OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(fill_slots_from_thread): When replacing a use of a register with what it was set to... 

(fill_slots_from_thread): When replacing a use of a register with what
it was set to, don't do it when either the destination or source of
the copy is set in the insn.

From-SVN: r4716
This commit is contained in:
Richard Kenner 1993-06-23 07:54:14 -04:00
parent c71ebae3c4
commit 963d6142cc
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
gcc/reorg.c
View File

@ -3237,9 +3237,11 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
but it doesn't seem worth it. It might also be a good idea to try
to swap the two insns. That might do better.
We can't do this if the next insn modifies our source, because that
would make the replacement into the insn invalid. This also
prevents updating the contents of a PRE_INC. */
We can't do this if the next insn modifies our destination, because
that would make the replacement into the insn invalid. We also can't
do this if it modifies our source, because it might be an earlyclobber
operand. This latter test also prevents updating the contents of
a PRE_INC. */
if (GET_CODE (trial) == INSN && GET_CODE (pat) == SET
&& GET_CODE (SET_SRC (pat)) == REG
@ -3250,6 +3252,7 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
if (next && GET_CODE (next) == INSN
&& GET_CODE (PATTERN (next)) != USE
&& ! reg_set_p (SET_DEST (pat), next)
&& ! reg_set_p (SET_SRC (pat), next)
&& reg_referenced_p (SET_DEST (pat), PATTERN (next)))
validate_replace_rtx (SET_DEST (pat), SET_SRC (pat), next);
}