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Extension: Zce #113

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@a4lg a4lg commented Jul 29, 2023

@a4lg a4lg force-pushed the riscv-zce branch 3 times, most recently from 867db74 to 1c012c2 Compare August 3, 2023 00:07
@a4lg a4lg added the enhancement New feature or request label Aug 3, 2023
@a4lg a4lg force-pushed the riscv-zce branch 7 times, most recently from 15f7cdb to f5601c7 Compare August 8, 2023 04:11
@a4lg a4lg force-pushed the riscv-zce branch 3 times, most recently from cd8ce76 to 053288b Compare August 15, 2023 06:37
@a4lg a4lg force-pushed the riscv-zce branch 4 times, most recently from 5081148 to 0b4ac5e Compare September 7, 2023 09:35
@a4lg a4lg force-pushed the riscv-zce branch 2 times, most recently from da0e00d to b3b77b8 Compare October 19, 2023 03:17
a4lg added 3 commits October 19, 2023 06:58
@a4lg
RISC-V: Base for complex extension implications
e4d4e27 
Thanks to the commit 48558a5 ("RISC-V: Allow nested implications for
extensions"), we can write complex extension implications in theory.
However, to actually do that, we need to pass more information to
check_func.

For example, we want to imply 'Zcf' from 'F' if and only if the 'Zce'
extension is also enabled and XLEN is 32.  Passing rps is a way to
enable this.

This commit prepares for such complex extension implications.

bfd/ChangeLog:

	* elfxx-riscv.c (struct riscv_implicit_subset): Move around and
	change check_func function prototype.
	(check_implicit_always): New arguments.
	(check_implicit_for_i): Likewise.
	(riscv_implicit_subsets): Add comment for this variable.
	(riscv_parse_add_implicit_subsets): Call check_func with
	new arguments.
@a4lg
MOCK: RISC-V: Add 'Zce' extension support
cad45cd 
It adds a support for the 'Zce' superset compressed instruction extension
for embedded systems.

**THIS IS A MOCKUP**

Since 'Zcmp' and 'Zcmt' are not added to GNU Binutils yet, this commit is
just a mockup.  However, it outlines what will be required on the 'Zce'
support along with new complex implication design.

bfd/ChangeLog:

	* elfxx-riscv.c (check_implicit_for_f_zce): New function to check
	whether adding implication 'F' -> 'Zcf' is appropriate.
	(riscv_implicit_subsets): Add conditional implication from 'F'
	-> 'Zcf'.  (riscv_supported_std_z_ext): [MOCK] Add 'Zce' to the
	supported 'Z' extension list.
@a4lg
MOCK: RISC-V: Tests for 'Zce' implications
7dd9c0b 
**NEVER COMMIT THIS.**

This commit is intended to be merged to the previous patch once 'Zcmp'
and 'Zcmt' extensions are ready.

It adds several tests related to 'Zce' implications.

bfd/ChangeLog:

	* elfxx-riscv.c: [MOCK] Uncomment mock lines to pass the test.

gas/ChangeLog:

	* testsuite/gas/riscv/march-imply-zce.d: New test.
	* testsuite/gas/riscv/march-imply-zce-f-32.d: Likewise.
	* testsuite/gas/riscv/march-imply-zce-f-64.d: Likewise.
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