From: makise-homura <akemi_homura@kurisa.ch>
Date: Wed, 14 Jul 2021 17:00:44 +0000 (+0300)
Subject: Clarify no-tree-vectorize usage for ICC and LCC
X-Git-Tag: v1.5.1~1^2~136^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F2725%2Fhead;p=thirdparty%2Fzstd.git

Clarify no-tree-vectorize usage for ICC and LCC
---

diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index a01c30cc1..012ff0221 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -150,7 +150,8 @@
 }
 
 /* vectorization
- * older GCC (pre gcc-4.3 picked as the cutoff) uses a different syntax */
+ * older GCC (pre gcc-4.3 picked as the cutoff) uses a different syntax,
+ * and some compilers, like Intel ICC and MCST LCC, do not support it at all. */
 #if !defined(__INTEL_COMPILER) && !defined(__clang__) && defined(__GNUC__) && !defined(__LCC__)
 #  if (__GNUC__ == 4 && __GNUC_MINOR__ > 3) || (__GNUC__ >= 5)
 #    define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize")))