[libc-commits] [libc] [libc][stdbit] Update generated stdbit generic macros and add C tests. (PR #84670)
via libc-commits
libc-commits at lists.llvm.org
Sat Mar 9 23:11:26 PST 2024
https://github.com/lntue updated https://github.com/llvm/llvm-project/pull/84670
>From 185b3a7f9e38842c13f3221d40732e790248f529 Mon Sep 17 00:00:00 2001
From: Tue Ly <lntue at google.com>
Date: Sun, 10 Mar 2024 01:44:43 -0500
Subject: [PATCH 1/2] [libc][stdbit] Update generated stdbit generic macros and
add C tests.
---
libc/include/llvm-libc-macros/stdbit-macros.h | 112 ++++--------------
libc/test/include/CMakeLists.txt | 25 ++++
libc/test/include/stdbit_stub.h | 65 ++++++++++
libc/test/include/stdbit_test.c | 59 +++++++++
libc/test/include/stdbit_test.cpp | 78 +-----------
5 files changed, 175 insertions(+), 164 deletions(-)
create mode 100644 libc/test/include/stdbit_stub.h
create mode 100644 libc/test/include/stdbit_test.c
diff --git a/libc/include/llvm-libc-macros/stdbit-macros.h b/libc/include/llvm-libc-macros/stdbit-macros.h
index e3eb6630afddb6..d1b792e115992f 100644
--- a/libc/include/llvm-libc-macros/stdbit-macros.h
+++ b/libc/include/llvm-libc-macros/stdbit-macros.h
@@ -195,97 +195,35 @@ inline unsigned long long stdc_bit_floor(unsigned long long x) {
return stdc_bit_floor_ull(x);
}
#else
-#define stdc_leading_zeros(x) \
- _Generic((x), \
- unsigned char: stdc_leading_zeros_uc, \
- unsigned short: stdc_leading_zeros_us, \
- unsigned: stdc_leading_zeros_ui, \
- unsigned long: stdc_leading_zeros_ul, \
- unsigned long long: stdc_leading_zeros_ull)(x)
-#define stdc_leading_ones(x) \
- _Generic((x), \
- unsigned char: stdc_leading_ones_uc, \
- unsigned short: stdc_leading_ones_us, \
- unsigned: stdc_leading_ones_ui, \
- unsigned long: stdc_leading_ones_ul, \
- unsigned long long: stdc_leading_ones_ull)(x)
-#define stdc_trailing_zeros(x) \
- _Generic((x), \
- unsigned char: stdc_trailing_zeros_uc, \
- unsigned short: stdc_trailing_zeros_us, \
- unsigned: stdc_trailing_zeros_ui, \
- unsigned long: stdc_trailing_zeros_ul, \
- unsigned long long: stdc_trailing_zeros_ull)(x)
-#define stdc_trailing_ones(x) \
- _Generic((x), \
- unsigned char: stdc_trailing_ones_uc, \
- unsigned short: stdc_trailing_ones_us, \
- unsigned: stdc_trailing_ones_ui, \
- unsigned long: stdc_trailing_ones_ul, \
- unsigned long long: stdc_trailing_ones_ull)(x)
+
+#define STDBIT_GENERIC_FUNC(FUNC_NAME, x) \
+ _Generic((x), unsigned char \
+ : FUNC_NAME##_uc, unsigned short \
+ : FUNC_NAME##_us, unsigned \
+ : FUNC_NAME##_ui, unsigned long \
+ : FUNC_NAME##_ul, unsigned long long \
+ : FUNC_NAME##_ull)(x)
+
+#define stdc_leading_zeros(x) STDBIT_GENERIC_FUNC(stdc_leading_zeros, (x))
+#define stdc_leading_ones(x) STDBIT_GENERIC_FUNC(stdc_leading_ones, (x))
+#define stdc_trailing_zeros(x) STDBIT_GENERIC_FUNC(stdc_trailing_zeros, (x))
+#define stdc_trailing_ones(x) STDBIT_GENERIC_FUNC(stdc_trailing_ones, (x))
#define stdc_first_leading_zero(x) \
- _Generic((x), \
- unsigned char: stdc_first_leading_zero_uc, \
- unsigned short: stdc_first_leading_zero_us, \
- unsigned: stdc_first_leading_zero_ui, \
- unsigned long: stdc_first_leading_zero_ul, \
- unsigned long long: stdc_first_leading_zero_ull)(x)
+ STDBIT_GENERIC_FUNC(stdc_first_leading_zero, (x))
#define stdc_first_leading_one(x) \
- _Generic((x), \
- unsigned char: stdc_first_leading_one_uc, \
- unsigned short: stdc_first_leading_one_us, \
- unsigned: stdc_first_leading_one_ui, \
- unsigned long: stdc_first_leading_one_ul, \
- unsigned long long: stdc_first_leading_one_ull)(x)
+ STDBIT_GENERIC_FUNC(stdc_first_leading_one, (x))
#define stdc_first_trailing_zero(x) \
- _Generic((x), \
- unsigned char: stdc_first_trailing_zero_uc, \
- unsigned short: stdc_first_trailing_zero_us, \
- unsigned: stdc_first_trailing_zero_ui, \
- unsigned long: stdc_first_trailing_zero_ul, \
- unsigned long long: stdc_first_trailing_zero_ull)(x)
+ STDBIT_GENERIC_FUNC(stdc_first_trailing_zero, (x))
#define stdc_first_trailing_one(x) \
- _Generic((x), \
- unsigned char: stdc_first_trailing_one_uc, \
- unsigned short: stdc_first_trailing_one_us, \
- unsigned: stdc_first_trailing_one_ui, \
- unsigned long: stdc_first_trailing_one_ul, \
- unsigned long long: stdc_first_trailing_one_ull)(x)
-#define stdc_count_zeros(x) \
- _Generic((x), \
- unsigned char: stdc_count_zeros_uc, \
- unsigned short: stdc_count_zeros_us, \
- unsigned: stdc_count_zeros_ui, \
- unsigned long: stdc_count_zeros_ul, \
- unsigned long long: stdc_count_zeros_ull)(x)
-#define stdc_count_ones(x) \
- _Generic((x), \
- unsigned char: stdc_count_ones_uc, \
- unsigned short: stdc_count_ones_us, \
- unsigned: stdc_count_ones_ui, \
- unsigned long: stdc_count_ones_ul, \
- unsigned long long: stdc_count_ones_ull)(x)
-#define stdc_has_single_bit(x) \
- _Generic((x), \
- unsigned char: stdc_has_single_bit_uc, \
- unsigned short: stdc_has_single_bit_us, \
- unsigned: stdc_has_single_bit_ui, \
- unsigned long: stdc_has_single_bit_ul, \
- unsigned long long: stdc_has_single_bit_ull)(x)
-#define stdc_bit_width(x) \
- _Generic((x), \
- unsigned char: stdc_bit_width_uc, \
- unsigned short: stdc_bit_width_us, \
- unsigned: stdc_bit_width_ui, \
- unsigned long: stdc_bit_width_ul, \
- unsigned long long: stdc_bit_width_ull)(x)
-#define stdc_bit_floor(x) \
- _Generic((x), \
- unsigned char: stdc_bit_floor_uc, \
- unsigned short: stdc_bit_floor_us, \
- unsigned: stdc_bit_floor_ui, \
- unsigned long: stdc_bit_floor_ul, \
- unsigned long long: stdc_bit_floor_ull)(x)
+ STDBIT_GENERIC_FUNC(stdc_first_trailing_one, (x))
+#define stdc_count_zeros(x) STDBIT_GENERIC_FUNC(stdc_count_zeros, (x))
+#define stdc_count_ones(x) STDBIT_GENERIC_FUNC(stdc_count_ones, (x))
+#define stdc_has_single_bit(x) STDBIT_GENERIC_FUNC(stdc_has_single_bit, (x))
+#define stdc_bit_width(x) STDBIT_GENERIC_FUNC(stdc_bit_width, (x))
+#define stdc_bit_floor(x) STDBIT_GENERIC_FUNC(stdc_bit_floor, (x))
+
+#undef STDBIT_GENERIC_FUNC
+
#endif // __cplusplus
#endif // __LLVM_LIBC_MACROS_STDBIT_MACROS_H
diff --git a/libc/test/include/CMakeLists.txt b/libc/test/include/CMakeLists.txt
index bf845c94170f97..d76ad442d36ce4 100644
--- a/libc/test/include/CMakeLists.txt
+++ b/libc/test/include/CMakeLists.txt
@@ -22,16 +22,41 @@ if(LLVM_LIBC_FULL_BUILD AND libc.include.stdbit IN_LIST TARGET_PUBLIC_HEADERS)
stdbit_test
SUITE
libc_include_tests
+ HDRS
+ stdbit_stub.h
SRCS
stdbit_test.cpp
DEPENDS
libc.include.llvm-libc-macros.stdbit_macros
+ libc.include.llvm_libc_common_h
libc.include.stdbit
# Intentionally do not depend on libc.src.stdbit.*. The include test is
# simply testing the macros provided by stdbit.h, not the implementation
# of the underlying functions which the type generic macros may dispatch
# to.
)
+ add_libc_test(
+ stdbit_c_test
+ UNIT_TEST_ONLY
+ SUITE
+ libc_include_tests
+ HDRS
+ stdbit_stub.h
+ SRCS
+ stdbit_test.c
+ COMPILE_OPTIONS
+ -Wall
+ -Werror
+ DEPENDS
+ libc.include.llvm-libc-macros.stdbit_macros
+ libc.include.llvm_libc_common_h
+ libc.include.stdbit
+ libc.src.assert.__assert_fail
+ # Intentionally do not depend on libc.src.stdbit.*. The include test is
+ # simply testing the macros provided by stdbit.h, not the implementation
+ # of the underlying functions which the type generic macros may dispatch
+ # to.
+ )
endif()
add_libc_test(
diff --git a/libc/test/include/stdbit_stub.h b/libc/test/include/stdbit_stub.h
new file mode 100644
index 00000000000000..40436c95c5356f
--- /dev/null
+++ b/libc/test/include/stdbit_stub.h
@@ -0,0 +1,65 @@
+//===-- Utilities for testing stdbit --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDSList-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+/*
+ * Declare these BEFORE including stdbit-macros.h so that this test may still be
+ * run even if a given target doesn't yet have these individual entrypoints
+ * enabled.
+ */
+
+#include "include/__llvm-libc-common.h"
+
+#include <stdbool.h> // bool in C
+
+#define STDBIT_STUB_FUNCTION(FUNC_NAME, LEADING_VAL) \
+ unsigned FUNC_NAME##_uc(unsigned char x) __NOEXCEPT { \
+ return LEADING_VAL##AU; \
+ } \
+ unsigned FUNC_NAME##_us(unsigned short x) __NOEXCEPT { \
+ return LEADING_VAL##BU; \
+ } \
+ unsigned FUNC_NAME##_ui(unsigned int x) __NOEXCEPT { \
+ return LEADING_VAL##CU; \
+ } \
+ unsigned FUNC_NAME##_ul(unsigned long x) __NOEXCEPT { \
+ return LEADING_VAL##DU; \
+ } \
+ unsigned FUNC_NAME##_ull(unsigned long long x) __NOEXCEPT { \
+ return LEADING_VAL##EU; \
+ }
+
+__BEGIN_C_DECLS
+
+STDBIT_STUB_FUNCTION(stdc_leading_zeros, 0xA)
+STDBIT_STUB_FUNCTION(stdc_leading_ones, 0xB)
+STDBIT_STUB_FUNCTION(stdc_trailing_zeros, 0xC)
+STDBIT_STUB_FUNCTION(stdc_trailing_ones, 0xD)
+STDBIT_STUB_FUNCTION(stdc_first_leading_zero, 0xE)
+STDBIT_STUB_FUNCTION(stdc_first_leading_one, 0xF)
+STDBIT_STUB_FUNCTION(stdc_first_trailing_zero, 0x0)
+STDBIT_STUB_FUNCTION(stdc_first_trailing_one, 0x1)
+STDBIT_STUB_FUNCTION(stdc_count_zeros, 0x2)
+STDBIT_STUB_FUNCTION(stdc_count_ones, 0x3)
+
+bool stdc_has_single_bit_uc(unsigned char x) __NOEXCEPT { return false; }
+bool stdc_has_single_bit_us(unsigned short x) __NOEXCEPT { return false; }
+bool stdc_has_single_bit_ui(unsigned x) __NOEXCEPT { return false; }
+bool stdc_has_single_bit_ul(unsigned long x) __NOEXCEPT { return false; }
+bool stdc_has_single_bit_ull(unsigned long long x) __NOEXCEPT { return false; }
+
+STDBIT_STUB_FUNCTION(stdc_bit_width, 0x4)
+
+unsigned char stdc_bit_floor_uc(unsigned char x) __NOEXCEPT { return 0x5AU; }
+unsigned short stdc_bit_floor_us(unsigned short x) __NOEXCEPT { return 0x5BU; }
+unsigned stdc_bit_floor_ui(unsigned x) __NOEXCEPT { return 0x5CU; }
+unsigned long stdc_bit_floor_ul(unsigned long x) __NOEXCEPT { return 0x5DUL; }
+unsigned long long stdc_bit_floor_ull(unsigned long long x) __NOEXCEPT {
+ return 0x5EULL;
+}
+
+__END_C_DECLS
diff --git a/libc/test/include/stdbit_test.c b/libc/test/include/stdbit_test.c
new file mode 100644
index 00000000000000..7c1ddd23b6b44e
--- /dev/null
+++ b/libc/test/include/stdbit_test.c
@@ -0,0 +1,59 @@
+//===-- Unittests for stdbit ----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDSList-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+/*
+ * The intent of this test is validate that:
+ * 1. We provide the definition of the various type generic macros of stdbit.h
+ * (the macros are transitively included from stdbit-macros.h by stdbit.h).
+ * 2. It dispatches to the correct underlying function.
+ * Because unit tests build without public packaging, the object files produced
+ * do not contain non-namespaced symbols.
+ */
+
+/*
+ * Declare these BEFORE including stdbit-macros.h so that this test may still be
+ * run even if a given target doesn't yet have these individual entrypoints
+ * enabled.
+ */
+#include "stdbit_stub.h"
+
+#include "include/llvm-libc-macros/stdbit-macros.h"
+
+#include <assert.h>
+
+#define CHECK_FUNCTION(FUNC_NAME, VAL) \
+ do { \
+ assert(FUNC_NAME((unsigned char)0U) == VAL##AU); \
+ assert(FUNC_NAME((unsigned short)0U) == VAL##BU); \
+ assert(FUNC_NAME(0U) == VAL##CU); \
+ assert(FUNC_NAME(0UL) == VAL##DU); \
+ assert(FUNC_NAME(0ULL) == VAL##EU); \
+ } while (0)
+
+int main(void) {
+ CHECK_FUNCTION(stdc_leading_zeros, 0xA);
+ CHECK_FUNCTION(stdc_leading_ones, 0xB);
+ CHECK_FUNCTION(stdc_trailing_zeros, 0xC);
+ CHECK_FUNCTION(stdc_trailing_ones, 0xD);
+ CHECK_FUNCTION(stdc_first_leading_zero, 0xE);
+ CHECK_FUNCTION(stdc_first_leading_one, 0xF);
+ CHECK_FUNCTION(stdc_first_trailing_zero, 0x0);
+ CHECK_FUNCTION(stdc_first_trailing_one, 0x1);
+ CHECK_FUNCTION(stdc_count_zeros, 0x2);
+ CHECK_FUNCTION(stdc_count_ones, 0x3);
+
+ assert(!stdc_has_single_bit((unsigned char)1U));
+ assert(!stdc_has_single_bit((unsigned short)1U));
+ assert(!stdc_has_single_bit(1U));
+ assert(!stdc_has_single_bit(1UL));
+ assert(!stdc_has_single_bit(1ULL));
+
+ CHECK_FUNCTION(stdc_bit_width, 0x4);
+ CHECK_FUNCTION(stdc_bit_floor, 0x5);
+ return 0;
+}
diff --git a/libc/test/include/stdbit_test.cpp b/libc/test/include/stdbit_test.cpp
index 20820d52fbdede..6b4bef6f13e5ea 100644
--- a/libc/test/include/stdbit_test.cpp
+++ b/libc/test/include/stdbit_test.cpp
@@ -22,83 +22,7 @@
* run even if a given target doesn't yet have these individual entrypoints
* enabled.
*/
-extern "C" {
-unsigned stdc_leading_zeros_uc(unsigned char) noexcept { return 0xAAU; }
-unsigned stdc_leading_zeros_us(unsigned short) noexcept { return 0xABU; }
-unsigned stdc_leading_zeros_ui(unsigned) noexcept { return 0xACU; }
-unsigned stdc_leading_zeros_ul(unsigned long) noexcept { return 0xADU; }
-unsigned stdc_leading_zeros_ull(unsigned long long) noexcept { return 0xAEU; }
-unsigned stdc_leading_ones_uc(unsigned char) noexcept { return 0xBAU; }
-unsigned stdc_leading_ones_us(unsigned short) noexcept { return 0xBBU; }
-unsigned stdc_leading_ones_ui(unsigned) noexcept { return 0xBCU; }
-unsigned stdc_leading_ones_ul(unsigned long) noexcept { return 0xBDU; }
-unsigned stdc_leading_ones_ull(unsigned long long) noexcept { return 0xBEU; }
-unsigned stdc_trailing_zeros_uc(unsigned char) noexcept { return 0xCAU; }
-unsigned stdc_trailing_zeros_us(unsigned short) noexcept { return 0xCBU; }
-unsigned stdc_trailing_zeros_ui(unsigned) noexcept { return 0xCCU; }
-unsigned stdc_trailing_zeros_ul(unsigned long) noexcept { return 0xCDU; }
-unsigned stdc_trailing_zeros_ull(unsigned long long) noexcept { return 0xCEU; }
-unsigned stdc_trailing_ones_uc(unsigned char) noexcept { return 0xDAU; }
-unsigned stdc_trailing_ones_us(unsigned short) noexcept { return 0xDBU; }
-unsigned stdc_trailing_ones_ui(unsigned) noexcept { return 0xDCU; }
-unsigned stdc_trailing_ones_ul(unsigned long) noexcept { return 0xDDU; }
-unsigned stdc_trailing_ones_ull(unsigned long long) noexcept { return 0xDEU; }
-unsigned stdc_first_leading_zero_uc(unsigned char) noexcept { return 0xEAU; }
-unsigned stdc_first_leading_zero_us(unsigned short) noexcept { return 0xEBU; }
-unsigned stdc_first_leading_zero_ui(unsigned) noexcept { return 0xECU; }
-unsigned stdc_first_leading_zero_ul(unsigned long) noexcept { return 0xEDU; }
-unsigned stdc_first_leading_zero_ull(unsigned long long) noexcept {
- return 0xEEU;
-}
-unsigned stdc_first_leading_one_uc(unsigned char) noexcept { return 0xFAU; }
-unsigned stdc_first_leading_one_us(unsigned short) noexcept { return 0xFBU; }
-unsigned stdc_first_leading_one_ui(unsigned) noexcept { return 0xFCU; }
-unsigned stdc_first_leading_one_ul(unsigned long) noexcept { return 0xFDU; }
-unsigned stdc_first_leading_one_ull(unsigned long long) noexcept {
- return 0xFEU;
-}
-unsigned stdc_first_trailing_zero_uc(unsigned char) noexcept { return 0x0AU; }
-unsigned stdc_first_trailing_zero_us(unsigned short) noexcept { return 0x0BU; }
-unsigned stdc_first_trailing_zero_ui(unsigned) noexcept { return 0x0CU; }
-unsigned stdc_first_trailing_zero_ul(unsigned long) noexcept { return 0x0DU; }
-unsigned stdc_first_trailing_zero_ull(unsigned long long) noexcept {
- return 0x0EU;
-}
-unsigned stdc_first_trailing_one_uc(unsigned char) noexcept { return 0x1AU; }
-unsigned stdc_first_trailing_one_us(unsigned short) noexcept { return 0x1BU; }
-unsigned stdc_first_trailing_one_ui(unsigned) noexcept { return 0x1CU; }
-unsigned stdc_first_trailing_one_ul(unsigned long) noexcept { return 0x1DU; }
-unsigned stdc_first_trailing_one_ull(unsigned long long) noexcept {
- return 0x1EU;
-}
-unsigned stdc_count_zeros_uc(unsigned char) noexcept { return 0x2AU; }
-unsigned stdc_count_zeros_us(unsigned short) noexcept { return 0x2BU; }
-unsigned stdc_count_zeros_ui(unsigned) noexcept { return 0x2CU; }
-unsigned stdc_count_zeros_ul(unsigned long) noexcept { return 0x2DU; }
-unsigned stdc_count_zeros_ull(unsigned long long) noexcept { return 0x2EU; }
-unsigned stdc_count_ones_uc(unsigned char) noexcept { return 0x3AU; }
-unsigned stdc_count_ones_us(unsigned short) noexcept { return 0x3BU; }
-unsigned stdc_count_ones_ui(unsigned) noexcept { return 0x3CU; }
-unsigned stdc_count_ones_ul(unsigned long) noexcept { return 0x3DU; }
-unsigned stdc_count_ones_ull(unsigned long long) noexcept { return 0x3EU; }
-bool stdc_has_single_bit_uc(unsigned char) noexcept { return false; }
-bool stdc_has_single_bit_us(unsigned short) noexcept { return false; }
-bool stdc_has_single_bit_ui(unsigned) noexcept { return false; }
-bool stdc_has_single_bit_ul(unsigned long) noexcept { return false; }
-bool stdc_has_single_bit_ull(unsigned long long) noexcept { return false; }
-unsigned stdc_bit_width_uc(unsigned char) noexcept { return 0x4AU; }
-unsigned stdc_bit_width_us(unsigned short) noexcept { return 0x4BU; }
-unsigned stdc_bit_width_ui(unsigned) noexcept { return 0x4CU; }
-unsigned stdc_bit_width_ul(unsigned long) noexcept { return 0x4DU; }
-unsigned stdc_bit_width_ull(unsigned long long) noexcept { return 0x4EU; }
-unsigned char stdc_bit_floor_uc(unsigned char) noexcept { return 0x5AU; }
-unsigned short stdc_bit_floor_us(unsigned short) noexcept { return 0x5BU; }
-unsigned stdc_bit_floor_ui(unsigned) noexcept { return 0x5CU; }
-unsigned long stdc_bit_floor_ul(unsigned long) noexcept { return 0x5DU; }
-unsigned long long stdc_bit_floor_ull(unsigned long long) noexcept {
- return 0x5EU;
-}
-}
+#include "stdbit_stub.h"
#include "include/llvm-libc-macros/stdbit-macros.h"
>From bb9b082e4780e9619ad082d48f5783805d5b6804 Mon Sep 17 00:00:00 2001
From: Tue Ly <lntue at google.com>
Date: Sun, 10 Mar 2024 03:11:06 -0400
Subject: [PATCH 2/2] Fix formatting.
---
libc/include/llvm-libc-macros/stdbit-macros.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/libc/include/llvm-libc-macros/stdbit-macros.h b/libc/include/llvm-libc-macros/stdbit-macros.h
index d1b792e115992f..992fbde7abbebb 100644
--- a/libc/include/llvm-libc-macros/stdbit-macros.h
+++ b/libc/include/llvm-libc-macros/stdbit-macros.h
@@ -197,12 +197,12 @@ inline unsigned long long stdc_bit_floor(unsigned long long x) {
#else
#define STDBIT_GENERIC_FUNC(FUNC_NAME, x) \
- _Generic((x), unsigned char \
- : FUNC_NAME##_uc, unsigned short \
- : FUNC_NAME##_us, unsigned \
- : FUNC_NAME##_ui, unsigned long \
- : FUNC_NAME##_ul, unsigned long long \
- : FUNC_NAME##_ull)(x)
+ _Generic((x), \
+ unsigned char: FUNC_NAME##_uc, \
+ unsigned short: FUNC_NAME##_us, \
+ unsigned: FUNC_NAME##_ui, \
+ unsigned long: FUNC_NAME##_ul, \
+ unsigned long long: FUNC_NAME##_ull)(x)
#define stdc_leading_zeros(x) STDBIT_GENERIC_FUNC(stdc_leading_zeros, (x))
#define stdc_leading_ones(x) STDBIT_GENERIC_FUNC(stdc_leading_ones, (x))
More information about the libc-commits
mailing list