diff options
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/combine.c | 13 |
2 files changed, 16 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 97dea44..02b3a5f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -5,6 +5,10 @@ Tue Aug 18 12:40:27 1998 Richard Henderson <rth@cygnus.com> Tue Aug 18 10:33:30 1998 Jeffrey A Law (law@cygnus.com) + * combine.c (can_combine_p): Allow combining insns with REG_RETVAL + notes. + (try_combine): Allow combining insns with REG_LIBCALL notes. + * expr.c (emit_block_move): Do not call memcpy as a libcall instead build up a CALL_EXPR and call it like any other function. diff --git a/gcc/combine.c b/gcc/combine.c index 155585b..5c050f2 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -958,8 +958,14 @@ can_combine_p (insn, i3, pred, succ, pdest, psrc) /* Don't substitute into an incremented register. */ || FIND_REG_INC_NOTE (i3, dest) || (succ && FIND_REG_INC_NOTE (succ, dest)) +#if 0 /* Don't combine the end of a libcall into anything. */ + /* ??? This gives worse code, and appears to be unnecessary, since no + pass after flow uses REG_LIBCALL/REG_RETVAL notes. Local-alloc does + use REG_RETVAL notes for noconflict blocks, but other code here + makes sure that those insns don't disappear. */ || find_reg_note (insn, REG_RETVAL, NULL_RTX) +#endif /* Make sure that DEST is not used after SUCC but before I3. */ || (succ && ! all_adjacent && reg_used_between_p (dest, succ, i3)) @@ -1371,7 +1377,12 @@ try_combine (i3, i2, i1) if (GET_RTX_CLASS (GET_CODE (i3)) != 'i' || GET_RTX_CLASS (GET_CODE (i2)) != 'i' || (i1 && GET_RTX_CLASS (GET_CODE (i1)) != 'i') - || find_reg_note (i3, REG_LIBCALL, NULL_RTX)) +#if 0 + /* ??? This gives worse code, and appears to be unnecessary, since no + pass after flow uses REG_LIBCALL/REG_RETVAL notes. */ + || find_reg_note (i3, REG_LIBCALL, NULL_RTX) +#endif +) return 0; combine_attempts++; |