From 03986f88a34e40b52ec712b4cdc1139861229be4 Mon Sep 17 00:00:00 2001
From: Zachary Levy <zachary@sunforge.is>
Date: Sun, 29 Mar 2026 20:24:11 -0700
Subject: [PATCH] Replaced our LN_2 constant with Odin core math.LN2

---
 levmath/levmath.odin | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/levmath/levmath.odin b/levmath/levmath.odin
index cbd6de3..185c1cc 100644
--- a/levmath/levmath.odin
+++ b/levmath/levmath.odin
@@ -34,14 +34,13 @@ import "core:testing"
 //   Neural Computation 11, 853–862 (1999).
 //   J. Rade, FastExp.h (2021), https://gist.github.com/jrade/293a73f89dfef51da6522428c857802d
 fast_exp :: #force_inline proc "contextless" (x: $FLOAT) -> FLOAT where intrinsics.type_is_float(FLOAT) {
-	LN_2 :: 0.6931471805599453
 	CORRECTION :: 0.04367744890362246
 
 	when FLOAT == f16 {
 		MANTISSA_BITS :: 10
 		EXPONENT_BIAS :: 15
 		SHIFT :: f16(1 << MANTISSA_BITS)
-		SCALE :: SHIFT / LN_2
+		SCALE :: SHIFT / math.LN2
 		BIAS  :: SHIFT * f16(EXPONENT_BIAS - CORRECTION)
 		MAX_Y :: SHIFT * (2 * EXPONENT_BIAS + 1)
 
@@ -52,7 +51,7 @@ fast_exp :: #force_inline proc "contextless" (x: $FLOAT) -> FLOAT where intrinsi
 		MANTISSA_BITS :: 23
 		EXPONENT_BIAS :: 127
 		SHIFT :: f32(1 << MANTISSA_BITS)
-		SCALE :: SHIFT / LN_2
+		SCALE :: SHIFT / math.LN2
 		BIAS  :: SHIFT * f32(EXPONENT_BIAS - CORRECTION)
 		MAX_Y :: SHIFT * (2 * EXPONENT_BIAS + 1)
 
@@ -63,7 +62,7 @@ fast_exp :: #force_inline proc "contextless" (x: $FLOAT) -> FLOAT where intrinsi
 		MANTISSA_BITS :: 52
 		EXPONENT_BIAS :: 1023
 		SHIFT :: f64(1 << MANTISSA_BITS)
-		SCALE :: SHIFT / LN_2
+		SCALE :: SHIFT / math.LN2
 		BIAS  :: SHIFT * f64(EXPONENT_BIAS - CORRECTION)
 		MAX_Y :: SHIFT * (2 * EXPONENT_BIAS + 1)