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| author | Richard Sandiford <richard.sandiford@arm.com> | 2016-05-02 09:39:38 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2016-05-02 09:39:38 +0000 |
| commit | 8de73453a42758af02bb23ed58f4b1e78ad11bc7 (patch) | |
| tree | ea2f8d60c73117cebcd97dfbc56bb80d7c4ee632 /gcc/fold-const.c | |
| parent | 032c80e999eac4288ff1b0f752e15c8e7c5cdf51 (diff) | |
| download | gcc-8de73453a42758af02bb23ed58f4b1e78ad11bc7.zip gcc-8de73453a42758af02bb23ed58f4b1e78ad11bc7.tar.gz gcc-8de73453a42758af02bb23ed58f4b1e78ad11bc7.tar.bz2 | |
Support << and >> for offset_int and widest_int
Following on from the comparison patch, I think it makes sense to
support << and >> for offset_int (int128_t) and widest_int (intNNN_t),
with >> being arithmetic shift. It doesn't make sense to use
logical right shift on a potentially negative offset_int, since
the precision of 128 bits has no meaning on the target.
Tested on x86_64-linux-gnu and aarch64-linux-gnu.
gcc/
* wide-int.h: Update offset_int and widest_int documentation.
(WI_SIGNED_SHIFT_RESULT): New macro.
(wi::binary_shift): Define signed_shift_result_type for
shifts on offset_int- and widest_int-like types.
(generic_wide_int): Support <<= and >>= if << and >> are supported.
* tree.h (int_bit_position): Use shift operators instead of wi::
shifts.
* alias.c (adjust_offset_for_component_ref): Likewise.
* expr.c (get_inner_reference): Likewise.
* fold-const.c (fold_comparison): Likewise.
* gimple-fold.c (fold_nonarray_ctor_reference): Likewise.
* gimple-ssa-strength-reduction.c (restructure_reference): Likewise.
* tree-dfa.c (get_ref_base_and_extent): Likewise.
* tree-ssa-alias.c (indirect_ref_may_alias_decl_p): Likewise.
(stmt_kills_ref_p): Likewise.
* tree-ssa-ccp.c (bit_value_binop_1): Likewise.
* tree-ssa-math-opts.c (find_bswap_or_nop_load): Likewise.
* tree-ssa-sccvn.c (copy_reference_ops_from_ref): Likewise.
(ao_ref_init_from_vn_reference): Likewise.
gcc/cp/
* init.c (build_new_1): Use shift operators instead of wi:: shifts.
From-SVN: r235720
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 4aa2412..8ece0f8 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -8521,7 +8521,7 @@ fold_comparison (location_t loc, enum tree_code code, tree type, { offset_int tem = wi::sext (wi::to_offset (offset0), TYPE_PRECISION (sizetype)); - tem = wi::lshift (tem, LOG2_BITS_PER_UNIT); + tem <<= LOG2_BITS_PER_UNIT; tem += bitpos0; if (wi::fits_shwi_p (tem)) { @@ -8568,7 +8568,7 @@ fold_comparison (location_t loc, enum tree_code code, tree type, { offset_int tem = wi::sext (wi::to_offset (offset1), TYPE_PRECISION (sizetype)); - tem = wi::lshift (tem, LOG2_BITS_PER_UNIT); + tem <<= LOG2_BITS_PER_UNIT; tem += bitpos1; if (wi::fits_shwi_p (tem)) { |