[gcc r14-9921] aarch64: Remove unsupported FMV features

[gcc r14-9921] aarch64: Remove unsupported FMV features

[Andrew Carlotti]

https://gcc.gnu.org/g:27e34311760456683d8316532dc57db24b3f410b

commit r14-9921-g27e34311760456683d8316532dc57db24b3f410b
Author: Andrew Carlotti <andrew.carlotti@arm.com>
Date:   Wed Apr 3 23:53:52 2024 +0100

    aarch64: Remove unsupported FMV features
    
    It currently isn't possible to support function multiversioning features
    properly in GCC without also enabling the extension in the command line
    options (with the exception of features such as "rpres" that do not
    require assembler support).  We therefore remove unsupported features
    from GCC's list of FMV features.
    
    Some of these features ("fcma", "jscvt", "frintts", "flagm2", "wfxt",
    "rcpc2", and perhaps "dpb" and "dpb2") will be added back in the future
    once support for the command line option has been added.
    
    The rest of the removed features I have proposed removing from the ACLE
    specification as well, since it doesn't seem worthwhile to include support
    for them; see the ACLE pull request for more detailed justification:
    https://github.com/ARM-software/acle/pull/315
    
    gcc/ChangeLog:
    
            * config/aarch64/aarch64-option-extensions.def:
            Remove "flagm2", "sha1", "pmull", "dit", "dpb", "dpb2", "jscvt",
            "fcma", "rcpc2", "frintts", "dgh", "ebf16", "sve-bf16",
            "sve-ebf16", "sve-i8mm", "sve2-pmull128", "memtag3", "bti" and
            "wfxt" entries.

Diff:
---
 gcc/config/aarch64/aarch64-option-extensions.def | 38 ------------------------
 1 file changed, 38 deletions(-)

diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index b7b307b24ea..54bbf9c41e7 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -103,8 +103,6 @@ AARCH64_OPT_FMV_EXTENSION("rng", RNG, (), (), (), "rng")
 
 AARCH64_OPT_FMV_EXTENSION("flagm", FLAGM, (), (), (), "flagm")
 
-AARCH64_FMV_FEATURE("flagm2", FLAGM2, (FLAGM))
-
 AARCH64_OPT_FMV_EXTENSION("lse", LSE, (), (), (), "atomics")
 
 AARCH64_OPT_FMV_EXTENSION("fp", FP, (), (), (), "fp")
@@ -124,16 +122,12 @@ AARCH64_FMV_FEATURE("rdm", RDM, (RDMA))
 
 AARCH64_OPT_FMV_EXTENSION("crc", CRC, (), (), (), "crc32")
 
-AARCH64_FMV_FEATURE("sha1", SHA1, ())
-
 AARCH64_OPT_FMV_EXTENSION("sha2", SHA2, (SIMD), (), (), "sha1 sha2")
 
 AARCH64_FMV_FEATURE("sha3", SHA3, (SHA3))
 
 AARCH64_OPT_FMV_EXTENSION("aes", AES, (SIMD), (), (), "aes")
 
-AARCH64_FMV_FEATURE("pmull", PMULL, ())
-
 /* +nocrypto disables AES, SHA2 and SM4, and anything that depends on them
    (such as SHA3 and the SVE2 crypto extensions).  */
 AARCH64_OPT_EXTENSION("crypto", CRYPTO, (AES, SHA2), (), (AES, SHA2, SM4),
@@ -157,44 +151,20 @@ AARCH64_OPT_EXTENSION("fp16fml", F16FML, (), (F16), (), "asimdfhm")
 
 AARCH64_FMV_FEATURE("fp16fml", FP16FML, (F16FML))
 
-AARCH64_FMV_FEATURE("dit", DIT, ())
-
-AARCH64_FMV_FEATURE("dpb", DPB, ())
-
-AARCH64_FMV_FEATURE("dpb2", DPB2, ())
-
-AARCH64_FMV_FEATURE("jscvt", JSCVT, ())
-
-AARCH64_FMV_FEATURE("fcma", FCMA, (SIMD))
-
 AARCH64_OPT_FMV_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
 
-AARCH64_FMV_FEATURE("rcpc2", RCPC2, (RCPC))
-
 AARCH64_OPT_FMV_EXTENSION("rcpc3", RCPC3, (), (), (), "lrcpc3")
 
-AARCH64_FMV_FEATURE("frintts", FRINTTS, ())
-
-AARCH64_FMV_FEATURE("dgh", DGH, ())
-
 AARCH64_OPT_FMV_EXTENSION("i8mm", I8MM, (SIMD), (), (), "i8mm")
 
 /* An explicit +bf16 implies +simd, but +bf16+nosimd still enables scalar BF16
    instructions.  */
 AARCH64_OPT_FMV_EXTENSION("bf16", BF16, (FP), (SIMD), (), "bf16")
 
-AARCH64_FMV_FEATURE("ebf16", EBF16, (BF16))
-
 AARCH64_FMV_FEATURE("rpres", RPRES, ())
 
 AARCH64_OPT_FMV_EXTENSION("sve", SVE, (SIMD, F16), (), (), "sve")
 
-AARCH64_FMV_FEATURE("sve-bf16", SVE_BF16, (SVE, BF16))
-
-AARCH64_FMV_FEATURE("sve-ebf16", SVE_EBF16, (SVE, BF16))
-
-AARCH64_FMV_FEATURE("sve-i8mm", SVE_I8MM, (SVE, I8MM))
-
 AARCH64_OPT_EXTENSION("f32mm", F32MM, (SVE), (), (), "f32mm")
 
 AARCH64_FMV_FEATURE("f32mm", SVE_F32MM, (F32MM))
@@ -209,8 +179,6 @@ AARCH64_OPT_EXTENSION("sve2-aes", SVE2_AES, (SVE2, AES), (), (), "sveaes")
 
 AARCH64_FMV_FEATURE("sve2-aes", SVE_AES, (SVE2_AES))
 
-AARCH64_FMV_FEATURE("sve2-pmull128", SVE_PMULL128, (SVE2))
-
 AARCH64_OPT_EXTENSION("sve2-bitperm", SVE2_BITPERM, (SVE2), (), (),
 		      "svebitperm")
 
@@ -230,8 +198,6 @@ AARCH64_OPT_FMV_EXTENSION("memtag", MEMTAG, (), (), (), "")
 
 AARCH64_FMV_FEATURE("memtag2", MEMTAG2, (MEMTAG))
 
-AARCH64_FMV_FEATURE("memtag3", MEMTAG3, (MEMTAG))
-
 AARCH64_OPT_FMV_EXTENSION("sb", SB, (), (), (), "sb")
 
 AARCH64_OPT_FMV_EXTENSION("predres", PREDRES, (), (), (), "")
@@ -240,8 +206,6 @@ AARCH64_OPT_FMV_EXTENSION("ssbs", SSBS, (), (), (), "ssbs")
 
 AARCH64_FMV_FEATURE("ssbs2", SSBS2, (SSBS))
 
-AARCH64_FMV_FEATURE("bti", BTI, ())
-
 AARCH64_OPT_EXTENSION("profile", PROFILE, (), (), (), "")
 
 AARCH64_OPT_EXTENSION("tme", TME, (), (), (), "")
@@ -256,8 +220,6 @@ AARCH64_FMV_FEATURE("ls64_v", LS64_V, ())
 
 AARCH64_FMV_FEATURE("ls64_accdata", LS64_ACCDATA, (LS64))
 
-AARCH64_FMV_FEATURE("wfxt", WFXT, ())
-
 AARCH64_OPT_EXTENSION("sme-f64f64", SME_F64F64, (SME), (), (), "")
 
 AARCH64_FMV_FEATURE("sme-f64f64", SME_F64, (SME_F64F64))