2 * S/390 FPU helper routines
4 * Copyright (c) 2009 Ulrich Hecht
5 * Copyright (c) 2009 Alexander Graf
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
24 #if !defined(CONFIG_USER_ONLY)
25 #include "exec/softmmu_exec.h"
28 /* #define DEBUG_HELPER */
30 #define HELPER_LOG(x...) qemu_log(x)
32 #define HELPER_LOG(x...)
35 #define RET128(F) (env->retxl = F.low, F.high)
37 #define convert_bit(mask, from, to) \
39 ? (mask / (from / to)) & to \
40 : (mask & from) * (to / from))
42 static void ieee_exception(CPUS390XState *env, uint32_t dxc, uintptr_t retaddr)
44 /* Install the DXC code. */
45 env->fpc = (env->fpc & ~0xff00) | (dxc << 8);
47 runtime_exception(env, PGM_DATA, retaddr);
50 /* Should be called after any operation that may raise IEEE exceptions. */
51 static void handle_exceptions(CPUS390XState *env, uintptr_t retaddr)
53 unsigned s390_exc, qemu_exc;
55 /* Get the exceptions raised by the current operation. Reset the
56 fpu_status contents so that the next operation has a clean slate. */
57 qemu_exc = env->fpu_status.float_exception_flags;
61 env->fpu_status.float_exception_flags = 0;
63 /* Convert softfloat exception bits to s390 exception bits. */
65 s390_exc |= convert_bit(qemu_exc, float_flag_invalid, 0x80);
66 s390_exc |= convert_bit(qemu_exc, float_flag_divbyzero, 0x40);
67 s390_exc |= convert_bit(qemu_exc, float_flag_overflow, 0x20);
68 s390_exc |= convert_bit(qemu_exc, float_flag_underflow, 0x10);
69 s390_exc |= convert_bit(qemu_exc, float_flag_inexact, 0x08);
71 /* Install the exceptions that we raised. */
72 env->fpc |= s390_exc << 16;
74 /* Send signals for enabled exceptions. */
75 s390_exc &= env->fpc >> 24;
77 ieee_exception(env, s390_exc, retaddr);
81 static inline int float_comp_to_cc(CPUS390XState *env, int float_compare)
83 switch (float_compare) {
84 case float_relation_equal:
86 case float_relation_less:
88 case float_relation_greater:
90 case float_relation_unordered:
93 cpu_abort(env, "unknown return value for float compare\n");
97 /* condition codes for unary FP ops */
98 uint32_t set_cc_nz_f32(float32 v)
100 if (float32_is_any_nan(v)) {
102 } else if (float32_is_zero(v)) {
104 } else if (float32_is_neg(v)) {
111 uint32_t set_cc_nz_f64(float64 v)
113 if (float64_is_any_nan(v)) {
115 } else if (float64_is_zero(v)) {
117 } else if (float64_is_neg(v)) {
124 uint32_t set_cc_nz_f128(float128 v)
126 if (float128_is_any_nan(v)) {
128 } else if (float128_is_zero(v)) {
130 } else if (float128_is_neg(v)) {
137 /* 32-bit FP addition */
138 uint64_t HELPER(aeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
140 float32 ret = float32_add(f1, f2, &env->fpu_status);
141 handle_exceptions(env, GETPC());
145 /* 64-bit FP addition */
146 uint64_t HELPER(adb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
148 float64 ret = float64_add(f1, f2, &env->fpu_status);
149 handle_exceptions(env, GETPC());
153 /* 128-bit FP addition */
154 uint64_t HELPER(axb)(CPUS390XState *env, uint64_t ah, uint64_t al,
155 uint64_t bh, uint64_t bl)
157 float128 ret = float128_add(make_float128(ah, al),
158 make_float128(bh, bl),
160 handle_exceptions(env, GETPC());
164 /* 32-bit FP subtraction */
165 uint64_t HELPER(seb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
167 float32 ret = float32_sub(f1, f2, &env->fpu_status);
168 handle_exceptions(env, GETPC());
172 /* 64-bit FP subtraction */
173 uint64_t HELPER(sdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
175 float64 ret = float64_sub(f1, f2, &env->fpu_status);
176 handle_exceptions(env, GETPC());
180 /* 128-bit FP subtraction */
181 uint64_t HELPER(sxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
182 uint64_t bh, uint64_t bl)
184 float128 ret = float128_sub(make_float128(ah, al),
185 make_float128(bh, bl),
187 handle_exceptions(env, GETPC());
191 /* 32-bit FP division */
192 uint64_t HELPER(deb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
194 float32 ret = float32_div(f1, f2, &env->fpu_status);
195 handle_exceptions(env, GETPC());
199 /* 64-bit FP division */
200 uint64_t HELPER(ddb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
202 float64 ret = float64_div(f1, f2, &env->fpu_status);
203 handle_exceptions(env, GETPC());
207 /* 128-bit FP division */
208 uint64_t HELPER(dxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
209 uint64_t bh, uint64_t bl)
211 float128 ret = float128_div(make_float128(ah, al),
212 make_float128(bh, bl),
214 handle_exceptions(env, GETPC());
218 /* 32-bit FP multiplication */
219 uint64_t HELPER(meeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
221 float32 ret = float32_mul(f1, f2, &env->fpu_status);
222 handle_exceptions(env, GETPC());
226 /* 64-bit FP multiplication */
227 uint64_t HELPER(mdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
229 float64 ret = float64_mul(f1, f2, &env->fpu_status);
230 handle_exceptions(env, GETPC());
234 /* 64/32-bit FP multiplication */
235 uint64_t HELPER(mdeb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
237 float64 ret = float32_to_float64(f2, &env->fpu_status);
238 ret = float64_mul(f1, ret, &env->fpu_status);
239 handle_exceptions(env, GETPC());
243 /* 128-bit FP multiplication */
244 uint64_t HELPER(mxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
245 uint64_t bh, uint64_t bl)
247 float128 ret = float128_mul(make_float128(ah, al),
248 make_float128(bh, bl),
250 handle_exceptions(env, GETPC());
254 /* 128/64-bit FP multiplication */
255 uint64_t HELPER(mxdb)(CPUS390XState *env, uint64_t ah, uint64_t al,
258 float128 ret = float64_to_float128(f2, &env->fpu_status);
259 ret = float128_mul(make_float128(ah, al), ret, &env->fpu_status);
260 handle_exceptions(env, GETPC());
264 /* convert 32-bit float to 64-bit float */
265 uint64_t HELPER(ldeb)(CPUS390XState *env, uint64_t f2)
267 float64 ret = float32_to_float64(f2, &env->fpu_status);
268 handle_exceptions(env, GETPC());
272 /* convert 128-bit float to 64-bit float */
273 uint64_t HELPER(ldxb)(CPUS390XState *env, uint64_t ah, uint64_t al)
275 float64 ret = float128_to_float64(make_float128(ah, al), &env->fpu_status);
276 handle_exceptions(env, GETPC());
280 /* convert 64-bit float to 128-bit float */
281 uint64_t HELPER(lxdb)(CPUS390XState *env, uint64_t f2)
283 float128 ret = float64_to_float128(f2, &env->fpu_status);
284 handle_exceptions(env, GETPC());
288 /* convert 32-bit float to 128-bit float */
289 uint64_t HELPER(lxeb)(CPUS390XState *env, uint64_t f2)
291 float128 ret = float32_to_float128(f2, &env->fpu_status);
292 handle_exceptions(env, GETPC());
296 /* convert 64-bit float to 32-bit float */
297 uint64_t HELPER(ledb)(CPUS390XState *env, uint64_t f2)
299 float32 ret = float64_to_float32(f2, &env->fpu_status);
300 handle_exceptions(env, GETPC());
304 /* convert 128-bit float to 32-bit float */
305 uint64_t HELPER(lexb)(CPUS390XState *env, uint64_t ah, uint64_t al)
307 float32 ret = float128_to_float32(make_float128(ah, al), &env->fpu_status);
308 handle_exceptions(env, GETPC());
312 /* 32-bit FP compare */
313 uint32_t HELPER(ceb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
315 int cmp = float32_compare_quiet(f1, f2, &env->fpu_status);
316 handle_exceptions(env, GETPC());
317 return float_comp_to_cc(env, cmp);
320 /* 64-bit FP compare */
321 uint32_t HELPER(cdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
323 int cmp = float64_compare_quiet(f1, f2, &env->fpu_status);
324 handle_exceptions(env, GETPC());
325 return float_comp_to_cc(env, cmp);
328 /* 128-bit FP compare */
329 uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
330 uint64_t bh, uint64_t bl)
332 int cmp = float128_compare_quiet(make_float128(ah, al),
333 make_float128(bh, bl),
335 handle_exceptions(env, GETPC());
336 return float_comp_to_cc(env, cmp);
339 static int swap_round_mode(CPUS390XState *env, int m3)
341 int ret = env->fpu_status.float_rounding_mode;
347 /* biased round no nearest */
349 /* round to nearest */
350 set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
354 set_float_rounding_mode(float_round_to_zero, &env->fpu_status);
358 set_float_rounding_mode(float_round_up, &env->fpu_status);
362 set_float_rounding_mode(float_round_down, &env->fpu_status);
368 /* convert 64-bit int to 32-bit float */
369 uint64_t HELPER(cegb)(CPUS390XState *env, int64_t v2, uint32_t m3)
371 int hold = swap_round_mode(env, m3);
372 float32 ret = int64_to_float32(v2, &env->fpu_status);
373 set_float_rounding_mode(hold, &env->fpu_status);
374 handle_exceptions(env, GETPC());
378 /* convert 64-bit int to 64-bit float */
379 uint64_t HELPER(cdgb)(CPUS390XState *env, int64_t v2, uint32_t m3)
381 int hold = swap_round_mode(env, m3);
382 float64 ret = int64_to_float64(v2, &env->fpu_status);
383 set_float_rounding_mode(hold, &env->fpu_status);
384 handle_exceptions(env, GETPC());
388 /* convert 64-bit int to 128-bit float */
389 uint64_t HELPER(cxgb)(CPUS390XState *env, int64_t v2, uint32_t m3)
391 int hold = swap_round_mode(env, m3);
392 float128 ret = int64_to_float128(v2, &env->fpu_status);
393 set_float_rounding_mode(hold, &env->fpu_status);
394 handle_exceptions(env, GETPC());
398 /* convert 32-bit float to 64-bit int */
399 uint64_t HELPER(cgeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
401 int hold = swap_round_mode(env, m3);
402 int64_t ret = float32_to_int64(v2, &env->fpu_status);
403 set_float_rounding_mode(hold, &env->fpu_status);
404 handle_exceptions(env, GETPC());
408 /* convert 64-bit float to 64-bit int */
409 uint64_t HELPER(cgdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
411 int hold = swap_round_mode(env, m3);
412 int64_t ret = float64_to_int64(v2, &env->fpu_status);
413 set_float_rounding_mode(hold, &env->fpu_status);
414 handle_exceptions(env, GETPC());
418 /* convert 128-bit float to 64-bit int */
419 uint64_t HELPER(cgxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
421 int hold = swap_round_mode(env, m3);
422 float128 v2 = make_float128(h, l);
423 int64_t ret = float128_to_int64(v2, &env->fpu_status);
424 set_float_rounding_mode(hold, &env->fpu_status);
425 handle_exceptions(env, GETPC());
429 /* convert 32-bit float to 32-bit int */
430 uint64_t HELPER(cfeb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
432 int hold = swap_round_mode(env, m3);
433 int32_t ret = float32_to_int32(v2, &env->fpu_status);
434 set_float_rounding_mode(hold, &env->fpu_status);
435 handle_exceptions(env, GETPC());
439 /* convert 64-bit float to 32-bit int */
440 uint64_t HELPER(cfdb)(CPUS390XState *env, uint64_t v2, uint32_t m3)
442 int hold = swap_round_mode(env, m3);
443 int32_t ret = float64_to_int32(v2, &env->fpu_status);
444 set_float_rounding_mode(hold, &env->fpu_status);
445 handle_exceptions(env, GETPC());
449 /* convert 128-bit float to 32-bit int */
450 uint64_t HELPER(cfxb)(CPUS390XState *env, uint64_t h, uint64_t l, uint32_t m3)
452 int hold = swap_round_mode(env, m3);
453 float128 v2 = make_float128(h, l);
454 int32_t ret = float128_to_int32(v2, &env->fpu_status);
455 set_float_rounding_mode(hold, &env->fpu_status);
456 handle_exceptions(env, GETPC());
460 /* 32-bit FP multiply and add */
461 uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1,
462 uint64_t f2, uint64_t f3)
464 float32 ret = float32_muladd(f2, f3, f1, 0, &env->fpu_status);
465 handle_exceptions(env, GETPC());
469 /* 64-bit FP multiply and add */
470 uint64_t HELPER(madb)(CPUS390XState *env, uint64_t f1,
471 uint64_t f2, uint64_t f3)
473 float64 ret = float64_muladd(f2, f3, f1, 0, &env->fpu_status);
474 handle_exceptions(env, GETPC());
478 /* 32-bit FP multiply and subtract */
479 uint64_t HELPER(mseb)(CPUS390XState *env, uint64_t f1,
480 uint64_t f2, uint64_t f3)
482 float32 ret = float32_muladd(f2, f3, f1, float_muladd_negate_c,
484 handle_exceptions(env, GETPC());
488 /* 64-bit FP multiply and subtract */
489 uint64_t HELPER(msdb)(CPUS390XState *env, uint64_t f1,
490 uint64_t f2, uint64_t f3)
492 float64 ret = float64_muladd(f2, f3, f1, float_muladd_negate_c,
494 handle_exceptions(env, GETPC());
498 /* test data class 32-bit */
499 uint32_t HELPER(tceb)(uint64_t f1, uint64_t m2)
502 int neg = float32_is_neg(v1);
505 if ((float32_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
506 (float32_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
507 (float32_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
508 (float32_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
510 } else if (m2 & (1 << (9-neg))) {
511 /* assume normalized number */
514 /* FIXME: denormalized? */
518 /* test data class 64-bit */
519 uint32_t HELPER(tcdb)(uint64_t v1, uint64_t m2)
521 int neg = float64_is_neg(v1);
524 if ((float64_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
525 (float64_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
526 (float64_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
527 (float64_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
529 } else if (m2 & (1 << (9-neg))) {
530 /* assume normalized number */
533 /* FIXME: denormalized? */
537 /* test data class 128-bit */
538 uint32_t HELPER(tcxb)(uint64_t ah, uint64_t al, uint64_t m2)
540 float128 v1 = make_float128(ah, al);
541 int neg = float128_is_neg(v1);
544 if ((float128_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
545 (float128_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
546 (float128_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
547 (float128_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
549 } else if (m2 & (1 << (9-neg))) {
550 /* assume normalized number */
553 /* FIXME: denormalized? */
557 /* square root 32-bit */
558 uint64_t HELPER(sqeb)(CPUS390XState *env, uint64_t f2)
560 float32 ret = float32_sqrt(f2, &env->fpu_status);
561 handle_exceptions(env, GETPC());
565 /* square root 64-bit */
566 uint64_t HELPER(sqdb)(CPUS390XState *env, uint64_t f2)
568 float64 ret = float64_sqrt(f2, &env->fpu_status);
569 handle_exceptions(env, GETPC());
573 /* square root 128-bit */
574 uint64_t HELPER(sqxb)(CPUS390XState *env, uint64_t ah, uint64_t al)
576 float128 ret = float128_sqrt(make_float128(ah, al), &env->fpu_status);
577 handle_exceptions(env, GETPC());