diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 50 |
1 files changed, 42 insertions, 8 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index a104c548e38..0bcd3d9d85c 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -277,6 +277,7 @@ Objective-C and Objective-C++ Dialects}. -fdump-tree-sra@r{[}-@var{n}@r{]} @gol -fdump-tree-salias @gol -fdump-tree-fre@r{[}-@var{n}@r{]} @gol +-fdump-tree-vrp@r{[}-@var{n}@r{]} @gol -ftree-vectorizer-verbose=@var{n} @gol -fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol -feliminate-dwarf2-dups -feliminate-unused-debug-types @gol @@ -636,7 +637,7 @@ See RS/6000 and PowerPC Options. -minsert-sched-nops=@var{scheme} @gol -mcall-sysv -mcall-netbsd @gol -maix-struct-return -msvr4-struct-return @gol --mabi=@var{abi-type} @gol +-mabi=@var{abi-type} -msecure-plt -mbss-plt @gol -misel -mno-isel @gol -misel=yes -misel=no @gol -mspe -mno-spe @gol @@ -732,6 +733,7 @@ See S/390 and zSeries Options. -finhibit-size-directive -finstrument-functions @gol -fno-common -fno-ident @gol -fpcc-struct-return -fpic -fPIC -fpie -fPIE @gol +-fno-jump-tables @gol -freg-struct-return -fshared-data -fshort-enums @gol -fshort-double -fshort-wchar @gol -fverbose-asm -fpack-struct[=@var{n}] -fstack-check @gol @@ -4066,6 +4068,11 @@ file name. Dump each function after applying vectorization of loops. The file name is made by appending @file{.vect} to the source file name. +@item vrp +@opindex fdump-tree-vrp +Dump each function after Value Range Propagation (VRP). The file name +is made by appending @file{.vrp} to the source file name. + @item all @opindex fdump-tree-all Enable all the available tree dumps with the flags provided in this option. @@ -4320,6 +4327,7 @@ also turns on the following optimization flags: -funit-at-a-time @gol -falign-functions -falign-jumps @gol -falign-loops -falign-labels @gol +-ftree-vrp @gol -ftree-pre} Please note the warning under @option{-fgcse} about @@ -4470,7 +4478,7 @@ See below for a documentation of the individual parameters controlling inlining. @emph{Note:} pseudo instruction represents, in this particular context, an -abstract measurement of function's size. In no way, it represents a count +abstract measurement of function's size. In no way does it represent a count of assembly instructions and as such its exact meaning might change from one release to an another. @@ -4962,6 +4970,15 @@ optimization later. This is enabled by default at @option{-O} and higher. @item -ftree-vectorize Perform loop vectorization on trees. +@item -ftree-vrp +Perform Value Range Propagation on trees. This is similar to the +constant propagation pass, but instead of values, ranges of values are +propagated. This allows the optimizers to remove unnecessary range +checks like array bound checks and null pointer checks. This is +enabled by default at @option{-O2} and higher. Null pointer check +elimination is only done if @option{-fdelete-null-pointer-checks} is +enabled. + @item -ftracer @opindex ftracer Perform tail duplication to enlarge superblock size. This transformation @@ -6883,10 +6900,6 @@ Some configurations of the compiler also support additional special options, usually for compatibility with other compilers on the same platform. -These options are defined by the macro @code{TARGET_SWITCHES} in the -machine description. The default for the options is also defined by -that macro, which enables you to change the defaults. - @c This list is ordered alphanumerically by subsection name. @c It should be the same order and spelling as these options are listed @c in Machine Dependent Options @@ -10733,6 +10746,18 @@ ABI@. @opindex mabi=no-spe Disable Booke SPE ABI extensions for the current ABI@. +@item -msecure-plt +@opindex msecure-plt +Generate code that allows ld and ld.so to build executables and shared +libraries with non-exec .plt and .got sections. This is a PowerPC +32-bit SYSV ABI option. + +@item -mbss-plt +@opindex mbss-plt +Generate code that uses a BSS .plt section that ld.so fills in, and +requires .plt and .got sections that are both writable and executable. +This is a PowerPC 32-bit SYSV ABI option. + @item -misel @itemx -mno-isel @opindex misel @@ -12574,6 +12599,15 @@ generated position independent code can be only linked into executables. Usually these options are used when @option{-pie} GCC option will be used during linking. +@item -fno-jump-tables +@opindex fno-jump-tables +Do not use jump tables for switch statements even where it would be +more efficient than other code generation strategies. This option is +of use in conjunction with @option{-fpic} or @option{-fPIC} for +building code which forms part of a dynamic linker and cannot +reference the address of a jump table. On some targets, jump tables +do not require a GOT and this option is not needed. + @item -ffixed-@var{reg} @opindex ffixed Treat the register named @var{reg} as a fixed register; generated code @@ -12774,8 +12808,8 @@ For those adding visibility support to existing code, you may find @samp{#pragma GCC visibility} of use. This works by you enclosing the declarations you wish to set visibility for with (for example) @samp{#pragma GCC visibility push(hidden)} and -@samp{#pragma GCC visibility pop}. These can be nested up to sixteen -times. Bear in mind that symbol visibility should be viewed @strong{as +@samp{#pragma GCC visibility pop}. +Bear in mind that symbol visibility should be viewed @strong{as part of the API interface contract} and thus all new code should always specify visibility when it is not the default ie; declarations only for use within the local DSO should @strong{always} be marked explicitly |