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commit a1eb3915e781c5b9aed89931cbd536a186c15ed5
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Tue Mar 2 14:58:05 2021 +0100
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x86: Automate generation of PREFERRED_FEATURE_INDEX_1 bitfield
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Use a .def file to define the bitfield layout, so that it is possible
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to iterate over field members using the preprocessor.
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(cherry picked from commit e4933c8a92ea08eecdf3ab45e7f76c95dc3d20ac)
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diff --git a/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
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new file mode 100644
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index 0000000000000000..06af1a8dd5c6c2b4
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--- /dev/null
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+++ b/sysdeps/x86/include/cpu-features-preferred_feature_index_1.def
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@@ -0,0 +1,34 @@
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+/* Bits in the PREFERRED_FEATURE_INDEX_1 bitfield of <cpu-features.h>.
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+ Copyright (C) 2020-2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+BIT (Fast_Rep_String)
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+BIT (Fast_Copy_Backward)
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+BIT (Slow_BSF)
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+BIT (Fast_Unaligned_Load)
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+BIT (Prefer_PMINUB_for_stringop)
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+BIT (Fast_Unaligned_Copy)
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+BIT (I586)
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+BIT (I686)
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+BIT (Slow_SSE4_2)
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+BIT (AVX_Fast_Unaligned_Load)
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+BIT (Prefer_MAP_32BIT_EXEC)
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+BIT (Prefer_No_VZEROUPPER)
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+BIT (Prefer_ERMS)
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+BIT (Prefer_No_AVX512)
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+BIT (MathVec_Prefer_No_AVX512)
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+BIT (Prefer_FSRM)
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diff --git a/sysdeps/x86/include/cpu-features.h b/sysdeps/x86/include/cpu-features.h
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index 624736b40ebb2cd6..e7f314657c8162da 100644
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--- a/sysdeps/x86/include/cpu-features.h
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+++ b/sysdeps/x86/include/cpu-features.h
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@@ -757,40 +757,23 @@ enum
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#define reg_AESKLE ebx
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#define reg_WIDE_KL ebx
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-/* PREFERRED_FEATURE_INDEX_1. */
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-#define bit_arch_I586 (1u << 0)
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-#define bit_arch_I686 (1u << 1)
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-#define bit_arch_Fast_Rep_String (1u << 2)
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-#define bit_arch_Fast_Copy_Backward (1u << 3)
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-#define bit_arch_Fast_Unaligned_Load (1u << 4)
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-#define bit_arch_Fast_Unaligned_Copy (1u << 5)
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-#define bit_arch_Slow_BSF (1u << 6)
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-#define bit_arch_Slow_SSE4_2 (1u << 7)
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-#define bit_arch_AVX_Fast_Unaligned_Load (1u << 8)
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-#define bit_arch_Prefer_MAP_32BIT_EXEC (1u << 9)
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-#define bit_arch_Prefer_PMINUB_for_stringop (1u << 10)
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-#define bit_arch_Prefer_No_VZEROUPPER (1u << 11)
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-#define bit_arch_Prefer_ERMS (1u << 12)
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-#define bit_arch_Prefer_FSRM (1u << 13)
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-#define bit_arch_Prefer_No_AVX512 (1u << 14)
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-#define bit_arch_MathVec_Prefer_No_AVX512 (1u << 15)
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-
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-#define index_arch_Fast_Rep_String PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Fast_Copy_Backward PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Slow_BSF PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Prefer_PMINUB_for_stringop PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Fast_Unaligned_Copy PREFERRED_FEATURE_INDEX_1
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-#define index_arch_I586 PREFERRED_FEATURE_INDEX_1
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-#define index_arch_I686 PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Slow_SSE4_2 PREFERRED_FEATURE_INDEX_1
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-#define index_arch_AVX_Fast_Unaligned_Load PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Prefer_MAP_32BIT_EXEC PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Prefer_No_VZEROUPPER PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Prefer_ERMS PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1
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-#define index_arch_MathVec_Prefer_No_AVX512 PREFERRED_FEATURE_INDEX_1
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-#define index_arch_Prefer_FSRM PREFERRED_FEATURE_INDEX_1
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+/* PREFERRED_FEATURE_INDEX_1. First define the bitindex values
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+ sequentially, then define the bit_arch* and index_arch_* lookup
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+ constants. */
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+enum
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+ {
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+#define BIT(x) _bitindex_arch_##x ,
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+#include "cpu-features-preferred_feature_index_1.def"
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+#undef BIT
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+ };
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+enum
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+ {
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+#define BIT(x) \
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+ bit_arch_##x = 1u << _bitindex_arch_##x , \
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+ index_arch_##x = PREFERRED_FEATURE_INDEX_1,
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+#include "cpu-features-preferred_feature_index_1.def"
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+#undef BIT
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+ };
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/* XCR0 Feature flags. */
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#define bit_XMM_state (1u << 1)
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