diff options
Diffstat (limited to 'gas/doc/c-mips.texi')
| -rw-r--r-- | gas/doc/c-mips.texi | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/gas/doc/c-mips.texi b/gas/doc/c-mips.texi index e6fe033..136d2d2 100644 --- a/gas/doc/c-mips.texi +++ b/gas/doc/c-mips.texi @@ -32,6 +32,7 @@ Assembly Language Programming'' in the same work. * MIPS option stack:: Directives to save and restore options * MIPS ASE instruction generation overrides:: Directives to control generation of MIPS ASE instructions +* MIPS floating-point:: Directives to override floating-point options @end menu @node MIPS Opts @@ -272,7 +273,8 @@ m4kp, sb1, sb1a, loongson2e, -loongson2f +loongson2f, +octeon @end quotation For compatibility reasons, @samp{@var{n}x} and @samp{@var{b}fx} are @@ -301,10 +303,21 @@ other assemblers, which use it to turn off C style preprocessing. With @sc{gnu} @code{@value{AS}}, there is no need for @samp{-nocpp}, because the @sc{gnu} assembler itself never runs the C preprocessor. +@item -msoft-float +@itemx -mhard-float +Disable or enable floating-point instructions. Note that by default +floating-point instructions are always allowed even with CPU targets +that don't have support for these instructions. + +@item -msingle-float +@itemx -mdouble-float +Disable or enable double-precision floating-point operations. Note +that by default double-precision floating-point operations are always +allowed even with CPU targets that don't have support for these +operations. + @item --construct-floats @itemx --no-construct-floats -@cindex --construct-floats -@cindex --no-construct-floats The @code{--no-construct-floats} option disables the construction of double width floating point constants by loading the two halves of the value into the two single width floating point registers that make up @@ -579,3 +592,26 @@ in the assembly. The @code{.set nomt} directive prevents MT instructions from being accepted. Traditional @sc{mips} assemblers do not support these directives. + +@node MIPS floating-point +@section Directives to override floating-point options + +@cindex Disable floating-point instructions +@kindex @code{.set softfloat} +@kindex @code{.set hardfloat} +The directives @code{.set softfloat} and @code{.set hardfloat} provide +finer control of disabling and enabling float-point instructions. +These directives always override the default (that hard-float +instructions are accepted) or the command-line options +(@samp{-msoft-float} and @samp{-mhard-float}). + +@cindex Disable single-precision floating-point operations +@kindex @code{.set softfloat} +@kindex @code{.set hardfloat} +The directives @code{.set singlefloat} and @code{.set doublefloat} +provide finer control of disabling and enabling double-precision +float-point operations. These directives always override the default +(that double-precision operations are accepted) or the command-line +options (@samp{-msingle-float} and @samp{-mdouble-float}). + +Traditional @sc{mips} assemblers do not support these directives. |