Rename constexpr exp to expi

2 files changed, 12 insertions, 12 deletions

diff --git a/utils.h b/utils.h
index 86d633b..2927693 100644
--- a/utils.h
+++ b/utils.h
@@ -57,16 +57,16 @@ constexpr unsigned long long factorial(unsigned n) {
 }
 
 /*
- * e^x
+ * e^n, where n is integer
  */
 namespace { // anonymous namespace
-constexpr double exp_nonnegative(unsigned x) {
-  return x == 0 ? 1.0 : (x == 1 ? 2.718281828459045 : exp_nonnegative(x / 2) * exp_nonnegative((x + 1) / 2));
+constexpr double expi_nonnegative(unsigned n) {
+  return n == 0 ? 1.0 : (n == 1 ? 2.718281828459045 : expi_nonnegative(n / 2) * expi_nonnegative((n + 1) / 2));
 }
 } // anonymous namespace
 
-constexpr double exp(int x) {
-  return (x >= 0 ? exp_nonnegative(x) : 1.0 / exp_nonnegative(-x));
+constexpr double expi(int n) {
+  return (n >= 0 ? expi_nonnegative(n) : 1.0 / expi_nonnegative(-n));
 }
 
 }
diff --git a/vec_utils.h b/vec_utils.h
index 0d2b298..b46aa90 100644
--- a/vec_utils.h
+++ b/vec_utils.h
@@ -75,13 +75,13 @@ Register exp_approx_taylor(Register x) {
   static constexpr int EXP_MIN = -20;
   static constexpr int EXP_MAX = 20;
   static constexpr float EXP_LOOKUP[EXP_MAX - EXP_MIN + 1] = {
-    exp(-20), exp(-19), exp(-18), exp(-17), exp(-16), exp(-15),
-    exp(-14), exp(-13), exp(-12), exp(-11), exp(-10), exp(-9),
-    exp(-8), exp(-7), exp(-6), exp(-5), exp(-4), exp(-3), exp(-2),
-    exp(-1), exp(0), exp(1), exp(2), exp(3), exp(4), exp(5),
-    exp(6), exp(7), exp(8), exp(9), exp(10), exp(11), exp(12),
-    exp(13), exp(14), exp(15), exp(16), exp(17), exp(18), exp(19),
-    exp(20),
+    expi(-20), expi(-19), expi(-18), expi(-17), expi(-16), expi(-15),
+    expi(-14), expi(-13), expi(-12), expi(-11), expi(-10), expi(-9),
+    expi(-8), expi(-7), expi(-6), expi(-5), expi(-4), expi(-3), expi(-2),
+    expi(-1), expi(0), expi(1), expi(2), expi(3), expi(4), expi(5),
+    expi(6), expi(7), expi(8), expi(9), expi(10), expi(11), expi(12),
+    expi(13), expi(14), expi(15), expi(16), expi(17), expi(18), expi(19),
+    expi(20),
   };
 
   static const Register dividers[] = {