[v2] RISC-V: Documnet the list of supported extensions

  Try to list all supported extensions: name, version and few description
for each extension.

v2 changes:
 - Fix several typo.
 - Add expantion info for vector crypto extensions.
 - Drop zvl8192b, zvl16384b, zvl32768b and zvl65536b.
 - Aadd zicntr and zihpm

gcc/ChangeLog:

	* doc/invoke.texi (RISC-V Options): Add list of supported
	extensions.
---
 gcc/doc/invoke.texi | 461 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 461 insertions(+)
  

LGTM.



juzhe.zhong@rivai.ai
 
From: Kito Cheng
Date: 2024-01-19 17:40
To: gcc-patches; kito.cheng; jim.wilson.gcc; palmer; andrew; jeffreyalaw; christoph.muellner; juzhe.zhong; rep.dot.nop
CC: Kito Cheng
Subject: [PATCH v2] RISC-V: Documnet the list of supported extensions
Try to list all supported extensions: name, version and few description
for each extension.
 
v2 changes:
- Fix several typo.
- Add expantion info for vector crypto extensions.
- Drop zvl8192b, zvl16384b, zvl32768b and zvl65536b.
- Aadd zicntr and zihpm
 
gcc/ChangeLog:
 
* doc/invoke.texi (RISC-V Options): Add list of supported
extensions.
---
gcc/doc/invoke.texi | 461 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 461 insertions(+)
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index c0e513c8f27..313f363f5f2 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -30113,6 +30113,467 @@ syntax @samp{<major>p<minor>} or @samp{<major>}, (e.g.@: @samp{m2p1} or
@samp{m2}).
@end table
+Supported extension are listed below:
+@multitable @columnfractions .10 .10 .80
+@headitem Extension Name @tab Supported Version @tab Description
+@item i
+@tab 2.0, 2.1
+@tab Base integer extension.
+
+@item e
+@tab 2.0
+@tab Reduced base integer extension.
+
+@item g
+@tab -
+@tab General-purpose computing base extension, @samp{g} will expand to
+@samp{i}, @samp{m}, @samp{a}, @samp{f}, @samp{d}, @samp{zicsr} and
+@samp{zifencei}.
+
+@item m
+@tab 2.0
+@tab Integer multiplication and division extension.
+
+@item a
+@tab 2.0, 2.1
+@tab Atomic extension.
+
+@item f
+@tab 2.0, 2.2
+@tab Single-precision floating-point extension.
+
+@item d
+@tab 2.0, 2.2
+@tab Double-precision floating-point extension.
+
+@item c
+@tab 2.0
+@tab Compressed extension.
+
+@item h
+@tab 1.0
+@tab Hypervisor extension.
+
+@item v
+@tab 1.0
+@tab Vector extension.
+
+@item zicsr
+@tab 2.0
+@tab Control and status register access extension.
+
+@item zifencei
+@tab 2.0
+@tab Instruction-fetch fence extension.
+
+@item zicond
+@tab 1.0
+@tab Integer conditional operations extension.
+
+@item zawrs
+@tab 1.0
+@tab Wait-on-reservation-set extension.
+
+@item zba
+@tab 1.0
+@tab Address calculation extension.
+
+@item zbb
+@tab 1.0
+@tab Basic bit manipulation extension.
+
+@item zbc
+@tab 1.0
+@tab Carry-less multiplication extension.
+
+@item zbs
+@tab 1.0
+@tab Single-bit operation extension.
+
+@item zfinx
+@tab 1.0
+@tab Single-precision floating-point in integer registers extension.
+
+@item zdinx
+@tab 1.0
+@tab Double-precision floating-point in integer registers extension.
+
+@item zhinx
+@tab 1.0
+@tab Half-precision floating-point in integer registers extension.
+
+@item zhinxmin
+@tab 1.0
+@tab Minimal half-precision floating-point in integer registers extension.
+
+@item zbkb
+@tab 1.0
+@tab Cryptography bit-manipulation extension.
+
+@item zbkc
+@tab 1.0
+@tab Cryptography carry-less multiply extension.
+
+@item zbkx
+@tab 1.0
+@tab Cryptography crossbar permutation extension.
+
+@item zkne
+@tab 1.0
+@tab AES Encryption extension.
+
+@item zknd
+@tab 1.0
+@tab AES Decryption extension.
+
+@item zknh
+@tab 1.0
+@tab Hash function extension.
+
+@item zkr
+@tab 1.0
+@tab Entropy source extension.
+
+@item zksed
+@tab 1.0
+@tab SM4 block cipher extension.
+
+@item zksh
+@tab 1.0
+@tab SM3 hash function extension.
+
+@item zkt
+@tab 1.0
+@tab Data independent execution latency extension.
+
+@item zk
+@tab 1.0
+@tab Standard scalar cryptography extension.
+
+@item zkn
+@tab 1.0
+@tab NIST algorithm suite extension.
+
+@item zks
+@tab 1.0
+@tab ShangMi algorithm suite extension.
+
+@item zihintntl
+@tab 1.0
+@tab Non-temporal locality hints extension.
+
+@item zihintpause
+@tab 1.0
+@tab Pause hint extension.
+
+@item zicboz
+@tab 1.0
+@tab Cache-block zero extension.
+
+@item zicbom
+@tab 1.0
+@tab Cache-block management extension.
+
+@item zicbop
+@tab 1.0
+@tab Cache-block prefetch extension.
+
+@item zicntr
+@tab 2.0
+@tab Standard extension for base counters and timers.
+
+@item zihpm
+@tab 2.0
+@tab Standard extension for hardware performance counters.
+
+@item ztso
+@tab 1.0
+@tab Total store ordering extension.
+
+@item zve32x
+@tab 1.0
+@tab Vector extensions for embedded processors.
+
+@item zve32f
+@tab 1.0
+@tab Vector extensions for embedded processors.
+
+@item zve64x
+@tab 1.0
+@tab Vector extensions for embedded processors.
+
+@item zve64f
+@tab 1.0
+@tab Vector extensions for embedded processors.
+
+@item zve64d
+@tab 1.0
+@tab Vector extensions for embedded processors.
+
+@item zvl32b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl64b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl128b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl256b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl512b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl1024b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl2048b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvl4096b
+@tab 1.0
+@tab Minimum vector length standard extensions
+
+@item zvbb
+@tab 1.0
+@tab Vector basic bit-manipulation extension.
+
+@item zvbc
+@tab 1.0
+@tab Vector carryless multiplication extension.
+
+@item zvkb
+@tab 1.0
+@tab Vector cryptography bit-manipulation extension.
+
+@item zvkg
+@tab 1.0
+@tab Vector GCM/GMAC extension.
+
+@item zvkned
+@tab 1.0
+@tab Vector AES block cipher extension.
+
+@item zvknha
+@tab 1.0
+@tab Vector SHA-2 secure hash extension.
+
+@item zvknhb
+@tab 1.0
+@tab Vector SHA-2 secure hash extension.
+
+@item zvksed
+@tab 1.0
+@tab Vector SM4 Block Cipher extension.
+
+@item zvksh
+@tab 1.0
+@tab Vector SM3 Secure Hash extension.
+
+@item zvkn
+@tab 1.0
+@tab Vector NIST Algorithm Suite extension, @samp{zvkn} will expand to
+@samp{zvkned}, @samp{zvknhb}, @samp{zvkb} and @samp{zvkt}.
+
+@item zvknc
+@tab 1.0
+@tab Vector NIST Algorithm Suite with carryless multiply extension, @samp{zvknc}
+will expand to @samp{zvkn} and @samp{zvbc}.
+
+@item zvkng
+@tab 1.0
+@tab Vector NIST Algorithm Suite with GCM extension, @samp{zvkng} will expand
+to @samp{zvkn} and @samp{zvkg}.
+
+@item zvks
+@tab 1.0
+@tab Vector ShangMi algorithm suite extension, @samp{zvks} will expand
+to @samp{zvksed}, @samp{zvksh}, @samp{zvkb} and @samp{zvkt}.
+
+@item zvksc
+@tab 1.0
+@tab Vector ShangMi algorithm suite with carryless multiplication extension,
+@samp{zvksc} will expand to @samp{zvks} and @samp{zvbc}.
+
+@item zvksg
+@tab 1.0
+@tab Vector ShangMi algorithm suite with GCM extension, @samp{zvksg} will expand
+to @samp{zvks} and @samp{zvkg}.
+
+@item zvkt
+@tab 1.0
+@tab Vector data independent execution latency extension.
+
+@item zfh
+@tab 1.0
+@tab Half-precision floating-point extension.
+
+@item zfhmin
+@tab 1.0
+@tab Minimal half-precision floating-point extension.
+
+@item zvfh
+@tab 1.0
+@tab Vector half-precision floating-point extension.
+
+@item zvfhmin
+@tab 1.0
+@tab Vector minimal half-precision floating-point extension.
+
+@item zvfbfmin
+@tab 1.0
+@tab Vector BF16 converts extension.
+
+@item zfa
+@tab 1.0
+@tab Additional floating-point extension.
+
+@item zmmul
+@tab 1.0
+@tab Integer multiplication extension.
+
+@item zca
+@tab 1.0
+@tab Integer compressed instruction extension.
+
+@item zcf
+@tab 1.0
+@tab Compressed single-precision floating point loads and stores extension.
+
+@item zcd
+@tab 1.0
+@tab Compressed double-precision floating point loads and stores extension.
+
+@item zcb
+@tab 1.0
+@tab Simple compressed instruction extension.
+
+@item zce
+@tab 1.0
+@tab Compressed instruction extensions for embedded processors.
+
+@item zcmp
+@tab 1.0
+@tab Compressed push pop extension.
+
+@item zcmt
+@tab 1.0
+@tab Table jump instruction extension.
+
+@item smaia
+@tab 1.0
+@tab Advanced interrupt architecture extension.
+
+@item smepmp
+@tab 1.0
+@tab PMP Enhancements for memory access and execution prevention on Machine mode.
+
+@item smstateen
+@tab 1.0
+@tab State enable extension.
+
+@item ssaia
+@tab 1.0
+@tab Advanced interrupt architecture extension for supervisor-mode.
+
+@item sscofpmf
+@tab 1.0
+@tab Count overflow & filtering extension.
+
+@item ssstateen
+@tab 1.0
+@tab State-enable extension for supervisor-mode.
+
+@item sstc
+@tab 1.0
+@tab Supervisor-mode timer interrupts extension.
+
+@item svinval
+@tab 1.0
+@tab Fine-grained address-translation cache invalidation extension.
+
+@item svnapot
+@tab 1.0
+@tab NAPOT translation contiguity extension.
+
+@item svpbmt
+@tab 1.0
+@tab Page-based memory types extension.
+
+@item xcvmac
+@tab 1.0
+@tab Core-V multiply-accumulate extension.
+
+@item xcvalu
+@tab 1.0
+@tab Core-V miscellaneous ALU extension.
+
+@item xcvelw
+@tab 1.0
+@tab Core-V event load word extension.
+
+@item xtheadba
+@tab 1.0
+@tab T-head address calculation extension.
+
+@item xtheadbb
+@tab 1.0
+@tab T-head basic bit-manipulation extension.
+
+@item xtheadbs
+@tab 1.0
+@tab T-head single-bit instructions extension.
+
+@item xtheadcmo
+@tab 1.0
+@tab T-head cache management operations extension.
+
+@item xtheadcondmov
+@tab 1.0
+@tab T-head conditional move extension.
+
+@item xtheadfmemidx
+@tab 1.0
+@tab T-head indexed memory operations for floating-point registers extension.
+
+@item xtheadfmv
+@tab 1.0
+@tab T-head double floating-point high-bit data transmission extension.
+
+@item xtheadint
+@tab 1.0
+@tab T-head acceleration interruption extension.
+
+@item xtheadmac
+@tab 1.0
+@tab T-head multiply-accumulate extension.
+
+@item xtheadmemidx
+@tab 1.0
+@tab T-head indexed memory operation extension.
+
+@item xtheadmempair
+@tab 1.0
+@tab T-head two-GPR memory operation extension.
+
+@item xtheadsync
+@tab 1.0
+@tab T-head multi-core synchronization extension.
+
+@item xventanacondops
+@tab 1.0
+@tab Ventana integer conditional operations extension.
+
+@end multitable
+
When @option{-march=} is not specified, use the setting from @option{-mcpu}.
If both @option{-march} and @option{-mcpu=} are not specified, the default for
-- 
2.34.1
  

Pushed to trunk, thanks :)

On Fri, Jan 19, 2024 at 5:41 PM juzhe.zhong@rivai.ai
<juzhe.zhong@rivai.ai> wrote:
>
> LGTM.
>
> ________________________________
> juzhe.zhong@rivai.ai
>
>
> From: Kito Cheng
> Date: 2024-01-19 17:40
> To: gcc-patches; kito.cheng; jim.wilson.gcc; palmer; andrew; jeffreyalaw; christoph.muellner; juzhe.zhong; rep.dot.nop
> CC: Kito Cheng
> Subject: [PATCH v2] RISC-V: Documnet the list of supported extensions
> Try to list all supported extensions: name, version and few description
> for each extension.
>
> v2 changes:
> - Fix several typo.
> - Add expantion info for vector crypto extensions.
> - Drop zvl8192b, zvl16384b, zvl32768b and zvl65536b.
> - Aadd zicntr and zihpm
>
> gcc/ChangeLog:
>
> * doc/invoke.texi (RISC-V Options): Add list of supported
> extensions.
> ---
> gcc/doc/invoke.texi | 461 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 461 insertions(+)
>
> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> index c0e513c8f27..313f363f5f2 100644
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -30113,6 +30113,467 @@ syntax @samp{<major>p<minor>} or @samp{<major>}, (e.g.@: @samp{m2p1} or
> @samp{m2}).
> @end table
> +Supported extension are listed below:
> +@multitable @columnfractions .10 .10 .80
> +@headitem Extension Name @tab Supported Version @tab Description
> +@item i
> +@tab 2.0, 2.1
> +@tab Base integer extension.
> +
> +@item e
> +@tab 2.0
> +@tab Reduced base integer extension.
> +
> +@item g
> +@tab -
> +@tab General-purpose computing base extension, @samp{g} will expand to
> +@samp{i}, @samp{m}, @samp{a}, @samp{f}, @samp{d}, @samp{zicsr} and
> +@samp{zifencei}.
> +
> +@item m
> +@tab 2.0
> +@tab Integer multiplication and division extension.
> +
> +@item a
> +@tab 2.0, 2.1
> +@tab Atomic extension.
> +
> +@item f
> +@tab 2.0, 2.2
> +@tab Single-precision floating-point extension.
> +
> +@item d
> +@tab 2.0, 2.2
> +@tab Double-precision floating-point extension.
> +
> +@item c
> +@tab 2.0
> +@tab Compressed extension.
> +
> +@item h
> +@tab 1.0
> +@tab Hypervisor extension.
> +
> +@item v
> +@tab 1.0
> +@tab Vector extension.
> +
> +@item zicsr
> +@tab 2.0
> +@tab Control and status register access extension.
> +
> +@item zifencei
> +@tab 2.0
> +@tab Instruction-fetch fence extension.
> +
> +@item zicond
> +@tab 1.0
> +@tab Integer conditional operations extension.
> +
> +@item zawrs
> +@tab 1.0
> +@tab Wait-on-reservation-set extension.
> +
> +@item zba
> +@tab 1.0
> +@tab Address calculation extension.
> +
> +@item zbb
> +@tab 1.0
> +@tab Basic bit manipulation extension.
> +
> +@item zbc
> +@tab 1.0
> +@tab Carry-less multiplication extension.
> +
> +@item zbs
> +@tab 1.0
> +@tab Single-bit operation extension.
> +
> +@item zfinx
> +@tab 1.0
> +@tab Single-precision floating-point in integer registers extension.
> +
> +@item zdinx
> +@tab 1.0
> +@tab Double-precision floating-point in integer registers extension.
> +
> +@item zhinx
> +@tab 1.0
> +@tab Half-precision floating-point in integer registers extension.
> +
> +@item zhinxmin
> +@tab 1.0
> +@tab Minimal half-precision floating-point in integer registers extension.
> +
> +@item zbkb
> +@tab 1.0
> +@tab Cryptography bit-manipulation extension.
> +
> +@item zbkc
> +@tab 1.0
> +@tab Cryptography carry-less multiply extension.
> +
> +@item zbkx
> +@tab 1.0
> +@tab Cryptography crossbar permutation extension.
> +
> +@item zkne
> +@tab 1.0
> +@tab AES Encryption extension.
> +
> +@item zknd
> +@tab 1.0
> +@tab AES Decryption extension.
> +
> +@item zknh
> +@tab 1.0
> +@tab Hash function extension.
> +
> +@item zkr
> +@tab 1.0
> +@tab Entropy source extension.
> +
> +@item zksed
> +@tab 1.0
> +@tab SM4 block cipher extension.
> +
> +@item zksh
> +@tab 1.0
> +@tab SM3 hash function extension.
> +
> +@item zkt
> +@tab 1.0
> +@tab Data independent execution latency extension.
> +
> +@item zk
> +@tab 1.0
> +@tab Standard scalar cryptography extension.
> +
> +@item zkn
> +@tab 1.0
> +@tab NIST algorithm suite extension.
> +
> +@item zks
> +@tab 1.0
> +@tab ShangMi algorithm suite extension.
> +
> +@item zihintntl
> +@tab 1.0
> +@tab Non-temporal locality hints extension.
> +
> +@item zihintpause
> +@tab 1.0
> +@tab Pause hint extension.
> +
> +@item zicboz
> +@tab 1.0
> +@tab Cache-block zero extension.
> +
> +@item zicbom
> +@tab 1.0
> +@tab Cache-block management extension.
> +
> +@item zicbop
> +@tab 1.0
> +@tab Cache-block prefetch extension.
> +
> +@item zicntr
> +@tab 2.0
> +@tab Standard extension for base counters and timers.
> +
> +@item zihpm
> +@tab 2.0
> +@tab Standard extension for hardware performance counters.
> +
> +@item ztso
> +@tab 1.0
> +@tab Total store ordering extension.
> +
> +@item zve32x
> +@tab 1.0
> +@tab Vector extensions for embedded processors.
> +
> +@item zve32f
> +@tab 1.0
> +@tab Vector extensions for embedded processors.
> +
> +@item zve64x
> +@tab 1.0
> +@tab Vector extensions for embedded processors.
> +
> +@item zve64f
> +@tab 1.0
> +@tab Vector extensions for embedded processors.
> +
> +@item zve64d
> +@tab 1.0
> +@tab Vector extensions for embedded processors.
> +
> +@item zvl32b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl64b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl128b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl256b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl512b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl1024b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl2048b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvl4096b
> +@tab 1.0
> +@tab Minimum vector length standard extensions
> +
> +@item zvbb
> +@tab 1.0
> +@tab Vector basic bit-manipulation extension.
> +
> +@item zvbc
> +@tab 1.0
> +@tab Vector carryless multiplication extension.
> +
> +@item zvkb
> +@tab 1.0
> +@tab Vector cryptography bit-manipulation extension.
> +
> +@item zvkg
> +@tab 1.0
> +@tab Vector GCM/GMAC extension.
> +
> +@item zvkned
> +@tab 1.0
> +@tab Vector AES block cipher extension.
> +
> +@item zvknha
> +@tab 1.0
> +@tab Vector SHA-2 secure hash extension.
> +
> +@item zvknhb
> +@tab 1.0
> +@tab Vector SHA-2 secure hash extension.
> +
> +@item zvksed
> +@tab 1.0
> +@tab Vector SM4 Block Cipher extension.
> +
> +@item zvksh
> +@tab 1.0
> +@tab Vector SM3 Secure Hash extension.
> +
> +@item zvkn
> +@tab 1.0
> +@tab Vector NIST Algorithm Suite extension, @samp{zvkn} will expand to
> +@samp{zvkned}, @samp{zvknhb}, @samp{zvkb} and @samp{zvkt}.
> +
> +@item zvknc
> +@tab 1.0
> +@tab Vector NIST Algorithm Suite with carryless multiply extension, @samp{zvknc}
> +will expand to @samp{zvkn} and @samp{zvbc}.
> +
> +@item zvkng
> +@tab 1.0
> +@tab Vector NIST Algorithm Suite with GCM extension, @samp{zvkng} will expand
> +to @samp{zvkn} and @samp{zvkg}.
> +
> +@item zvks
> +@tab 1.0
> +@tab Vector ShangMi algorithm suite extension, @samp{zvks} will expand
> +to @samp{zvksed}, @samp{zvksh}, @samp{zvkb} and @samp{zvkt}.
> +
> +@item zvksc
> +@tab 1.0
> +@tab Vector ShangMi algorithm suite with carryless multiplication extension,
> +@samp{zvksc} will expand to @samp{zvks} and @samp{zvbc}.
> +
> +@item zvksg
> +@tab 1.0
> +@tab Vector ShangMi algorithm suite with GCM extension, @samp{zvksg} will expand
> +to @samp{zvks} and @samp{zvkg}.
> +
> +@item zvkt
> +@tab 1.0
> +@tab Vector data independent execution latency extension.
> +
> +@item zfh
> +@tab 1.0
> +@tab Half-precision floating-point extension.
> +
> +@item zfhmin
> +@tab 1.0
> +@tab Minimal half-precision floating-point extension.
> +
> +@item zvfh
> +@tab 1.0
> +@tab Vector half-precision floating-point extension.
> +
> +@item zvfhmin
> +@tab 1.0
> +@tab Vector minimal half-precision floating-point extension.
> +
> +@item zvfbfmin
> +@tab 1.0
> +@tab Vector BF16 converts extension.
> +
> +@item zfa
> +@tab 1.0
> +@tab Additional floating-point extension.
> +
> +@item zmmul
> +@tab 1.0
> +@tab Integer multiplication extension.
> +
> +@item zca
> +@tab 1.0
> +@tab Integer compressed instruction extension.
> +
> +@item zcf
> +@tab 1.0
> +@tab Compressed single-precision floating point loads and stores extension.
> +
> +@item zcd
> +@tab 1.0
> +@tab Compressed double-precision floating point loads and stores extension.
> +
> +@item zcb
> +@tab 1.0
> +@tab Simple compressed instruction extension.
> +
> +@item zce
> +@tab 1.0
> +@tab Compressed instruction extensions for embedded processors.
> +
> +@item zcmp
> +@tab 1.0
> +@tab Compressed push pop extension.
> +
> +@item zcmt
> +@tab 1.0
> +@tab Table jump instruction extension.
> +
> +@item smaia
> +@tab 1.0
> +@tab Advanced interrupt architecture extension.
> +
> +@item smepmp
> +@tab 1.0
> +@tab PMP Enhancements for memory access and execution prevention on Machine mode.
> +
> +@item smstateen
> +@tab 1.0
> +@tab State enable extension.
> +
> +@item ssaia
> +@tab 1.0
> +@tab Advanced interrupt architecture extension for supervisor-mode.
> +
> +@item sscofpmf
> +@tab 1.0
> +@tab Count overflow & filtering extension.
> +
> +@item ssstateen
> +@tab 1.0
> +@tab State-enable extension for supervisor-mode.
> +
> +@item sstc
> +@tab 1.0
> +@tab Supervisor-mode timer interrupts extension.
> +
> +@item svinval
> +@tab 1.0
> +@tab Fine-grained address-translation cache invalidation extension.
> +
> +@item svnapot
> +@tab 1.0
> +@tab NAPOT translation contiguity extension.
> +
> +@item svpbmt
> +@tab 1.0
> +@tab Page-based memory types extension.
> +
> +@item xcvmac
> +@tab 1.0
> +@tab Core-V multiply-accumulate extension.
> +
> +@item xcvalu
> +@tab 1.0
> +@tab Core-V miscellaneous ALU extension.
> +
> +@item xcvelw
> +@tab 1.0
> +@tab Core-V event load word extension.
> +
> +@item xtheadba
> +@tab 1.0
> +@tab T-head address calculation extension.
> +
> +@item xtheadbb
> +@tab 1.0
> +@tab T-head basic bit-manipulation extension.
> +
> +@item xtheadbs
> +@tab 1.0
> +@tab T-head single-bit instructions extension.
> +
> +@item xtheadcmo
> +@tab 1.0
> +@tab T-head cache management operations extension.
> +
> +@item xtheadcondmov
> +@tab 1.0
> +@tab T-head conditional move extension.
> +
> +@item xtheadfmemidx
> +@tab 1.0
> +@tab T-head indexed memory operations for floating-point registers extension.
> +
> +@item xtheadfmv
> +@tab 1.0
> +@tab T-head double floating-point high-bit data transmission extension.
> +
> +@item xtheadint
> +@tab 1.0
> +@tab T-head acceleration interruption extension.
> +
> +@item xtheadmac
> +@tab 1.0
> +@tab T-head multiply-accumulate extension.
> +
> +@item xtheadmemidx
> +@tab 1.0
> +@tab T-head indexed memory operation extension.
> +
> +@item xtheadmempair
> +@tab 1.0
> +@tab T-head two-GPR memory operation extension.
> +
> +@item xtheadsync
> +@tab 1.0
> +@tab T-head multi-core synchronization extension.
> +
> +@item xventanacondops
> +@tab 1.0
> +@tab Ventana integer conditional operations extension.
> +
> +@end multitable
> +
> When @option{-march=} is not specified, use the setting from @option{-mcpu}.
> If both @option{-march} and @option{-mcpu=} are not specified, the default for
> --
> 2.34.1
>
>