From: Michael Munday <mndygolang+git@gmail.com>
Date: Fri, 1 Aug 2025 00:53:54 +0000 (+0100)
Subject: math: remove redundant infinity tests
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=0201524c527f18e21240dce682dfe725b08cfb12;p=gostls13.git

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>
---

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
 	}