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Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 9e755aa..e541a20 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -9511,6 +9511,17 @@ simplified expression for the call's result. If @var{ignore} is true the value will be ignored. @end deftypefn +@deftypefn {Target Hook} bool TARGET_INSN_VALID_WITHIN_DOLOOP (rtx @var{insn}) + +Take an instruction in @var{insn} and return true if it is valid within a +low-overhead loop. + +Many targets use special registers for low-overhead looping. This function +should return false for any instruction that clobbers these. +By default, the RTL loop optimizer does not use a present doloop pattern for +loops containing function calls or brach on table instructions. +@end deftypefn + @defmac MD_CAN_REDIRECT_BRANCH (@var{branch1}, @var{branch2}) Take a branch insn in @var{branch1} and another in @var{branch2}. |