mirror of
https://github.com/golang/go
synced 2024-11-08 19:36:22 -07:00
16200c7333
- changes tests to check that the real and imaginary part of the go complex division result is equal to the result gcc produces for c99 - changes complex division code to satisfy new complex division test - adds float functions isNan, isFinite, isInf, abs and copysign in the runtime package Fixes #14644. name old time/op new time/op delta Complex128DivNormal-4 21.8ns ± 6% 13.9ns ± 6% -36.37% (p=0.000 n=20+20) Complex128DivNisNaN-4 14.1ns ± 1% 15.0ns ± 1% +5.86% (p=0.000 n=20+19) Complex128DivDisNaN-4 12.5ns ± 1% 16.7ns ± 1% +33.79% (p=0.000 n=19+20) Complex128DivNisInf-4 10.1ns ± 1% 13.0ns ± 1% +28.25% (p=0.000 n=20+19) Complex128DivDisInf-4 11.0ns ± 1% 20.9ns ± 1% +90.69% (p=0.000 n=16+19) ComplexAlgMap-4 86.7ns ± 1% 86.8ns ± 2% ~ (p=0.804 n=20+20) Change-Id: I261f3b4a81f6cc858bc7ff48f6fd1b39c300abf0 Reviewed-on: https://go-review.googlesource.com/37441 Reviewed-by: Robert Griesemer <gri@golang.org>
99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
// Copyright 2010 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// This C program generates the file cmplxdivide1.go. It uses the
|
|
// output of the operations by C99 as the reference to check
|
|
// the implementation of complex numbers in Go.
|
|
// The generated file, cmplxdivide1.go, is compiled along
|
|
// with the driver cmplxdivide.go (the names are confusing
|
|
// and unimaginative) to run the actual test. This is done by
|
|
// the usual test runner.
|
|
//
|
|
// The file cmplxdivide1.go is checked in to the repository, but
|
|
// if it needs to be regenerated, compile and run this C program
|
|
// like this:
|
|
// gcc '-std=c99' cmplxdivide.c && a.out >cmplxdivide1.go
|
|
|
|
#include <complex.h>
|
|
#include <math.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#define nelem(x) (sizeof(x)/sizeof((x)[0]))
|
|
|
|
double f[] = {
|
|
0.0,
|
|
-0.0,
|
|
1.0,
|
|
-1.0,
|
|
2.0,
|
|
NAN,
|
|
INFINITY,
|
|
-INFINITY,
|
|
};
|
|
|
|
char* fmt(double g) {
|
|
static char buf[10][30];
|
|
static int n;
|
|
char *p;
|
|
|
|
p = buf[n++];
|
|
if(n == 10) {
|
|
n = 0;
|
|
}
|
|
|
|
sprintf(p, "%g", g);
|
|
|
|
if(strcmp(p, "0") == 0) {
|
|
strcpy(p, "zero");
|
|
return p;
|
|
}
|
|
|
|
if(strcmp(p, "-0") == 0) {
|
|
strcpy(p, "-zero");
|
|
return p;
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
int main(void) {
|
|
int i, j, k, l;
|
|
double complex n, d, q;
|
|
|
|
printf("// skip\n");
|
|
printf("// # generated by cmplxdivide.c\n");
|
|
printf("\n");
|
|
printf("package main\n");
|
|
printf("\n");
|
|
printf("import \"math\"\n");
|
|
printf("\n");
|
|
printf("var (\n");
|
|
printf("\tnan = math.NaN()\n");
|
|
printf("\tinf = math.Inf(1)\n");
|
|
printf("\tzero = 0.0\n");
|
|
printf(")\n");
|
|
printf("\n");
|
|
printf("var tests = []struct {\n");
|
|
printf("\tf, g complex128\n");
|
|
printf("\tout complex128\n");
|
|
printf("}{\n");
|
|
|
|
for(i=0; i<nelem(f); i++)
|
|
for(j=0; j<nelem(f); j++)
|
|
for(k=0; k<nelem(f); k++)
|
|
for(l=0; l<nelem(f); l++) {
|
|
n = f[i] + f[j]*I;
|
|
d = f[k] + f[l]*I;
|
|
q = n/d;
|
|
|
|
printf("\t{complex(%s, %s), complex(%s, %s), complex(%s, %s)},\n",
|
|
fmt(creal(n)), fmt(cimag(n)),
|
|
fmt(creal(d)), fmt(cimag(d)),
|
|
fmt(creal(q)), fmt(cimag(q)));
|
|
}
|
|
printf("}\n");
|
|
return 0;
|
|
}
|