diff options
Diffstat (limited to 'gcc/expr.h')
| -rw-r--r-- | gcc/expr.h | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/gcc/expr.h b/gcc/expr.h index 242329a37be..24a391cc7f6 100644 --- a/gcc/expr.h +++ b/gcc/expr.h @@ -84,6 +84,13 @@ enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, #define CLEAR_RATIO (optimize_size ? 3 : 15) #endif #endif + +/* If a memory set (to value other than zero) operation would take + SET_RATIO or more simple move-instruction sequences, we will do a movmem + or libcall instead. */ +#ifndef SET_RATIO +#define SET_RATIO MOVE_RATIO +#endif enum direction {none, upward, downward}; @@ -444,20 +451,23 @@ extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); CONSTFUN with several move instructions by store_by_pieces function. CONSTFUNDATA is a pointer which will be passed as argument in every CONSTFUN call. - ALIGN is maximum alignment we can assume. */ + ALIGN is maximum alignment we can assume. + MEMSETP is true if this is a real memset/bzero, not a copy + of a const string. */ extern int can_store_by_pieces (unsigned HOST_WIDE_INT, rtx (*) (void *, HOST_WIDE_INT, enum machine_mode), - void *, unsigned int); + void *, unsigned int, bool); /* Generate several move instructions to store LEN bytes generated by CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a pointer which will be passed as argument in every CONSTFUN call. ALIGN is maximum alignment we can assume. + MEMSETP is true if this is a real memset/bzero, not a copy. Returns TO + LEN. */ extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, rtx (*) (void *, HOST_WIDE_INT, enum machine_mode), - void *, unsigned int, int); + void *, unsigned int, bool, int); /* Emit insns to set X from Y. */ extern rtx emit_move_insn (rtx, rtx); |