x86: Install <bits/platform/x86.h> [BZ #27958]

1. Install <bits/platform/x86.h> for <sys/platform/x86.h> which includes
<bits/platform/x86.h>.
2. Rename HAS_CPU_FEATURE to CPU_FEATURE_PRESENT which checks if the
processor has the feature.
3. Rename CPU_FEATURE_USABLE to CPU_FEATURE_ACTIVE which checks if the
feature is active.  There may be other preconditions, like sufficient
stack space or further setup for AMX, which must be satisfied before the
feature can be used.

This fixes BZ #27958.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/sysdeps/x86/tst-ifunc-isa.h b/sysdeps/x86/tst-ifunc-isa.h
index 6d906966a7..85616e29ad 100644
--- a/sysdeps/x86/tst-ifunc-isa.h
+++ b/sysdeps/x86/tst-ifunc-isa.h
@@ -1,4 +1,4 @@
-/* IFUNC resolver with CPU_FEATURE_USABLE.
+/* IFUNC resolver with CPU_FEATURE_ACTIVE.
    Copyright (C) 2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -32,15 +32,15 @@ enum isa
 __attribute__ ((__optimize__ ("-fno-stack-protector")))
 get_isa (void)
 {
-  if (CPU_FEATURE_USABLE (AVX512F))
+  if (CPU_FEATURE_ACTIVE (AVX512F))
     return avx512f;
-  if (CPU_FEATURE_USABLE (AVX2))
+  if (CPU_FEATURE_ACTIVE (AVX2))
     return avx2;
-  if (CPU_FEATURE_USABLE (AVX))
+  if (CPU_FEATURE_ACTIVE (AVX))
     return avx;
-  if (CPU_FEATURE_USABLE (SSE4_2))
+  if (CPU_FEATURE_ACTIVE (SSE4_2))
     return sse4_2;
-  if (CPU_FEATURE_USABLE (SSE2))
+  if (CPU_FEATURE_ACTIVE (SSE2))
     return sse2;
   return none;
 }