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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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This C program generates the file cmplxdivide1.go. It uses the
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// output of the operations by C99 as the reference to check
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// the implementation of complex numbers in Go.
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// The generated file, cmplxdivide1.go, is compiled along
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// with the driver cmplxdivide.go (the names are confusing
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// and unimaginative) to run the actual test. This is done by
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// the usual test runner.
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//
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// The file cmplxdivide1.go is checked in to the repository, but
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// if it needs to be regenerated, compile and run this C program
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// like this:
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// gcc '-std=c99' cmplxdivide.c && a.out >cmplxdivide1.go
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#include <complex.h>
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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#define nelem(x) (sizeof(x)/sizeof((x)[0]))
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double f[] = {
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0.0,
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-0.0,
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1.0,
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-1.0,
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2.0,
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NAN,
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INFINITY,
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-INFINITY,
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};
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char* fmt(double g) {
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static char buf[10][30];
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static int n;
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char *p;
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p = buf[n++];
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if(n == 10) {
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n = 0;
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}
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sprintf(p, "%g", g);
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if(strcmp(p, "0") == 0) {
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strcpy(p, "zero");
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return p;
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}
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if(strcmp(p, "-0") == 0) {
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strcpy(p, "-zero");
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return p;
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}
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return p;
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}
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int main(void) {
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int i, j, k, l;
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double complex n, d, q;
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printf("// skip\n");
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printf("// # generated by cmplxdivide.c\n");
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printf("\n");
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printf("package main\n");
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printf("\n");
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printf("import \"math\"\n");
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printf("\n");
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printf("var (\n");
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printf("\tnan = math.NaN()\n");
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printf("\tinf = math.Inf(1)\n");
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printf("\tzero = 0.0\n");
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printf(")\n");
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printf("\n");
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printf("var tests = []struct {\n");
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printf("\tf, g complex128\n");
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printf("\tout complex128\n");
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printf("}{\n");
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for(i=0; i<nelem(f); i++)
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for(j=0; j<nelem(f); j++)
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for(k=0; k<nelem(f); k++)
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for(l=0; l<nelem(f); l++) {
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n = f[i] + f[j]*I;
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d = f[k] + f[l]*I;
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q = n/d;
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printf("\t{complex(%s, %s), complex(%s, %s), complex(%s, %s)},\n",
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fmt(creal(n)), fmt(cimag(n)),
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fmt(creal(d)), fmt(cimag(d)),
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fmt(creal(q)), fmt(cimag(q)));
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}
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printf("}\n");
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return 0;
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}
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