doc: Update -falign-functions/-falign-loops/-falign-jumps

Change -falign-functions=N to

    Align the start of functions to the next power-of-two greater than
    or equal to N.

Add

    If '-falign-labels' is greater than this value, then its value is
    used instead.

to -falign-loops=N and -falign-jumps=N.

	PR driver/94381
	* doc/invoke.texi: Update -falign-functions, -falign-loops and
	-falign-jumps documentation.

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3d0a7e5f6f34325eb132f706f5272d807a6bd53c..29900e19154809f0401b3ad2d5dbb54a75ba01a7 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2020-03-29  H.J. Lu  <hongjiu.lu@intel.com>
+
+       PR driver/94381
+       * doc/invoke.texi: Update -falign-functions, -falign-loops and
+       -falign-jumps documentation.
+
 2020-03-29  Martin Liska  <mliska@suse.cz>
 
        PR ipa/94363

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index c2053a3804fb1af9eb8e4309f20621afa5df2d76..412750c1fc968481790893e37d73540283d6eeae 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -10939,9 +10939,9 @@ The @option{-fstrict-aliasing} option is enabled at levels
 @itemx -falign-functions=@var{n}:@var{m}:@var{n2}
 @itemx -falign-functions=@var{n}:@var{m}:@var{n2}:@var{m2}
 @opindex falign-functions
-Align the start of functions to the next power-of-two greater than
-@var{n}, skipping up to @var{m}-1 bytes.  This ensures that at least
-the first @var{m} bytes of the function can be fetched by the CPU
+Align the start of functions to the next power-of-two greater than or
+equal to @var{n}, skipping up to @var{m}-1 bytes.  This ensures that at
+least the first @var{m} bytes of the function can be fetched by the CPU
 without crossing an @var{n}-byte alignment boundary.
 
 If @var{m} is not specified, it defaults to @var{n}.
@@ -11007,6 +11007,9 @@ Align loops to a power-of-two boundary.  If the loops are executed
 many times, this makes up for any execution of the dummy padding
 instructions.
 
+If @option{-falign-labels} is greater than this value, then its value
+is used instead.
+
 Parameters of this option are analogous to the @option{-falign-functions} option.
 @option{-fno-align-loops} and @option{-falign-loops=1} are
 equivalent and mean that loops are not aligned.
@@ -11026,6 +11029,9 @@ Align branch targets to a power-of-two boundary, for branch targets
 where the targets can only be reached by jumping.  In this case,
 no dummy operations need be executed.
 
+If @option{-falign-labels} is greater than this value, then its value
+is used instead.
+
 Parameters of this option are analogous to the @option{-falign-functions} option.
 @option{-fno-align-jumps} and @option{-falign-jumps=1} are
 equivalent and mean that loops are not aligned.