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| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/combine.c | 12 |
2 files changed, 20 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 0465625..d484572 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,11 @@ +2000-01-31 Chandra Chavva <cchavva@cygnus.com> + + * combine.c (try_combine) [HAVE_cc0]: Trying to check the missed + case 3->2 combining (combining with splitting) in which 2 is CC0 + setter/user and 3 is user. The rest of cases 2->1 and 3->2 are + checked at the begining of the function with the aid of calling + function 'can_combine_p'. + 2000-01-31 Dave Brolley <brolley@redhat.com> * cccp.c (struct argdata): Redeclare 'newlines' field as 'int'. diff --git a/gcc/combine.c b/gcc/combine.c index 8d578eb..62722c8 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2391,6 +2391,18 @@ try_combine (i3, i2, i1) distribute_notes (new_other_notes, undobuf.other_insn, undobuf.other_insn, NULL_RTX, NULL_RTX, NULL_RTX); } +#ifdef HAVE_cc0 + /* If I2 is the setter CC0 and I3 is the user CC0 then check whether + they are adjacent to each other or not. */ + { + rtx p = prev_nonnote_insn (i3); + if (p && p != i2 && GET_CODE (p) == INSN && newi2pat && sets_cc0_p (newi2pat)) + { + undo_all (); + return 0; + } + } +#endif /* We now know that we can do this combination. Merge the insns and update the status of registers and LOG_LINKS. */ |