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Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 2b2ebc85aef..b5bd719d659 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -14797,6 +14797,33 @@ useful when compiling kernel code. A register range is specified as two registers separated by a dash. Multiple register ranges can be specified separated by a comma. +@item -mdual-nops +@itemx -mdual-nops=@var{n} +@opindex mdual-nops +By default, GCC will insert nops to increase dual issue when it expects +it to increase performance. @var{n} can be a value from 0 to 10. A +smaller @var{n} will insert fewer nops. 10 is the default, 0 is the +same as @option{-mno-dual-nops}. Disabled with @option{-Os}. + +@item -mhint-max-nops=@var{n} +@opindex mhint-max-nops +Maximum number of nops to insert for a branch hint. A branch hint must +be at least 8 instructions away from the branch it is effecting. GCC +will insert up to @var{n} nops to enforce this, otherwise it will not +generate the branch hint. + +@item -mhint-max-distance=@var{n} +@opindex mhint-max-distance +The encoding of the branch hint instruction limits the hint to be within +256 instructions of the branch it is effecting. By default, GCC makes +sure it is within 125. + +@item -msafe-hints +@opindex msafe-hints +Work around a hardware bug which causes the SPU to stall indefinitely. +By default, GCC will insert the @code{hbrp} instruction to make sure +this stall won't happen. + @end table @node System V Options |