From eca2f50b48a9941e2f3d2cd75fb699ace070f9cc Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Mon, 17 Jan 2022 00:07:33 +0100
Subject: [PATCH] Fix pivot offset calculation for negative incx

---
 lapack/laswp/generic/laswp_k_4.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lapack/laswp/generic/laswp_k_4.c b/lapack/laswp/generic/laswp_k_4.c
index 191a229a9..6520ed799 100644
--- a/lapack/laswp/generic/laswp_k_4.c
+++ b/lapack/laswp/generic/laswp_k_4.c
@@ -65,10 +65,9 @@ int CNAME(BLASLONG n, BLASLONG k1, BLASLONG k2, FLOAT dummy1, FLOAT *a, BLASLONG
   a--;
   k1 --;
 
-#ifndef MINUS
  ipiv += k1;
-#else
-  ipiv -= (k2 - 1) * incx;
+#ifdef MINUS
+  ipiv -= (k2 - k1 - 1) * incx;
 #endif
 
   if (n  <= 0) return 0;