Merge pull request #2898 from o1-labs/dw/addi-boundary-immediate

o1vm/riscv32im: add unit tests for addi with boundary values

o1vm/resources/programs/riscv32im/src/addi_boundary_immediate.S

@@ -0,0 +1,20 @@
+.section .text
+.globl _start
+
+_start:
+    li t0, 100            # t0 = 100
+    addi t1, t0, 2047     # t1 = t0 + 2047 (Expected: t1 = 2147)
+
+    li t2, 1000           # t2 = 1000
+    addi t3, t2, -2048    # t3 = t2 + (-2048) (Expected: t1 = -1048)
+
+    # Custom exit syscall
+    li a0, 0
+    li a1, 0
+    li a2, 0
+    li a3, 0
+    li a4, 0
+    li a5, 0
+    li a6, 0
+    li a7, 42
+    ecall

o1vm/tests/test_riscv_elf.rs

@@ -234,3 +234,20 @@ fn test_addi_overflow() {
     assert_eq!(witness.registers[T3], 2147483647);
     assert_eq!(witness.registers[T5], 123456789);
 }
+
+#[test]
+fn test_addi_boundary_immediate() {
+    let curr_dir = std::env::current_dir().unwrap();
+    let path = curr_dir.join(std::path::PathBuf::from(
+        "resources/programs/riscv32im/bin/addi_boundary_immediate",
+    ));
+    let state = o1vm::elf_loader::parse_riscv32(&path).unwrap();
+    let mut witness = Env::<Fp>::create(PAGE_SIZE.try_into().unwrap(), state);
+
+    while !witness.halt {
+        witness.step();
+    }
+
+    assert_eq!(witness.registers[T1], 2147);
+    assert_eq!(witness.registers[T3], (-1048_i32) as u32);
+}