diff options
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index 2b765c821d8..20ecc53f524 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -4655,12 +4655,18 @@ for_each_insn_in_loop (struct loop *loop, loop_insn_callback fncall) int not_every_iteration = 0; int maybe_multiple = 0; int past_loop_latch = 0; + bool exit_test_is_entry = false; rtx p; - /* If loop_scan_start points to the loop exit test, we have to be wary of - subversive use of gotos inside expression statements. */ + /* If loop_scan_start points to the loop exit test, the loop body + cannot be counted on running on every iteration, and we have to + be wary of subversive use of gotos inside expression + statements. */ if (prev_nonnote_insn (loop->scan_start) != prev_nonnote_insn (loop->start)) - maybe_multiple = back_branch_in_range_p (loop, loop->scan_start); + { + exit_test_is_entry = true; + maybe_multiple = back_branch_in_range_p (loop, loop->scan_start); + } /* Scan through loop and update NOT_EVERY_ITERATION and MAYBE_MULTIPLE. */ for (p = next_insn_in_loop (loop, loop->scan_start); @@ -4718,10 +4724,12 @@ for_each_insn_in_loop (struct loop *loop, loop_insn_callback fncall) beginning, don't set not_every_iteration for that. This can be any kind of jump, since we want to know if insns will be executed if the loop is executed. */ - && !(JUMP_LABEL (p) == loop->top - && ((NEXT_INSN (NEXT_INSN (p)) == loop->end - && any_uncondjump_p (p)) - || (NEXT_INSN (p) == loop->end && any_condjump_p (p))))) + && (exit_test_is_entry + || !(JUMP_LABEL (p) == loop->top + && ((NEXT_INSN (NEXT_INSN (p)) == loop->end + && any_uncondjump_p (p)) + || (NEXT_INSN (p) == loop->end + && any_condjump_p (p)))))) { rtx label = 0; |