This patch adds VLS modes to the strided load expanders.

gcc/ChangeLog:

	* config/riscv/autovec.md: Add VLS modes.
	* config/riscv/vector-iterators.md: Ditto.
	* config/riscv/vector.md: Ditto.

This patch adds else operands to masked loads.  Currently the default
else operand predicate just accepts "undefined" (i.e. SCRATCH) values.

	PR middle-end/115336
	PR middle-end/116059

gcc/ChangeLog:

	* config/riscv/autovec.md: Add else operand.
	* config/riscv/predicates.md (maskload_else_operand): New
	predicate.
	* config/riscv/riscv-v.cc (get_else_operand): Remove static.
	(expand_load_store): Use get_else_operand and adjust index.
	(expand_gather_scatter): Ditto.
	(expand_lanes_load_store): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/pr115336.c: New test.
	* gcc.target/riscv/rvv/autovec/pr116059.c: New test.

gcc/ChangeLog:

	* config/i386/sse.md (maskload<mode><sseintvecmodelower>):
	Call maskload<mode>..._1.
	(maskload<mode><sseintvecmodelower>_1): Rename.

This patch adds an undefined else operand to the masked loads.

gcc/ChangeLog:

	* config/gcn/predicates.md (maskload_else_operand): New
	predicate.
	* config/gcn/gcn-valu.md: Use new predicate.

This adds zero else operands to masked loads and their intrinsics.
I needed to adjust more than initially thought because we rely on
combine for several instructions and a change in a "base" pattern
needs to propagate to all those.

gcc/ChangeLog:

	* config/aarch64/aarch64-sve-builtins-base.cc: Add else
	handling.
	* config/aarch64/aarch64-sve-builtins.cc (function_expander::use_contiguous_load_insn):
	Ditto.
	* config/aarch64/aarch64-sve-builtins.h: Add else operand to
	contiguous load.
	* config/aarch64/aarch64-sve.md (@aarch64_load<SVE_PRED_LOAD:pred_load>
	_<ANY_EXTEND:optab><SVE_HSDI:mode><SVE_PARTIAL_I:mode>):
	Split and add else operand.
	(@aarch64_load_<ANY_EXTEND:optab><SVE_HSDI:mode><SVE_PARTIAL_I:mode>):
	Ditto.
	(*aarch64_load_<ANY_EXTEND:optab>_mov<SVE_HSDI:mode><SVE_PARTIAL_I:mode>):
	Ditto.
	* config/aarch64/aarch64-sve2.md: Ditto.
	* config/aarch64/iterators.md: Remove unused iterators.
	* config/aarch64/predicates.md (aarch64_maskload_else_operand):
	Add zero else operand.

This patch adds an else operand to vectorized masked load calls.
The current implementation adds else-value arguments to the respective
target-querying functions that is used to supply the vectorizer with the
proper else value.

We query the target for its supported else operand and uses that for the
maskload call.  If necessary, i.e. if the mode has padding bits and if
the else operand is nonzero, a VEC_COND enforcing a zero else value is
emitted.

gcc/ChangeLog:

	* optabs-query.cc (supports_vec_convert_optab_p): Return icode.
	(get_supported_else_val): Return supported else value for
	optab's operand at index.
	(supports_vec_gather_load_p): Add else argument.
	(supports_vec_scatter_store_p): Ditto.
	* optabs-query.h (supports_vec_gather_load_p): Ditto.
	(get_supported_else_val): Ditto.
	* optabs-tree.cc (target_supports_mask_load_store_p): Ditto.
	(can_vec_mask_load_store_p): Ditto.
	(target_supports_len_load_store_p): Ditto.
	(get_len_load_store_mode): Ditto.
	* optabs-tree.h (target_supports_mask_load_store_p): Ditto.
	(can_vec_mask_load_store_p): Ditto.
	* tree-vect-data-refs.cc (vect_lanes_optab_supported_p): Ditto.
	(vect_gather_scatter_fn_p): Ditto.
	(vect_check_gather_scatter): Ditto.
	(vect_load_lanes_supported): Ditto.
	* tree-vect-patterns.cc (vect_recog_gather_scatter_pattern):
	Ditto.
	* tree-vect-slp.cc (vect_get_operand_map): Adjust indices for
	else operand.
	(vect_slp_analyze_node_operations): Skip undefined else operand.
	* tree-vect-stmts.cc (exist_non_indexing_operands_for_use_p):
	Add else operand handling.
	(vect_get_vec_defs_for_operand): Handle undefined else operand.
	(check_load_store_for_partial_vectors): Add else argument.
	(vect_truncate_gather_scatter_offset): Ditto.
	(vect_use_strided_gather_scatters_p): Ditto.
	(get_group_load_store_type): Ditto.
	(get_load_store_type): Ditto.
	(vect_get_mask_load_else): Ditto.
	(vect_get_else_val_from_tree): Ditto.
	(vect_build_one_gather_load_call): Add zero else operand.
	(vectorizable_load): Use else operand.
	* tree-vectorizer.h (vect_gather_scatter_fn_p): Add else
	argument.
	(vect_load_lanes_supported): Ditto.
	(vect_get_mask_load_else): Ditto.
	(vect_get_else_val_from_tree): Ditto.

When predicating a load we implicitly assume that the else value is
zero.  This matters in case the loaded value is padded (like e.g.
a Bool) and we must ensure that the padding bytes are zero on targets
that don't implicitly zero inactive elements.

A former version of this patch still had this handling in ifcvt but
the latest version defers it to the vectorizer.

gcc/ChangeLog:

	* tree-if-conv.cc (predicate_load_or_store): Add zero else
	operand and comment.

This patch adds else-operand handling to the internal functions.

gcc/ChangeLog:

	* internal-fn.cc (add_mask_and_len_args): Rename...
	(add_mask_else_and_len_args): ...to this and add else handling.
	(expand_partial_load_optab_fn): Use adjusted function.
	(expand_partial_store_optab_fn): Ditto.
	(expand_scatter_store_optab_fn): Ditto.
	(expand_gather_load_optab_fn): Ditto.
	(internal_fn_len_index): Add else handling.
	(internal_fn_else_index): Ditto.
	(internal_fn_mask_index): Ditto.
	(get_supported_else_vals): New function.
	(supported_else_val_p): New function.
	(internal_gather_scatter_fn_supported_p): Add else operand.
	* internal-fn.h (internal_gather_scatter_fn_supported_p): Define
	else constants.
	(MASK_LOAD_ELSE_ZERO): Ditto.
	(MASK_LOAD_ELSE_M1): Ditto.
	(MASK_LOAD_ELSE_UNDEFINED): Ditto.
	(get_supported_else_vals): Declare.
	(supported_else_val_p): Ditto.

This patch amends the documentation for masked loads (maskload,
vec_mask_load_lanes, and mask_gather_load as well as their len
counterparts) with an else operand.

gcc/ChangeLog:

	* doc/md.texi: Document masked load else operand.

libgomp/ChangeLog:

	PR libgomp/117626
	* plugin/plugin-nvptx.c (nvptx_open_device): Use 'CUDA_CALL_ERET'
	with 'NULL' as error return instead of 'CUDA_CALL' that returns false.

For pointers I forgot that BIT_IOR_EXPR is not valid so when
I added the pattern to convert `max<a,b> != 0` (r15-5356), GCC
would start to ICEing saying pointer types were not valid for
BIT_IOR_EXPR.
This fixes the problem by casting to the unsigned type of the
inner type. There was another way of fixing this to handling it
as `a == 0 & b == 0` but both match and reassoication (for pointers)
will then convert it back into the form I am creating here so
let's just use that form instead.

Bootstrapped and tested on x86_64-linux-gnu.

	PR tree-optimization/117646

gcc/ChangeLog:

	* match.pd (`max<a,b>==0`): Add casts to `unsigned type`.

gcc/testsuite/ChangeLog:

	* gcc.dg/torture/minmaxneeqptr-1.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

François pointed out that static_cast<__node_ptr>(&_M_before_begin) is
invalid, because _M_before_begin is only a node-base not a node.

Refactor the new merge overloads to only cast when we know we have a
valid node.

He also pointed out some optimizations to allow reusing hash codes that
might be cached in the node. The _M_src_hash_code function already has
the right logic to decide when a cached hash code can be reused by a
different _Hashtable object.

libstdc++-v3/ChangeLog:

	* include/bits/hashtable.h (_Hashtable::_M_src_hash_code):
	Improve comments.
	(_Hashtable::_M_merge_unique(_Hashtable&)): Use pointer_traits
	to get before-begin pointer. Only use static_cast on valid
	nodes, not the before-begin pointer. Reuse a hash code cached in
	the node when possible.
	(_Hashtable::_M_merge_multi(_Hashtable&)): Likewise.

Reviewed-by: François Dumont <fdumont@gcc.gnu.org>

The dependency output for header unit modules is based on the absolute
pathname of the header file, but that's not something that a makefile can
portably refer to.  This patch adds a .c++-header-unit target based on the
header name relative to an element of the include path.

libcpp/ChangeLog:

	* internal.h (_cpp_get_file_dir): Declare.
	* files.cc (_cpp_get_file_dir): New fn.
	* mkdeps.cc (make_write): Use it.

gcc/testsuite/ChangeLog:

	* g++.dg/modules/dep-4.H: New test.

Instead of doing a dg-run with a specific target check for linux.
Use signal as the effective-target since this requires the use
of ALARM signal to do the testing.
Also use check_vect in the main and renames main to main1 to make sure
we don't use the registers.

Tested on x86_64-linux-gnu.

	PR testsuite/117494
gcc/testsuite/ChangeLog:

	* gcc.dg/vect/pr101145inf.c: Remove dg-do and replace
	with dg-require-effective-target of signal.
	* gcc.dg/vect/pr101145inf_1.c: Likewise.
	* gcc.dg/vect/pr101145inf.inc: Rename main to main1
	and mark as noinline.
	Include tree-vect.h. Have main call check_vect and main1.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

libstdc++-v3:
	* doc/xml/manual/allocator.xml: Update reference to Angelika
	Langer's article.
	* doc/html/manual/memory.html: Regenerate.

I was looking at a regression in ext-dce's behavior just before Cauldron.
Essentially a bugfix in ext-dce ended up causing us to fail to eliminate some
useless extensions.

When we have a SUBREG object with SUBREG_PROMOTED_VAR* flags set, we generally
have to be more conservative in how we process bit group liveness, making bits
live that wouldn't obviously be live otherwise.

That's not always necessary though. For example, if we're storing a promoted
subreg into memory, we may not care about those extra live bits on this
instance of the subreg object (remember subregs are not shared!).  Essentially
if the mode of the memory reference is not wider than the mode of the inner
REG, then we can clear the promoted state which in turn may allow more
extension elimination.

So at the start of ext-dce we do a simple pass over the IL and remove promoted
subreg state when it's obviously safe to do so (memory stores when the modes
allow it).  That prevents extra bits from being live and ultimately allows us
to remove more useless extensions.

The testcase is in theory generic, but many targets won't have an opportunity
to optimize this case.  So rather then build out a large inclusion/exclusion
list, I've just made the test risc-v specific.

Bootstrapped and regression tested on aarch64, riscv64, s390x, etc in my tester.

gcc/
	* ext-dce.cc (maybe_clear_subreg_promoted_p): New function.
	(ext_dce_execute): Call it.

gcc/testsuite
	* gcc.target/riscv/ext-dce-1.c: New test.

Remove stray `;;' from the middle of the introductory comment for the
"unaligned_store<mode>" expander, clearly a leftover from a previous
edition.

	gcc/
	* config/alpha/alpha.md (unaligned_store<mode>): Remove stray
	`;;'.

2024-11-17  John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog:

	PR target/69374
	* doc/install.texi (Specific) <hppa*-hp-hpux11>: Update anchor
	and heading to reflect removal of 32-bit hppa support on HP-UX.
	Trim 32-bit related text.

This should have been part of r15-5367.  One day I'll remember to do this
before buildbot sends me hate mail.

gcc/c-family/ChangeLog:

	* c.opt.urls: Regenerate.

In C23, bool is now a keyword.  So, doing a typedef for it is invalid.

2024-11-17  John David Anglin  <danglin@gcc.gnu.org>

libgcc/ChangeLog:

	PR target/117627
	* config/pa/linux-atomic.c: Remove typedef for bool type.

This warning covers the C23 incompibilities resulting from using
() as parameter lists in function declarations.

The warning name comes from Clang.  The implementation is not
perfect because GCC treats these two declarations as equivalent:

  void f ();
  void f (not_a_type);

This is a bit confusing because they are clearly visually distinct.
However, as of GCC 14, the second form is an error by default, so
treating both the same as far as  -Wdeprecated-non-prototype does
not seem so bad from a user experience view.

gcc/c-family/

	PR c/95445
	* c-opts.cc (c_common_post_options): Initialize
	warn_deprecated_non_prototype.
	* c.opt (Wdeprecated-non-prototype): New option.
	* c.opt.urls: Regenerate.

gcc/c/

	PR c/95445
	* c-decl.cc (start_function): Warn about parameters
	after parameter-less declaration.
	* c-typeck.cc (build_function_call_vec): Pass fntype
	to convert_arguments.
	(convert_arguments): Change argument to fntype and
	compute typelist.  Warn about parameter list mismatches
	on first parameter.

gcc/

	PR c/95445
	* doc/invoke.texi: Document -Wdeprecated-non-prototype.

gcc/testsuite/

	PR c/95445
	* gcc.dg/Wdeprecated-non-prototype-1.c: New test.
	* gcc.dg/Wdeprecated-non-prototype-2.c: New test.
	* gcc.dg/Wdeprecated-non-prototype-3.c: New test.
	* gcc.dg/Wdeprecated-non-prototype-4.c: New test.

While experimenting with testing module std I noticed that gcc -M broke on
it; it seems I need to set directives_only even sooner than I did in
r15-4219.

gcc/c-family/ChangeLog:

	* c-ppoutput.cc (preprocess_file): Don't set directives_only here.

gcc/cp/ChangeLog:

	* module.cc (module_preprocess_options): Set directives_only here.

The C++ modules code has a -fmodule-header (or -x c++-{user,system}-header)
option to specify looking up headers to compile to header units on the usual
include paths.  I'd like to have the same functionality for full C++20
modules such as module std, which I proposed to live on the include path at
bits/std.cc.  But this behavior doesn't seem necessarily connected to
modules, so I'm proposing a general C/C++ option to specify the behavior of
looking in the include path for the input files specified on the command
line.

Other ideas for the name of the option are very welcome.

The libcpp change is to allow -fsearch-include-path{,=user} to find files in
the current working directory, like -include.  This can be handy for a quick
compile of both std.cc and a file that imports it, e.g.

g++ -std=c++20 -fmodules -fsearch-include-path bits/std.cc importer.cc

gcc/ChangeLog:

	* doc/cppopts.texi: Document -fsearch-include-path.
	* doc/invoke.texi: Mention it for modules.

gcc/c-family/ChangeLog:

	* c.opt: Add -fsearch-include-path.
	* c-opts.cc (c_common_post_options): Handle it.

gcc/cp/ChangeLog:

	* module.cc (module_preprocess_options): Don't override it.

libcpp/ChangeLog:

	* internal.h (search_path_head): Declare.
	* files.cc (search_path_head): No longer static.
	* init.cc (cpp_read_main_file): Use it.

This patch introduces an installed source form of module std and std.compat.
To help a build system find them, we install a libstdc++.modules.json file
alongside libstdc++.so, which tells the build system where the files are and
any special flags it should use when compiling them (none, in this case).
The format is from a proposal in SG15.  The build system can find this file
with 'gcc -print-file-name=libstdc++.modules.json'.

It seems preferable to use a relative path from this file to the sources so
that moving the installation doesn't break the reference, but I didn't see
any obvious way to compute that without relying on coreutils, perl, or
python, so I wrote a POSIX shell script for it.  The .. canonicalization
bits aren't necessary since I discovered $(abspath), but I guess I might as
well leave them in.

Currently this installs the sources under $(gxx_include_dir)/bits/,
i.e. /usr/include/c++/15/bits.  So with my -fsearch-include-path change,
std.cc can be compiled with g++ -fsearch-include-path bits/std.cc.  Note
that if someone actually tries to #include <bits/std.cc> it will fail with
"error: module control-line cannot be in included file".

Any ideas about a more user-friendly way to express "compile module std" are
welcome.

The sources currently have the extension .cc, like other source files.

std.cc started with m.cencora's implementation in PR114600.  I've made some
adjustments, but more is probably desirable, e.g. of the <algorithm>
handling of namespace ranges, and to remove exports of templates that are
only specialized in a particular header.  I've filled in a bunch of missing
exports, and added some FIXMEs where I noticed bits that are not implemented
yet.

Since bits/stdc++.h also intends to include the whole standard library, I
include it rather than duplicate it.  But stdc++.h comments out <execution>,
due to TBB issues; I include it separately and suppress TBB usage, so module
std won't currently provide parallel execution.

It seemed most convenient for the two files to be monolithic so we don't
need to worry about include paths.  So the C library names that module
std.compat exports in both namespace std and :: are a block of code that is
appended to both files, adjusted based on whether the macro STD_COMPAT is
defined before the block.

In this implementation std.compat imports std; it would also be valid for it
to duplicate everything in std.  I see the libc++ std.compat also imports
std.

As discussed in the PR, module std is supported in C++20 mode even though it
was added in C++23.

Changes to test module std will follow in a separate patch.  In my testing
I've noticed a few compiler bugs that break various testcases, so I don't
expect to enable module std testing by default at first.

	PR libstdc++/106852

libstdc++-v3/ChangeLog:

	* include/bits/version.def: Add __cpp_lib_modules.
	* include/bits/version.h: Regenerate.
	* src/c++23/Makefile.am: Add modules std and std.compat.
	* src/c++23/Makefile.in: Regenerate.
	* src/c++23/std-clib.cc.in: New file.
	* src/c++23/std.cc.in: New file.
	* src/c++23/std.compat.cc.in: New file.
	* src/c++23/libstdc++.modules.json.in: New file.

contrib/ChangeLog:

	* relpath.sh: New file.

I forgot to mark asm statements as necessary in ipa-fnsummary. This should
mask failure of gcc.dg/guality/pr36728-2.c where the patch enabled
cloning which breaks debug info.

gcc/ChangeLog:

	* ipa-fnsummary.cc (find_necessary_statements): ASM statements are
	necessary.

libstdc++-v3:
	* doc/xml/manual/intro.xml: Move a gcc.gnu.org link to https.
	* doc/html/manual/license.html: Regenerate.

libstdc++-v3:
	* doc/xml/manual/io.xml: Update link to Angelika Langer's book.
	* doc/html/manual/streambufs.html: Regenerate.

C attributes reproducible and unsequenced implies that calling function twice
leads to same effect if parameters are otherwise unchanged (function call
itself does not count).  This is bit bit stronger that modref's notion of
nondeterminism that says that same inputs will yield same outputs (function
call itself does count).

This patch makes reproducible/unsequenced imply determinism and cleans up
determinism handling.  By itself it is not useful, since we can not make use of it
unless we know what are the inputs/outputs of the function which I plan to handle
by the "fn spec" attribute.

gcc/ChangeLog:

	* ipa-modref.cc (modref_summary::useful_p): const/pure implies
	determinism.
	(modref_summary_lto::useful_p): Likewise.
	(ignore_nondeterminism_p): Add CALLEE_FNTYPE parameter; check for
	reproducible/unsequenced
	(modref_access_analysis::record_access_p): Use ignore_nondeterminism_p
	when handling volatile accesses.
	(modref_access_analysis::get_access_for_fnspec): Update.
	(modref_access_analysis::process_fnspec): Cleanup handling of NOVOPS.
	(modref_access_analysis::analyze_call): Use ignore_nondeterminism_p
	when handling asm statements.
	(modref_access_analysis::analyze_stmt): Update.
	(propagate_unknown_call): Update.
	(modref_propagate_in_scc): Update.
	(ipa_merge_modref_summary_after_inlining): Update.

This patch makes it clear that vector sizes and capacities are not
negative.  With recent change to ipa-fnsummary this should not affect
inlining and improves codegen of some vector manipulation functions.

I tested clang build.  Looking for throw_bad calls there are only 3
called considerably often (bad_allloc, bad_array_new_length and
function_callv).
The patch seems to reduce bad_alloc and bad_array_new_length calls
considerably:

bad_alloc 380->147
bad_array_new_length 832->128

libstdc++-v3/ChangeLog:

	PR tree-optimization/109442
	* include/bits/stl_vector.h: (vector::size(),
	vector::capacity()): Add __builtin_unreachable call to announce
	that size and capacity are non-negative.

gcc/testsuite/ChangeLog:

	PR tree-optimization/109442
	* g++.dg/tree-ssa/pr109442.C: New test.

while working on -fmalloc-dce I noticed that tree-ssa-dce.cc still has an
outdated list of builtions that are known to not read memory that can be
replaced by query to fnspec and modref.

If I get things right, dce does some dead store removal, but only on those
memory object that are non-aliased (automatic variabels with no address taken)
and for all other memory addresses it resorts to
mark_all_reaching_defs_necessary expecting DSE to do the rest.  So we really
want to only check if there are no memory reads at all rather then trying to
understand them by parsing fnspec or modref summary.

I did run testsuite ensuring that all builtins matched previously are
still matched.  There are few testcases where this check fails, due to
type incompatibility.  New code uses gimple_call_builtin while other
just checked callee_decl.

We test things like calling free() without parmeter which I don't think
we want to care about, but there is also testase declaring

void * calloc (long, long)

where builtin declaration expects unsigned long.  I am not sure if this
case should not be allowed by gimple_call_builtin?

Bootstrappe/regtested x86_64-linux. OK?

gcc/ChangeLog:

	* ipa-modref.cc (ipa_modref_callee_reads_no_memory_p): New function.
	* ipa-modref.h (ipa_modref_callee_reads_no_memory_p): Declare
	* tree-ssa-dce.cc (propagate_necessity): Use it.

gcc/cp/ChangeLog:

	* decl.cc (cxx_build_operator_new): Break out from ...
	(cxx_build_operator_delete): Break out from ...
	(cxx_init_operator_new_delete_decls): Break out from ...
	(cxx_init_decl_processing): ... here.

Since r15-5327, GNU-C23 is being used as C language default.
libf7.h doesn't assume headers like stdbool.h are present
and defines bool, true and false on its own.

libgcc/config/avr/libf7/
	* libf7.h (bool, true, false): Don't define in C23 or higher.

For unsigned types, you can optimize `max<a,b> == 0` into
`(a|b) == 0` (that is both have to be zero). A similar thing happens for `!= 0`.
This optimization fixes the missed optimization (g++.dg/tree-ssa/pr115275.C)
that was reported exposed by adding phiprop early.

Bootstrapped and tested on x86_64-linux-gnu.

	PR tree-optimization/115275

gcc/ChangeLog:

	* match.pd (umax(a,b) ==/!= 0): New pattern.

gcc/testsuite/ChangeLog:

	* g++.dg/tree-ssa/pr115275.C: New test.
	* gcc.dg/tree-ssa/max_eqne-1.c: New test.
	* gcc.dg/tree-ssa/max_eqne-2.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

This patch simplify `min(a,b) op max(a,b)` to `a op b`. This optimization
will work for all the binary commutative operations. So, the `op` here can
be one of {plus, mult, bit_and, bit_xor, bit_ior, eq, ne, min, max}.

	PR tree-optimization/109401

gcc/ChangeLog:

	* match.pd (min(a,b) op max(a,b) -> a op b): New pattern.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/pr109401.c: New test.
	* gcc.dg/tree-ssa/pr109401-1.c: New test.

Signed-off-by: Eikansh Gupta <quic_eikagupt@quicinc.com>

Some of the function definitions used K&R style definitions (but not all).
This just moves them all to be ANSI C

Bootstrapped and tested on x86_64-linux-gnu.

libiberty/ChangeLog:

	* testsuite/test-demangle.c (get_line): Change K&R style
	definition into ANSI C90 definitions.
	(fail): Likewise.
	(main): Likewise.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

This patch avoids (clobber (match_dup)) in insn patterns for tablejump.
The machine description now uses a scratch_operand instead which is
possible since the clobbered entity is known in advance:

3-byte PC        : REG_Z
2-byte PC + JMP  : REG_Z
2-byte PC + RJMP : None, hence scratch:HI is used.

The avr-casesi pass and optimization has to be adjusted to the new patterns.

	PR target/116781
gcc/
	* config/avr/avr.md (*tablejump_split, *tablejump): Add
	operand 2 as a "scratch_operand" instead of a match_dup.
	(casesi): Adjust expander operands accordingly.  Use a scratch:HI
	when the jump address is not clobbered.  This is the case for a
	2-byte PC + has no JMP instruction.  In all the other cases, the
	affected operand is REG_Z (reg:HI 30).
	(casesi_<mode>_sequence): Adjust matcher to new anatomy.
	* config/avr/avr-passes.cc (avr_is_casesi_sequence)
	(avr_is_casesi_sequence, avr_optimize_casesi)
	(avr_casei_sequence_check_operands): Adjust to new anatomy.

	PR target/117500
gcc/
	* config/avr/avr.cc (avr_print_operand) [code = 'i']: Use
	output_operand_lossage on bad operands instead of fatal_insn.

For operations like  X o= CST, regalloc may spill l-reg X to a d-reg:
   D =  X
   D o= CST
   X =  D
where it is better to instead
   D =  CST
   X o= D
This patch adds an according RTL peephole.

gcc/
	* config/avr/avr.md: Add a peephole2 that improves bit operations
	with a lower register and a constant.