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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-12-21 07:02:53 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-12-21 07:02:53 +0000 |
| commit | 8944b5b36e04894f7a0768440e3253400c3c7857 (patch) | |
| tree | 766896dfe4d80dff7d71436e756913e05a53633e /gcc/tree-vect-data-refs.c | |
| parent | a696bc4fec986318a1765c31ac9ee2db3849934a (diff) | |
| download | gcc-8944b5b36e04894f7a0768440e3253400c3c7857.zip gcc-8944b5b36e04894f7a0768440e3253400c3c7857.tar.gz gcc-8944b5b36e04894f7a0768440e3253400c3c7857.tar.bz2 | |
poly_int: compute_data_ref_alignment
This patch makes vect_compute_data_ref_alignment treat DR_INIT as a
poly_int and handles cases in which the calculated misalignment might
not be constant.
2017-12-21 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* tree-vect-data-refs.c (vect_compute_data_ref_alignment):
Treat drb->init as a poly_int. Fail if its misalignment wrt
vector_alignment isn't known.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r255935
Diffstat (limited to 'gcc/tree-vect-data-refs.c')
| -rw-r--r-- | gcc/tree-vect-data-refs.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c index 7d039185..014862a 100644 --- a/gcc/tree-vect-data-refs.c +++ b/gcc/tree-vect-data-refs.c @@ -944,8 +944,8 @@ vect_compute_data_ref_alignment (struct data_reference *dr) DR_VECT_AUX (dr)->base_misaligned = true; base_misalignment = 0; } - unsigned int misalignment = (base_misalignment - + TREE_INT_CST_LOW (drb->init)); + poly_int64 misalignment + = base_misalignment + wi::to_poly_offset (drb->init).force_shwi (); /* If this is a backward running DR then first access in the larger vectype actually is N-1 elements before the address in the DR. @@ -955,7 +955,21 @@ vect_compute_data_ref_alignment (struct data_reference *dr) misalignment += ((TYPE_VECTOR_SUBPARTS (vectype) - 1) * TREE_INT_CST_LOW (drb->step)); - SET_DR_MISALIGNMENT (dr, misalignment & (vector_alignment - 1)); + unsigned int const_misalignment; + if (!known_misalignment (misalignment, vector_alignment, + &const_misalignment)) + { + if (dump_enabled_p ()) + { + dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, + "Non-constant misalignment for access: "); + dump_generic_expr (MSG_MISSED_OPTIMIZATION, TDF_SLIM, ref); + dump_printf (MSG_MISSED_OPTIMIZATION, "\n"); + } + return true; + } + + SET_DR_MISALIGNMENT (dr, const_misalignment); if (dump_enabled_p ()) { |