diff options
Diffstat (limited to 'gcc-4.8/gcc/loop-iv.c')
| -rw-r--r-- | gcc-4.8/gcc/loop-iv.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc-4.8/gcc/loop-iv.c b/gcc-4.8/gcc/loop-iv.c index be2e0f412..4c34007b4 100644 --- a/gcc-4.8/gcc/loop-iv.c +++ b/gcc-4.8/gcc/loop-iv.c @@ -425,7 +425,9 @@ iv_subreg (struct rtx_iv *iv, enum machine_mode mode) && !iv->first_special) { rtx val = get_iv_value (iv, const0_rtx); - val = lowpart_subreg (mode, val, iv->extend_mode); + val = lowpart_subreg (mode, val, + iv->extend == IV_UNKNOWN_EXTEND + ? iv->mode : iv->extend_mode); iv->base = val; iv->extend = IV_UNKNOWN_EXTEND; @@ -465,8 +467,14 @@ iv_extend (struct rtx_iv *iv, enum iv_extend_code extend, enum machine_mode mode && !iv->first_special) { rtx val = get_iv_value (iv, const0_rtx); + if (iv->extend_mode != iv->mode + && iv->extend != IV_UNKNOWN_EXTEND + && iv->extend != extend) + val = lowpart_subreg (iv->mode, val, iv->extend_mode); val = simplify_gen_unary (iv_extend_to_rtx_code (extend), mode, - val, iv->extend_mode); + val, + iv->extend == extend + ? iv->extend_mode : iv->mode); iv->base = val; iv->extend = IV_UNKNOWN_EXTEND; iv->mode = iv->extend_mode = mode; |