diff options
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index b0cf3bb..ccf9216 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -6601,20 +6601,21 @@ simplify_subreg (machine_mode outermode, rtx op, return NULL_RTX; } - /* Return X for - (subreg (vec_merge (vec_duplicate X) + /* Simplify + (subreg (vec_merge (X) (vector) (const_int ((1 << N) | M))) - (N * sizeof (X))) + (N * sizeof (outermode))) + to + (subreg (X) (N * sizeof (outermode))) */ unsigned int idx; if (constant_multiple_p (byte, GET_MODE_SIZE (outermode), &idx) && GET_CODE (op) == VEC_MERGE - && GET_CODE (XEXP (op, 0)) == VEC_DUPLICATE - && GET_MODE (XEXP (XEXP (op, 0), 0)) == outermode + && GET_MODE_INNER (innermode) == outermode && CONST_INT_P (XEXP (op, 2)) && (UINTVAL (XEXP (op, 2)) & (HOST_WIDE_INT_1U << idx)) != 0) - return XEXP (XEXP (op, 0), 0); + return simplify_gen_subreg (outermode, XEXP (op, 0), innermode, byte); /* A SUBREG resulting from a zero extension may fold to zero if it extracts higher bits that the ZERO_EXTEND's source bits. */ |