >> 7) & REGISTER_NAME_WIDTH) as usize;
+            let rs1 = ((word >> 15) & REGISTER_NAME_WIDTH) as usize;
+            let rs2 = ((word >> 20) & REGISTER_NAME_WIDTH) as usize;
+            let rs3 = ((word >> 27) & REGISTER_NAME_WIDTH) as usize;
+
+            fnmadd_s(f_registers, rd, rs1, rs2, rs3);
+        }
+        0b1010011 => {
+            // todo: handle rm bit
+            let rd = ((word >> 7) & REGISTER_NAME_WIDTH) as usize;
+            let rs1 = ((word >> 15) & REGISTER_NAME_WIDTH) as usize;
+            let rs2 = ((word >> 20) & REGISTER_NAME_WIDTH) as usize;
+            let f5 = word >> 27;
+            let rm = (word >> 12) & 0b111;
+
+            match f5 {
+                0 => fadd_s(f_registers, rd, rs1, rs2),
+                1 => fsub_s(f_registers, rd, rs1, rs2),
+                2 => fmul_s(f_registers, rd, rs1, rs2),
+                3 => fdiv_s(f_registers, rd, rs1, rs2),
+                11 => fsqrt_s(f_registers, rd, rs1),
+                4 => match rm {
+                    0 => fsgnj_s(f_registers, rd, rs1, rs2),
+                    1 => fsgnjn_s(f_registers, rd, rs1, rs2),
+                    2 => fsgnjx_s(f_registers, rd, rs1, rs2),
+                    _ => panic!("Illegal instruction: {:x}", rm),
+                },
+                5 => match rm {
+                    0 => fmin_s(f_registers, rd, rs1, rs2),
+                    1 => fmax_s(f_registers, rd, rs1, rs2),
+                    _ => panic!("Illegal instruction: {:x}", rm),
+                },
+                24 => {
+                    fcvt_wu_s(registers, f_registers, rd, rs1);
+                }
+                28 => {
+                    match rm {
+                        0 => fmv_x_w(registers, f_registers, rd, rs1),
+                        1 => fclass_s(registers, f_registers, rd, rs1),
+                        _ => panic!("Illegal instruction: {:x}", rm),
+                    };
+                }
+                20 => match rm {
+                    0 => feq_s(registers, f_registers, rd, rs1, rs2),
+                    1 => flt_s(registers, f_registers, rd, rs1, rs2),
+                    2 => fle_s(registers, f_registers, rd, rs1, rs2),
+                    _ => panic!("Illegal instruction: {:x}", rm),
+                },
+
+                _ => panic!("Illegal instruction: {:x}", word),
+            }
+        }
+        0b1010101 => {
+            let rd = ((word >> 7) & REGISTER_NAME_WIDTH) as usize;
+            let rs1 = ((word >> 15) & REGISTER_NAME_WIDTH) as usize;
+            fcvt_w_s(registers, f_registers, rd, rs1);
+        }
         _ => panic!("Illegal instruction or todo: {:x}", word),
     }