From f0b70fe1774a0da0cd6148fb28b933d6dfb122f8 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Mon, 18 Mar 2024 22:58:34 +0100
Subject: asm: add cmovnz/cmovz instructions

---
 src/insn.rs        | 16 ++++++++++++++++
 src/insn/cmovnz.rs |  8 ++++++++
 src/insn/cmovz.rs  |  8 ++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 src/insn/cmovnz.rs
 create mode 100644 src/insn/cmovz.rs

(limited to 'src')

diff --git a/src/insn.rs b/src/insn.rs
index 60004d2..c02206c 100644
--- a/src/insn.rs
+++ b/src/insn.rs
@@ -2,6 +2,8 @@
 
 mod add;
 mod call;
+mod cmovnz;
+mod cmovz;
 mod cmp;
 mod dec;
 mod jmp;
@@ -26,6 +28,20 @@ pub trait Call<T> {
     fn call(&mut self, op1: T);
 }
 
+pub trait Cmovnz<T, U> {
+    /// Emit a (conditional) move if not zero instruction.
+    ///
+    /// Move is only commited if (ZF=0).
+    fn cmovnz(&mut self, op1: T, op2: U);
+}
+
+pub trait Cmovz<T, U> {
+    /// Emit a (conditional) move if zero instruction.
+    ///
+    /// Move is only commited if (ZF=1).
+    fn cmovz(&mut self, op1: T, op2: U);
+}
+
 /// Trait for [`cmp`](https://www.felixcloutier.com/x86/cmp) instruction kinds.
 pub trait Cmp<T, U> {
     /// Emit a compare instruction.
diff --git a/src/insn/cmovnz.rs b/src/insn/cmovnz.rs
new file mode 100644
index 0000000..3e7f21c
--- /dev/null
+++ b/src/insn/cmovnz.rs
@@ -0,0 +1,8 @@
+use super::Cmovnz;
+use crate::{Asm, Reg64};
+
+impl Cmovnz<Reg64, Reg64> for Asm {
+    fn cmovnz(&mut self, op1: Reg64, op2: Reg64) {
+        self.encode_rr(&[0x0f, 0x45], op2, op1);
+    }
+}
diff --git a/src/insn/cmovz.rs b/src/insn/cmovz.rs
new file mode 100644
index 0000000..c49aa35
--- /dev/null
+++ b/src/insn/cmovz.rs
@@ -0,0 +1,8 @@
+use super::Cmovz;
+use crate::{Asm, Reg64};
+
+impl Cmovz<Reg64, Reg64> for Asm {
+    fn cmovz(&mut self, op1: Reg64, op2: Reg64) {
+        self.encode_rr(&[0x0f, 0x44], op2, op1);
+    }
+}
-- 
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