diff options
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 28 |
1 files changed, 21 insertions, 7 deletions
@@ -8106,18 +8106,32 @@ maybe_eliminate_biv (bl, loop_start, end, eliminate_p, threshold, insn_count) } /* INSN and REFERENCE are instructions in the same insn chain. - Return non-zero if INSN is first. - This is like insn_first_p, except that we use the luid information if - available. */ + Return non-zero if INSN is first. */ int loop_insn_first_p (insn, reference) rtx insn, reference; { - return ((INSN_UID (insn) < max_uid_for_loop - && INSN_UID (reference) < max_uid_for_loop) - ? INSN_LUID (insn) < INSN_LUID (reference) - : insn_first_p (insn, reference)); + rtx p, q; + + for (p = insn, q = reference; ;) + { + /* Start with test for not first so that INSN == REFERENCE yields not + first. */ + if (q == insn || ! p) + return 0; + if (p == reference || ! q) + return 1; + + if (INSN_UID (p) < max_uid_for_loop + && INSN_UID (q) < max_uid_for_loop) + return INSN_LUID (p) < INSN_LUID (q); + + if (INSN_UID (p) >= max_uid_for_loop) + p = NEXT_INSN (p); + if (INSN_UID (q) >= max_uid_for_loop) + q = NEXT_INSN (q); + } } /* We are trying to eliminate BIV in INSN using GIV. Return non-zero if |