From ec45d4d55c932af7a82cbb5ca7d6056d999fbf36 Mon Sep 17 00:00:00 2001
From: Vladimir Chalupecky <vladimir@chalupecky.dev>
Date: Thu, 13 Feb 2020 09:01:46 +0100
Subject: [PATCH] testlapack: simplify isSchurCanonical

---
 lapack/testlapack/general.go | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/lapack/testlapack/general.go b/lapack/testlapack/general.go
index 97e1beb4..d90063d0 100644
--- a/lapack/testlapack/general.go
+++ b/lapack/testlapack/general.go
@@ -1158,13 +1158,7 @@ func extract2x2Block(t []float64, ldt int) (a, b, c, d float64) {
 // isSchurCanonical returns whether the 2×2 matrix [a b; c d] is in Schur
 // canonical form.
 func isSchurCanonical(a, b, c, d float64) bool {
-	if c == 0 {
-		return true
-	}
-	if b == 0 || a != d || math.Signbit(b) == math.Signbit(c) {
-		return false
-	}
-	return true
+	return c == 0 || (b != 0 && a == d && math.Signbit(b) != math.Signbit(c))
 }
 
 // isSchurCanonicalGeneral returns whether T is block upper triangular with 1×1