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| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-09-06 13:27:49 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-09-06 13:27:49 -0400 |
| commit | ccf5f34234559be0973687fc18c1801a467de6a2 (patch) | |
| tree | 82d33fecadde63b56050ff0555b5d2453b36ad97 | |
| parent | f8163c9219d854d89c9f46eab38e650596c7e9a6 (diff) | |
| download | gcc-ccf5f34234559be0973687fc18c1801a467de6a2.zip gcc-ccf5f34234559be0973687fc18c1801a467de6a2.tar.gz gcc-ccf5f34234559be0973687fc18c1801a467de6a2.tar.bz2 | |
(emit_libcall_block): Don't move insns that reference things set in
previous insns.
From-SVN: r5268
| -rw-r--r-- | gcc/optabs.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index 2ff6d2b..cc742a4 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -2295,9 +2295,10 @@ emit_libcall_block (insns, target, result, equiv) rtx prev, next, first, last, insn; /* First emit all insns that set pseudos. Remove them from the list as - we go. Avoid insns that set pseudo which were referenced in previous + we go. Avoid insns that set pseudos which were referenced in previous insns. These can be generated by move_by_pieces, for example, - to update an address. */ + to update an address. Similarly, avoid insns that reference things + set in previous insns. */ for (insn = insns; insn; insn = next) { @@ -2309,7 +2310,9 @@ emit_libcall_block (insns, target, result, equiv) && REGNO (SET_DEST (set)) >= FIRST_PSEUDO_REGISTER && (insn == insns || (! reg_mentioned_p (SET_DEST (set), PATTERN (insns)) - && ! reg_used_between_p (SET_DEST (set), insns, insn)))) + && ! reg_used_between_p (SET_DEST (set), insns, insn) + && ! modified_in_p (SET_SRC (set), insns) + && ! modified_between_p (SET_SRC (set), insns, insn)))) { if (PREV_INSN (insn)) NEXT_INSN (PREV_INSN (insn)) = next; |