math: Add f64 powf and powi

Author: joncinque

libraries/math/src/instruction.rs

@@ -70,6 +70,15 @@ pub enum MathInstruction {
         /// The divisor
         divisor: f32,
     },
+    /// Pow two float values
+    ///
+    /// No accounts required for this instruction
+    F64Pow {
+        /// The base
+        base: f64,
+        /// The exponent
+        exponent: f64,
+    },
     /// Don't do anything for comparison
     ///
     /// No accounts required for this instruction
@@ -159,6 +168,17 @@ pub fn f32_divide(dividend: f32, divisor: f32) -> Instruction {
     }
 }
 
+/// Create F64Pow instruction
+pub fn f64_pow(base: f64, exponent: f64) -> Instruction {
+    Instruction {
+        program_id: id(),
+        accounts: vec![],
+        data: MathInstruction::F64Pow { base, exponent }
+            .try_to_vec()
+            .unwrap(),
+    }
+}
+
 /// Create PreciseSquareRoot instruction
 pub fn noop() -> Instruction {
     Instruction {

libraries/math/src/processor.rs

@@ -104,6 +104,15 @@ pub fn process_instruction(
             msg!("{}", result as u64);
             Ok(())
         }
+        MathInstruction::F64Pow { base, exponent } => {
+            msg!("Calculating f64 Pow");
+            sol_log_compute_units();
+            let _result = base.powi(5); // ok
+            let result = base.powf(exponent); // symbol not found
+            sol_log_compute_units();
+            msg!("{}", result as u64);
+            Ok(())
+        }
         MathInstruction::Noop => {
             msg!("Do nothing");
             msg!("{}", 0_u64);

libraries/math/tests/instruction_count.rs

@@ -148,6 +148,22 @@ async fn test_f32_divide() {
     banks_client.process_transaction(transaction).await.unwrap();
 }
 
+#[tokio::test]
+async fn test_f64_pow() {
+    let mut pc = ProgramTest::new("spl_math", id(), processor!(process_instruction));
+
+    pc.set_bpf_compute_max_units(30_000);
+
+    let (mut banks_client, payer, recent_blockhash) = pc.start().await;
+
+    let mut transaction = Transaction::new_with_payer(
+        &[instruction::f64_pow(50_f64, 10.5_f64)],
+        Some(&payer.pubkey()),
+    );
+    transaction.sign(&[&payer], recent_blockhash);
+    banks_client.process_transaction(transaction).await.unwrap();
+}
+
 #[tokio::test]
 async fn test_noop() {
     let mut pc = ProgramTest::new("spl_math", id(), processor!(process_instruction));