diff options
Diffstat (limited to 'contrib/gcc/doc/invoke.texi')
| -rw-r--r-- | contrib/gcc/doc/invoke.texi | 100 |
1 files changed, 77 insertions, 23 deletions
diff --git a/contrib/gcc/doc/invoke.texi b/contrib/gcc/doc/invoke.texi index a56e3ed..0b527b2 100644 --- a/contrib/gcc/doc/invoke.texi +++ b/contrib/gcc/doc/invoke.texi @@ -157,7 +157,7 @@ in the following sections. @xref{Overall Options,,Options Controlling the Kind of Output}. @gccoptlist{ -c -S -E -o @var{file} -pipe -pass-exit-codes -x @var{language} @gol --v -### --target-help --help} +-v -### --help --target-help --version} @item C Language Options @xref{C Dialect Options,,Options Controlling C Dialect}. @@ -236,8 +236,9 @@ in the following sections. @item C-only Warning Options @gccoptlist{ --Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes @gol --Wnested-externs -Wstrict-prototypes -Wtraditional} +-Wbad-function-cast -Wmissing-declarations @gol +-Wmissing-prototypes -Wnested-externs @gol +-Wstrict-prototypes -Wtraditional} @item Debugging Options @xref{Debugging Options,,Options for Debugging Your Program or GCC}. @@ -248,7 +249,8 @@ in the following sections. -fdump-tree-original@r{[}-@var{n}@r{]} -fdump-tree-optimized@r{[}-@var{n}@r{]} @gol -fdump-tree-inlined@r{[}-@var{n}@r{]} @gol -fmem-report -fpretend-float @gol --fprofile-arcs -ftest-coverage -ftime-report @gol +-fprofile-arcs -fsched-verbose=@var{n} @gol +-ftest-coverage -ftime-report @gol -g -g@var{level} -gcoff -gdwarf -gdwarf-1 -gdwarf-1+ -gdwarf-2 @gol -ggdb -gstabs -gstabs+ -gvms -gxcoff -gxcoff+ @gol -p -pg -print-file-name=@var{library} -print-libgcc-file-name @gol @@ -261,6 +263,7 @@ in the following sections. @gccoptlist{ -falign-functions=@var{n} -falign-jumps=@var{n} @gol -falign-labels=@var{n} -falign-loops=@var{n} @gol +-fbounds-check @gol -fbranch-probabilities -fcaller-saves -fcprop-registers @gol -fcse-follow-jumps -fcse-skip-blocks -fdata-sections @gol -fdelayed-branch -fdelete-null-pointer-checks @gol @@ -269,7 +272,8 @@ in the following sections. -fgcse -fgcse-lm -fgcse-sm @gol -finline-functions -finline-limit=@var{n} -fkeep-inline-functions @gol -fkeep-static-consts -fmerge-constants -fmerge-all-constants @gol --fmove-all-movables -fno-default-inline -fno-defer-pop @gol +-fmove-all-movables -fno-branch-count-reg @gol +-fno-default-inline -fno-defer-pop @gol -fno-function-cse -fno-guess-branch-probability @gol -fno-inline -fno-math-errno -fno-peephole -fno-peephole2 @gol -funsafe-math-optimizations -fno-trapping-math @gol @@ -278,6 +282,8 @@ in the following sections. -freduce-all-givs -fregmove -frename-registers @gol -frerun-cse-after-loop -frerun-loop-opt @gol -fschedule-insns -fschedule-insns2 @gol +-fno-sched-interblock -fno-sched-spec @gol +-fsched-spec-load -fsched-spec-load-dangerous @gol -fsingle-precision-constant -fssa -fssa-ccp -fssa-dce @gol -fstrength-reduce -fstrict-aliasing -fthread-jumps @gol -ftrapv -funroll-all-loops -funroll-loops @gol @@ -481,7 +487,7 @@ in the following sections. -mno-fp-ret-in-387 -msoft-float -msvr3-shlib @gol -mno-wide-multiply -mrtd -malign-double @gol -mpreferred-stack-boundary=@var{num} @gol --mmmx -msse -msse2 -msse-math -m3dnow @gol +-mmmx -msse -msse2 -m3dnow @gol -mthreads -mno-align-stringops -minline-all-stringops @gol -mpush-args -maccumulate-outgoing-args -m128bit-long-double @gol -m96bit-long-double -mregparm=@var{num} -momit-leaf-frame-pointer @gol @@ -915,6 +921,10 @@ be displayed. @opindex target-help Print (on the standard output) a description of target specific command line options for each tool. + +@item --version +@opindex version +Display the version number and copyrights of the invoked GCC. @end table @node Invoking G++ @@ -2923,18 +2933,7 @@ optimization and code generation options plus Control Optimization}). The other use of @option{-fprofile-arcs} is for use with @code{gcov}, -when it is used with the @option{-ftest-coverage} option. GCC -supports two methods of determining code coverage: the options that -support @code{gcov}, and options @option{-a} and @option{-ax}, which -write information to text files. The options that support @code{gcov} -do not need to instrument every arc in the program, so a program compiled -with them runs faster than a program compiled with @option{-a}, which -adds instrumentation code to every basic block in the program. The -tradeoff: since @code{gcov} does not have execution counts for all -branches, it must start with the execution counts for the instrumented -branches, and then iterate over the program flow graph until the entire -graph has been solved. Hence, @code{gcov} runs a little more slowly than -a program which uses information from @option{-a} and @option{-ax}. +when it is used with the @option{-ftest-coverage} option. With @option{-fprofile-arcs}, for each function of your program GCC creates a program flow graph, then finds a spanning tree for the graph. @@ -2944,11 +2943,6 @@ executed. When an arc is the only exit or only entrance to a block, the instrumentation code can be added to the block; otherwise, a new basic block must be created to hold the instrumentation code. -This option makes it possible to estimate branch probabilities and to -calculate basic block execution counts. In general, basic block -execution counts as provided by @option{-a} do not give enough -information to estimate all branch probabilities. - @need 2000 @item -ftest-coverage @opindex ftest-coverage @@ -3180,6 +3174,23 @@ Dump after all tree based optimization, to @file{@var{file}.optimized}. Dump after function inlining, to @file{@var{file}.inlined}. @end table +@item -fsched-verbose=@var{n} +@opindex fsched-verbose +On targets that use instruction scheduling, this option controls the +amount of debugging output the scheduler prints. This information is +written to standard error, unless @option{-dS} or @option{-dR} is +specified, in which case it is output to the usual dump +listing file, @file{.sched} or @file{.sched2} respectively. However +for @var{n} greater than nine, the output is always printed to standard +error. + +For @var{n} greater than zero, @option{-fsched-verbose} outputs the +same information as @option{-dRS}. For @var{n} greater than one, it +also output basic block probabilities, detailed ready list information +and unit/insn info. For @var{n} greater than two, it includes RTL +at abort point, control-flow and regions info. And for @var{n} over +four, @option{-fsched-verbose} also includes dependence info. + @item -fpretend-float @opindex fpretend-float When running a cross-compiler, pretend that the target machine uses the @@ -3484,6 +3495,14 @@ types. Languages like C or C++ require each non-automatic variable to have distinct location, so using this option will result in non-conforming behavior. +@item -fno-branch-count-reg +@opindex fno-branch-count-reg +Do not use ``decrement and branch'' instructions on a count register, +but instead generate a sequence of instructions that decrement a +register, compare it against zero, then branch based upon the result. +This option is only meaningful on architectures that support such +instructions, which include x86, PowerPC, IA-64 and S/390. + @item -fno-function-cse @opindex fno-function-cse Do not put function addresses in registers; make each instruction that @@ -3546,6 +3565,14 @@ an exact implementation of IEEE or ISO rules/specifications for math functions. The default is @option{-ftrapping-math}. + +@item -fbounds-check +@opindex fbounds-check +For front-ends that support it, generate additional code to check that +indices used to access arrays are within the declared range. This is +currenly only supported by the Java and Fortran 77 front-ends, where +this option defaults to true and false respectively. + @end table The following options control specific optimizations. The @option{-O2} @@ -3673,6 +3700,30 @@ instruction scheduling after register allocation has been done. This is especially useful on machines with a relatively small number of registers and where memory load instructions take more than one cycle. +@item -fno-sched-interblock +@opindex fno-sched-interblock +Don't schedule instructions across basic blocks. This is normally +enabled by default when scheduling before register allocation, i.e.@: +with @option{-fschedule-insns} or at @option{-O2} or higher. + +@item -fno-sched-spec +@opindex fno-sched-spec +Don't allow speculative motion of non-load instructions. This is normally +enabled by default when scheduling before register allocation, i.e.@: +with @option{-fschedule-insns} or at @option{-O2} or higher. + +@item -fsched-spec-load +@opindex fsched-spec-load +Allow speculative motion of some load instructions. This only makes +sense when scheduling before register allocation, i.e.@: with +@option{-fschedule-insns} or at @option{-O2} or higher. + +@item -fsched-spec-load-dangerous +@opindex fsched-spec-load-dangerous +Allow speculative motion of more load instructions. This only makes +sense when scheduling before register allocation, i.e.@: with +@option{-fschedule-insns} or at @option{-O2} or higher. + @item -ffunction-sections @itemx -fdata-sections @opindex ffunction-sections @@ -7575,6 +7626,9 @@ direct access to the MMX, SSE and 3Dnow extensions of the instruction set. @xref{X86 Built-in Functions}, for details of the functions enabled and disabled by these switches. +To have SSE/SSE2 instructions generated automatically from floating-point code, +see @option{-mfpmath=sse}. + @item -mpush-args @itemx -mno-push-args @opindex mpush-args |
