commit e4933c8a92ea08eecdf3ab45e7f76c95dc3d20ac
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Mar 2 14:58:05 2021 +0100
x86: Automate generation of PREFERRED_FEATURE_INDEX_1 bitfield
Use a .def file to define the bitfield layout, so that it is possible
to iterate over field members using the preprocessor.
Conflicts:
sysdeps/x86/include/cpu-features.h
(re-did the change from scratch)
sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
(adjusted to the downstream bits)
diff --git a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
new file mode 100644
index 0000000000000000..17a5cc428c1dabea
--- /dev/null
+++ b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
@@ -0,0 +1,34 @@
+/* Bits in the PREFERRED_FEATURE_INDEX_1 bitfield of <cpu-features.h>.
+ Copyright (C) 2020-2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+BIT (I586)
+BIT (I686)
+BIT (Fast_Rep_String)
+BIT (Fast_Copy_Backward)
+BIT (Fast_Unaligned_Load)
+BIT (Fast_Unaligned_Copy)
+BIT (Slow_BSF)
+BIT (Slow_SSE4_2)
+BIT (AVX_Fast_Unaligned_Load)
+BIT (Prefer_MAP_32BIT_EXEC)
+BIT (Prefer_PMINUB_for_stringop)
+BIT (Prefer_No_VZEROUPPER)
+BIT (Prefer_ERMS)
+BIT (Prefer_FSRM)
+BIT (Prefer_No_AVX512)
+BIT (MathVec_Prefer_No_AVX512)
diff --git a/sysdeps/x86/include/cpu-features.h b/sysdeps/x86/include/cpu-features.h
index f62be0b9b3746675..f43e22f677b249a9 100644
--- a/sysdeps/x86/include/cpu-features.h
+++ b/sysdeps/x86/include/cpu-features.h
@@ -80,40 +80,23 @@ enum
# define HAS_ARCH_FEATURE(name) \
CPU_FEATURE_PREFERRED (name)
-/* PREFERRED_FEATURE_INDEX_1. */
-# define bit_arch_I586 (1u << 0)
-# define bit_arch_I686 (1u << 1)
-# define bit_arch_Fast_Rep_String (1u << 2)
-# define bit_arch_Fast_Copy_Backward (1u << 3)
-# define bit_arch_Fast_Unaligned_Load (1u << 4)
-# define bit_arch_Fast_Unaligned_Copy (1u << 5)
-# define bit_arch_Slow_BSF (1u << 6)
-# define bit_arch_Slow_SSE4_2 (1u << 7)
-# define bit_arch_AVX_Fast_Unaligned_Load (1u << 8)
-# define bit_arch_Prefer_MAP_32BIT_EXEC (1u << 9)
-# define bit_arch_Prefer_PMINUB_for_stringop (1u << 10)
-# define bit_arch_Prefer_No_VZEROUPPER (1u << 11)
-# define bit_arch_Prefer_ERMS (1u << 12)
-# define bit_arch_Prefer_FSRM (1u << 13)
-# define bit_arch_Prefer_No_AVX512 (1u << 14)
-# define bit_arch_MathVec_Prefer_No_AVX512 (1u << 15)
-
-# define index_arch_Fast_Rep_String PREFERRED_FEATURE_INDEX_1
-# define index_arch_Fast_Copy_Backward PREFERRED_FEATURE_INDEX_1
-# define index_arch_Slow_BSF PREFERRED_FEATURE_INDEX_1
-# define index_arch_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1
-# define index_arch_Prefer_PMINUB_for_stringop PREFERRED_FEATURE_INDEX_1
-# define index_arch_Fast_Unaligned_Copy PREFERRED_FEATURE_INDEX_1
-# define index_arch_I586 PREFERRED_FEATURE_INDEX_1
-# define index_arch_I686 PREFERRED_FEATURE_INDEX_1
-# define index_arch_Slow_SSE4_2 PREFERRED_FEATURE_INDEX_1
-# define index_arch_AVX_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1
-# define index_arch_Prefer_MAP_32BIT_EXEC PREFERRED_FEATURE_INDEX_1
-# define index_arch_Prefer_No_VZEROUPPER PREFERRED_FEATURE_INDEX_1
-# define index_arch_Prefer_ERMS PREFERRED_FEATURE_INDEX_1
-# define index_arch_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1
-# define index_arch_MathVec_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1
-# define index_arch_Prefer_FSRM PREFERRED_FEATURE_INDEX_1
+/* PREFERRED_FEATURE_INDEX_1. First define the bitindex values
+ sequentially, then define the bit_arch* and index_arch_* lookup
+ constants. */
+enum
+ {
+#define BIT(x) _bitindex_arch_##x ,
+#include "cpu-features-preferred_feature_index_1.def"
+#undef BIT
+ };
+enum
+ {
+#define BIT(x) \
+ bit_arch_##x = 1u << _bitindex_arch_##x , \
+ index_arch_##x = PREFERRED_FEATURE_INDEX_1,
+#include "cpu-features-preferred_feature_index_1.def"
+#undef BIT
+ };
/* XCR0 Feature flags. */
# define bit_XMM_state (1u << 1)