diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/combine.c | 17 |
2 files changed, 21 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6c03cee..88df7ab 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2018-01-31 Uros Bizjak <ubizjak@gmail.com> + + PR rtl-optimization/84123 + * combine.c (change_zero_ext): Check if hard register satisfies + can_change_dest_mode before calling gen_lowpart_SUBREG. + 2018-01-31 Vladimir Makarov <vmakarov@redhat.com> PR target/82444 diff --git a/gcc/combine.c b/gcc/combine.c index b14b248..970dd26 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -11480,8 +11480,15 @@ change_zero_ext (rtx pat) gen_int_shift_amount (inner_mode, start)); else x = XEXP (x, 0); + if (mode != inner_mode) - x = gen_lowpart_SUBREG (mode, x); + { + if (HARD_REGISTER_P (x) + && !can_change_dest_mode (x, 0, mode)) + continue; + + x = gen_lowpart_SUBREG (mode, x); + } } else if (GET_CODE (x) == ZERO_EXTEND && GET_CODE (XEXP (x, 0)) == SUBREG @@ -11493,7 +11500,13 @@ change_zero_ext (rtx pat) size = GET_MODE_PRECISION (inner_mode); x = SUBREG_REG (XEXP (x, 0)); if (GET_MODE (x) != mode) - x = gen_lowpart_SUBREG (mode, x); + { + if (HARD_REGISTER_P (x) + && !can_change_dest_mode (x, 0, mode)) + continue; + + x = gen_lowpart_SUBREG (mode, x); + } } else if (GET_CODE (x) == ZERO_EXTEND && REG_P (XEXP (x, 0)) |