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//! Metal-based GPU acceleration for macOS
//!
//! This module provides GPU acceleration using Apple's Metal API
//! for quantum circuit simulation on macOS devices.
//!
//! TODO: Implement using Metal Performance Shaders (MPS) and Metal Compute Shaders
//!
//! Key components to implement:
//! - State vector allocation using Metal buffers
//! - Quantum gate kernels using Metal shaders
//! - Memory management for unified memory architecture
//! - Optimizations for Apple Silicon (M1/M2/M3)
use crate::error::{Result, SimulatorError};
use quantrs2_circuit::prelude::Circuit;
use quantrs2_core::prelude::QubitId;
use std::sync::Arc;
/// Metal-based GPU simulator for macOS
pub struct MetalGpuSimulator {
/// Number of qubits
num_qubits: usize,
/// Metal device handle (placeholder)
_device: Arc<()>,
}
impl MetalGpuSimulator {
/// Create a new Metal GPU simulator
pub fn new(num_qubits: usize) -> Result<Self> {
// TODO: Initialize Metal device
// TODO: Check for Metal support
// TODO: Create command queue
Err(SimulatorError::GpuError(
"Metal GPU support not yet implemented. Please use CPU simulation on macOS for now."
.to_string(),
))
}
/// Simulate a quantum circuit
pub fn simulate<const N: usize>(&mut self, _circuit: &Circuit<N>) -> Result<()> {
Err(SimulatorError::GpuError(
"Metal GPU simulation not yet implemented".to_string(),
))
}
/// Get available Metal devices
pub const fn available_devices() -> Vec<String> {
// TODO: Query Metal devices
// - Apple Silicon GPU
// - Intel integrated GPU
// - AMD Radeon GPU
vec![]
}
/// Check if Metal is available on this system
pub const fn is_available() -> bool {
// TODO: Check for Metal framework availability
false
}
}
/// Metal GPU backend interface (placeholder for future implementation)
pub trait MetalBackend {
/// Allocate state vector on GPU
fn allocate_state_vector(&self, size: usize) -> Result<()>;
/// Apply quantum gate
fn apply_gate(&self, gate: &str, qubits: &[QubitId]) -> Result<()>;
/// Transfer data between CPU and GPU
fn sync(&self) -> Result<()>;
}