diff options
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index f6660e4ff12..9f31e670966 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -4753,6 +4753,23 @@ cse_insn (rtx insn, rtx libcall_insn) src_elt_cost = MAX_COST; } + /* Avoid creation of overlapping memory moves. */ + if (MEM_P (trial) && MEM_P (SET_DEST (sets[i].rtl))) + { + rtx src, dest; + + /* BLKmode moves are not handled by cse anyway. */ + if (GET_MODE (trial) == BLKmode) + break; + + src = canon_rtx (trial); + dest = canon_rtx (SET_DEST (sets[i].rtl)); + + if (!MEM_P (src) || !MEM_P (dest) + || !nonoverlapping_memrefs_p (src, dest)) + break; + } + /* We don't normally have an insn matching (set (pc) (pc)), so check for this separately here. We will delete such an insn below. |