Skip to content

Commit 9aaeaaa

Browse files
Neerajpathak07kgrytestdlib-bot
authored
feat: add C implementation for number/float32/base/signbit
PR-URL: #3399 Co-authored-by: Athan Reines <[email protected]> Reviewed-by: Athan Reines <[email protected]> Reviewed-by: Philipp Burckhardt <[email protected]> Co-authored-by: stdlib-bot <[email protected]>
1 parent 727d50a commit 9aaeaaa

File tree

18 files changed

+1292
-2
lines changed

18 files changed

+1292
-2
lines changed

‎lib/node_modules/@stdlib/number/float32/base/signbit/README.md

+84-2
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@ limitations under the License.
1818
1919
-->
2020

21-
# signbit
21+
# signbitf
2222

2323
> Return a boolean indicating if the sign bit for a [single-precision floating-point number][ieee754] is on (true) or off (false).
2424
@@ -32,7 +32,7 @@ var signbitf = require( '@stdlib/number/float32/base/signbit' );
3232

3333
#### signbitf( x )
3434

35-
Returns a `boolean` indicating if the sign bit for a [single-precision floating-point number][ieee754] is on (`true`) or off (`false`).
35+
Returns a boolean indicating if the sign bit for a [single-precision floating-point number][ieee754] is on (`true`) or off (`false`).
3636

3737
```javascript
3838
var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
@@ -82,6 +82,88 @@ for ( i = 0; i < 100; i++ ) {
8282

8383
<!-- /.examples -->
8484

85+
<!-- C interface documentation. -->
86+
87+
* * *
88+
89+
<section class="c">
90+
91+
## C APIs
92+
93+
<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
94+
95+
<section class="intro">
96+
97+
</section>
98+
99+
<!-- /.intro -->
100+
101+
<!-- C usage documentation. -->
102+
103+
<section class="usage">
104+
105+
### Usage
106+
107+
```c
108+
#include "stdlib/number/float32/base/signbit.h"
109+
```
110+
111+
#### stdlib_base_float32_signbit( x )
112+
113+
Returns an integer indicating whether the sign bit for a single-precision floating-point number is on (`1`) or off (`0`).
114+
115+
```c
116+
#include <stdint.h>
117+
118+
int8_t out = stdlib_base_float32_signbit( 3.14f );
119+
```
120+
121+
The function accepts the following arguments:
122+
123+
- **x**: `[in] float` input value.
124+
125+
```c
126+
int8_t stdlib_base_float32_signbit( const float x );
127+
```
128+
129+
</section>
130+
131+
<!-- /.usage -->
132+
133+
<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
134+
135+
<section class="notes">
136+
137+
</section>
138+
139+
<!-- /.notes -->
140+
141+
<!-- C API usage examples. -->
142+
143+
<section class="examples">
144+
145+
### Examples
146+
147+
```c
148+
#include "stdlib/number/float32/base/signbit.h"
149+
#include <stdint.h>
150+
#include <stdio.h>
151+
#include <inttypes.h>
152+
153+
int main( void ) {
154+
float x[] = { 3.14f, -3.14f, 0.0f, -0.0f, 4.0f, 1.0f, -1.0f, 1.0e38f, -1.0e38f };
155+
156+
int8_t out;
157+
int i;
158+
for ( i = 0; i < 9; i++ ) {
159+
stdlib_base_float32_signbit( x[ i ], &out );
160+
printf( "%f => signbit: %" PRId8 "\n", x[ i ], out );
161+
}
162+
}
163+
```
164+
165+
</section>
166+
85167
<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
86168

87169
<section class="related">

‎lib/node_modules/@stdlib/number/float32/base/signbit/benchmark/benchmark.native.js

+61
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,61 @@
1+
/**
2+
* @license Apache-2.0
3+
*
4+
* Copyright (c) 2025 The Stdlib Authors.
5+
*
6+
* Licensed under the Apache License, Version 2.0 (the "License");
7+
* you may not use this file except in compliance with the License.
8+
* You may obtain a copy of the License at
9+
*
10+
* http://www.apache.org/licenses/LICENSE-2.0
11+
*
12+
* Unless required by applicable law or agreed to in writing, software
13+
* distributed under the License is distributed on an "AS IS" BASIS,
14+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15+
* See the License for the specific language governing permissions and
16+
* limitations under the License.
17+
*/
18+
19+
'use strict';
20+
21+
// MODULES //
22+
23+
var resolve = require( 'path' ).resolve;
24+
var bench = require( '@stdlib/bench' );
25+
var randu = require( '@stdlib/random/base/randu' );
26+
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
27+
var toFloat32 = require( '@stdlib/number/float64/base/to-float32' );
28+
var tryRequire = require( '@stdlib/utils/try-require' );
29+
var pkg = require( './../package.json' ).name;
30+
31+
32+
// VARIABLES //
33+
34+
var signbitf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
35+
var opts = {
36+
'skip': ( signbitf instanceof Error )
37+
};
38+
39+
40+
// MAIN //
41+
42+
bench( pkg+'::native', opts, function benchmark( b ) {
43+
var x;
44+
var y;
45+
var i;
46+
47+
b.tic();
48+
for ( i = 0; i < b.iterations; i++ ) {
49+
x = ( randu()*1.0e7 ) - 5.0e6;
50+
y = signbitf( toFloat32( x ) );
51+
if ( typeof y !== 'boolean' ) {
52+
b.fail( 'should return a boolean' );
53+
}
54+
}
55+
b.toc();
56+
if ( !isBoolean( y ) ) {
57+
b.fail( 'should return a boolean' );
58+
}
59+
b.pass( 'benchmark finished' );
60+
b.end();
61+
});

‎lib/node_modules/@stdlib/number/float32/base/signbit/benchmark/c/Makefile

+146
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,146 @@
1+
#/
2+
# @license Apache-2.0
3+
#
4+
# Copyright (c) 2025 The Stdlib Authors.
5+
#
6+
# Licensed under the Apache License, Version 2.0 (the "License");
7+
# you may not use this file except in compliance with the License.
8+
# You may obtain a copy of the License at
9+
#
10+
# http://www.apache.org/licenses/LICENSE-2.0
11+
#
12+
# Unless required by applicable law or agreed to in writing, software
13+
# distributed under the License is distributed on an "AS IS" BASIS,
14+
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15+
# See the License for the specific language governing permissions and
16+
# limitations under the License.
17+
#/
18+
19+
# VARIABLES #
20+
21+
ifndef VERBOSE
22+
QUIET := @
23+
else
24+
QUIET :=
25+
endif
26+
27+
# Determine the OS ([1][1], [2][2]).
28+
#
29+
# [1]: https://en.wikipedia.org/wiki/Uname#Examples
30+
# [2]: http://stackoverflow.com/a/27776822/2225624
31+
OS ?= $(shell uname)
32+
ifneq (, $(findstring MINGW,$(OS)))
33+
OS := WINNT
34+
else
35+
ifneq (, $(findstring MSYS,$(OS)))
36+
OS := WINNT
37+
else
38+
ifneq (, $(findstring CYGWIN,$(OS)))
39+
OS := WINNT
40+
else
41+
ifneq (, $(findstring Windows_NT,$(OS)))
42+
OS := WINNT
43+
endif
44+
endif
45+
endif
46+
endif
47+
48+
# Define the program used for compiling C source files:
49+
ifdef C_COMPILER
50+
CC := $(C_COMPILER)
51+
else
52+
CC := gcc
53+
endif
54+
55+
# Define the command-line options when compiling C files:
56+
CFLAGS ?= \
57+
-std=c99 \
58+
-O3 \
59+
-Wall \
60+
-pedantic
61+
62+
# Determine whether to generate position independent code ([1][1], [2][2]).
63+
#
64+
# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
65+
# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
66+
ifeq ($(OS), WINNT)
67+
fPIC ?=
68+
else
69+
fPIC ?= -fPIC
70+
endif
71+
72+
# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
73+
INCLUDE ?=
74+
75+
# List of source files:
76+
SOURCE_FILES ?=
77+
78+
# List of libraries (e.g., `-lopenblas -lpthread`):
79+
LIBRARIES ?=
80+
81+
# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
82+
LIBPATH ?=
83+
84+
# List of C targets:
85+
c_targets := benchmark.out
86+
87+
88+
# RULES #
89+
90+
#/
91+
# Compiles source files.
92+
#
93+
# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
94+
# @param {string} [CFLAGS] - C compiler options
95+
# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
96+
# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
97+
# @param {string} [SOURCE_FILES] - list of source files
98+
# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
99+
# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
100+
#
101+
# @example
102+
# make
103+
#
104+
# @example
105+
# make all
106+
#/
107+
all: $(c_targets)
108+
109+
.PHONY: all
110+
111+
#/
112+
# Compiles C source files.
113+
#
114+
# @private
115+
# @param {string} CC - C compiler (e.g., `gcc`)
116+
# @param {string} CFLAGS - C compiler options
117+
# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
118+
# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
119+
# @param {string} SOURCE_FILES - list of source files
120+
# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
121+
# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
122+
#/
123+
$(c_targets): %.out: %.c
124+
$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
125+
126+
#/
127+
# Runs compiled benchmarks.
128+
#
129+
# @example
130+
# make run
131+
#/
132+
run: $(c_targets)
133+
$(QUIET) ./$<
134+
135+
.PHONY: run
136+
137+
#/
138+
# Removes generated files.
139+
#
140+
# @example
141+
# make clean
142+
#/
143+
clean:
144+
$(QUIET) -rm -f *.o *.out
145+
146+
.PHONY: clean

0 commit comments

Comments
 (0)