/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/math.h"
#include "libc/mem/gc.h"
#include "libc/stdio/stdio.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
#include "libc/x/xasprintf.h"

double _exp(double) asm("exp");
float _expf(float) asm("expf");
long double _expl(long double) asm("expl");

TEST(expl, test) {
  EXPECT_STREQ("1", _gc(xdtoal(_expl(0))));
  EXPECT_STREQ("1", _gc(xdtoal(_expl(-0.))));
  EXPECT_STREQ("INFINITY", _gc(xdtoal(_expl(INFINITY))));
  EXPECT_STREQ("0", _gc(xdtoal(_expl(-INFINITY))));
  EXPECT_STREQ("NAN", _gc(xdtoal(_expl(NAN))));
  // EXPECT_STREQ("0", _gc(xdtoal(_expl(-132098844872390))));
  EXPECT_STREQ("INFINITY", _gc(xdtoal(_expl(132098844872390))));
}

TEST(exp, test) {
  EXPECT_STREQ("1", _gc(xdtoa(_exp(0))));
  EXPECT_STREQ("1", _gc(xdtoa(_exp(-0.))));
  EXPECT_STREQ("INFINITY", _gc(xdtoa(_exp(INFINITY))));
  EXPECT_STREQ("0", _gc(xdtoa(_exp(-INFINITY))));
  EXPECT_STREQ("NAN", _gc(xdtoa(_exp(NAN))));
  EXPECT_STREQ("0", _gc(xdtoa(_exp(-132098844872390))));
  EXPECT_STREQ("INFINITY", _gc(xdtoa(_exp(132098844872390))));
}

TEST(expf, test) {
  EXPECT_STREQ("1", _gc(xdtoaf(_expf(0))));
  EXPECT_STREQ("1", _gc(xdtoaf(_expf(-0.))));
  EXPECT_STREQ("INFINITY", _gc(xdtoaf(_expf(INFINITY))));
  EXPECT_STREQ("0", _gc(xdtoaf(_expf(-INFINITY))));
  EXPECT_STREQ("NAN", _gc(xdtoaf(_expf(NAN))));
  EXPECT_STREQ("0", _gc(xdtoaf(_expf(-132098844872390))));
  EXPECT_STREQ("INFINITY", _gc(xdtoaf(_expf(132098844872390))));
}

TEST(exp, fun) {
  ASSERT_STREQ("7.389056", _gc(xasprintf("%f", _exp(2.0))));
  ASSERT_STREQ("6.389056", _gc(xasprintf("%f", expm1(2.0))));
  ASSERT_STREQ("6.389056", _gc(xasprintf("%f", _exp(2.0) - 1.0)));
}

BENCH(expl, bench) {
  EZBENCH2("exp", donothing, _exp(.7));   /*  ~6ns */
  EZBENCH2("expf", donothing, _expf(.7)); /*  ~5ns */
  EZBENCH2("expl", donothing, _expl(.7)); /* ~20ns */
}