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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-03-29 15:54:42 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-03-29 15:54:53 -0700 |
| commit | dacc7effeead9ad3e63673f6957661c55e351eb9 (patch) | |
| tree | 2dd31a3f23256a7d59187556930386b8ffdfa09d /gcc | |
| parent | 60c254b279e8e8443b8ad26cc46b9e4084cff66c (diff) | |
| download | gcc-dacc7effeead9ad3e63673f6957661c55e351eb9.zip gcc-dacc7effeead9ad3e63673f6957661c55e351eb9.tar.gz gcc-dacc7effeead9ad3e63673f6957661c55e351eb9.tar.bz2 | |
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.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
2 files changed, 15 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3d0a7e5..29900e1 100644 --- 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 c2053a3..412750c 100644 --- 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. |