diff options
Diffstat (limited to 'gcc/loop-iv.c')
| -rw-r--r-- | gcc/loop-iv.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c index 83c3eef..6a59954 100644 --- a/gcc/loop-iv.c +++ b/gcc/loop-iv.c @@ -1384,24 +1384,23 @@ simple_rhs_p (rtx rhs) static rtx find_single_def_src (unsigned int regno) { - df_ref adef; - rtx set, src; + rtx src = NULL_RTX; - for (;;) + /* Don't look through unbounded number of single definition REG copies, + there might be loops for sources with uninitialized variables. */ + for (int cnt = 0; cnt < 128; cnt++) { - rtx note; - adef = DF_REG_DEF_CHAIN (regno); + df_ref adef = DF_REG_DEF_CHAIN (regno); if (adef == NULL || DF_REF_NEXT_REG (adef) != NULL || DF_REF_IS_ARTIFICIAL (adef)) return NULL_RTX; - set = single_set (DF_REF_INSN (adef)); + rtx set = single_set (DF_REF_INSN (adef)); if (set == NULL || !REG_P (SET_DEST (set)) || REGNO (SET_DEST (set)) != regno) return NULL_RTX; - note = find_reg_equal_equiv_note (DF_REF_INSN (adef)); - + rtx note = find_reg_equal_equiv_note (DF_REF_INSN (adef)); if (note && function_invariant_p (XEXP (note, 0))) { src = XEXP (note, 0); |