From 3b6293f5a0e4371d81074ee0ebc19d173ca696ed Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Mon, 17 Jan 2022 00:09:14 +0100
Subject: [PATCH] Fix offset calculation for negative incx

---
 lapack/laswp/generic/zlaswp_k_1.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lapack/laswp/generic/zlaswp_k_1.c b/lapack/laswp/generic/zlaswp_k_1.c
index d1204778a..42aaed528 100644
--- a/lapack/laswp/generic/zlaswp_k_1.c
+++ b/lapack/laswp/generic/zlaswp_k_1.c
@@ -59,10 +59,9 @@ int CNAME(BLASLONG n, BLASLONG k1, BLASLONG k2, FLOAT dummy1, FLOAT dummy4,
   lda *= 2;
   k1 --;
 
-#ifndef MINUS
  ipiv += k1;
-#else
-  ipiv -= (k2 - 1) * incx;
+#ifdef MINUS
+  ipiv -= (k2 - k1 - 1) * incx;
 #endif
 
   if (n  <= 0) return 0;