[libc-commits] [libc] [libc][stdfix] Implement fixed point `countlsfx` functions in llvm-libc (PR #125356)
via libc-commits
libc-commits at lists.llvm.org
Sat Feb 1 11:59:51 PST 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: Krishna Pandey (krishna2803)
<details>
<summary>Changes</summary>
fixes #<!-- -->113357
---
Patch is 47.47 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/125356.diff
49 Files Affected:
- (modified) libc/cmake/modules/CheckCompilerFeatures.cmake (+5)
- (added) libc/cmake/modules/compiler_features/check_padding_on_unsigned_fixed_point.cpp (+5)
- (modified) libc/config/baremetal/arm/entrypoints.txt (+12)
- (modified) libc/config/baremetal/riscv/entrypoints.txt (+12)
- (modified) libc/config/linux/riscv/entrypoints.txt (+12)
- (modified) libc/config/linux/x86_64/entrypoints.txt (+12)
- (modified) libc/docs/headers/math/stdfix.rst (+1-1)
- (modified) libc/include/stdfix.yaml (+84)
- (modified) libc/src/__support/fixed_point/CMakeLists.txt (+1)
- (modified) libc/src/__support/fixed_point/fx_bits.h (+34-1)
- (modified) libc/src/stdfix/CMakeLists.txt (+30)
- (added) libc/src/stdfix/countlshk.cpp (+20)
- (added) libc/src/stdfix/countlshk.h (+21)
- (added) libc/src/stdfix/countlshr.cpp (+20)
- (added) libc/src/stdfix/countlshr.h (+21)
- (added) libc/src/stdfix/countlsk.cpp (+20)
- (added) libc/src/stdfix/countlsk.h (+21)
- (added) libc/src/stdfix/countlslk.cpp (+20)
- (added) libc/src/stdfix/countlslk.h (+21)
- (added) libc/src/stdfix/countlslr.cpp (+20)
- (added) libc/src/stdfix/countlslr.h (+21)
- (added) libc/src/stdfix/countlsr.cpp (+20)
- (added) libc/src/stdfix/countlsr.h (+21)
- (added) libc/src/stdfix/countlsuhk.cpp (+20)
- (added) libc/src/stdfix/countlsuhk.h (+21)
- (added) libc/src/stdfix/countlsuhr.cpp (+20)
- (added) libc/src/stdfix/countlsuhr.h (+21)
- (added) libc/src/stdfix/countlsuk.cpp (+20)
- (added) libc/src/stdfix/countlsuk.h (+21)
- (added) libc/src/stdfix/countlsulk.cpp (+20)
- (added) libc/src/stdfix/countlsulk.h (+21)
- (added) libc/src/stdfix/countlsulr.cpp (+20)
- (added) libc/src/stdfix/countlsulr.h (+21)
- (added) libc/src/stdfix/countlsur.cpp (+20)
- (added) libc/src/stdfix/countlsur.h (+21)
- (modified) libc/test/src/stdfix/CMakeLists.txt (+35)
- (added) libc/test/src/stdfix/CountlsTest.h (+63)
- (added) libc/test/src/stdfix/countlshk_test.cpp (+13)
- (added) libc/test/src/stdfix/countlshr_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsk_test.cpp (+13)
- (added) libc/test/src/stdfix/countlslk_test.cpp (+13)
- (added) libc/test/src/stdfix/countlslr_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsr_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsuhk_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsuhr_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsuk_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsulk_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsulr_test.cpp (+13)
- (added) libc/test/src/stdfix/countlsur_test.cpp (+13)
``````````diff
diff --git a/libc/cmake/modules/CheckCompilerFeatures.cmake b/libc/cmake/modules/CheckCompilerFeatures.cmake
index a5ea66a5935b7b..ccb0e4bfc50976 100644
--- a/libc/cmake/modules/CheckCompilerFeatures.cmake
+++ b/libc/cmake/modules/CheckCompilerFeatures.cmake
@@ -15,6 +15,7 @@ set(
"fixed_point"
"cfloat16"
"cfloat128"
+ "padding_on_unsigned_fixed_point"
)
# Making sure ALL_COMPILER_FEATURES is sorted.
@@ -64,6 +65,8 @@ foreach(feature IN LISTS ALL_COMPILER_FEATURES)
set(link_options "")
if(${feature} STREQUAL "fixed_point")
list(APPEND compile_options "-ffixed-point")
+ elseif(${feature} STREQUAL "padding_on_unsigned_fixed_point")
+ list(APPEND compile_options "-ffixed-point -Xclang=-fpadding-on-unsigned-fixed-point")
elseif(${feature} MATCHES "^builtin_" OR
${feature} STREQUAL "float16_conversion")
set(compile_options ${LIBC_COMPILE_OPTIONS_DEFAULT})
@@ -112,6 +115,8 @@ foreach(feature IN LISTS ALL_COMPILER_FEATURES)
set(LIBC_TYPES_HAS_FLOAT128 TRUE)
elseif(${feature} STREQUAL "fixed_point")
set(LIBC_COMPILER_HAS_FIXED_POINT TRUE)
+ elseif(${feature} STREQUAL "padding_on_unsigned_fixed_point")
+ set(LIBC_COMPILER_HAS_PADDING_ON_UNSIGNED_FIXED_POINT TRUE)
elseif(${feature} STREQUAL "cfloat16")
set(LIBC_TYPES_HAS_CFLOAT16 TRUE)
elseif(${feature} STREQUAL "cfloat128")
diff --git a/libc/cmake/modules/compiler_features/check_padding_on_unsigned_fixed_point.cpp b/libc/cmake/modules/compiler_features/check_padding_on_unsigned_fixed_point.cpp
new file mode 100644
index 00000000000000..40b4da8c79621d
--- /dev/null
+++ b/libc/cmake/modules/compiler_features/check_padding_on_unsigned_fixed_point.cpp
@@ -0,0 +1,5 @@
+#include "include/llvm-libc-macros/stdfix-macros.h"
+
+#ifndef LIBC_COMPILER_HAS_PADDING_ON_UNSIGNED_FIXED_POINT
+#error unsupported
+#endif
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index 694cd7b1993ca2..351f727389e3ab 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -469,6 +469,18 @@ if(LIBC_COMPILER_HAS_FIXED_POINT)
libc.src.stdfix.ukbits
libc.src.stdfix.lkbits
libc.src.stdfix.ulkbits
+ libc.src.stdfix.countlshr
+ libc.src.stdfix.countlsr
+ libc.src.stdfix.countlslr
+ libc.src.stdfix.countlshk
+ libc.src.stdfix.countlsk
+ libc.src.stdfix.countlslk
+ libc.src.stdfix.countlsuhr
+ libc.src.stdfix.countlsur
+ libc.src.stdfix.countlsulr
+ libc.src.stdfix.countlsuhk
+ libc.src.stdfix.countlsuk
+ libc.src.stdfix.countlsulk
)
endif()
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index 667ab40dca9998..39c70a22a21e0e 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -464,6 +464,18 @@ if(LIBC_COMPILER_HAS_FIXED_POINT)
libc.src.stdfix.ukbits
libc.src.stdfix.lkbits
libc.src.stdfix.ulkbits
+ libc.src.stdfix.countlshr
+ libc.src.stdfix.countlsr
+ libc.src.stdfix.countlslr
+ libc.src.stdfix.countlshk
+ libc.src.stdfix.countlsk
+ libc.src.stdfix.countlslk
+ libc.src.stdfix.countlsuhr
+ libc.src.stdfix.countlsur
+ libc.src.stdfix.countlsulr
+ libc.src.stdfix.countlsuhk
+ libc.src.stdfix.countlsuk
+ libc.src.stdfix.countlsulk
)
endif()
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 14a05a2f3fbf2a..cb68fb077a869c 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -744,6 +744,18 @@ if(LIBC_COMPILER_HAS_FIXED_POINT)
# TODO: https://github.com/llvm/llvm-project/issues/115778
libc.src.stdfix.lkbits
libc.src.stdfix.ulkbits
+ libc.src.stdfix.countlshr
+ libc.src.stdfix.countlsr
+ libc.src.stdfix.countlslr
+ libc.src.stdfix.countlshk
+ libc.src.stdfix.countlsk
+ libc.src.stdfix.countlslk
+ libc.src.stdfix.countlsuhr
+ libc.src.stdfix.countlsur
+ libc.src.stdfix.countlsulr
+ libc.src.stdfix.countlsuhk
+ libc.src.stdfix.countlsuk
+ libc.src.stdfix.countlsulk
)
endif()
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 366e4d34294d15..ea276f3c963867 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -869,6 +869,18 @@ if(LIBC_COMPILER_HAS_FIXED_POINT)
libc.src.stdfix.ukbits
libc.src.stdfix.lkbits
libc.src.stdfix.ulkbits
+ libc.src.stdfix.countlshr
+ libc.src.stdfix.countlsr
+ libc.src.stdfix.countlslr
+ libc.src.stdfix.countlshk
+ libc.src.stdfix.countlsk
+ libc.src.stdfix.countlslk
+ libc.src.stdfix.countlsuhr
+ libc.src.stdfix.countlsur
+ libc.src.stdfix.countlsulr
+ libc.src.stdfix.countlsuhk
+ libc.src.stdfix.countlsuk
+ libc.src.stdfix.countlsulk
)
endif()
diff --git a/libc/docs/headers/math/stdfix.rst b/libc/docs/headers/math/stdfix.rst
index 58052f000995cd..4507f2b608bf1f 100644
--- a/libc/docs/headers/math/stdfix.rst
+++ b/libc/docs/headers/math/stdfix.rst
@@ -73,7 +73,7 @@ The following functions are included in the ISO/IEC TR 18037:2008 standard.
+---------------+----------------+-------------+---------------+------------+----------------+-------------+----------------+-------------+---------------+------------+----------------+-------------+
| \*bits | | | | | | | | | | | | |
+---------------+----------------+-------------+---------------+------------+----------------+-------------+----------------+-------------+---------------+------------+----------------+-------------+
-| countls | | | | | | | | | | | | |
+| countls | |check| | |check| | |check| | |check| | |check| | |check| | |check| | |check| | |check| | |check| | |check| | |check| |
+---------------+----------------+-------------+---------------+------------+----------------+-------------+----------------+-------------+---------------+------------+----------------+-------------+
| divi | | | | | | | | | | | | |
+---------------+----------------+-------------+---------------+------------+----------------+-------------+----------------+-------------+---------------+------------+----------------+-------------+
diff --git a/libc/include/stdfix.yaml b/libc/include/stdfix.yaml
index 9663ac0c7df4dc..0abf2f3a9b3b6d 100644
--- a/libc/include/stdfix.yaml
+++ b/libc/include/stdfix.yaml
@@ -306,3 +306,87 @@ functions:
arguments:
- type: unsigned int
guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlshr
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: short fract
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsr
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: fract
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlslr
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: long fract
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlshk
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: short accum
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsk
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: accum
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlslk
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: long accum
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsuhr
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: unsigned short fract
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsur
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: unsigned fract
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsulr
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: unsigned long fract
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsuhk
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: unsigned short accum
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsuk
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: unsigned accum
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
+ - name: countlsulk
+ standards:
+ - stdc_ext
+ return_type: int
+ arguments:
+ - type: unsigned long accum
+ guard: LIBC_COMPILER_HAS_FIXED_POINT
diff --git a/libc/src/__support/fixed_point/CMakeLists.txt b/libc/src/__support/fixed_point/CMakeLists.txt
index 3b744081765e4f..b415e2c00c488c 100644
--- a/libc/src/__support/fixed_point/CMakeLists.txt
+++ b/libc/src/__support/fixed_point/CMakeLists.txt
@@ -19,6 +19,7 @@ add_header_library(
libc.src.__support.macros.optimization
libc.src.__support.CPP.type_traits
libc.src.__support.CPP.bit
+ libc.src.__support.CPP.limits
libc.src.__support.math_extras
)
diff --git a/libc/src/__support/fixed_point/fx_bits.h b/libc/src/__support/fixed_point/fx_bits.h
index 225ea417760a03..a955ee67745c25 100644
--- a/libc/src/__support/fixed_point/fx_bits.h
+++ b/libc/src/__support/fixed_point/fx_bits.h
@@ -12,8 +12,9 @@
#include "include/llvm-libc-macros/stdfix-macros.h"
#include "src/__support/CPP/bit.h"
#include "src/__support/CPP/type_traits.h"
+#include "src/__support/CPP/limits.h" // numeric_limits
#include "src/__support/macros/attributes.h" // LIBC_INLINE
-#include "src/__support/macros/config.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
#include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
#include "src/__support/math_extras.h"
@@ -50,6 +51,12 @@ template <typename T> struct FXBits {
static constexpr StorageType SIGN_MASK =
(fx_rep::SIGN_LEN == 0 ? 0 : StorageType(1) << SIGN_OFFSET);
+ // mask for <integral | fraction>
+ static constexpr StorageType VALUE_MASK = INTEGRAL_MASK | FRACTION_MASK;
+
+ // mask for <sign | integral | fraction>
+ static constexpr StorageType TOTAL_MASK = SIGN_MASK | VALUE_MASK;
+
public:
LIBC_INLINE constexpr FXBits() = default;
@@ -74,6 +81,12 @@ template <typename T> struct FXBits {
return (value & INTEGRAL_MASK) >> INTEGRAL_OFFSET;
}
+ // returns complete bitstring representation the fixed point number
+ // the bitstring is of the form: padding | sign | integral | fraction
+ LIBC_INLINE constexpr StorageType get_bits() {
+ return (value & TOTAL_MASK) >> FRACTION_OFFSET;
+ }
+
// TODO: replace bool with Sign
LIBC_INLINE constexpr bool get_sign() {
return static_cast<bool>((value & SIGN_MASK) >> SIGN_OFFSET);
@@ -163,6 +176,26 @@ template <typename T> LIBC_INLINE constexpr T round(T x, int n) {
return bit_and((x + round_bit), rounding_mask);
}
+// count leading zeros
+template <typename T>
+LIBC_INLINE constexpr cpp::enable_if_t<cpp::is_fixed_point_v<T>, int>
+countls(T f) {
+ using FXRep = FXRep<T>;
+ using BitType = typename FXRep::StorageType;
+ using FXBits = FXBits<T>;
+
+ constexpr int CONTAIN_LEN = cpp::numeric_limits<BitType>::digits;
+ constexpr int PADDING_LEN = CONTAIN_LEN - (FXRep::INTEGRAL_LEN + FXRep::FRACTION_LEN);
+
+ if constexpr (FXRep::SIGN_LEN != 0) {
+ if (x < 0)
+ x = bit_not(x);
+ }
+
+ BitType value_bits = FXBits(x)::get_bits();
+ return cpp::countl_zero(value_bits) - PADDING_LEN;
+}
+
} // namespace fixed_point
} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/stdfix/CMakeLists.txt b/libc/src/stdfix/CMakeLists.txt
index 815f739d23efa4..ac5b31320a1050 100644
--- a/libc/src/stdfix/CMakeLists.txt
+++ b/libc/src/stdfix/CMakeLists.txt
@@ -104,3 +104,33 @@ add_entrypoint_object(
libc.src.__support.fixed_point.fx_rep
libc.src.__support.CPP.bit
)
+
+
+foreach(suffix IN ITEMS hr r lr hk k lk uhr ur ulr uhk uk ulk)
+ add_entrypoint_object(
+ countls${suffix}
+ HDRS
+ countls${suffix}.h
+ SRCS
+ countls${suffix}.cpp
+ COMPILE_OPTIONS
+ ${libc_opt_high_flag}
+ DEPENDS
+ libc.src.__support.fixed_point.fx_bits
+ )
+ if(LIBC_COMPILER_HAS_PADDING_ON_UNSIGNED_FIXED_POINT)
+ add_entrypoint_object(
+ countls${suffix}_padding_on_unsigned_fixed_point
+ HDRS
+ countls${suffix}.h
+ SRCS
+ countls${suffix}.cpp
+ COMPILE_OPTIONS
+ ${libc_opt_high_flag}
+ -Xclang=-fpadding-on-unsigned-fixed-point
+ DEPENDS
+ libc.src.__support.fixed_point.fx_bits
+ )
+ endif()
+
+endforeach()
diff --git a/libc/src/stdfix/countlshk.cpp b/libc/src/stdfix/countlshk.cpp
new file mode 100644
index 00000000000000..65230dd688a7ca
--- /dev/null
+++ b/libc/src/stdfix/countlshk.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation for countlshk function --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "countlshk.h"
+#include "src/__support/common.h"
+#include "src/__support/fixed_point/fx_bits.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, countlshk, (short accum f)) {
+ return fixed_point::countls(f);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/stdfix/countlshk.h b/libc/src/stdfix/countlshk.h
new file mode 100644
index 00000000000000..ecbc9075dcedf5
--- /dev/null
+++ b/libc/src/stdfix/countlshk.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for countlshk function -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STDFIX_COUNTLSHK_H
+#define LLVM_LIBC_SRC_STDFIX_COUNTLSHK_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+int countlshk(short accum f);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_STDFIX_COUNTLSHK_H
diff --git a/libc/src/stdfix/countlshr.cpp b/libc/src/stdfix/countlshr.cpp
new file mode 100644
index 00000000000000..d07bab8c4a1cd5
--- /dev/null
+++ b/libc/src/stdfix/countlshr.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation for countlshr function --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "countlshr.h"
+#include "src/__support/common.h"
+#include "src/__support/fixed_point/fx_bits.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, countlshr, (short fract f)) {
+ return fixed_point::countls(f);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/stdfix/countlshr.h b/libc/src/stdfix/countlshr.h
new file mode 100644
index 00000000000000..728b6873159184
--- /dev/null
+++ b/libc/src/stdfix/countlshr.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for countlshr function -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STDFIX_COUNTLSHR_H
+#define LLVM_LIBC_SRC_STDFIX_COUNTLSHR_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+int countlshr(short fract f);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_STDFIX_COUNTLSHR_H
diff --git a/libc/src/stdfix/countlsk.cpp b/libc/src/stdfix/countlsk.cpp
new file mode 100644
index 00000000000000..87c009aba0cb5b
--- /dev/null
+++ b/libc/src/stdfix/countlsk.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation for countlsk function --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "countlsk.h"
+#include "src/__support/common.h"
+#include "src/__support/fixed_point/fx_bits.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, countlsk, (accum f)) {
+ return fixed_point::countls(f);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/stdfix/countlsk.h b/libc/src/stdfix/countlsk.h
new file mode 100644
index 00000000000000..b7012da95a9c92
--- /dev/null
+++ b/libc/src/stdfix/countlsk.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for countlsk function -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STDFIX_COUNTLSK_H
+#define LLVM_LIBC_SRC_STDFIX_COUNTLSK_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+int countlsk(accum f);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_STDFIX_COUNTLSK_H
diff --git a/libc/src/stdfix/countlslk.cpp b/libc/src/stdfix/countlslk.cpp
new file mode 100644
index 00000000000000..16120b2f55a11d
--- /dev/null
+++ b/libc/src/stdfix/countlslk.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation for countlslk function --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "countlslk.h"
+#include "src/__support/common.h"
+#include "src/__support/fixed_point/fx_bits.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, countlslk, (long accum f)) {
+ return fixed_point::countls(f);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/stdfix/countlslk.h b/libc/src/stdfix/countlslk.h
new file mode 100644
index 00000000000000..90a2ccc33ce641
--- /dev/null
+++ b/libc/src/stdfix/countlslk.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for countlslk function -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_STDFIX_COUNTLSLK_H
+#define LLVM_LIBC_SRC_STDFIX_COUNTLSLK_H
+
+#include "include/llvm-libc-macros/stdfix-macros.h"
+#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL
+
+namespace LIBC_NAMESPACE_DECL {
+
+int countlslk(long accum f);
+
+} // namespace...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/125356
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