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

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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.
This commit is contained in:
H.J. Lu 2020-03-29 15:54:42 -07:00
parent 60c254b279
commit dacc7effee
2 changed files with 15 additions and 3 deletions
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6
gcc/ChangeLog
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@ -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

12
gcc/doc/invoke.texi
View File

@ -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.