bf: add runtime check for data ptr over/underflow

Fix bug to properly save callee-saved registers on jit entry and
restore registers on jit exit.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/insn/cmp.rs b/src/insn/cmp.rs
index 2d6f48b..57e53eb 100644
--- a/src/insn/cmp.rs
+++ b/src/insn/cmp.rs
@@ -1,5 +1,5 @@
 use super::Cmp;
-use crate::{Asm, Imm16, Imm8, Mem16, Mem8};
+use crate::{Asm, Imm16, Imm8, Mem16, Mem8, Reg64};
 
 impl Cmp<Mem8, Imm8> for Asm {
     fn cmp(&mut self, op1: Mem8, op2: Imm8) {
@@ -12,3 +12,9 @@ impl Cmp<Mem16, Imm16> for Asm {
         self.encode_mi(0x81, 0x7, op1, op2);
     }
 }
+
+impl Cmp<Reg64, Reg64> for Asm {
+    fn cmp(&mut self, op1: Reg64, op2: Reg64) {
+        self.encode_rr(&[0x3b], op1, op2);
+    }
+}