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| author | Uros Bizjak <ubizjak@gmail.com> | 2021-05-18 15:45:54 +0200 |
|---|---|---|
| committer | Uros Bizjak <ubizjak@gmail.com> | 2021-05-18 15:46:32 +0200 |
| commit | d39fbed75810fc7478842503ecb0268b85dc9c2e (patch) | |
| tree | cab63b7dda8c3365ef476bd78120dd8ab8a43d62 | |
| parent | d3a0208e433dc5aed7ef8deab8d74b6da55e1985 (diff) | |
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i386: Fix split_double_mode with paradoxical subreg [PR100626]
split_double_mode calls simplify_gen_subreg, which fails for the
high half of the paradoxical subreg. Return temporary register
instead of NULL RTX in this case.
2021-05-18 Uroš Bizjak <ubizjak@gmail.com>
gcc/
PR target/100626
* config/i386/i386-expand.c (split_double_mode): Return
temporary register when simplify_gen_subreg fails with
the high half od the paradoxical subreg.
| -rw-r--r-- | gcc/config/i386/i386-expand.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c index 0fa8d45..9f3d419 100644 --- a/gcc/config/i386/i386-expand.c +++ b/gcc/config/i386/i386-expand.c @@ -154,9 +154,13 @@ split_double_mode (machine_mode mode, rtx operands[], lo_half[num] = simplify_gen_subreg (half_mode, op, GET_MODE (op) == VOIDmode ? mode : GET_MODE (op), 0); - hi_half[num] = simplify_gen_subreg (half_mode, op, - GET_MODE (op) == VOIDmode - ? mode : GET_MODE (op), byte); + + rtx tmp = simplify_gen_subreg (half_mode, op, + GET_MODE (op) == VOIDmode + ? mode : GET_MODE (op), byte); + /* simplify_gen_subreg will return NULL RTX for the + high half of the paradoxical subreg. */ + hi_half[num] = tmp ? tmp : gen_reg_rtx (half_mode); } } } |