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[PATCH][AArch64] Add Linux hwcap strings for some extensions

From: Kyrill Tkachov <kyrylo dot tkachov at foss dot arm dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: Richard Earnshaw <Richard dot Earnshaw at arm dot com>, James Greenhalgh <James dot Greenhalgh at arm dot com>, Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>
Date: Fri, 23 Aug 2019 17:42:30 +0100
Subject: [PATCH][AArch64] Add Linux hwcap strings for some extensions

Hi all,

This patch adds feature strings for some of the extensions. This stringis what is read from /proc/cpuinfo on Linux systems

and used during -march=native detection.

The strings are taken from the kernel source tree at:
https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/cpuinfo.c#L45

Bootstrapped and tested on aarch64-none-linux-gnu.

Ok for trunk?
Thanks,
Kyrill

2019-08-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

    * config/aarch64/aarch64-option-extensions.def (sb): Add feature
    string.
    (ssbs): Likewise.
    (sve2): Likewise.
    (sve2-sm4): Likewise.
    (sveaes): Likewise.
    (svesha3): Likewise.
    (svebitperm): Likewise.

diff --git a/gcc/config/aarch64/aarch64-option-extensions.def b/gcc/config/aarch64/aarch64-option-extensions.def
index 9919edd43d04db107f745b546d6586c43c51913f..de91550a53d8dae512f2d6c4bd57aae313c13973 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -155,10 +155,10 @@ AARCH64_OPT_EXTENSION("rng", AARCH64_FL_RNG, 0, 0, false, "")
 AARCH64_OPT_EXTENSION("memtag", AARCH64_FL_MEMTAG, 0, 0, false, "")
 
 /* Enabling/Disabling "sb" only changes "sb".  */
-AARCH64_OPT_EXTENSION("sb", AARCH64_FL_SB, 0, 0, false, "")
+AARCH64_OPT_EXTENSION("sb", AARCH64_FL_SB, 0, 0, false, "sb")
 
 /* Enabling/Disabling "ssbs" only changes "ssbs".  */
-AARCH64_OPT_EXTENSION("ssbs", AARCH64_FL_SSBS, 0, 0, false, "")
+AARCH64_OPT_EXTENSION("ssbs", AARCH64_FL_SSBS, 0, 0, false, "ssbs")
 
 /* Enabling/Disabling "predres" only changes "predres".  */
 AARCH64_OPT_EXTENSION("predres", AARCH64_FL_PREDRES, 0, 0, false, "")
@@ -169,31 +169,31 @@ AARCH64_OPT_EXTENSION("predres", AARCH64_FL_PREDRES, 0, 0, false, "")
 AARCH64_OPT_EXTENSION("sve2", AARCH64_FL_SVE2, AARCH64_FL_SVE | \
 		      AARCH64_FL_FP | AARCH64_FL_SIMD | AARCH64_FL_F16, \
 		      AARCH64_FL_SVE2_AES | AARCH64_FL_SVE2_SHA3 | \
-		      AARCH64_FL_SVE2_SM4 | AARCH64_FL_SVE2_BITPERM, false, "")
+		      AARCH64_FL_SVE2_SM4 | AARCH64_FL_SVE2_BITPERM, false, "sve2")
 
 /* Enabling "sve2-sm4" also enables "sm4", "simd", "fp16", "fp", "sve", and
    "sve2". Disabling "sve2-sm4" just disables "sve2-sm4".  */
 AARCH64_OPT_EXTENSION("sve2-sm4", AARCH64_FL_SVE2_SM4, AARCH64_FL_SM4 | \
 		      AARCH64_FL_SIMD | AARCH64_FL_F16 | AARCH64_FL_FP | \
-		      AARCH64_FL_SVE | AARCH64_FL_SVE2, 0, false, "")
+		      AARCH64_FL_SVE | AARCH64_FL_SVE2, 0, false, "svesm4")
 
 /* Enabling "sve2-aes" also enables "aes", "simd", "fp16", "fp", "sve", and
    "sve2". Disabling "sve2-aes" just disables "sve2-aes".  */
 AARCH64_OPT_EXTENSION("sve2-aes", AARCH64_FL_SVE2_AES, AARCH64_FL_AES | \
 		      AARCH64_FL_SIMD | AARCH64_FL_F16 | AARCH64_FL_FP | \
-		      AARCH64_FL_SVE | AARCH64_FL_SVE2, 0, false, "")
+		      AARCH64_FL_SVE | AARCH64_FL_SVE2, 0, false, "sveaes")
 
 /* Enabling "sve2-sha3" also enables "sha3", "simd", "fp16", "fp", "sve", and
    "sve2". Disabling "sve2-sha3" just disables "sve2-sha3".  */
 AARCH64_OPT_EXTENSION("sve2-sha3", AARCH64_FL_SVE2_SHA3, AARCH64_FL_SHA3 | \
 		      AARCH64_FL_SIMD | AARCH64_FL_F16 | AARCH64_FL_FP | \
-		      AARCH64_FL_SVE | AARCH64_FL_SVE2, 0, false, "")
+		      AARCH64_FL_SVE | AARCH64_FL_SVE2, 0, false, "svesha3")
 
 /* Enabling "sve2-bitperm" also enables "simd", "fp16", "fp", "sve", and
    "sve2".  Disabling "sve2-bitperm" just disables "sve2-bitperm".  */
 AARCH64_OPT_EXTENSION("sve2-bitperm", AARCH64_FL_SVE2_BITPERM, AARCH64_FL_SIMD | \
 		      AARCH64_FL_F16 | AARCH64_FL_FP | AARCH64_FL_SVE | \
-		      AARCH64_FL_SVE2, 0, false, "")
+		      AARCH64_FL_SVE2, 0, false, "svebitperm")
 
 /* Enabling or disabling "tme" only changes "tme".  */
 AARCH64_OPT_EXTENSION("tme", AARCH64_FL_TME, 0, 0, false, "")

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