[PATCH] aarch64: Align lrcpc3 FEAT_STRING with /proc/cpuinfo 'Features' entry

[Victor Do Nascimento]

Due to the Linux kernel exposing the lrcpc3 architectural feature as
"lrcpc3", this patch corrects the relevant FEATURE_STRING entry in the
"rcpc3" AARCH64_OPT_FMV_EXTENSION macro, such that the feature can be
correctly detected when doing native compilation on rcpc3-enabled
targets.

Regtested on aarch64-linux-gnu.

gcc/ChangeLog:

        * config/aarch64/aarch64-option-extensions.def: Fix 'lrcpc3'
        entry.

gcc/testsuite/ChangeLog:

        * testsuite/gcc.target/aarch64/cpunative/info_24: New.
        * testsuite/gcc.target/aarch64/cpunative/native_cpu_24.c:
        Likewise.
---
 gcc/config/aarch64/aarch64-option-extensions.def      |  2 +-
 gcc/testsuite/gcc.target/aarch64/cpunative/info_24    |  8 ++++++++
 .../gcc.target/aarch64/cpunative/native_cpu_24.c      | 11 +++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gcc.target/aarch64/cpunative/info_24
 create mode 100644 gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_24.c

diff --git a/gcc/config/aarch64/aarch64-option-extensions.def 
b/gcc/config/aarch64/aarch64-option-extensions.def
index 1a3b91c68cf..975e7b84cec 100644
--- a/gcc/config/aarch64/aarch64-option-extensions.def
+++ b/gcc/config/aarch64/aarch64-option-extensions.def
@@ -174,7 +174,7 @@ AARCH64_OPT_FMV_EXTENSION("rcpc", RCPC, (), (), (), "lrcpc")
 
 AARCH64_FMV_FEATURE("rcpc2", RCPC2, (RCPC))
 
-AARCH64_OPT_FMV_EXTENSION("rcpc3", RCPC3, (), (), (), "rcpc3")
+AARCH64_OPT_FMV_EXTENSION("rcpc3", RCPC3, (), (), (), "lrcpc3")
 
 AARCH64_FMV_FEATURE("frintts", FRINTTS, ())
 
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/info_24 
b/gcc/testsuite/gcc.target/aarch64/cpunative/info_24
new file mode 100644
index 00000000000..8d3c16a1091
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/info_24
@@ -0,0 +1,8 @@
+processor      : 0
+BogoMIPS       : 100.00
+Features       : fp asimd evtstrm aes pmull sha1 sha2 crc32 asimddp lrcpc3
+CPU implementer        : 0xfe
+CPU architecture: 8
+CPU variant    : 0x0
+CPU part       : 0xd08
+CPU revision   : 2
\ No newline at end of file
diff --git a/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_24.c 
b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_24.c
new file mode 100644
index 00000000000..05dc870885f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/cpunative/native_cpu_24.c
@@ -0,0 +1,11 @@
+/* { dg-do compile { target { { aarch64*-*-linux*} && native } } } */
+/* { dg-set-compiler-env-var GCC_CPUINFO 
"$srcdir/gcc.target/aarch64/cpunative/info_23" } */
+/* { dg-additional-options "-mcpu=native --save-temps " } */
+
+int main()
+{
+  return 0;
+}
+
+/* { dg-final { scan-assembler {\.arch armv8-a\+dotprod\+crc\+crypto\+rcpc3} } 
} */
+/* Test one where rcpc3 is available and so should be emitted.  */
-- 
2.34.1