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dfp_helper.c
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/*
* PowerPC Decimal Floating Point (DPF) emulation helpers for QEMU.
*
* Copyright (c) 2014 IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#define DECNUMDIGITS 34
#include "libdecnumber/decContext.h"
#include "libdecnumber/decNumber.h"
#include "libdecnumber/dpd/decimal32.h"
#include "libdecnumber/dpd/decimal64.h"
#include "libdecnumber/dpd/decimal128.h"
static void get_dfp64(ppc_vsr_t *dst, ppc_fprp_t *dfp)
{
dst->VsrD(1) = dfp->VsrD(0);
}
static void get_dfp128(ppc_vsr_t *dst, ppc_fprp_t *dfp)
{
dst->VsrD(0) = dfp[0].VsrD(0);
dst->VsrD(1) = dfp[1].VsrD(0);
}
static void set_dfp64(ppc_fprp_t *dfp, ppc_vsr_t *src)
{
dfp[0].VsrD(0) = src->VsrD(1);
dfp[0].VsrD(1) = 0ULL;
}
static void set_dfp128(ppc_fprp_t *dfp, ppc_vsr_t *src)
{
dfp[0].VsrD(0) = src->VsrD(0);
dfp[1].VsrD(0) = src->VsrD(1);
dfp[0].VsrD(1) = 0ULL;
dfp[1].VsrD(1) = 0ULL;
}
static void set_dfp128_to_avr(ppc_avr_t *dst, ppc_vsr_t *src)
{
*dst = *src;
}
struct PPC_DFP {
CPUPPCState *env;
ppc_vsr_t vt, va, vb;
decNumber t, a, b;
decContext context;
uint8_t crbf;
};
static void dfp_prepare_rounding_mode(decContext *context, uint64_t fpscr)
{
enum rounding rnd;
switch ((fpscr & FP_DRN) >> FPSCR_DRN0) {
case 0:
rnd = DEC_ROUND_HALF_EVEN;
break;
case 1:
rnd = DEC_ROUND_DOWN;
break;
case 2:
rnd = DEC_ROUND_CEILING;
break;
case 3:
rnd = DEC_ROUND_FLOOR;
break;
case 4:
rnd = DEC_ROUND_HALF_UP;
break;
case 5:
rnd = DEC_ROUND_HALF_DOWN;
break;
case 6:
rnd = DEC_ROUND_UP;
break;
case 7:
rnd = DEC_ROUND_05UP;
break;
default:
g_assert_not_reached();
}
decContextSetRounding(context, rnd);
}
static void dfp_set_round_mode_from_immediate(uint8_t r, uint8_t rmc,
struct PPC_DFP *dfp)
{
enum rounding rnd;
if (r == 0) {
switch (rmc & 3) {
case 0:
rnd = DEC_ROUND_HALF_EVEN;
break;
case 1:
rnd = DEC_ROUND_DOWN;
break;
case 2:
rnd = DEC_ROUND_HALF_UP;
break;
case 3: /* use FPSCR rounding mode */
return;
default:
assert(0); /* cannot get here */
}
} else { /* r == 1 */
switch (rmc & 3) {
case 0:
rnd = DEC_ROUND_CEILING;
break;
case 1:
rnd = DEC_ROUND_FLOOR;
break;
case 2:
rnd = DEC_ROUND_UP;
break;
case 3:
rnd = DEC_ROUND_HALF_DOWN;
break;
default:
assert(0); /* cannot get here */
}
}
decContextSetRounding(&dfp->context, rnd);
}
static void dfp_prepare_decimal64(struct PPC_DFP *dfp, ppc_fprp_t *a,
ppc_fprp_t *b, CPUPPCState *env)
{
decContextDefault(&dfp->context, DEC_INIT_DECIMAL64);
dfp_prepare_rounding_mode(&dfp->context, env->fpscr);
dfp->env = env;
if (a) {
get_dfp64(&dfp->va, a);
decimal64ToNumber((decimal64 *)&dfp->va.VsrD(1), &dfp->a);
} else {
dfp->va.VsrD(1) = 0;
decNumberZero(&dfp->a);
}
if (b) {
get_dfp64(&dfp->vb, b);
decimal64ToNumber((decimal64 *)&dfp->vb.VsrD(1), &dfp->b);
} else {
dfp->vb.VsrD(1) = 0;
decNumberZero(&dfp->b);
}
}
static void dfp_prepare_decimal128(struct PPC_DFP *dfp, ppc_fprp_t *a,
ppc_fprp_t *b, CPUPPCState *env)
{
decContextDefault(&dfp->context, DEC_INIT_DECIMAL128);
dfp_prepare_rounding_mode(&dfp->context, env->fpscr);
dfp->env = env;
if (a) {
get_dfp128(&dfp->va, a);
decimal128ToNumber((decimal128 *)&dfp->va, &dfp->a);
} else {
dfp->va.VsrD(0) = dfp->va.VsrD(1) = 0;
decNumberZero(&dfp->a);
}
if (b) {
get_dfp128(&dfp->vb, b);
decimal128ToNumber((decimal128 *)&dfp->vb, &dfp->b);
} else {
dfp->vb.VsrD(0) = dfp->vb.VsrD(1) = 0;
decNumberZero(&dfp->b);
}
}
static void dfp_finalize_decimal64(struct PPC_DFP *dfp)
{
decimal64FromNumber((decimal64 *)&dfp->vt.VsrD(1), &dfp->t, &dfp->context);
}
static void dfp_finalize_decimal128(struct PPC_DFP *dfp)
{
decimal128FromNumber((decimal128 *)&dfp->vt, &dfp->t, &dfp->context);
}
static void dfp_set_FPSCR_flag(struct PPC_DFP *dfp, uint64_t flag,
uint64_t enabled)
{
dfp->env->fpscr |= (flag | FP_FX);
if (dfp->env->fpscr & enabled) {
dfp->env->fpscr |= FP_FEX;
}
}
static void dfp_set_FPRF_from_FRT_with_context(struct PPC_DFP *dfp,
decContext *context)
{
uint64_t fprf = 0;
/* construct FPRF */
switch (decNumberClass(&dfp->t, context)) {
case DEC_CLASS_SNAN:
fprf = 0x01;
break;
case DEC_CLASS_QNAN:
fprf = 0x11;
break;
case DEC_CLASS_NEG_INF:
fprf = 0x09;
break;
case DEC_CLASS_NEG_NORMAL:
fprf = 0x08;
break;
case DEC_CLASS_NEG_SUBNORMAL:
fprf = 0x18;
break;
case DEC_CLASS_NEG_ZERO:
fprf = 0x12;
break;
case DEC_CLASS_POS_ZERO:
fprf = 0x02;
break;
case DEC_CLASS_POS_SUBNORMAL:
fprf = 0x14;
break;
case DEC_CLASS_POS_NORMAL:
fprf = 0x04;
break;
case DEC_CLASS_POS_INF:
fprf = 0x05;
break;
default:
assert(0); /* should never get here */
}
dfp->env->fpscr &= ~FP_FPRF;
dfp->env->fpscr |= (fprf << FPSCR_FPRF);
}
static void dfp_set_FPRF_from_FRT(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT_with_context(dfp, &dfp->context);
}
static void dfp_set_FPRF_from_FRT_short(struct PPC_DFP *dfp)
{
decContext shortContext;
decContextDefault(&shortContext, DEC_INIT_DECIMAL32);
dfp_set_FPRF_from_FRT_with_context(dfp, &shortContext);
}
static void dfp_set_FPRF_from_FRT_long(struct PPC_DFP *dfp)
{
decContext longContext;
decContextDefault(&longContext, DEC_INIT_DECIMAL64);
dfp_set_FPRF_from_FRT_with_context(dfp, &longContext);
}
static void dfp_check_for_OX(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Overflow) {
dfp_set_FPSCR_flag(dfp, FP_OX, FP_OE);
}
}
static void dfp_check_for_UX(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Underflow) {
dfp_set_FPSCR_flag(dfp, FP_UX, FP_UE);
}
}
static void dfp_check_for_XX(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Inexact) {
dfp_set_FPSCR_flag(dfp, FP_XX | FP_FI, FP_XE);
}
}
static void dfp_check_for_ZX(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Division_by_zero) {
dfp_set_FPSCR_flag(dfp, FP_ZX, FP_ZE);
}
}
static void dfp_check_for_VXSNAN(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Invalid_operation) {
if (decNumberIsSNaN(&dfp->a) || decNumberIsSNaN(&dfp->b)) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXSNAN, FP_VE);
}
}
}
static void dfp_check_for_VXSNAN_and_convert_to_QNaN(struct PPC_DFP *dfp)
{
if (decNumberIsSNaN(&dfp->t)) {
dfp->t.bits &= ~DECSNAN;
dfp->t.bits |= DECNAN;
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXSNAN, FP_VE);
}
}
static void dfp_check_for_VXISI(struct PPC_DFP *dfp, int testForSameSign)
{
if (dfp->context.status & DEC_Invalid_operation) {
if (decNumberIsInfinite(&dfp->a) && decNumberIsInfinite(&dfp->b)) {
int same = decNumberClass(&dfp->a, &dfp->context) ==
decNumberClass(&dfp->b, &dfp->context);
if ((same && testForSameSign) || (!same && !testForSameSign)) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXISI, FP_VE);
}
}
}
}
static void dfp_check_for_VXISI_add(struct PPC_DFP *dfp)
{
dfp_check_for_VXISI(dfp, 0);
}
static void dfp_check_for_VXISI_subtract(struct PPC_DFP *dfp)
{
dfp_check_for_VXISI(dfp, 1);
}
static void dfp_check_for_VXIMZ(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Invalid_operation) {
if ((decNumberIsInfinite(&dfp->a) && decNumberIsZero(&dfp->b)) ||
(decNumberIsInfinite(&dfp->b) && decNumberIsZero(&dfp->a))) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIMZ, FP_VE);
}
}
}
static void dfp_check_for_VXZDZ(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Division_undefined) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXZDZ, FP_VE);
}
}
static void dfp_check_for_VXIDI(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Invalid_operation) {
if (decNumberIsInfinite(&dfp->a) && decNumberIsInfinite(&dfp->b)) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXIDI, FP_VE);
}
}
}
static void dfp_check_for_VXVC(struct PPC_DFP *dfp)
{
if (decNumberIsNaN(&dfp->a) || decNumberIsNaN(&dfp->b)) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXVC, FP_VE);
}
}
static void dfp_check_for_VXCVI(struct PPC_DFP *dfp)
{
if ((dfp->context.status & DEC_Invalid_operation) &&
(!decNumberIsSNaN(&dfp->a)) &&
(!decNumberIsSNaN(&dfp->b))) {
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FP_VE);
}
}
static void dfp_set_CRBF_from_T(struct PPC_DFP *dfp)
{
if (decNumberIsNaN(&dfp->t)) {
dfp->crbf = 1;
} else if (decNumberIsZero(&dfp->t)) {
dfp->crbf = 2;
} else if (decNumberIsNegative(&dfp->t)) {
dfp->crbf = 8;
} else {
dfp->crbf = 4;
}
}
static void dfp_set_FPCC_from_CRBF(struct PPC_DFP *dfp)
{
dfp->env->fpscr &= ~FP_FPCC;
dfp->env->fpscr |= (dfp->crbf << FPSCR_FPCC);
}
static inline void dfp_makeQNaN(decNumber *dn)
{
dn->bits &= ~DECSPECIAL;
dn->bits |= DECNAN;
}
static inline int dfp_get_digit(decNumber *dn, int n)
{
assert(DECDPUN == 3);
int unit = n / DECDPUN;
int dig = n % DECDPUN;
switch (dig) {
case 0:
return dn->lsu[unit] % 10;
case 1:
return (dn->lsu[unit] / 10) % 10;
case 2:
return dn->lsu[unit] / 100;
}
g_assert_not_reached();
}
#define DFP_HELPER_TAB(op, dnop, postprocs, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \
ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
dfp_prepare_decimal##size(&dfp, a, b, env); \
dnop(&dfp.t, &dfp.a, &dfp.b, &dfp.context); \
dfp_finalize_decimal##size(&dfp); \
postprocs(&dfp); \
set_dfp##size(t, &dfp.vt); \
}
static void ADD_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_OX(dfp);
dfp_check_for_UX(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
dfp_check_for_VXISI_add(dfp);
}
DFP_HELPER_TAB(DADD, decNumberAdd, ADD_PPs, 64)
DFP_HELPER_TAB(DADDQ, decNumberAdd, ADD_PPs, 128)
static void SUB_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_OX(dfp);
dfp_check_for_UX(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
dfp_check_for_VXISI_subtract(dfp);
}
DFP_HELPER_TAB(DSUB, decNumberSubtract, SUB_PPs, 64)
DFP_HELPER_TAB(DSUBQ, decNumberSubtract, SUB_PPs, 128)
static void MUL_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_OX(dfp);
dfp_check_for_UX(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
dfp_check_for_VXIMZ(dfp);
}
DFP_HELPER_TAB(DMUL, decNumberMultiply, MUL_PPs, 64)
DFP_HELPER_TAB(DMULQ, decNumberMultiply, MUL_PPs, 128)
static void DIV_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_OX(dfp);
dfp_check_for_UX(dfp);
dfp_check_for_ZX(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
dfp_check_for_VXZDZ(dfp);
dfp_check_for_VXIDI(dfp);
}
DFP_HELPER_TAB(DDIV, decNumberDivide, DIV_PPs, 64)
DFP_HELPER_TAB(DDIVQ, decNumberDivide, DIV_PPs, 128)
#define DFP_HELPER_BF_AB(op, dnop, postprocs, size) \
uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
dfp_prepare_decimal##size(&dfp, a, b, env); \
dnop(&dfp.t, &dfp.a, &dfp.b, &dfp.context); \
dfp_finalize_decimal##size(&dfp); \
postprocs(&dfp); \
return dfp.crbf; \
}
static void CMPU_PPs(struct PPC_DFP *dfp)
{
dfp_set_CRBF_from_T(dfp);
dfp_set_FPCC_from_CRBF(dfp);
dfp_check_for_VXSNAN(dfp);
}
DFP_HELPER_BF_AB(DCMPU, decNumberCompare, CMPU_PPs, 64)
DFP_HELPER_BF_AB(DCMPUQ, decNumberCompare, CMPU_PPs, 128)
static void CMPO_PPs(struct PPC_DFP *dfp)
{
dfp_set_CRBF_from_T(dfp);
dfp_set_FPCC_from_CRBF(dfp);
dfp_check_for_VXSNAN(dfp);
dfp_check_for_VXVC(dfp);
}
DFP_HELPER_BF_AB(DCMPO, decNumberCompare, CMPO_PPs, 64)
DFP_HELPER_BF_AB(DCMPOQ, decNumberCompare, CMPO_PPs, 128)
#define DFP_HELPER_TSTDC(op, size) \
uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, uint32_t dcm) \
{ \
struct PPC_DFP dfp; \
int match = 0; \
\
dfp_prepare_decimal##size(&dfp, a, 0, env); \
\
match |= (dcm & 0x20) && decNumberIsZero(&dfp.a); \
match |= (dcm & 0x10) && decNumberIsSubnormal(&dfp.a, &dfp.context); \
match |= (dcm & 0x08) && decNumberIsNormal(&dfp.a, &dfp.context); \
match |= (dcm & 0x04) && decNumberIsInfinite(&dfp.a); \
match |= (dcm & 0x02) && decNumberIsQNaN(&dfp.a); \
match |= (dcm & 0x01) && decNumberIsSNaN(&dfp.a); \
\
if (decNumberIsNegative(&dfp.a)) { \
dfp.crbf = match ? 0xA : 0x8; \
} else { \
dfp.crbf = match ? 0x2 : 0x0; \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTDC(DTSTDC, 64)
DFP_HELPER_TSTDC(DTSTDCQ, 128)
#define DFP_HELPER_TSTDG(op, size) \
uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, uint32_t dcm) \
{ \
struct PPC_DFP dfp; \
int minexp, maxexp, nzero_digits, nzero_idx, is_negative, is_zero, \
is_extreme_exp, is_subnormal, is_normal, leftmost_is_nonzero, \
match; \
\
dfp_prepare_decimal##size(&dfp, a, 0, env); \
\
if ((size) == 64) { \
minexp = -398; \
maxexp = 369; \
nzero_digits = 16; \
nzero_idx = 5; \
} else if ((size) == 128) { \
minexp = -6176; \
maxexp = 6111; \
nzero_digits = 34; \
nzero_idx = 11; \
} \
\
is_negative = decNumberIsNegative(&dfp.a); \
is_zero = decNumberIsZero(&dfp.a); \
is_extreme_exp = (dfp.a.exponent == maxexp) || \
(dfp.a.exponent == minexp); \
is_subnormal = decNumberIsSubnormal(&dfp.a, &dfp.context); \
is_normal = decNumberIsNormal(&dfp.a, &dfp.context); \
leftmost_is_nonzero = (dfp.a.digits == nzero_digits) && \
(dfp.a.lsu[nzero_idx] != 0); \
match = 0; \
\
match |= (dcm & 0x20) && is_zero && !is_extreme_exp; \
match |= (dcm & 0x10) && is_zero && is_extreme_exp; \
match |= (dcm & 0x08) && \
(is_subnormal || (is_normal && is_extreme_exp)); \
match |= (dcm & 0x04) && is_normal && !is_extreme_exp && \
!leftmost_is_nonzero; \
match |= (dcm & 0x02) && is_normal && !is_extreme_exp && \
leftmost_is_nonzero; \
match |= (dcm & 0x01) && decNumberIsSpecial(&dfp.a); \
\
if (is_negative) { \
dfp.crbf = match ? 0xA : 0x8; \
} else { \
dfp.crbf = match ? 0x2 : 0x0; \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTDG(DTSTDG, 64)
DFP_HELPER_TSTDG(DTSTDGQ, 128)
#define DFP_HELPER_TSTEX(op, size) \
uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
int expa, expb, a_is_special, b_is_special; \
\
dfp_prepare_decimal##size(&dfp, a, b, env); \
\
expa = dfp.a.exponent; \
expb = dfp.b.exponent; \
a_is_special = decNumberIsSpecial(&dfp.a); \
b_is_special = decNumberIsSpecial(&dfp.b); \
\
if (a_is_special || b_is_special) { \
int atype = a_is_special ? (decNumberIsNaN(&dfp.a) ? 4 : 2) : 1; \
int btype = b_is_special ? (decNumberIsNaN(&dfp.b) ? 4 : 2) : 1; \
dfp.crbf = (atype ^ btype) ? 0x1 : 0x2; \
} else if (expa < expb) { \
dfp.crbf = 0x8; \
} else if (expa > expb) { \
dfp.crbf = 0x4; \
} else { \
dfp.crbf = 0x2; \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTEX(DTSTEX, 64)
DFP_HELPER_TSTEX(DTSTEXQ, 128)
#define DFP_HELPER_TSTSF(op, size) \
uint32_t helper_##op(CPUPPCState *env, ppc_fprp_t *a, ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
unsigned k; \
ppc_vsr_t va; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
get_dfp64(&va, a); \
k = va.VsrD(1) & 0x3F; \
\
if (unlikely(decNumberIsSpecial(&dfp.b))) { \
dfp.crbf = 1; \
} else if (k == 0) { \
dfp.crbf = 4; \
} else if (unlikely(decNumberIsZero(&dfp.b))) { \
/* Zero has no sig digits */ \
dfp.crbf = 4; \
} else { \
unsigned nsd = dfp.b.digits; \
if (k < nsd) { \
dfp.crbf = 8; \
} else if (k > nsd) { \
dfp.crbf = 4; \
} else { \
dfp.crbf = 2; \
} \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTSF(DTSTSF, 64)
DFP_HELPER_TSTSF(DTSTSFQ, 128)
#define DFP_HELPER_TSTSFI(op, size) \
uint32_t helper_##op(CPUPPCState *env, uint32_t a, ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
unsigned uim; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
uim = a & 0x3F; \
\
if (unlikely(decNumberIsSpecial(&dfp.b))) { \
dfp.crbf = 1; \
} else if (uim == 0) { \
dfp.crbf = 4; \
} else if (unlikely(decNumberIsZero(&dfp.b))) { \
/* Zero has no sig digits */ \
dfp.crbf = 4; \
} else { \
unsigned nsd = dfp.b.digits; \
if (uim < nsd) { \
dfp.crbf = 8; \
} else if (uim > nsd) { \
dfp.crbf = 4; \
} else { \
dfp.crbf = 2; \
} \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTSFI(DTSTSFI, 64)
DFP_HELPER_TSTSFI(DTSTSFIQ, 128)
static void QUA_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
dfp_check_for_VXCVI(dfp);
}
static void dfp_quantize(uint8_t rmc, struct PPC_DFP *dfp)
{
dfp_set_round_mode_from_immediate(0, rmc, dfp);
decNumberQuantize(&dfp->t, &dfp->b, &dfp->a, &dfp->context);
if (decNumberIsSNaN(&dfp->a)) {
dfp->t = dfp->a;
dfp_makeQNaN(&dfp->t);
} else if (decNumberIsSNaN(&dfp->b)) {
dfp->t = dfp->b;
dfp_makeQNaN(&dfp->t);
} else if (decNumberIsQNaN(&dfp->a)) {
dfp->t = dfp->a;
} else if (decNumberIsQNaN(&dfp->b)) {
dfp->t = dfp->b;
}
}
#define DFP_HELPER_QUAI(op, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \
uint32_t te, uint32_t rmc) \
{ \
struct PPC_DFP dfp; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
decNumberFromUInt32(&dfp.a, 1); \
dfp.a.exponent = (int32_t)((int8_t)(te << 3) >> 3); \
\
dfp_quantize(rmc, &dfp); \
dfp_finalize_decimal##size(&dfp); \
QUA_PPs(&dfp); \
\
set_dfp##size(t, &dfp.vt); \
}
DFP_HELPER_QUAI(DQUAI, 64)
DFP_HELPER_QUAI(DQUAIQ, 128)
#define DFP_HELPER_QUA(op, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \
ppc_fprp_t *b, uint32_t rmc) \
{ \
struct PPC_DFP dfp; \
\
dfp_prepare_decimal##size(&dfp, a, b, env); \
\
dfp_quantize(rmc, &dfp); \
dfp_finalize_decimal##size(&dfp); \
QUA_PPs(&dfp); \
\
set_dfp##size(t, &dfp.vt); \
}
DFP_HELPER_QUA(DQUA, 64)
DFP_HELPER_QUA(DQUAQ, 128)
static void _dfp_reround(uint8_t rmc, int32_t ref_sig, int32_t xmax,
struct PPC_DFP *dfp)
{
int msd_orig, msd_rslt;
if (unlikely((ref_sig == 0) || (dfp->b.digits <= ref_sig))) {
dfp->t = dfp->b;
if (decNumberIsSNaN(&dfp->b)) {
dfp_makeQNaN(&dfp->t);
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXSNAN, FPSCR_VE);
}
return;
}
/* Reround is equivalent to quantizing b with 1**E(n) where */
/* n = exp(b) + numDigits(b) - reference_significance. */
decNumberFromUInt32(&dfp->a, 1);
dfp->a.exponent = dfp->b.exponent + dfp->b.digits - ref_sig;
if (unlikely(dfp->a.exponent > xmax)) {
dfp->t.digits = 0;
dfp->t.bits &= ~DECNEG;
dfp_makeQNaN(&dfp->t);
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FPSCR_VE);
return;
}
dfp_quantize(rmc, dfp);
msd_orig = dfp_get_digit(&dfp->b, dfp->b.digits-1);
msd_rslt = dfp_get_digit(&dfp->t, dfp->t.digits-1);
/* If the quantization resulted in rounding up to the next magnitude, */
/* then we need to shift the significand and adjust the exponent. */
if (unlikely((msd_orig == 9) && (msd_rslt == 1))) {
decNumber negone;
decNumberFromInt32(&negone, -1);
decNumberShift(&dfp->t, &dfp->t, &negone, &dfp->context);
dfp->t.exponent++;
if (unlikely(dfp->t.exponent > xmax)) {
dfp_makeQNaN(&dfp->t);
dfp->t.digits = 0;
dfp_set_FPSCR_flag(dfp, FP_VX | FP_VXCVI, FP_VE);
/* Inhibit XX in this case */
decContextClearStatus(&dfp->context, DEC_Inexact);
}
}
}
#define DFP_HELPER_RRND(op, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *a, \
ppc_fprp_t *b, uint32_t rmc) \
{ \
struct PPC_DFP dfp; \
ppc_vsr_t va; \
int32_t ref_sig; \
int32_t xmax = ((size) == 64) ? 369 : 6111; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
get_dfp64(&va, a); \
ref_sig = va.VsrD(1) & 0x3f; \
\
_dfp_reround(rmc, ref_sig, xmax, &dfp); \
dfp_finalize_decimal##size(&dfp); \
QUA_PPs(&dfp); \
\
set_dfp##size(t, &dfp.vt); \
}
DFP_HELPER_RRND(DRRND, 64)
DFP_HELPER_RRND(DRRNDQ, 128)
#define DFP_HELPER_RINT(op, postprocs, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b, \
uint32_t r, uint32_t rmc) \
{ \
struct PPC_DFP dfp; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
dfp_set_round_mode_from_immediate(r, rmc, &dfp); \
decNumberToIntegralExact(&dfp.t, &dfp.b, &dfp.context); \
dfp_finalize_decimal##size(&dfp); \
postprocs(&dfp); \
\
set_dfp##size(t, &dfp.vt); \
}
static void RINTX_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
}
DFP_HELPER_RINT(DRINTX, RINTX_PPs, 64)
DFP_HELPER_RINT(DRINTXQ, RINTX_PPs, 128)
static void RINTN_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_VXSNAN(dfp);
}
DFP_HELPER_RINT(DRINTN, RINTN_PPs, 64)
DFP_HELPER_RINT(DRINTNQ, RINTN_PPs, 128)
void helper_DCTDP(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b)
{
struct PPC_DFP dfp;
ppc_vsr_t vb;
uint32_t b_short;
get_dfp64(&vb, b);
b_short = (uint32_t)vb.VsrD(1);
dfp_prepare_decimal64(&dfp, 0, 0, env);
decimal32ToNumber((decimal32 *)&b_short, &dfp.t);
dfp_finalize_decimal64(&dfp);
set_dfp64(t, &dfp.vt);
dfp_set_FPRF_from_FRT(&dfp);
}
void helper_DCTQPQ(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b)
{
struct PPC_DFP dfp;
ppc_vsr_t vb;
dfp_prepare_decimal128(&dfp, 0, 0, env);
get_dfp64(&vb, b);
decimal64ToNumber((decimal64 *)&vb.VsrD(1), &dfp.t);
dfp_check_for_VXSNAN_and_convert_to_QNaN(&dfp);
dfp_set_FPRF_from_FRT(&dfp);
dfp_finalize_decimal128(&dfp);
set_dfp128(t, &dfp.vt);
}
void helper_DRSP(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b)
{
struct PPC_DFP dfp;
uint32_t t_short = 0;
ppc_vsr_t vt;
dfp_prepare_decimal64(&dfp, 0, b, env);
decimal32FromNumber((decimal32 *)&t_short, &dfp.b, &dfp.context);
decimal32ToNumber((decimal32 *)&t_short, &dfp.t);
dfp_set_FPRF_from_FRT_short(&dfp);
dfp_check_for_OX(&dfp);
dfp_check_for_UX(&dfp);
dfp_check_for_XX(&dfp);
vt.VsrD(1) = (uint64_t)t_short;
set_dfp64(t, &vt);
}
void helper_DRDPQ(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b)
{
struct PPC_DFP dfp;
dfp_prepare_decimal128(&dfp, 0, b, env);
decimal64FromNumber((decimal64 *)&dfp.vt.VsrD(1), &dfp.b, &dfp.context);
decimal64ToNumber((decimal64 *)&dfp.vt.VsrD(1), &dfp.t);
dfp_check_for_VXSNAN_and_convert_to_QNaN(&dfp);
dfp_set_FPRF_from_FRT_long(&dfp);
dfp_check_for_OX(&dfp);
dfp_check_for_UX(&dfp);
dfp_check_for_XX(&dfp);
dfp.vt.VsrD(0) = dfp.vt.VsrD(1) = 0;
dfp_finalize_decimal64(&dfp);
set_dfp128(t, &dfp.vt);
}
#define DFP_HELPER_CFFIX(op, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
ppc_vsr_t vb; \
dfp_prepare_decimal##size(&dfp, 0, b, env); \
get_dfp64(&vb, b); \
decNumberFromInt64(&dfp.t, (int64_t)vb.VsrD(1)); \
dfp_finalize_decimal##size(&dfp); \
CFFIX_PPs(&dfp); \
\
set_dfp##size(t, &dfp.vt); \
}
static void CFFIX_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_XX(dfp);
}
DFP_HELPER_CFFIX(DCFFIX, 64)
DFP_HELPER_CFFIX(DCFFIXQ, 128)
void helper_DCFFIXQQ(CPUPPCState *env, ppc_fprp_t *t, ppc_avr_t *b)
{
struct PPC_DFP dfp;
dfp_prepare_decimal128(&dfp, NULL, NULL, env);
decNumberFromInt128(&dfp.t, (uint64_t)b->VsrD(1), (int64_t)b->VsrD(0));
dfp_finalize_decimal128(&dfp);
CFFIX_PPs(&dfp);
set_dfp128(t, &dfp.vt);
}
#define DFP_HELPER_CTFIX(op, size) \
void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) \
{ \
struct PPC_DFP dfp; \
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
if (unlikely(decNumberIsSpecial(&dfp.b))) { \
uint64_t invalid_flags = FP_VX | FP_VXCVI; \