From 4b358f9b7348c50321f3ec1af6d56fa200c0889a Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Mon, 8 Jan 2024 10:48:19 +0100
Subject: [PATCH] Clarify -mmovbe documentation
It was noticed that -mmovbe doesn't use movbe for __builtin_bswap{32,64}
when not optimizing. The follownig adjusts the documentation to
say it will be used for optimizing and applies to all byte swaps,
not just those carried out via builtin function calls.
* doc/invoke.texi (-mmovbe): Clarify.
---
gcc/doc/invoke.texi | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 68d1f364ac05..8cf99f395a54 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -34708,8 +34708,8 @@ see @ref{Other Builtins} for details.
@opindex mmovbe
@item -mmovbe
-This option enables use of the @code{movbe} instruction to implement
-@code{__builtin_bswap32} and @code{__builtin_bswap64}.
+This option enables use of the @code{movbe} instruction to optimize
+byte swapping of four and eight byte entities.
@opindex mshstk
@item -mshstk
--
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