diff options
Diffstat (limited to 'gcc/tm.texi')
| -rw-r--r-- | gcc/tm.texi | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/tm.texi b/gcc/tm.texi index 1e6a62b1cc1..3f451d1f5b0 100644 --- a/gcc/tm.texi +++ b/gcc/tm.texi @@ -1361,7 +1361,7 @@ One use of this macro is on machines where the highest numbered registers must always be saved and the save-multiple-registers instruction supports only sequences of consecutive registers. On such machines, define @code{REG_ALLOC_ORDER} to be an initializer that lists -the highest numbered allocatable register first. +the highest numbered allocable register first. @findex ORDER_REGS_FOR_LOCAL_ALLOC @item ORDER_REGS_FOR_LOCAL_ALLOC @@ -1465,14 +1465,14 @@ be used unless some pattern's constraint asks for one. @findex MODES_TIEABLE_P @item MODES_TIEABLE_P (@var{mode1}, @var{mode2}) A C expression that is nonzero if a value of mode -@var{mode1} is accessable in mode @var{mode2} without copying. +@var{mode1} is accessible in mode @var{mode2} without copying. If @code{HARD_REGNO_MODE_OK (@var{r}, @var{mode1})} and @code{HARD_REGNO_MODE_OK (@var{r}, @var{mode2})} are always the same for any @var{r}, then @code{MODES_TIEABLE_P (@var{mode1}, @var{mode2})} should be nonzero. If they differ for any @var{r}, you should define this macro to return zero unless some other mechanism ensures the -accessability of the value in a narrower mode. +accessibility of the value in a narrower mode. You should define this macro to return nonzero in as many cases as possible since doing so will allow GNU CC to perform better register @@ -3333,7 +3333,7 @@ the function prologue. Normally, the profiling code comes after. A C statement or compound statement to output to @var{file} some assembler code to initialize basic-block profiling for the current object module. The global compile flag @code{profile_block_flag} -distingishes two profile modes. +distinguishes two profile modes. @table @code @findex __bb_init_func @@ -3393,7 +3393,7 @@ call __bb_init_trace_func A C statement or compound statement to output to @var{file} some assembler code to increment the count associated with the basic block number @var{blockno}. The global compile flag -@code{profile_block_flag} distingishes two profile modes. +@code{profile_block_flag} distinguishes two profile modes. @table @code @item profile_block_flag != 2 @@ -5479,6 +5479,18 @@ which defines (equates) the symbol @var{name} to have the value @var{value}. If SET_ASM_OP is defined, a default definition is provided which is correct for most systems. +@findex ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL +@item ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL (@var{stream}, @var{symbol}, @var{high}, @var{low}) +A C statement to output to the stdio stream @var{stream} assembler code +which defines (equates) the symbol @var{symbol} to have a value equal to +the difference of the two symbols @var{high} and @var{low}, i.e. +@var{high} minus @var{low}. GNU CC guarantees that the symbols @var{high} +and @var{low} are already known by the assembler so that the difference +resolves into a constant. + +If SET_ASM_OP is defined, a default definition is provided which is +correct for most systems. + @findex ASM_OUTPUT_WEAK_ALIAS @item ASM_OUTPUT_WEAK_ALIAS (@var{stream}, @var{name}, @var{value}) A C statement to output to the stdio stream @var{stream} assembler code |