From 0201524c527f18e21240dce682dfe725b08cfb12 Mon Sep 17 00:00:00 2001
From: Michael Munday <mndygolang+git@gmail.com>
Date: Fri, 1 Aug 2025 01:53:54 +0100
Subject: [PATCH] math: remove redundant infinity tests

These cases are covered by existing comparisons against constants.

Change-Id: I19ad530e95d2437a8617f5229495da591ceb779a
Reviewed-on: https://go-review.googlesource.com/c/go/+/692255
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Sean Liao <sean@liao.dev>
---
 src/math/exp.go | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/src/math/exp.go b/src/math/exp.go
index 050e0ee9d8..029a4f8163 100644
--- a/src/math/exp.go
+++ b/src/math/exp.go
@@ -109,13 +109,11 @@ func exp(x float64) float64 {
 
 	// special cases
 	switch {
-	case IsNaN(x) || IsInf(x, 1):
+	case IsNaN(x):
 		return x
-	case IsInf(x, -1):
-		return 0
-	case x > Overflow:
+	case x > Overflow: // handles case where x is +∞
 		return Inf(1)
-	case x < Underflow:
+	case x < Underflow: // handles case where x is -∞
 		return 0
 	case -NearZero < x && x < NearZero:
 		return 1 + x
@@ -157,13 +155,11 @@ func exp2(x float64) float64 {
 
 	// special cases
 	switch {
-	case IsNaN(x) || IsInf(x, 1):
+	case IsNaN(x):
 		return x
-	case IsInf(x, -1):
-		return 0
-	case x > Overflow:
+	case x > Overflow: // handles case where x is +∞
 		return Inf(1)
-	case x < Underflow:
+	case x < Underflow: // handles case where x is -∞
 		return 0
 	}
 
-- 
2.51.0