diff options
Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index b95001f685f..c7bf3f415d3 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -260,7 +260,8 @@ line, but, unlike @code{LIBGCC_SPEC}, it is used unmodified. @defmac USE_LD_AS_NEEDED A macro that controls the modifications to @code{LIBGCC_SPEC} mentioned in @code{REAL_LIBGCC_SPEC}. If nonzero, a spec will be -generated that uses --as-needed and the shared libgcc in place of the +generated that uses @option{--as-needed} or equivalent options and the +shared @file{libgcc} in place of the static exception handler library, when linking without any of @code{-static}, @code{-static-libgcc}, or @code{-shared-libgcc}. @end defmac @@ -2905,6 +2906,10 @@ A target hook which returns true if an address with the same structure can have This hook defines a class of registers which could be used for spilling pseudos of the given mode and class, or @code{NO_REGS} if only memory should be used. Not defining this hook is equivalent to returning @code{NO_REGS} for all inputs. @end deftypefn +@deftypefn {Target Hook} {enum machine_mode} TARGET_CSTORE_MODE (enum insn_code @var{icode}) +This hook defines the machine mode to use for the boolean result of conditional store patterns. The ICODE argument is the instruction code for the cstore being performed. Not definiting this hook is the same as accepting the mode encoded into operand 0 of the cstore expander patterns. +@end deftypefn + @node Old Constraints @section Obsolete Macros for Defining Constraints @cindex defining constraints, obsolete method @@ -9069,8 +9074,8 @@ The maximum number of bytes to skip before @var{label} when applying @end deftypefn @defmac LOOP_ALIGN (@var{label}) -The alignment (log base 2) to put in front of @var{label}, which follows -a @code{NOTE_INSN_LOOP_BEG} note. +The alignment (log base 2) to put in front of @var{label} that heads +a frequently executed basic block (usually the header of a loop). This macro need not be defined if you don't want any special alignment to be done at such a time. Most machine descriptions do not currently |