2 * Copyright (c) 2008 David Schultz <das@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * Tests for fma{,f,l}().
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
41 #include "test-utils.h"
43 #pragma STDC FENV_ACCESS ON
46 * Test that a function returns the correct value and sets the
47 * exception flags correctly. The exceptmask specifies which
48 * exceptions we should check. We need to be lenient for several
49 * reasons, but mainly because on some architectures it's impossible
50 * to raise FE_OVERFLOW without raising FE_INEXACT.
52 * These are macros instead of functions so that assert provides more
53 * meaningful error messages.
55 #define test(func, x, y, z, result, exceptmask, excepts) do { \
56 volatile long double _vx = (x), _vy = (y), _vz = (z); \
57 assert(feclearexcept(FE_ALL_EXCEPT) == 0); \
58 assert(fpequal((func)(_vx, _vy, _vz), (result))); \
59 assert(((void)(func), fetestexcept(exceptmask) == (excepts))); \
62 #define testall(x, y, z, result, exceptmask, excepts) do { \
63 test(fma, (double)(x), (double)(y), (double)(z), \
64 (double)(result), (exceptmask), (excepts)); \
65 test(fmaf, (float)(x), (float)(y), (float)(z), \
66 (float)(result), (exceptmask), (excepts)); \
67 test(fmal, (x), (y), (z), (result), (exceptmask), (excepts)); \
70 /* Test in all rounding modes. */
71 #define testrnd(func, x, y, z, rn, ru, rd, rz, exceptmask, excepts) do { \
72 fesetround(FE_TONEAREST); \
73 test((func), (x), (y), (z), (rn), (exceptmask), (excepts)); \
74 fesetround(FE_UPWARD); \
75 test((func), (x), (y), (z), (ru), (exceptmask), (excepts)); \
76 fesetround(FE_DOWNWARD); \
77 test((func), (x), (y), (z), (rd), (exceptmask), (excepts)); \
78 fesetround(FE_TOWARDZERO); \
79 test((func), (x), (y), (z), (rz), (exceptmask), (excepts)); \
83 * This is needed because clang constant-folds fma in ways that are incorrect
84 * in rounding modes other than FE_TONEAREST.
86 volatile double one = 1.0;
91 const int rd = (fegetround() == FE_DOWNWARD);
93 testall(0.0, 0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
94 testall(1.0, 0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
95 testall(0.0, 1.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
96 testall(0.0, 0.0, 1.0, 1.0, ALL_STD_EXCEPT, 0);
98 testall(-0.0, 0.0, 0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
99 testall(0.0, -0.0, 0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
100 testall(-0.0, -0.0, 0.0, 0.0, ALL_STD_EXCEPT, 0);
101 testall(0.0, 0.0, -0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
102 testall(-0.0, -0.0, -0.0, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
104 testall(-0.0, 0.0, -0.0, -0.0, ALL_STD_EXCEPT, 0);
105 testall(0.0, -0.0, -0.0, -0.0, ALL_STD_EXCEPT, 0);
107 testall(-one, one, one, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
108 testall(one, -one, one, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
109 testall(-one, -one, -one, rd ? -0.0 : 0.0, ALL_STD_EXCEPT, 0);
111 switch (fegetround()) {
114 test(fmaf, -FLT_MIN, FLT_MIN, 0.0, -0.0,
115 ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
116 test(fma, -DBL_MIN, DBL_MIN, 0.0, -0.0,
117 ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
118 test(fmal, -LDBL_MIN, LDBL_MIN, 0.0, -0.0,
119 ALL_STD_EXCEPT, FE_INEXACT | FE_UNDERFLOW);
124 test_infinities(void)
127 testall(INFINITY, 1.0, -1.0, INFINITY, ALL_STD_EXCEPT, 0);
128 testall(-1.0, INFINITY, 0.0, -INFINITY, ALL_STD_EXCEPT, 0);
129 testall(0.0, 0.0, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
130 testall(1.0, 1.0, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
131 testall(1.0, 1.0, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
133 testall(INFINITY, -INFINITY, 1.0, -INFINITY, ALL_STD_EXCEPT, 0);
134 testall(INFINITY, INFINITY, 1.0, INFINITY, ALL_STD_EXCEPT, 0);
135 testall(-INFINITY, -INFINITY, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
137 testall(0.0, INFINITY, 1.0, NAN, ALL_STD_EXCEPT, FE_INVALID);
138 testall(INFINITY, 0.0, -0.0, NAN, ALL_STD_EXCEPT, FE_INVALID);
140 /* The invalid exception is optional in this case. */
141 testall(INFINITY, 0.0, NAN, NAN, ALL_STD_EXCEPT & ~FE_INVALID, 0);
143 testall(INFINITY, INFINITY, -INFINITY, NAN,
144 ALL_STD_EXCEPT, FE_INVALID);
145 testall(-INFINITY, INFINITY, INFINITY, NAN,
146 ALL_STD_EXCEPT, FE_INVALID);
147 testall(INFINITY, -1.0, INFINITY, NAN,
148 ALL_STD_EXCEPT, FE_INVALID);
150 test(fmaf, FLT_MAX, FLT_MAX, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
151 test(fma, DBL_MAX, DBL_MAX, -INFINITY, -INFINITY, ALL_STD_EXCEPT, 0);
152 test(fmal, LDBL_MAX, LDBL_MAX, -INFINITY, -INFINITY,
154 test(fmaf, FLT_MAX, -FLT_MAX, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
155 test(fma, DBL_MAX, -DBL_MAX, INFINITY, INFINITY, ALL_STD_EXCEPT, 0);
156 test(fmal, LDBL_MAX, -LDBL_MAX, INFINITY, INFINITY,
164 testall(NAN, 0.0, 0.0, NAN, ALL_STD_EXCEPT, 0);
165 testall(1.0, NAN, 1.0, NAN, ALL_STD_EXCEPT, 0);
166 testall(1.0, -1.0, NAN, NAN, ALL_STD_EXCEPT, 0);
167 testall(0.0, 0.0, NAN, NAN, ALL_STD_EXCEPT, 0);
168 testall(NAN, NAN, NAN, NAN, ALL_STD_EXCEPT, 0);
170 /* x*y should not raise an inexact/overflow/underflow if z is NaN. */
171 testall(M_PI, M_PI, NAN, NAN, ALL_STD_EXCEPT, 0);
172 test(fmaf, FLT_MIN, FLT_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
173 test(fma, DBL_MIN, DBL_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
174 test(fmal, LDBL_MIN, LDBL_MIN, NAN, NAN, ALL_STD_EXCEPT, 0);
175 test(fmaf, FLT_MAX, FLT_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
176 test(fma, DBL_MAX, DBL_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
177 test(fmal, LDBL_MAX, LDBL_MAX, NAN, NAN, ALL_STD_EXCEPT, 0);
181 * Tests for cases where z is very small compared to x*y.
187 /* x*y positive, z positive */
188 if (fegetround() == FE_UPWARD) {
189 test(fmaf, one, one, 0x1.0p-100, 1.0 + FLT_EPSILON,
190 ALL_STD_EXCEPT, FE_INEXACT);
191 test(fma, one, one, 0x1.0p-200, 1.0 + DBL_EPSILON,
192 ALL_STD_EXCEPT, FE_INEXACT);
193 test(fmal, one, one, 0x1.0p-200, 1.0 + LDBL_EPSILON,
194 ALL_STD_EXCEPT, FE_INEXACT);
196 testall(0x1.0p100, one, 0x1.0p-100, 0x1.0p100,
197 ALL_STD_EXCEPT, FE_INEXACT);
200 /* x*y negative, z negative */
201 if (fegetround() == FE_DOWNWARD) {
202 test(fmaf, -one, one, -0x1.0p-100, -(1.0 + FLT_EPSILON),
203 ALL_STD_EXCEPT, FE_INEXACT);
204 test(fma, -one, one, -0x1.0p-200, -(1.0 + DBL_EPSILON),
205 ALL_STD_EXCEPT, FE_INEXACT);
206 test(fmal, -one, one, -0x1.0p-200, -(1.0 + LDBL_EPSILON),
207 ALL_STD_EXCEPT, FE_INEXACT);
209 testall(0x1.0p100, -one, -0x1.0p-100, -0x1.0p100,
210 ALL_STD_EXCEPT, FE_INEXACT);
213 /* x*y positive, z negative */
214 if (fegetround() == FE_DOWNWARD || fegetround() == FE_TOWARDZERO) {
215 test(fmaf, one, one, -0x1.0p-100, 1.0 - FLT_EPSILON / 2,
216 ALL_STD_EXCEPT, FE_INEXACT);
217 test(fma, one, one, -0x1.0p-200, 1.0 - DBL_EPSILON / 2,
218 ALL_STD_EXCEPT, FE_INEXACT);
219 test(fmal, one, one, -0x1.0p-200, 1.0 - LDBL_EPSILON / 2,
220 ALL_STD_EXCEPT, FE_INEXACT);
222 testall(0x1.0p100, one, -0x1.0p-100, 0x1.0p100,
223 ALL_STD_EXCEPT, FE_INEXACT);
226 /* x*y negative, z positive */
227 if (fegetround() == FE_UPWARD || fegetround() == FE_TOWARDZERO) {
228 test(fmaf, -one, one, 0x1.0p-100, -1.0 + FLT_EPSILON / 2,
229 ALL_STD_EXCEPT, FE_INEXACT);
230 test(fma, -one, one, 0x1.0p-200, -1.0 + DBL_EPSILON / 2,
231 ALL_STD_EXCEPT, FE_INEXACT);
232 test(fmal, -one, one, 0x1.0p-200, -1.0 + LDBL_EPSILON / 2,
233 ALL_STD_EXCEPT, FE_INEXACT);
235 testall(-0x1.0p100, one, 0x1.0p-100, -0x1.0p100,
236 ALL_STD_EXCEPT, FE_INEXACT);
241 * Tests for cases where z is very large compared to x*y.
247 /* z positive, x*y positive */
248 if (fegetround() == FE_UPWARD) {
249 test(fmaf, 0x1.0p-50, 0x1.0p-50, 1.0, 1.0 + FLT_EPSILON,
250 ALL_STD_EXCEPT, FE_INEXACT);
251 test(fma, 0x1.0p-100, 0x1.0p-100, 1.0, 1.0 + DBL_EPSILON,
252 ALL_STD_EXCEPT, FE_INEXACT);
253 test(fmal, 0x1.0p-100, 0x1.0p-100, 1.0, 1.0 + LDBL_EPSILON,
254 ALL_STD_EXCEPT, FE_INEXACT);
256 testall(-0x1.0p-50, -0x1.0p-50, 0x1.0p100, 0x1.0p100,
257 ALL_STD_EXCEPT, FE_INEXACT);
260 /* z negative, x*y negative */
261 if (fegetround() == FE_DOWNWARD) {
262 test(fmaf, -0x1.0p-50, 0x1.0p-50, -1.0, -(1.0 + FLT_EPSILON),
263 ALL_STD_EXCEPT, FE_INEXACT);
264 test(fma, -0x1.0p-100, 0x1.0p-100, -1.0, -(1.0 + DBL_EPSILON),
265 ALL_STD_EXCEPT, FE_INEXACT);
266 test(fmal, -0x1.0p-100, 0x1.0p-100, -1.0, -(1.0 + LDBL_EPSILON),
267 ALL_STD_EXCEPT, FE_INEXACT);
269 testall(0x1.0p-50, -0x1.0p-50, -0x1.0p100, -0x1.0p100,
270 ALL_STD_EXCEPT, FE_INEXACT);
273 /* z negative, x*y positive */
274 if (fegetround() == FE_UPWARD || fegetround() == FE_TOWARDZERO) {
275 test(fmaf, -0x1.0p-50, -0x1.0p-50, -1.0,
276 -1.0 + FLT_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
277 test(fma, -0x1.0p-100, -0x1.0p-100, -1.0,
278 -1.0 + DBL_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
279 test(fmal, -0x1.0p-100, -0x1.0p-100, -1.0,
280 -1.0 + LDBL_EPSILON / 2, ALL_STD_EXCEPT, FE_INEXACT);
282 testall(0x1.0p-50, 0x1.0p-50, -0x1.0p100, -0x1.0p100,
283 ALL_STD_EXCEPT, FE_INEXACT);
286 /* z positive, x*y negative */
287 if (fegetround() == FE_DOWNWARD || fegetround() == FE_TOWARDZERO) {
288 test(fmaf, 0x1.0p-50, -0x1.0p-50, 1.0, 1.0 - FLT_EPSILON / 2,
289 ALL_STD_EXCEPT, FE_INEXACT);
290 test(fma, 0x1.0p-100, -0x1.0p-100, 1.0, 1.0 - DBL_EPSILON / 2,
291 ALL_STD_EXCEPT, FE_INEXACT);
292 test(fmal, 0x1.0p-100, -0x1.0p-100, 1.0, 1.0 - LDBL_EPSILON / 2,
293 ALL_STD_EXCEPT, FE_INEXACT);
295 testall(-0x1.0p-50, 0x1.0p-50, 0x1.0p100, 0x1.0p100,
296 ALL_STD_EXCEPT, FE_INEXACT);
304 /* ilogb(x*y) - ilogb(z) = 20 */
305 testrnd(fmaf, -0x1.c139d8p-51, -0x1.600e7ap32, 0x1.26558cp-38,
306 0x1.34e48ap-18, 0x1.34e48cp-18, 0x1.34e48ap-18, 0x1.34e48ap-18,
307 ALL_STD_EXCEPT, FE_INEXACT);
308 testrnd(fma, -0x1.c139d7b84f1a3p-51, -0x1.600e7a2a16484p32,
309 0x1.26558cac31580p-38, 0x1.34e48a78aae97p-18,
310 0x1.34e48a78aae97p-18, 0x1.34e48a78aae96p-18,
311 0x1.34e48a78aae96p-18, ALL_STD_EXCEPT, FE_INEXACT);
312 #if LDBL_MANT_DIG == 113
313 testrnd(fmal, -0x1.c139d7b84f1a3079263afcc5bae3p-51L,
314 -0x1.600e7a2a164840edbe2e7d301a72p32L,
315 0x1.26558cac315807eb07e448042101p-38L,
316 0x1.34e48a78aae96c76ed36077dd387p-18L,
317 0x1.34e48a78aae96c76ed36077dd388p-18L,
318 0x1.34e48a78aae96c76ed36077dd387p-18L,
319 0x1.34e48a78aae96c76ed36077dd387p-18L,
320 ALL_STD_EXCEPT, FE_INEXACT);
321 #elif LDBL_MANT_DIG == 64
322 testrnd(fmal, -0x1.c139d7b84f1a307ap-51L, -0x1.600e7a2a164840eep32L,
323 0x1.26558cac315807ecp-38L, 0x1.34e48a78aae96c78p-18L,
324 0x1.34e48a78aae96c78p-18L, 0x1.34e48a78aae96c76p-18L,
325 0x1.34e48a78aae96c76p-18L, ALL_STD_EXCEPT, FE_INEXACT);
326 #elif LDBL_MANT_DIG == 53
327 testrnd(fmal, -0x1.c139d7b84f1a3p-51L, -0x1.600e7a2a16484p32L,
328 0x1.26558cac31580p-38L, 0x1.34e48a78aae97p-18L,
329 0x1.34e48a78aae97p-18L, 0x1.34e48a78aae96p-18L,
330 0x1.34e48a78aae96p-18L, ALL_STD_EXCEPT, FE_INEXACT);
333 /* ilogb(x*y) - ilogb(z) = -40 */
334 testrnd(fmaf, 0x1.98210ap53, 0x1.9556acp-24, 0x1.d87da4p70,
335 0x1.d87da4p70, 0x1.d87da6p70, 0x1.d87da4p70, 0x1.d87da4p70,
336 ALL_STD_EXCEPT, FE_INEXACT);
337 testrnd(fma, 0x1.98210ac83fe2bp53, 0x1.9556ac1475f0fp-24,
338 0x1.d87da3aafc60ep70, 0x1.d87da3aafda40p70,
339 0x1.d87da3aafda40p70, 0x1.d87da3aafda3fp70,
340 0x1.d87da3aafda3fp70, ALL_STD_EXCEPT, FE_INEXACT);
341 #if LDBL_MANT_DIG == 113
342 testrnd(fmal, 0x1.98210ac83fe2a8f65b6278b74cebp53L,
343 0x1.9556ac1475f0f28968b61d0de65ap-24L,
344 0x1.d87da3aafc60d830aa4c6d73b749p70L,
345 0x1.d87da3aafda3f36a69eb86488224p70L,
346 0x1.d87da3aafda3f36a69eb86488225p70L,
347 0x1.d87da3aafda3f36a69eb86488224p70L,
348 0x1.d87da3aafda3f36a69eb86488224p70L,
349 ALL_STD_EXCEPT, FE_INEXACT);
350 #elif LDBL_MANT_DIG == 64
351 testrnd(fmal, 0x1.98210ac83fe2a8f6p53L, 0x1.9556ac1475f0f28ap-24L,
352 0x1.d87da3aafc60d83p70L, 0x1.d87da3aafda3f36ap70L,
353 0x1.d87da3aafda3f36ap70L, 0x1.d87da3aafda3f368p70L,
354 0x1.d87da3aafda3f368p70L, ALL_STD_EXCEPT, FE_INEXACT);
355 #elif LDBL_MANT_DIG == 53
356 testrnd(fmal, 0x1.98210ac83fe2bp53L, 0x1.9556ac1475f0fp-24L,
357 0x1.d87da3aafc60ep70L, 0x1.d87da3aafda40p70L,
358 0x1.d87da3aafda40p70L, 0x1.d87da3aafda3fp70L,
359 0x1.d87da3aafda3fp70L, ALL_STD_EXCEPT, FE_INEXACT);
362 /* ilogb(x*y) - ilogb(z) = 0 */
363 testrnd(fmaf, 0x1.31ad02p+100, 0x1.2fbf7ap-42, -0x1.c3e106p+58,
364 -0x1.64c27cp+56, -0x1.64c27ap+56, -0x1.64c27cp+56,
365 -0x1.64c27ap+56, ALL_STD_EXCEPT, FE_INEXACT);
366 testrnd(fma, 0x1.31ad012ede8aap+100, 0x1.2fbf79c839067p-42,
367 -0x1.c3e106929056ep+58, -0x1.64c282b970a5fp+56,
368 -0x1.64c282b970a5ep+56, -0x1.64c282b970a5fp+56,
369 -0x1.64c282b970a5ep+56, ALL_STD_EXCEPT, FE_INEXACT);
370 #if LDBL_MANT_DIG == 113
371 testrnd(fmal, 0x1.31ad012ede8aa282fa1c19376d16p+100L,
372 0x1.2fbf79c839066f0f5c68f6d2e814p-42L,
373 -0x1.c3e106929056ec19de72bfe64215p+58L,
374 -0x1.64c282b970a612598fc025ca8cddp+56L,
375 -0x1.64c282b970a612598fc025ca8cddp+56L,
376 -0x1.64c282b970a612598fc025ca8cdep+56L,
377 -0x1.64c282b970a612598fc025ca8cddp+56L,
378 ALL_STD_EXCEPT, FE_INEXACT);
379 #elif LDBL_MANT_DIG == 64
380 testrnd(fmal, 0x1.31ad012ede8aa4eap+100L, 0x1.2fbf79c839066aeap-42L,
381 -0x1.c3e106929056e61p+58L, -0x1.64c282b970a60298p+56L,
382 -0x1.64c282b970a60298p+56L, -0x1.64c282b970a6029ap+56L,
383 -0x1.64c282b970a60298p+56L, ALL_STD_EXCEPT, FE_INEXACT);
384 #elif LDBL_MANT_DIG == 53
385 testrnd(fmal, 0x1.31ad012ede8aap+100L, 0x1.2fbf79c839067p-42L,
386 -0x1.c3e106929056ep+58L, -0x1.64c282b970a5fp+56L,
387 -0x1.64c282b970a5ep+56L, -0x1.64c282b970a5fp+56L,
388 -0x1.64c282b970a5ep+56L, ALL_STD_EXCEPT, FE_INEXACT);
391 /* x*y (rounded) ~= -z */
392 /* XXX spurious inexact exceptions */
393 testrnd(fmaf, 0x1.bbffeep-30, -0x1.1d164cp-74, 0x1.ee7296p-104,
394 -0x1.c46ea8p-128, -0x1.c46ea8p-128, -0x1.c46ea8p-128,
395 -0x1.c46ea8p-128, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
396 testrnd(fma, 0x1.bbffeea6fc7d6p-30, 0x1.1d164c6cbf078p-74,
397 -0x1.ee72993aff948p-104, -0x1.71f72ac7d9d8p-159,
398 -0x1.71f72ac7d9d8p-159, -0x1.71f72ac7d9d8p-159,
399 -0x1.71f72ac7d9d8p-159, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
400 #if LDBL_MANT_DIG == 113
401 testrnd(fmal, 0x1.bbffeea6fc7d65927d147f437675p-30L,
402 0x1.1d164c6cbf078b7a22607d1cd6a2p-74L,
403 -0x1.ee72993aff94973876031bec0944p-104L,
404 0x1.64e086175b3a2adc36e607058814p-217L,
405 0x1.64e086175b3a2adc36e607058814p-217L,
406 0x1.64e086175b3a2adc36e607058814p-217L,
407 0x1.64e086175b3a2adc36e607058814p-217L,
408 ALL_STD_EXCEPT & ~FE_INEXACT, 0);
409 #elif LDBL_MANT_DIG == 64
410 testrnd(fmal, 0x1.bbffeea6fc7d6592p-30L, 0x1.1d164c6cbf078b7ap-74L,
411 -0x1.ee72993aff949736p-104L, 0x1.af190e7a1ee6ad94p-168L,
412 0x1.af190e7a1ee6ad94p-168L, 0x1.af190e7a1ee6ad94p-168L,
413 0x1.af190e7a1ee6ad94p-168L, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
414 #elif LDBL_MANT_DIG == 53
415 testrnd(fmal, 0x1.bbffeea6fc7d6p-30L, 0x1.1d164c6cbf078p-74L,
416 -0x1.ee72993aff948p-104L, -0x1.71f72ac7d9d8p-159L,
417 -0x1.71f72ac7d9d8p-159L, -0x1.71f72ac7d9d8p-159L,
418 -0x1.71f72ac7d9d8p-159L, ALL_STD_EXCEPT & ~FE_INEXACT, 0);
423 test_double_rounding(void)
427 * a = 0x1.8000000000001p0
428 * b = 0x1.8000000000001p0
429 * c = -0x0.0000000000000000000000000080...1p+1
430 * a * b = 0x1.2000000000001800000000000080p+1
432 * The correct behavior is to round DOWN to 0x1.2000000000001p+1 in
433 * round-to-nearest mode. An implementation that computes a*b+c in
434 * double+double precision, however, will get 0x1.20000000000018p+1,
437 fesetround(FE_TONEAREST);
438 test(fma, 0x1.8000000000001p0, 0x1.8000000000001p0,
439 -0x1.0000000000001p-104, 0x1.2000000000001p+1,
440 ALL_STD_EXCEPT, FE_INEXACT);
441 fesetround(FE_DOWNWARD);
442 test(fma, 0x1.8000000000001p0, 0x1.8000000000001p0,
443 -0x1.0000000000001p-104, 0x1.2000000000001p+1,
444 ALL_STD_EXCEPT, FE_INEXACT);
445 fesetround(FE_UPWARD);
446 test(fma, 0x1.8000000000001p0, 0x1.8000000000001p0,
447 -0x1.0000000000001p-104, 0x1.2000000000002p+1,
448 ALL_STD_EXCEPT, FE_INEXACT);
450 fesetround(FE_TONEAREST);
451 test(fmaf, 0x1.800002p+0, 0x1.800002p+0, -0x1.000002p-46, 0x1.200002p+1,
452 ALL_STD_EXCEPT, FE_INEXACT);
453 fesetround(FE_DOWNWARD);
454 test(fmaf, 0x1.800002p+0, 0x1.800002p+0, -0x1.000002p-46, 0x1.200002p+1,
455 ALL_STD_EXCEPT, FE_INEXACT);
456 fesetround(FE_UPWARD);
457 test(fmaf, 0x1.800002p+0, 0x1.800002p+0, -0x1.000002p-46, 0x1.200004p+1,
458 ALL_STD_EXCEPT, FE_INEXACT);
460 fesetround(FE_TONEAREST);
461 #if LDBL_MANT_DIG == 64
462 test(fmal, 0x1.4p+0L, 0x1.0000000000000004p+0L, 0x1p-128L,
463 0x1.4000000000000006p+0L, ALL_STD_EXCEPT, FE_INEXACT);
464 #elif LDBL_MANT_DIG == 113
465 test(fmal, 0x1.8000000000000000000000000001p+0L,
466 0x1.8000000000000000000000000001p+0L,
467 -0x1.0000000000000000000000000001p-224L,
468 0x1.2000000000000000000000000001p+1L, ALL_STD_EXCEPT, FE_INEXACT);
474 main(int argc, char *argv[])
476 int rmodes[] = { FE_TONEAREST, FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO };
479 #if defined(__i386__)
480 printf("1..0 # SKIP all testcases fail on i386\n");
486 for (i = 0; i < 4; i++) {
487 fesetround(rmodes[i]);
489 printf("ok %d - fma zeroes\n", i + 1);
492 for (i = 0; i < 4; i++) {
493 fesetround(rmodes[i]);
495 printf("ok %d - fma infinities\n", i + 5);
498 fesetround(FE_TONEAREST);
500 printf("ok 9 - fma NaNs\n");
502 for (i = 0; i < 4; i++) {
503 fesetround(rmodes[i]);
505 printf("ok %d - fma small z\n", i + 10);
508 for (i = 0; i < 4; i++) {
509 fesetround(rmodes[i]);
511 printf("ok %d - fma big z\n", i + 14);
514 fesetround(FE_TONEAREST);
516 printf("ok 18 - fma accuracy\n");
518 test_double_rounding();
519 printf("ok 19 - fma double rounding\n");
523 * - Tests for subnormals
524 * - Cancellation tests (e.g., z = (double)x*y, but x*y is inexact)