diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 067dca8..8d69284 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -887,7 +887,8 @@ See RS/6000 and PowerPC Options. -mdivsi3_libfunc=@var{name} -mfixed-range=@var{register-range} @gol -madjust-unroll -mindexed-addressing -mgettrcost=@var{number} -mpt-fixed @gol -maccumulate-outgoing-args -minvalid-symbols -msoft-atomic @gol --mbranch-cost=@var{num} -mcbranchdi -mcmpeqdi -mfused-madd -mpretend-cmove} +-mbranch-cost=@var{num} -mcbranchdi -mcmpeqdi -mfused-madd -mpretend-cmove @gol +-menable-tas} @emph{Solaris 2 Options} @gccoptlist{-mimpure-text -mno-impure-text @gol @@ -17934,6 +17935,15 @@ single-core systems. They will not perform correctly on multi-core systems. This option is enabled by default when the target is @code{sh-*-linux*}. For details on the atomic built-in functions see @ref{__atomic Builtins}. +@item -menable-tas +@opindex menable-tas +Generate the @code{tas.b} opcode for @code{__atomic_test_and_set}. +Notice that depending on the particular hardware and software configuration +this can degrade overall performance due to the operand cache line flushes +that are implied by the @code{tas.b} instruction. On multi-core SH4A +processors the @code{tas.b} instruction must be used with caution since it +can result in data corruption for certain cache configurations. + @item -mspace @opindex mspace Optimize for space instead of speed. Implied by @option{-Os}. |