From cc4166a814624585b30aeafd80511c63588200bc Mon Sep 17 00:00:00 2001
From: VegOwOtenks <vegowotenks@jossco.de>
Date: Wed, 11 Sep 2024 00:26:54 +0200
Subject: [PATCH] Implement BranchNegative

---
 src/jvm.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/jvm.rs b/src/jvm.rs
index 06a3e3e..1879548 100644
--- a/src/jvm.rs
+++ b/src/jvm.rs
@@ -765,6 +765,15 @@ impl JVM {
                     }
                 }
 
+                Instruction::BranchNegative(branch_offset) => {
+                    let test_value = wrap_stackframe_error(class, method, frame.operand_stack.pop_int(0))?;
+
+                    if test_value < 0 {
+                        frame.instruction_pointer -= offset as u32;
+                        frame.instruction_pointer = if branch_offset < 0 { frame.instruction_pointer - branch_offset.abs() as u32} else { frame.instruction_pointer + branch_offset.abs() as u32};
+                    }
+                }
+
                 Instruction::BranchNonNull(branch_offset) => {
                     let test_value = wrap_stackframe_error(class, method, frame.operand_stack.pop_reference(0))?;