use compiler intrinsics' assume

src/function_entry.rs

@@ -10,7 +10,10 @@ use egui::{
 };
 use epaint::Color32;
 use parsing::parsing::{process_func_str, BackingFunction};
-use std::fmt::{self, Debug};
+use std::{
+	fmt::{self, Debug},
+	intrinsics::assume,
+};
 
 #[cfg(threading)]
 use rayon::iter::ParallelIterator;
@@ -233,6 +236,8 @@ impl FunctionEntry {
 		let resolution: f64 = settings.plot_width as f64 / (max_x.abs() + min_x.abs());
 		let resolution_iter = resolution_helper(&settings.plot_width + 1, min_x, &resolution);
 
+		unsafe { assume(!resolution_iter.is_empty()) }
+
 		// Makes sure proper arguments are passed when integral is enabled
 		if self.integral && settings.integral_changed {
 			self.invalidate_integral();
@@ -330,6 +335,10 @@ impl FunctionEntry {
 					.collect();
 				debug_assert_eq!(data.len(), settings.plot_width + 1);
 				self.derivative_data = data;
+
+				unsafe {
+					assume(!self.derivative_data.is_empty());
+				}
 			}
 
 			if self.nth_derviative && self.nth_derivative_data.is_none() {
@@ -338,6 +347,10 @@ impl FunctionEntry {
 					.collect();
 				debug_assert_eq!(data.len(), settings.plot_width + 1);
 				self.nth_derivative_data = Some(data);
+
+				unsafe {
+					assume(self.nth_derivative_data.is_some());
+				}
 			}
 		}
 
@@ -351,6 +364,9 @@ impl FunctionEntry {
 				);
 				self.integral_data =
 					Some((data.iter().map(|(x, y)| Bar::new(*x, *y)).collect(), area));
+				unsafe {
+					assume(self.integral_data.is_some());
+				}
 			}
 		} else {
 			self.invalidate_integral();

src/lib.rs

@@ -2,6 +2,7 @@
 #![feature(let_chains)]
 #![feature(stmt_expr_attributes)]
 #![feature(const_trait_impl)]
+#![feature(core_intrinsics)]
 
 #[macro_use]
 extern crate static_assertions;

src/main.rs

@@ -2,6 +2,7 @@
 #![feature(let_chains)]
 #![feature(stmt_expr_attributes)]
 #![feature(const_trait_impl)]
+#![feature(core_intrinsics)]
 
 #[macro_use]
 extern crate static_assertions;

src/widgets.rs

@@ -1,3 +1,5 @@
+use std::intrinsics::assume;
+
 use egui::{text::CCursor, text_edit::CursorRange, TextEdit};
 use epaint::text::cursor::{Cursor, PCursor, RCursor};
 use parsing::suggestions::{self, generate_hint, Hint};
@@ -52,6 +54,12 @@ impl<'a> AutoComplete<'a> {
 
 		match self.hint {
 			Hint::Many(hints) => {
+				// Impossible for plural hints to be singular or non-existant
+				unsafe {
+					assume(hints.len() > 1);
+					assume(!hints.is_empty());
+				}
+
 				match movement {
 					Movement::Up => {
 						// subtract one, if fail, set to maximum index value.
@@ -65,6 +73,8 @@ impl<'a> AutoComplete<'a> {
 						}
 					}
 					Movement::Complete => {
+						unsafe { assume(hints.len() >= (self.i + 1)) }
+
 						self.apply_hint(hints[self.i]);
 					}
 					Movement::None => {}
@@ -87,7 +97,7 @@ impl<'a> AutoComplete<'a> {
 
 /// Moves cursor of TextEdit `te_id` to the end
 pub fn move_cursor_to_end(ctx: &egui::Context, te_id: egui::Id) {
-	let mut state = TextEdit::load_state(ctx, te_id).expect("Expected TextEdit");
+	let mut state = unsafe { TextEdit::load_state(ctx, te_id).unwrap_unchecked() };
 	state.set_cursor_range(Some(CursorRange::one(Cursor {
 		ccursor: CCursor {
 			index: 0,