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From-SVN: r279813
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From-SVN: r267494
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r254296 added support for (const ...) wrappers around vectors,
but in the end the agreement was to use a variable-length
encoding of CONST_VECTOR (and VECTOR_CST) instead. This patch
therefore reverts the bits that are no longer needed.
The rtl.texi part isn't a full revert, since r254296 also updated the
documentation to mention unspecs in address calculations, and to relax
the requirement that the mode had to be Pmode.
2018-01-10 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
* doc/rtl.texi: Remove documentation of (const ...) wrappers
for vectors, as a partial revert of r254296.
* rtl.h (const_vec_p): Delete.
(const_vec_duplicate_p): Don't test for vector CONSTs.
(unwrap_const_vec_duplicate, const_vec_series_p): Likewise.
* expmed.c (make_tree): Likewise.
Revert:
* common.md (E, F): Use CONSTANT_P instead of checking for
CONST_VECTOR.
* emit-rtl.c (gen_lowpart_common): Use const_vec_p instead of
checking for CONST_VECTOR.
From-SVN: r256421
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From-SVN: r256169
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This patch allows (const ...) wrappers to be used for rtx vector
constants, as an alternative to const_vector. This is useful
for SVE, where the number of elements isn't known until runtime.
It could also be useful in future for fixed-length vectors, to
reduce the amount of memory needed to represent simple constants
with high element counts. However, one nice thing about keeping
it restricted to variable-length vectors is that there is never
any need to handle combinations of (const ...) and CONST_VECTOR.
2017-11-01 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* doc/rtl.texi (const): Update description of address constants.
Say that vector constants are allowed too.
* common.md (E, F): Use CONSTANT_P instead of checking for
CONST_VECTOR.
* emit-rtl.c (gen_lowpart_common): Use const_vec_p instead of
checking for CONST_VECTOR.
* expmed.c (make_tree): Use build_vector_from_val for a CONST
VEC_DUPLICATE.
* expr.c (expand_expr_real_2): Check for vector modes instead
of checking for CONST_VECTOR.
* rtl.h (const_vec_p): New function.
(const_vec_duplicate_p): Check for a CONST VEC_DUPLICATE.
(unwrap_const_vec_duplicate): Handle them here too.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r254296
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From-SVN: r243994
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From-SVN: r232055
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From-SVN: r219188
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gcc/
* common.md: New file.
* doc/md.texi: Update description of generic, machine-independent
constraints.
* config/s390/constraints.md (e): Delete.
* Makefile.in (md_file): Include common.md.
* config/m32c/t-m32c (md_file): Likewise.
* genpreds.c (general_mem): New array.
(generic_constraint_letters): Remove constraints now defined by
common.md.
(add_constraint): Map TARGET_MEM_CONSTRAINT to general_mem.
Allow the first character to be '<' or '>' as well.
* genoutput.c (general_mem): New array.
(indep_constraints): Remove constraints now defined by common.md.
(note_constraint): Map TARGET_MEM_CONSTRAINT to general_mem.
Remove special handling of 'm'.
* ira-costs.c (record_reg_classes): Remove special handling of
constraints now defined by common.md.
* ira.c (ira_setup_alts, ira_get_dup_out_num): Likewise.
* ira-lives.c (single_reg_class): Likewise.
(ira_implicitly_set_insn_hard_regs): Likewise.
* lra-constraints.c (reg_class_from_constraints): Likewise.
(process_alt_operands, process_address, curr_insn_transform): Likewise.
* postreload.c (reload_cse_simplify_operands): Likewise.
* reload.c (push_secondary_reload, scratch_reload_class)
(find_reloads, alternative_allows_const_pool_ref): Likewise.
* reload1.c (maybe_fix_stack_asms): Likewise.
* targhooks.c (default_secondary_reload): Likewise.
* stmt.c (parse_output_constraint): Likewise.
* recog.c (preprocess_constraints): Likewise.
(constrain_operands, peep2_find_free_register): Likewise.
(asm_operand_ok): Likewise, but add a comment saying why 'o'
must be handled specially.
From-SVN: r211475
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