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Diffstat (limited to 'gcc/doc/tm.texi')
| -rw-r--r-- | gcc/doc/tm.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index 51167f83cb8..bfb97e3ee19 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -3903,6 +3903,18 @@ need more space than is implied by @code{FUNCTION_VALUE_REGNO_P} for saving and restoring an arbitrary return value. @end defmac +@deftypefn {Target Hook} bool TARGET_RETURN_IN_MSB (tree @var{type}) +This hook should return true if values of type @var{type} are returned +at the most significant end of a register (in other words, if they are +padded at the least significant end). You can assume that @var{type} +is returned in a register; the caller is required to check this. + +Note that the register provided by @code{FUNCTION_VALUE} must be able +to hold the complete return value. For example, if a 1-, 2- or 3-byte +structure is returned at the most significant end of a 4-byte register, +@code{FUNCTION_VALUE} should provide an @code{SImode} rtx. +@end deftypefn + @node Aggregate Return @subsection How Large Values Are Returned @cindex aggregates as return values |
