Relax the ISA string order checking for -march #14
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jim-wilson
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Jun 24, 2021
ebahapo
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Jul 8, 2021
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It should also be specified that the tools always emit the extensions in canonical order. |
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jrtc27
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rjiejie
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kito-cheng
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Apr 25, 2022
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Hi @kito-cheng Would you mind to update the status or progress when available? |
cmuellner
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This is essentially a collection of all recent change requests for the -march string: * Relax the ISA string order ([1]) * Add custom extensions ([2]) * Add profiles support ([3]) Most of this patch is based on proposals from Kito Cheng <[email protected]> (see linked resources below). [1] riscv-non-isa#14 [2] riscv-non-isa#1 [3] https://lists.riscv.org/g/sig-toolchains/message/379 [4] riscv-non-isa#11 Signed-off-by: Christoph Müllner <[email protected]>
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This is essentially a collection of all recent change requests for the -march string: * Relax the ISA string order ([1]) * Add custom extensions ([2]) * Add profiles support ([3]) Most of this patch is based on proposals from Kito Cheng <[email protected]> (see linked resources below). [1] riscv-non-isa#14 [2] riscv-non-isa#1 [3] https://lists.riscv.org/g/sig-toolchains/message/379 [4] riscv-non-isa#11 Signed-off-by: Christoph Müllner <[email protected]>
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This is essentially a collection of all recent change requests for the -march string: * Relax the ISA string order ([1]) * Add custom extensions ([2]) * Add profiles support ([3]) Most of this patch is based on proposals from Kito Cheng <[email protected]> (see linked resources below). [1] riscv-non-isa#14 [2] riscv-non-isa#1 [3] https://lists.riscv.org/g/sig-toolchains/message/379 [4] riscv-non-isa#11 Signed-off-by: Christoph Müllner <[email protected]>
cmuellner
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This is essentially a collection of all recent change requests for the -march string: * Relax the ISA string order ([1]) * Add custom extensions ([2]) * Add profiles support ([3]) Most of this patch is based on proposals from Kito Cheng <[email protected]> (see linked resources below). [1] riscv-non-isa#14 [2] riscv-non-isa#1 [3] https://lists.riscv.org/g/sig-toolchains/message/379 [4] riscv-non-isa#11 Signed-off-by: Christoph Müllner <[email protected]>
cmuellner
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This is essentially a collection of all recent change requests for the -march string: * Relax the ISA string order ([1]) * Add custom extensions ([2]) * Add profiles support ([3]) Most of this patch is based on proposals from Kito Cheng <[email protected]> (see linked resources below). [1] riscv-non-isa#14 [2] riscv-non-isa#1 [3] https://lists.riscv.org/g/sig-toolchains/message/379 [4] riscv-non-isa#11 Signed-off-by: Christoph Müllner <[email protected]>
wangliu-iscas
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* riscv-toolchain-conventions, PR, riscv-non-isa/riscv-toolchain-conventions#14 Issue, riscv-non-isa/riscv-toolchain-conventions#11 * Refer to the commit afc41ff, RISC-V: Reorder the prefixed extensions which are out of order. In the past we only allow to reorder the prefixed extensions. But according to the PR 14 in the riscv-toolchain-convention, we can also relax the order checking to allow the whole extensions be written out of orders, including the single standard extensions and the prefixed multi-letter extensions. Just that we still need to follow the following rules as usual, 1. prefixed extensions need to be seperated with `_'. 2. prefixed extensions need complete <major>.<minor> version if set. Please see the details in the march-ok-reorder gas testcase. Passed the riscv-gnu-toolchain regressions. bfd/ * elfxx-riscv.c (enum riscv_prefix_ext_class): Changed RV_ISA_CLASS_UNKNOWN to RV_ISA_CLASS_SINGLE, since everything that does not belong to the multi-keyword will possible be a single extension for the current parser. (parse_config): Likewise. (riscv_get_prefix_class): Likewise. (riscv_compare_subsets): Likewise. (riscv_parse_std_ext): Removed, and merged with riscv_parse_prefixed_ext into riscv_parse_extensions. (riscv_parse_prefixed_ext): Likewise. (riscv_parse_subset): Only need to call riscv_parse_extensions to parse both single standard and prefixed extensions. gas/ * testsuite/gas/riscv/march-fail-order-std.d: Removed since the relaxed order checking. * testsuite/gas/riscv/march-fail-order-std.l: Likewise. * testsuite/gas/riscv/march-fail-order-x-std.d: Likewise. * testsuite/gas/riscv/march-fail-order-z-std.d: Likewise. * testsuite/gas/riscv/march-fail-order-zx-std.l: Likewise. * testsuite/gas/riscv/march-fail-unknown-std.l: Updated. * testsuite/gas/riscv/march-ok-reorder.d: New testcase.
saagarjha
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* riscv-toolchain-conventions, PR, riscv-non-isa/riscv-toolchain-conventions#14 Issue, riscv-non-isa/riscv-toolchain-conventions#11 * Refer to the commit afc41ff, RISC-V: Reorder the prefixed extensions which are out of order. In the past we only allow to reorder the prefixed extensions. But according to the PR 14 in the riscv-toolchain-convention, we can also relax the order checking to allow the whole extensions be written out of orders, including the single standard extensions and the prefixed multi-letter extensions. Just that we still need to follow the following rules as usual, 1. prefixed extensions need to be seperated with `_'. 2. prefixed extensions need complete <major>.<minor> version if set. Please see the details in the march-ok-reorder gas testcase. Passed the riscv-gnu-toolchain regressions. bfd/ * elfxx-riscv.c (enum riscv_prefix_ext_class): Changed RV_ISA_CLASS_UNKNOWN to RV_ISA_CLASS_SINGLE, since everything that does not belong to the multi-keyword will possible be a single extension for the current parser. (parse_config): Likewise. (riscv_get_prefix_class): Likewise. (riscv_compare_subsets): Likewise. (riscv_parse_std_ext): Removed, and merged with riscv_parse_prefixed_ext into riscv_parse_extensions. (riscv_parse_prefixed_ext): Likewise. (riscv_parse_subset): Only need to call riscv_parse_extensions to parse both single standard and prefixed extensions. gas/ * testsuite/gas/riscv/march-fail-order-std.d: Removed since the relaxed order checking. * testsuite/gas/riscv/march-fail-order-std.l: Likewise. * testsuite/gas/riscv/march-fail-order-x-std.d: Likewise. * testsuite/gas/riscv/march-fail-order-z-std.d: Likewise. * testsuite/gas/riscv/march-fail-order-zx-std.l: Likewise. * testsuite/gas/riscv/march-fail-unknown-std.l: Updated. * testsuite/gas/riscv/march-ok-reorder.d: New testcase.
MaskRay
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Jan 10, 2024
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It looks like there is a GCC patch dropping the order requirement
https://gcc.gnu.org/pipermail/gcc-patches/2024-January/642151.html
If we had fewer extensions, ensuring a canonical order is better as a
code search of a fixed string will retrieve the relevant results, and
I'd wish that we did not lose the strictness.
Now that there are a hundred extensions, and there are very bizarre use cases, I agree that enforcing a strict order has lost its goodness...
This may be similar to AArch64 where one can arbitrary specify +a+b or +b+a.
asb
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Jan 16, 2024
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GCC patch has bee merged into trunk :) |
cmuellner
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Jan 29, 2024
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I think this is ready to land. |
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Ohhh, we made it before 2024 lunar new year 🎉 |
BeMg
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Follow riscv-non-isa/riscv-toolchain-conventions#14 by dropping the order requirement of `-march`. 1. single-letter extension can be arbitrary order - march=rv32iamdf 2. single-letter extension and multi-letter extension can be mixed - march=rv32i_zihintntl_m_a_f_d_svinval 3. multi-letter extension need seperate the following extension by underscore, otherwise it will be intreprete as one extension. - march=rv32i_zbam -> i,zbam - march=rv32i_zba_m -> i,zba,m
topperc
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With std::move added to fix build bot failure. Original commit message: Follow riscv-non-isa/riscv-toolchain-conventions#14 by dropping the order requirement of `-march`. 1. single-letter extension can be arbitrary order - march=rv32iamdf 2. single-letter extension and multi-letter extension can be mixed - march=rv32i_zihintntl_m_a_f_d_svinval 3. multi-letter extension need seperate the following extension by underscore, otherwise it will be intreprete as one extension. - march=rv32i_zbam -> i,zbam - march=rv32i_zba_m -> i,zba,m
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Changes:
2021/08/16: Remove order constraint between single-letter and multi-letter, also add 2 more NOTE.
It's corresponding for #11 ,