From: Wayne Davison <wayne@opencoder.net>
Date: Sun, 21 Jun 2020 15:05:19 +0000 (-0700)
Subject: Add -fno-slp-vectorize to clang++.
X-Git-Tag: v3.2.1pre1~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e95ba87878dc053355ef3829aa20a24060cd4f6;p=thirdparty%2Frsync.git

Add -fno-slp-vectorize to clang++.
---

diff --git a/configure.ac b/configure.ac
index cc6769ab..d8bc1013 100644
--- a/configure.ac
+++ b/configure.ac
@@ -249,6 +249,9 @@ if test x"$SIMD" != x""; then
     SIMD='$(SIMD_'"$SIMD)"
     # We only use c++ for its target attribute dispatching, disable unneeded bulky features
     CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-rtti"
+    case "$CXX" in
+    *clang*) CXXFLAGS="$CXXFLAGS -fno-slp-vectorize" ;; # avoid a performance hit
+    esac
 else
     AC_MSG_RESULT(no)
 fi