aarch64: Fix incorrect LS64 documentation

As Yuta Mukai pointed out, the manual wrongly said that LS64 is
enabled by default for Armv8.7-A and above, and for Armv9.2-A
and above.  LS64 is not mandatory at any architecture level
(and the code correctly implemented that).

I think this was a leftover from an early version of the spec.

gcc/
	* doc/invoke.texi: Fix documentation of LS64 so that it's
	not implied by Armv8.7-A or Armv9.2-A.

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 28ef2cde43d3046c9322ccb30738b1506622e9e9..7146163d66d068522f5aa19f59badc1b05d05114 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -21443,12 +21443,12 @@ and the features that they enable by default:
 @item @samp{armv8.4-a} @tab Armv8.4-A @tab @samp{armv8.3-a}, @samp{+flagm}, @samp{+fp16fml}, @samp{+dotprod}
 @item @samp{armv8.5-a} @tab Armv8.5-A @tab @samp{armv8.4-a}, @samp{+sb}, @samp{+ssbs}, @samp{+predres}
 @item @samp{armv8.6-a} @tab Armv8.6-A @tab @samp{armv8.5-a}, @samp{+bf16}, @samp{+i8mm}
-@item @samp{armv8.7-a} @tab Armv8.7-A @tab @samp{armv8.6-a}, @samp{+ls64}
+@item @samp{armv8.7-a} @tab Armv8.7-A @tab @samp{armv8.6-a}
 @item @samp{armv8.8-a} @tab Armv8.8-a @tab @samp{armv8.7-a}, @samp{+mops}
 @item @samp{armv8.9-a} @tab Armv8.9-a @tab @samp{armv8.8-a}
 @item @samp{armv9-a} @tab Armv9-A @tab @samp{armv8.5-a}, @samp{+sve}, @samp{+sve2}
 @item @samp{armv9.1-a} @tab Armv9.1-A @tab @samp{armv9-a}, @samp{+bf16}, @samp{+i8mm}
-@item @samp{armv9.2-a} @tab Armv9.2-A @tab @samp{armv9.1-a}, @samp{+ls64}
+@item @samp{armv9.2-a} @tab Armv9.2-A @tab @samp{armv9.1-a}
 @item @samp{armv9.3-a} @tab Armv9.3-A @tab @samp{armv9.2-a}, @samp{+mops}
 @item @samp{armv9.4-a} @tab Armv9.4-A @tab @samp{armv9.3-a}
 @item @samp{armv8-r} @tab Armv8-R @tab @samp{armv8-r}
@@ -21773,7 +21773,6 @@ default for @option{-march=armv8.6-a}.  Use of this option with architectures
 prior to Armv8.2-A is not supported.
 @item ls64
 Enable the 64-byte atomic load and store instructions for accelerators.
-This option is enabled by default for @option{-march=armv8.7-a}.
 @item mops
 Enable the instructions to accelerate memory operations like @code{memcpy},
 @code{memmove}, @code{memset}.  This option is enabled by default for