From c17484ad1830ddfdb3abbe96589b406096e389e1 Mon Sep 17 00:00:00 2001 From: Rutam <138517416+performant23@users.noreply.github.com> Date: Sat, 23 Mar 2024 13:34:40 +0530 Subject: [PATCH] feat: add C implementation for `math/base/special/fast/uint32-log2` PR-URL: https://github.com/stdlib-js/stdlib/pull/1946 Closes: https://github.com/stdlib-js/stdlib/issues/1931 Ref: https://github.com/stdlib-js/stdlib/issues/649 Co-authored-by: Athan Reines Reviewed-by: Athan Reines Reviewed-by: Pranav Goswami Signed-off-by: Rutam <138517416+performant23@users.noreply.github.com> Signed-off-by: Pranav Goswami Signed-off-by: Athan Reines Co-authored-by: Pranav Goswami --- .../base/special/fast/uint32-log2/README.md | 91 ++++++++++ .../uint32-log2/benchmark/benchmark.native.js | 58 ++++++ .../uint32-log2/benchmark/c/native/Makefile | 146 +++++++++++++++ .../benchmark/c/native/benchmark.c | 137 ++++++++++++++ .../base/special/fast/uint32-log2/binding.gyp | 170 ++++++++++++++++++ .../fast/uint32-log2/examples/c/Makefile | 146 +++++++++++++++ .../fast/uint32-log2/examples/c/example.c | 32 ++++ .../special/fast/uint32-log2/include.gypi | 53 ++++++ .../math/base/special/fast/uint32_log2.h | 43 +++++ .../special/fast/uint32-log2/lib/native.js | 54 ++++++ .../special/fast/uint32-log2/manifest.json | 68 +++++++ .../special/fast/uint32-log2/src/Makefile | 70 ++++++++ .../base/special/fast/uint32-log2/src/addon.c | 44 +++++ .../base/special/fast/uint32-log2/src/main.c | 94 ++++++++++ .../fast/uint32-log2/test/test.native.js | 74 ++++++++ 15 files changed, 1280 insertions(+) create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/benchmark.native.js create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/Makefile create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/benchmark.c create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/binding.gyp create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/Makefile create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/example.c create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/include.gypi create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/include/stdlib/math/base/special/fast/uint32_log2.h create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/lib/native.js create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/manifest.json create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/Makefile create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/addon.c create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/main.c create mode 100644 lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/test/test.native.js diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/README.md b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/README.md index 76eaa5e2cc8..20c5b974447 100644 --- a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/README.md +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/README.md @@ -88,6 +88,97 @@ for ( i = 1; i < 101; i++ ) { + + +* * * + +
+ +## C APIs + + + +
+ +
+ + + + + +
+ +### Usage + +```c +#include "stdlib/math/base/special/fast/uint32_log2.h" +``` + +#### stdlib_base_fast_uint32_log2( x ) + +Returns an **approximate** [binary logarithm][binary-logarithm] of an unsigned 32-bit integer `x`. + +```c +#include + +uint32_t out = stdlib_base_fast_uint32_log2( 4 ); +// returns 2 + +out = stdlib_base_fast_uint32_log2( 9 ); +// returns 3 +``` + +The function accepts the following arguments: + +- **x**: `[in] uint32_t` input value. + +```c +uint32_t stdlib_base_fast_uint32_log2( const uint32_t x ); +``` + +
+ + + + + +
+ +
+ + + + + +
+ +### Examples + +```c +#include "stdlib/math/base/special/fast/uint32_log2.h" +#include +#include + +int main( void ) { + const uint32_t x[] = { 5, 7, 10, 22, 98 }; + + uint32_t y; + int i; + for ( i = 0; i < 5; i++ ) { + y = stdlib_base_fast_uint32_log2( x[ i ] ); + printf( "uint32_log2(%u) = %u\n", x[ i ], y ); + } +} +``` + +
+ + + +
+ + +
diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/benchmark.native.js b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/benchmark.native.js new file mode 100644 index 00000000000..eeb82c9b56f --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/benchmark.native.js @@ -0,0 +1,58 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +'use strict'; + +// MODULES // + +var resolve = require( 'path' ).resolve; +var bench = require( '@stdlib/bench' ); +var minstd = require( '@stdlib/random/base/minstd-shuffle' ); +var isnan = require( '@stdlib/math/base/assert/is-nan' ); +var tryRequire = require( '@stdlib/utils/try-require' ); +var pkg = require( './../package.json' ).name; + + +// VARIABLES // + +var log2Uint32 = tryRequire( resolve( __dirname, './../lib/native.js' ) ); +var opts = { + 'skip': ( log2Uint32 instanceof Error ) +}; + + +// MAIN // + +bench( pkg+'::native', opts, function benchmark( b ) { + var y; + var i; + + b.tic(); + for ( i = 0; i < b.iterations; i++ ) { + y = log2Uint32( minstd() >>> 0 ); + if ( isnan( y ) ) { + b.fail( 'should not return NaN' ); + } + } + b.toc(); + if ( isnan( y ) ) { + b.fail( 'should not return NaN' ); + } + b.pass( 'benchmark finished' ); + b.end(); +}); diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/Makefile b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/Makefile new file mode 100644 index 00000000000..f69e9da2b4d --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/Makefile @@ -0,0 +1,146 @@ +#/ +# @license Apache-2.0 +# +# Copyright (c) 2024 The Stdlib Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +#/ + +# VARIABLES # + +ifndef VERBOSE + QUIET := @ +else + QUIET := +endif + +# Determine the OS ([1][1], [2][2]). +# +# [1]: https://en.wikipedia.org/wiki/Uname#Examples +# [2]: http://stackoverflow.com/a/27776822/2225624 +OS ?= $(shell uname) +ifneq (, $(findstring MINGW,$(OS))) + OS := WINNT +else +ifneq (, $(findstring MSYS,$(OS))) + OS := WINNT +else +ifneq (, $(findstring CYGWIN,$(OS))) + OS := WINNT +else +ifneq (, $(findstring Windows_NT,$(OS))) + OS := WINNT +endif +endif +endif +endif + +# Define the program used for compiling C source files: +ifdef C_COMPILER + CC := $(C_COMPILER) +else + CC := gcc +endif + +# Define the command-line options when compiling C files: +CFLAGS ?= \ + -std=c99 \ + -O3 \ + -Wall \ + -pedantic + +# Determine whether to generate position independent code ([1][1], [2][2]). +# +# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options +# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option +ifeq ($(OS), WINNT) + fPIC ?= +else + fPIC ?= -fPIC +endif + +# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`): +INCLUDE ?= + +# List of source files: +SOURCE_FILES ?= + +# List of libraries (e.g., `-lopenblas -lpthread`): +LIBRARIES ?= + +# List of library paths (e.g., `-L /foo/bar -L /beep/boop`): +LIBPATH ?= + +# List of C targets: +c_targets := benchmark.out + + +# RULES # + +#/ +# Compiles source files. +# +# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`) +# @param {string} [CFLAGS] - C compiler options +# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`) +# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`) +# @param {string} [SOURCE_FILES] - list of source files +# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`) +# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`) +# +# @example +# make +# +# @example +# make all +#/ +all: $(c_targets) + +.PHONY: all + +#/ +# Compiles C source files. +# +# @private +# @param {string} CC - C compiler (e.g., `gcc`) +# @param {string} CFLAGS - C compiler options +# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`) +# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`) +# @param {string} SOURCE_FILES - list of source files +# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`) +# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`) +#/ +$(c_targets): %.out: %.c + $(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES) + +#/ +# Runs compiled benchmarks. +# +# @example +# make run +#/ +run: $(c_targets) + $(QUIET) ./$< + +.PHONY: run + +#/ +# Removes generated files. +# +# @example +# make clean +#/ +clean: + $(QUIET) -rm -f *.o *.out + +.PHONY: clean diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/benchmark.c b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/benchmark.c new file mode 100644 index 00000000000..fd96b3ad721 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/benchmark/c/native/benchmark.c @@ -0,0 +1,137 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +/** +* Benchmark `uint32_log2`. +*/ +#include "stdlib/math/base/special/fast/uint32_log2.h" +#include +#include +#include +#include +#include +#include + +#define NAME "uint32_log2" +#define ITERATIONS 1000000 +#define REPEATS 3 + +/** +* Prints the TAP version. +*/ +void print_version() { + printf( "TAP version 13\n" ); +} + +/** +* Prints the TAP summary. +* +* @param total total number of tests +* @param passing total number of passing tests +*/ +void print_summary( int total, int passing ) { + printf( "#\n" ); + printf( "1..%d\n", total ); // TAP plan + printf( "# total %d\n", total ); + printf( "# pass %d\n", passing ); + printf( "#\n" ); + printf( "# ok\n" ); +} + +/** +* Prints benchmarks results. +* +* @param elapsed elapsed time in seconds +*/ +void print_results( double elapsed ) { + double rate = (double)ITERATIONS / elapsed; + printf( " ---\n" ); + printf( " iterations: %d\n", ITERATIONS ); + printf( " elapsed: %0.9f\n", elapsed ); + printf( " rate: %0.9f\n", rate ); + printf( " ...\n" ); +} + +/** +* Returns a clock time. +* +* @return clock time +*/ +double tic() { + struct timeval now; + gettimeofday( &now, NULL ); + return (double)now.tv_sec + (double)now.tv_usec/1.0e6; +} + +/** +* Generates a random number on the interval [0,1]. +* +* @return random number +*/ +double rand_double() { + int r = rand(); + return (double)r / ( (double)RAND_MAX + 1.0 ); +} + +/** +* Runs a benchmark. +* +* @return elapsed time in seconds +*/ +double benchmark() { + double elapsed; + uint32_t x; + uint32_t y; + double t; + int i; + + t = tic(); + for ( i = 0; i < ITERATIONS; i++ ) { + x = (uint32_t)rand(); + y = stdlib_base_fast_uint32_log2( x ); + if ( y > x ) { + printf( "unexpected result\n" ); + break; + } + } + elapsed = tic() - t; + if ( y > x ) { + printf( "unexpected result\n" ); + } + return elapsed; +} + +/** +* Main execution sequence. +*/ +int main( void ) { + double elapsed; + int i; + + // Use the current time to seed the random number generator: + srand( time( NULL ) ); + + print_version(); + for ( i = 0; i < REPEATS; i++ ) { + printf( "# c::native::%s\n", NAME ); + elapsed = benchmark(); + print_results( elapsed ); + printf( "ok %d benchmark finished\n", i+1 ); + } + print_summary( REPEATS, REPEATS ); +} diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/binding.gyp b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/binding.gyp new file mode 100644 index 00000000000..ec399223344 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/binding.gyp @@ -0,0 +1,170 @@ +# @license Apache-2.0 +# +# Copyright (c) 2024 The Stdlib Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +# A `.gyp` file for building a Node.js native add-on. +# +# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md +# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md +{ + # List of files to include in this file: + 'includes': [ + './include.gypi', + ], + + # Define variables to be used throughout the configuration for all targets: + 'variables': { + # Target name should match the add-on export name: + 'addon_target_name%': 'addon', + + # Set variables based on the host OS: + 'conditions': [ + [ + 'OS=="win"', + { + # Define the object file suffix: + 'obj': 'obj', + }, + { + # Define the object file suffix: + 'obj': 'o', + } + ], # end condition (OS=="win") + ], # end conditions + }, # end variables + + # Define compile targets: + 'targets': [ + + # Target to generate an add-on: + { + # The target name should match the add-on export name: + 'target_name': '<(addon_target_name)', + + # Define dependencies: + 'dependencies': [], + + # Define directories which contain relevant include headers: + 'include_dirs': [ + # Local include directory: + '<@(include_dirs)', + ], + + # List of source files: + 'sources': [ + '<@(src_files)', + ], + + # Settings which should be applied when a target's object files are used as linker input: + 'link_settings': { + # Define libraries: + 'libraries': [ + '<@(libraries)', + ], + + # Define library directories: + 'library_dirs': [ + '<@(library_dirs)', + ], + }, + + # C/C++ compiler flags: + 'cflags': [ + # Enable commonly used warning options: + '-Wall', + + # Aggressive optimization: + '-O3', + ], + + # C specific compiler flags: + 'cflags_c': [ + # Specify the C standard to which a program is expected to conform: + '-std=c99', + ], + + # C++ specific compiler flags: + 'cflags_cpp': [ + # Specify the C++ standard to which a program is expected to conform: + '-std=c++11', + ], + + # Linker flags: + 'ldflags': [], + + # Apply conditions based on the host OS: + 'conditions': [ + [ + 'OS=="mac"', + { + # Linker flags: + 'ldflags': [ + '-undefined dynamic_lookup', + '-Wl,-no-pie', + '-Wl,-search_paths_first', + ], + }, + ], # end condition (OS=="mac") + [ + 'OS!="win"', + { + # C/C++ flags: + 'cflags': [ + # Generate platform-independent code: + '-fPIC', + ], + }, + ], # end condition (OS!="win") + ], # end conditions + }, # end target <(addon_target_name) + + # Target to copy a generated add-on to a standard location: + { + 'target_name': 'copy_addon', + + # Declare that the output of this target is not linked: + 'type': 'none', + + # Define dependencies: + 'dependencies': [ + # Require that the add-on be generated before building this target: + '<(addon_target_name)', + ], + + # Define a list of actions: + 'actions': [ + { + 'action_name': 'copy_addon', + 'message': 'Copying addon...', + + # Explicitly list the inputs in the command-line invocation below: + 'inputs': [], + + # Declare the expected outputs: + 'outputs': [ + '<(addon_output_dir)/<(addon_target_name).node', + ], + + # Define the command-line invocation: + 'action': [ + 'cp', + '<(PRODUCT_DIR)/<(addon_target_name).node', + '<(addon_output_dir)/<(addon_target_name).node', + ], + }, + ], # end actions + }, # end target copy_addon + ], # end targets +} diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/Makefile b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/Makefile new file mode 100644 index 00000000000..6aed70daf16 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/Makefile @@ -0,0 +1,146 @@ +#/ +# @license Apache-2.0 +# +# Copyright (c) 2024 The Stdlib Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +#/ + +# VARIABLES # + +ifndef VERBOSE + QUIET := @ +else + QUIET := +endif + +# Determine the OS ([1][1], [2][2]). +# +# [1]: https://en.wikipedia.org/wiki/Uname#Examples +# [2]: http://stackoverflow.com/a/27776822/2225624 +OS ?= $(shell uname) +ifneq (, $(findstring MINGW,$(OS))) + OS := WINNT +else +ifneq (, $(findstring MSYS,$(OS))) + OS := WINNT +else +ifneq (, $(findstring CYGWIN,$(OS))) + OS := WINNT +else +ifneq (, $(findstring Windows_NT,$(OS))) + OS := WINNT +endif +endif +endif +endif + +# Define the program used for compiling C source files: +ifdef C_COMPILER + CC := $(C_COMPILER) +else + CC := gcc +endif + +# Define the command-line options when compiling C files: +CFLAGS ?= \ + -std=c99 \ + -O3 \ + -Wall \ + -pedantic + +# Determine whether to generate position independent code ([1][1], [2][2]). +# +# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options +# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option +ifeq ($(OS), WINNT) + fPIC ?= +else + fPIC ?= -fPIC +endif + +# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`): +INCLUDE ?= + +# List of source files: +SOURCE_FILES ?= + +# List of libraries (e.g., `-lopenblas -lpthread`): +LIBRARIES ?= + +# List of library paths (e.g., `-L /foo/bar -L /beep/boop`): +LIBPATH ?= + +# List of C targets: +c_targets := example.out + + +# RULES # + +#/ +# Compiles source files. +# +# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`) +# @param {string} [CFLAGS] - C compiler options +# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`) +# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`) +# @param {string} [SOURCE_FILES] - list of source files +# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`) +# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`) +# +# @example +# make +# +# @example +# make all +#/ +all: $(c_targets) + +.PHONY: all + +#/ +# Compiles C source files. +# +# @private +# @param {string} CC - C compiler (e.g., `gcc`) +# @param {string} CFLAGS - C compiler options +# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`) +# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`) +# @param {string} SOURCE_FILES - list of source files +# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`) +# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`) +#/ +$(c_targets): %.out: %.c + $(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES) + +#/ +# Runs compiled examples. +# +# @example +# make run +#/ +run: $(c_targets) + $(QUIET) ./$< + +.PHONY: run + +#/ +# Removes generated files. +# +# @example +# make clean +#/ +clean: + $(QUIET) -rm -f *.o *.out + +.PHONY: clean diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/example.c b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/example.c new file mode 100644 index 00000000000..8dbbf2598b4 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/examples/c/example.c @@ -0,0 +1,32 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +#include "stdlib/math/base/special/fast/uint32_log2.h" +#include +#include + +int main( void ) { + const uint32_t x[] = { 5, 7, 10, 22, 98 }; + + uint32_t y; + int i; + for ( i = 0; i < 5; i++ ) { + y = stdlib_base_fast_uint32_log2( x[ i ] ); + printf( "uint32_log2(%u) = %u\n", x[ i ], y ); + } +} diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/include.gypi b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/include.gypi new file mode 100644 index 00000000000..575cb043c0b --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/include.gypi @@ -0,0 +1,53 @@ +# @license Apache-2.0 +# +# Copyright (c) 2024 The Stdlib Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +# A GYP include file for building a Node.js native add-on. +# +# Main documentation: +# +# [1]: https://gyp.gsrc.io/docs/InputFormatReference.md +# [2]: https://gyp.gsrc.io/docs/UserDocumentation.md +{ + # Define variables to be used throughout the configuration for all targets: + 'variables': { + # Source directory: + 'src_dir': './src', + + # Include directories: + 'include_dirs': [ + ' + +/* +* If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler. +*/ +#ifdef __cplusplus +extern "C" { +#endif + +/** +* Computes an integer binary logarithm (base two). +*/ +uint32_t stdlib_base_fast_uint32_log2( const uint32_t x ); + +#ifdef __cplusplus +} +#endif + +#endif // !STDLIB_MATH_BASE_SPECIAL_FAST_UINT32_LOG2_H diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/lib/native.js b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/lib/native.js new file mode 100644 index 00000000000..8a39704f6ab --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/lib/native.js @@ -0,0 +1,54 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +'use strict'; + +// MODULES // + +var addon = require( './../src/addon.node' ); + + +// MAIN // + +/** +* Computes an integer binary logarithm (base two). +* +* @private +* @param {uinteger32} x - input value +* @returns {uinteger32} integer binary logarithm +* +* @example +* var out = log2Uint32( 4 ); +* // returns 2 +* +* @example +* var out = log2Uint32( 8 ); +* // returns 3 +* +* @example +* var out = log2Uint32( 9 ); +* // returns 3 +*/ +function log2Uint32( x ) { + return addon( x ); +} + + +// EXPORTS // + +module.exports = log2Uint32; diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/manifest.json b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/manifest.json new file mode 100644 index 00000000000..710288ade82 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/manifest.json @@ -0,0 +1,68 @@ +{ + "options": { + "task": "build" + }, + "fields": [ + { + "field": "src", + "resolve": true, + "relative": true + }, + { + "field": "include", + "resolve": true, + "relative": true + }, + { + "field": "libraries", + "resolve": false, + "relative": false + }, + { + "field": "libpath", + "resolve": true, + "relative": false + } + ], + "confs": [ + { + "task": "build", + "src": [ + "./src/main.c" + ], + "include": [ + "./include" + ], + "libraries": [], + "libpath": [], + "dependencies": [ + "@stdlib/napi/argv-uint32", + "@stdlib/napi/export" + ] + }, + { + "task": "benchmark", + "src": [ + "./src/main.c" + ], + "include": [ + "./include" + ], + "libraries": [], + "libpath": [], + "dependencies": [] + }, + { + "task": "examples", + "src": [ + "./src/main.c" + ], + "include": [ + "./include" + ], + "libraries": [], + "libpath": [], + "dependencies": [] + } + ] +} diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/Makefile b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/Makefile new file mode 100644 index 00000000000..bcf18aa4665 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/Makefile @@ -0,0 +1,70 @@ +#/ +# @license Apache-2.0 +# +# Copyright (c) 2024 The Stdlib Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +#/ + +# VARIABLES # + +ifndef VERBOSE + QUIET := @ +else + QUIET := +endif + +# Determine the OS ([1][1], [2][2]). +# +# [1]: https://en.wikipedia.org/wiki/Uname#Examples +# [2]: http://stackoverflow.com/a/27776822/2225624 +OS ?= $(shell uname) +ifneq (, $(findstring MINGW,$(OS))) + OS := WINNT +else +ifneq (, $(findstring MSYS,$(OS))) + OS := WINNT +else +ifneq (, $(findstring CYGWIN,$(OS))) + OS := WINNT +else +ifneq (, $(findstring Windows_NT,$(OS))) + OS := WINNT +endif +endif +endif +endif + + +# RULES # + +#/ +# Removes generated files for building an add-on. +# +# @example +# make clean-addon +#/ +clean-addon: + $(QUIET) -rm -f *.o *.node + +.PHONY: clean-addon + +#/ +# Removes generated files. +# +# @example +# make clean +#/ +clean: clean-addon + +.PHONY: clean diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/addon.c b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/addon.c new file mode 100644 index 00000000000..6f27f145558 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/addon.c @@ -0,0 +1,44 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +#include "stdlib/math/base/special/fast/uint32_log2.h" +#include "stdlib/napi/argv_uint32.h" +#include "stdlib/napi/export.h" +#include +#include + +/** +* Receives JavaScript callback invocation data. +* +* @private +* @param env environment under which the function is invoked +* @param info callback data +* @return Node-API value +*/ +static napi_value addon( napi_env env, napi_callback_info info ) { + STDLIB_NAPI_ARGV( env, info, argv, argc, 1 ); + STDLIB_NAPI_ARGV_UINT32( env, value, argv, 0 ); + + napi_value v; + napi_status status = napi_create_uint32( env, stdlib_base_fast_uint32_log2( value ), &v ); + assert( status == napi_ok ); + + return v; +} + +STDLIB_NAPI_MODULE_EXPORT_FCN( addon ) diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/main.c b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/main.c new file mode 100644 index 00000000000..d280a62e3f2 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/src/main.c @@ -0,0 +1,94 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +#include "stdlib/math/base/special/fast/uint32_log2.h" +#include + +static const uint32_t B4 = 0xFFFF0000u; +static const uint32_t B3 = 0xFF00u; +static const uint32_t B2 = 0xF0u; +static const uint32_t B1 = 0xCu; +static const uint32_t B0 = 0x2u; +static const uint32_t S4 = 16u; +static const uint32_t S3 = 8u; +static const uint32_t S2 = 4u; +static const uint32_t S1 = 2u; +static const uint32_t S0 = 1u; + +/** +* Computes an integer binary logarithm (base two). +* +* ## Method +* +* 1. Note that the largest unsigned 32-bit integer is `4294967295`, which is `2^{32}-1`. Hence, the integer binary logarithm cannot exceed `31` (i.e., `16 + 8 + 4 + 2 + 1`), which corresponds to the bit sequence +* +* ```binarystring +* 00000000000000000000000000011111 +* ``` +* +* 2. Initialize a return variable with the value zero. +* +* 3. If at least one of the first sixteen most significant bits of the input 32-bit integer `x` is turned on, we know that the power to which the number `2` must be raised to obtain `x` is at least `16` (i.e., `x > 65536`). Hence, activate the corresponding bit of the return variable. Mutate `x` by shifting sixteen bits to the right, discarding the bits shifted off. +* +* 4. Carry out the following steps with `B` in `[ 8, 4, 2, 1 ]`: +* +* - If at least one of the next `B` most significant bits of the current `x` is turned on, we know that the power to which the number `2` must be raised to obtain `x` has to be increased by `B`. +* - Activate the bit of the return variable that corresponds to `B`. +* - Mutate `x` by shifting `B` bits to the right, discarding the bits shifted off. +* +* 5. The final value of the return variable is the integer binary logarithm of `x`. +* +* @param x number +* @return integer binary logarithm +* +* @example +* uint32_t out = stdlib_base_fast_uint32_log2( 8 ); +* // returns 3 +*/ +uint32_t stdlib_base_fast_uint32_log2( const uint32_t x ) { + uint32_t out; + uint32_t xc; + + xc = x; + out = 0; + // `xc >= 65536`: + if ( xc & B4 ) { + xc >>= S4; + out |= S4; + } + // `xc >= 256`: + if ( xc & B3 ) { + xc >>= S3; + out |= S3; + } + // `xc >= 16`: + if ( xc & B2 ) { + xc >>= S2; + out |= S2; + } + // `xc >= 4`: + if ( xc & B1 ) { + xc >>= S1; + out |= S1; + } + // `xc >= 2`: + if ( xc & B0 ) { + out |= S0; + } + return out; +} diff --git a/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/test/test.native.js b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/test/test.native.js new file mode 100644 index 00000000000..06275f6daf3 --- /dev/null +++ b/lib/node_modules/@stdlib/math/base/special/fast/uint32-log2/test/test.native.js @@ -0,0 +1,74 @@ +/** +* @license Apache-2.0 +* +* Copyright (c) 2024 The Stdlib Authors. +* +* Licensed under the Apache License, Version 2.0 (the "License"); +* you may not use this file except in compliance with the License. +* You may obtain a copy of the License at +* +* http://www.apache.org/licenses/LICENSE-2.0 +* +* Unless required by applicable law or agreed to in writing, software +* distributed under the License is distributed on an "AS IS" BASIS, +* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +* See the License for the specific language governing permissions and +* limitations under the License. +*/ + +'use strict'; + +// MODULES // + +var resolve = require( 'path' ).resolve; +var tape = require( 'tape' ); +var minstd = require( '@stdlib/random/base/minstd-shuffle' ); +var log2 = require( '@stdlib/math/base/special/log2' ); +var floor = require( '@stdlib/math/base/special/floor' ); +var pow = require( '@stdlib/math/base/special/pow' ); +var tryRequire = require( '@stdlib/utils/try-require' ); + + +// VARIABLES // + +var log2Uint32 = tryRequire( resolve( __dirname, './../lib/native.js' ) ); +var opts = { + 'skip': ( log2Uint32 instanceof Error ) +}; + + +// TESTS // + +tape( 'main export is a function', opts, function test( t ) { + t.ok( true, __filename ); + t.strictEqual( typeof log2Uint32, 'function', 'main export is a function' ); + t.end(); +}); + +tape( 'the function returns an approximate binary logarithm (base two) for integer arguments', opts, function test( t ) { + var x; + var y; + var v; + var i; + + for ( i = 0; i < 5000; i++ ) { + x = minstd() >>> 0; + y = log2( x ); + v = log2Uint32( x ); + t.strictEqual( v, floor( y ), 'returns an approximate binary logarithm' ); + } + t.end(); +}); + +tape( 'the function returns the exact binary logarithm (base two) for integer powers of 2', opts, function test( t ) { + var x; + var y; + var i; + + for ( i = 0; i < 32; i++ ) { + x = pow( 2, i ); + y = log2Uint32( x ); + t.strictEqual( y, i, 'returns binary logarithm' ); + } + t.end(); +});