diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index b3a731a3266..8499d72bac6 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -464,7 +464,7 @@ in the following sections. -mabi=32 -mabi=n32 -mabi=64 -mabi=eabi @gol -mfix7000 -mno-crt0} -@emph{i386 Options} +@emph{i386 and x86-64 Options} @gccoptlist{ -mcpu=@var{cpu-type} -march=@var{cpu-type} @gol -mintel-syntax -mieee-fp -mno-fancy-math-387 @gol @@ -474,7 +474,9 @@ in the following sections. -mmmx -msse -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} +-m96bit-long-double -mregparm=@var{num} -momit-leaf-frame-pointer @gol +-mno-red-zone@gol +-m32 -m64} @emph{HPPA Options} @gccoptlist{ @@ -5077,7 +5079,7 @@ that macro, which enables you to change the defaults. * RS/6000 and PowerPC Options:: * RT Options:: * MIPS Options:: -* i386 Options:: +* i386 and x86-64 Options:: * HPPA Options:: * Intel 960 Options:: * DEC Alpha Options:: @@ -7418,12 +7420,15 @@ options is also defined by that macro, which enables you to change the defaults. @end ifset -@node i386 Options -@subsection Intel 386 Options +@node i386 and x86-64 Options +@subsection Intel 386 and AMD x86-64 Options @cindex i386 Options +@cindex x86-64 Options @cindex Intel 386 Options +@cindex AMD x86-64 Options -These @samp{-m} options are defined for the i386 family of computers: +These @samp{-m} options are defined for the i386 and x86-64 family of +computers: @table @gcctabopt @item -mcpu=@var{cpu-type} @@ -8027,6 +8032,29 @@ makes an extra register available in leaf functions. The option which might make debugging harder. @end table +These @samp{-m} switches are supported in addition to the above +on AMD x86-64 processors in 64-bit environments. + +@table @gcctabopt +@item -m32 +@itemx -m64 +@opindex m32 +@opindex m64 +Generate code for a 32-bit or 64-bit environment. +The 32-bit environment sets int, long and pointer to 32 bits and +generates code that runs on any i386 system. +The 64-bit environment sets int to 32 bits and long and pointer +to 64 bits and generates code for AMD's x86-64 architecture. + +@item -mno-red-zone +@opindex no-red-zone +Do not use a so called red zone for x86-64 code. The red zone is mandated +by the x86-64 ABI, it is a 128-byte area beyond the location of the +stack pointer that will not be modified by signal or interrupt handlers +and therefore can be used for temporary data without adjusting the stack +pointer. The flag @option{-mno-red-zone} disables this red zone. +@end table + @node HPPA Options @subsection HPPA Options @cindex HPPA Options |