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authorThomas Huth <thuth@redhat.com>2016-10-11 08:56:52 +0200
committerThomas Huth <thuth@redhat.com>2016-12-20 21:52:12 +0100
commitfcf5ef2ab52c621a4617ebbef36bf43b4003f4c0 (patch)
tree2b450d96b01455df8ed908bf8f26ddc388a03380 /target-ppc/dfp_helper.c
parent82ecffa8c050bf5bbc13329e9b65eac1caa5b55c (diff)
Move target-* CPU file into a target/ folder
We've currently got 18 architectures in QEMU, and thus 18 target-xxx folders in the root folder of the QEMU source tree. More architectures (e.g. RISC-V, AVR) are likely to be included soon, too, so the main folder of the QEMU sources slowly gets quite overcrowded with the target-xxx folders. To disburden the main folder a little bit, let's move the target-xxx folders into a dedicated target/ folder, so that target-xxx/ simply becomes target/xxx/ instead. Acked-by: Laurent Vivier <laurent@vivier.eu> [m68k part] Acked-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> [tricore part] Acked-by: Michael Walle <michael@walle.cc> [lm32 part] Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> [s390x part] Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> [s390x part] Acked-by: Eduardo Habkost <ehabkost@redhat.com> [i386 part] Acked-by: Artyom Tarasenko <atar4qemu@gmail.com> [sparc part] Acked-by: Richard Henderson <rth@twiddle.net> [alpha part] Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa part] Reviewed-by: David Gibson <david@gibson.dropbear.id.au> [ppc part] Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> [cris&microblaze part] Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> [unicore32 part] Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'target-ppc/dfp_helper.c')
-rw-r--r--target-ppc/dfp_helper.c1331
1 files changed, 0 insertions, 1331 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c
deleted file mode 100644
index 9164fe701b..0000000000
--- a/target-ppc/dfp_helper.c
+++ /dev/null
@@ -1,1331 +0,0 @@
-/*
- * 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 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"
-
-#if defined(HOST_WORDS_BIGENDIAN)
-#define HI_IDX 0
-#define LO_IDX 1
-#else
-#define HI_IDX 1
-#define LO_IDX 0
-#endif
-
-struct PPC_DFP {
- CPUPPCState *env;
- uint64_t t64[2], a64[2], b64[2];
- 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 >> 32) & 0x7) {
- 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, uint64_t *a,
- uint64_t *b, CPUPPCState *env)
-{
- decContextDefault(&dfp->context, DEC_INIT_DECIMAL64);
- dfp_prepare_rounding_mode(&dfp->context, env->fpscr);
- dfp->env = env;
-
- if (a) {
- dfp->a64[0] = *a;
- decimal64ToNumber((decimal64 *)dfp->a64, &dfp->a);
- } else {
- dfp->a64[0] = 0;
- decNumberZero(&dfp->a);
- }
-
- if (b) {
- dfp->b64[0] = *b;
- decimal64ToNumber((decimal64 *)dfp->b64, &dfp->b);
- } else {
- dfp->b64[0] = 0;
- decNumberZero(&dfp->b);
- }
-}
-
-static void dfp_prepare_decimal128(struct PPC_DFP *dfp, uint64_t *a,
- uint64_t *b, CPUPPCState *env)
-{
- decContextDefault(&dfp->context, DEC_INIT_DECIMAL128);
- dfp_prepare_rounding_mode(&dfp->context, env->fpscr);
- dfp->env = env;
-
- if (a) {
- dfp->a64[0] = a[HI_IDX];
- dfp->a64[1] = a[LO_IDX];
- decimal128ToNumber((decimal128 *)dfp->a64, &dfp->a);
- } else {
- dfp->a64[0] = dfp->a64[1] = 0;
- decNumberZero(&dfp->a);
- }
-
- if (b) {
- dfp->b64[0] = b[HI_IDX];
- dfp->b64[1] = b[LO_IDX];
- decimal128ToNumber((decimal128 *)dfp->b64, &dfp->b);
- } else {
- dfp->b64[0] = dfp->b64[1] = 0;
- decNumberZero(&dfp->b);
- }
-}
-
-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 &= ~(0x1F << 12);
- dfp->env->fpscr |= (fprf << 12);
-}
-
-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 &= ~(0xF << 12);
- dfp->env->fpscr |= (dfp->crbf << 12);
-}
-
-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, uint64_t *t, uint64_t *a, uint64_t *b) \
-{ \
- struct PPC_DFP dfp; \
- dfp_prepare_decimal##size(&dfp, a, b, env); \
- dnop(&dfp.t, &dfp.a, &dfp.b, &dfp.context); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, &dfp.context); \
- postprocs(&dfp); \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-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, uint64_t *a, uint64_t *b) \
-{ \
- struct PPC_DFP dfp; \
- dfp_prepare_decimal##size(&dfp, a, b, env); \
- dnop(&dfp.t, &dfp.a, &dfp.b, &dfp.context); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, &dfp.context); \
- 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, uint64_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, uint64_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, uint64_t *a, uint64_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, uint64_t *a, uint64_t *b) \
-{ \
- struct PPC_DFP dfp; \
- unsigned k; \
- \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- \
- k = *a & 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, uint64_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, uint64_t *t, uint64_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); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \
- &dfp.context); \
- QUA_PPs(&dfp); \
- \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-DFP_HELPER_QUAI(dquai, 64)
-DFP_HELPER_QUAI(dquaiq, 128)
-
-#define DFP_HELPER_QUA(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *a, \
- uint64_t *b, uint32_t rmc) \
-{ \
- struct PPC_DFP dfp; \
- \
- dfp_prepare_decimal##size(&dfp, a, b, env); \
- \
- dfp_quantize(rmc, &dfp); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \
- &dfp.context); \
- QUA_PPs(&dfp); \
- \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-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, uint64_t *t, uint64_t *a, \
- uint64_t *b, uint32_t rmc) \
-{ \
- struct PPC_DFP dfp; \
- int32_t ref_sig = *a & 0x3F; \
- int32_t xmax = ((size) == 64) ? 369 : 6111; \
- \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- \
- _dfp_reround(rmc, ref_sig, xmax, &dfp); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \
- &dfp.context); \
- QUA_PPs(&dfp); \
- \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-DFP_HELPER_RRND(drrnd, 64)
-DFP_HELPER_RRND(drrndq, 128)
-
-#define DFP_HELPER_RINT(op, postprocs, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_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); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, &dfp.context); \
- postprocs(&dfp); \
- \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-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, uint64_t *t, uint64_t *b)
-{
- struct PPC_DFP dfp;
- uint32_t b_short = *b;
- dfp_prepare_decimal64(&dfp, 0, 0, env);
- decimal32ToNumber((decimal32 *)&b_short, &dfp.t);
- decimal64FromNumber((decimal64 *)t, &dfp.t, &dfp.context);
- dfp_set_FPRF_from_FRT(&dfp);
-}
-
-void helper_dctqpq(CPUPPCState *env, uint64_t *t, uint64_t *b)
-{
- struct PPC_DFP dfp;
- dfp_prepare_decimal128(&dfp, 0, 0, env);
- decimal64ToNumber((decimal64 *)b, &dfp.t);
-
- dfp_check_for_VXSNAN_and_convert_to_QNaN(&dfp);
- dfp_set_FPRF_from_FRT(&dfp);
-
- decimal128FromNumber((decimal128 *)&dfp.t64, &dfp.t, &dfp.context);
- t[0] = dfp.t64[HI_IDX];
- t[1] = dfp.t64[LO_IDX];
-}
-
-void helper_drsp(CPUPPCState *env, uint64_t *t, uint64_t *b)
-{
- struct PPC_DFP dfp;
- uint32_t t_short = 0;
- 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);
-
- *t = t_short;
-}
-
-void helper_drdpq(CPUPPCState *env, uint64_t *t, uint64_t *b)
-{
- struct PPC_DFP dfp;
- dfp_prepare_decimal128(&dfp, 0, b, env);
- decimal64FromNumber((decimal64 *)&dfp.t64, &dfp.b, &dfp.context);
- decimal64ToNumber((decimal64 *)&dfp.t64, &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);
-
- decimal64FromNumber((decimal64 *)dfp.t64, &dfp.t, &dfp.context);
- t[0] = dfp.t64[0];
- t[1] = 0;
-}
-
-#define DFP_HELPER_CFFIX(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b) \
-{ \
- struct PPC_DFP dfp; \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- decNumberFromInt64(&dfp.t, (int64_t)(*b)); \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, &dfp.context); \
- CFFIX_PPs(&dfp); \
- \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-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)
-
-#define DFP_HELPER_CTFIX(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_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; \
- if (decNumberIsInfinite(&dfp.b)) { \
- dfp.t64[0] = decNumberIsNegative(&dfp.b) ? INT64_MIN : INT64_MAX; \
- } else { /* NaN */ \
- dfp.t64[0] = INT64_MIN; \
- if (decNumberIsSNaN(&dfp.b)) { \
- invalid_flags |= FP_VXSNAN; \
- } \
- } \
- dfp_set_FPSCR_flag(&dfp, invalid_flags, FP_VE); \
- } else if (unlikely(decNumberIsZero(&dfp.b))) { \
- dfp.t64[0] = 0; \
- } else { \
- decNumberToIntegralExact(&dfp.b, &dfp.b, &dfp.context); \
- dfp.t64[0] = decNumberIntegralToInt64(&dfp.b, &dfp.context); \
- if (decContextTestStatus(&dfp.context, DEC_Invalid_operation)) { \
- dfp.t64[0] = decNumberIsNegative(&dfp.b) ? INT64_MIN : INT64_MAX; \
- dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FP_VE); \
- } else { \
- dfp_check_for_XX(&dfp); \
- } \
- } \
- \
- *t = dfp.t64[0]; \
-}
-
-DFP_HELPER_CTFIX(dctfix, 64)
-DFP_HELPER_CTFIX(dctfixq, 128)
-
-static inline void dfp_set_bcd_digit_64(uint64_t *t, uint8_t digit,
- unsigned n)
-{
- *t |= ((uint64_t)(digit & 0xF) << (n << 2));
-}
-
-static inline void dfp_set_bcd_digit_128(uint64_t *t, uint8_t digit,
- unsigned n)
-{
- t[(n & 0x10) ? HI_IDX : LO_IDX] |=
- ((uint64_t)(digit & 0xF) << ((n & 15) << 2));
-}
-
-static inline void dfp_set_sign_64(uint64_t *t, uint8_t sgn)
-{
- *t <<= 4;
- *t |= (sgn & 0xF);
-}
-
-static inline void dfp_set_sign_128(uint64_t *t, uint8_t sgn)
-{
- t[HI_IDX] <<= 4;
- t[HI_IDX] |= (t[LO_IDX] >> 60);
- t[LO_IDX] <<= 4;
- t[LO_IDX] |= (sgn & 0xF);
-}
-
-#define DFP_HELPER_DEDPD(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, uint32_t sp) \
-{ \
- struct PPC_DFP dfp; \
- uint8_t digits[34]; \
- int i, N; \
- \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- \
- decNumberGetBCD(&dfp.b, digits); \
- dfp.t64[0] = dfp.t64[1] = 0; \
- N = dfp.b.digits; \
- \
- for (i = 0; (i < N) && (i < (size)/4); i++) { \
- dfp_set_bcd_digit_##size(dfp.t64, digits[N-i-1], i); \
- } \
- \
- if (sp & 2) { \
- uint8_t sgn; \
- \
- if (decNumberIsNegative(&dfp.b)) { \
- sgn = 0xD; \
- } else { \
- sgn = ((sp & 1) ? 0xF : 0xC); \
- } \
- dfp_set_sign_##size(dfp.t64, sgn); \
- } \
- \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-DFP_HELPER_DEDPD(ddedpd, 64)
-DFP_HELPER_DEDPD(ddedpdq, 128)
-
-static inline uint8_t dfp_get_bcd_digit_64(uint64_t *t, unsigned n)
-{
- return *t >> ((n << 2) & 63) & 15;
-}
-
-static inline uint8_t dfp_get_bcd_digit_128(uint64_t *t, unsigned n)
-{
- return t[(n & 0x10) ? HI_IDX : LO_IDX] >> ((n << 2) & 63) & 15;
-}
-
-#define DFP_HELPER_ENBCD(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, uint32_t s) \
-{ \
- struct PPC_DFP dfp; \
- uint8_t digits[32]; \
- int n = 0, offset = 0, sgn = 0, nonzero = 0; \
- \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- \
- decNumberZero(&dfp.t); \
- \
- if (s) { \
- uint8_t sgnNibble = dfp_get_bcd_digit_##size(dfp.b64, offset++); \
- switch (sgnNibble) { \
- case 0xD: \
- case 0xB: \
- sgn = 1; \
- break; \
- case 0xC: \
- case 0xF: \
- case 0xA: \
- case 0xE: \
- sgn = 0; \
- break; \
- default: \
- dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE); \
- return; \
- } \
- } \
- \
- while (offset < (size)/4) { \
- n++; \
- digits[(size)/4-n] = dfp_get_bcd_digit_##size(dfp.b64, offset++); \
- if (digits[(size)/4-n] > 10) { \
- dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE); \
- return; \
- } else { \
- nonzero |= (digits[(size)/4-n] > 0); \
- } \
- } \
- \
- if (nonzero) { \
- decNumberSetBCD(&dfp.t, digits+((size)/4)-n, n); \
- } \
- \
- if (s && sgn) { \
- dfp.t.bits |= DECNEG; \
- } \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \
- &dfp.context); \
- dfp_set_FPRF_from_FRT(&dfp); \
- if ((size) == 64) { \
- t[0] = dfp.t64[0]; \
- } else if ((size) == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-DFP_HELPER_ENBCD(denbcd, 64)
-DFP_HELPER_ENBCD(denbcdq, 128)
-
-#define DFP_HELPER_XEX(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b) \
-{ \
- struct PPC_DFP dfp; \
- \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- \
- if (unlikely(decNumberIsSpecial(&dfp.b))) { \
- if (decNumberIsInfinite(&dfp.b)) { \
- *t = -1; \
- } else if (decNumberIsSNaN(&dfp.b)) { \
- *t = -3; \
- } else if (decNumberIsQNaN(&dfp.b)) { \
- *t = -2; \
- } else { \
- assert(0); \
- } \
- } else { \
- if ((size) == 64) { \
- *t = dfp.b.exponent + 398; \
- } else if ((size) == 128) { \
- *t = dfp.b.exponent + 6176; \
- } else { \
- assert(0); \
- } \
- } \
-}
-
-DFP_HELPER_XEX(dxex, 64)
-DFP_HELPER_XEX(dxexq, 128)
-
-static void dfp_set_raw_exp_64(uint64_t *t, uint64_t raw)
-{
- *t &= 0x8003ffffffffffffULL;
- *t |= (raw << (63-13));
-}
-
-static void dfp_set_raw_exp_128(uint64_t *t, uint64_t raw)
-{
- t[HI_IDX] &= 0x80003fffffffffffULL;
- t[HI_IDX] |= (raw << (63-17));
-}
-
-#define DFP_HELPER_IEX(op, size) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *a, uint64_t *b) \
-{ \
- struct PPC_DFP dfp; \
- uint64_t raw_qnan, raw_snan, raw_inf, max_exp; \
- int bias; \
- int64_t exp = *((int64_t *)a); \
- \
- dfp_prepare_decimal##size(&dfp, 0, b, env); \
- \
- if ((size) == 64) { \
- max_exp = 767; \
- raw_qnan = 0x1F00; \
- raw_snan = 0x1F80; \
- raw_inf = 0x1E00; \
- bias = 398; \
- } else if ((size) == 128) { \
- max_exp = 12287; \
- raw_qnan = 0x1f000; \
- raw_snan = 0x1f800; \
- raw_inf = 0x1e000; \
- bias = 6176; \
- } else { \
- assert(0); \
- } \
- \
- if (unlikely((exp < 0) || (exp > max_exp))) { \
- dfp.t64[0] = dfp.b64[0]; \
- dfp.t64[1] = dfp.b64[1]; \
- if (exp == -1) { \
- dfp_set_raw_exp_##size(dfp.t64, raw_inf); \
- } else if (exp == -3) { \
- dfp_set_raw_exp_##size(dfp.t64, raw_snan); \
- } else { \
- dfp_set_raw_exp_##size(dfp.t64, raw_qnan); \
- } \
- } else { \
- dfp.t = dfp.b; \
- if (unlikely(decNumberIsSpecial(&dfp.t))) { \
- dfp.t.bits &= ~DECSPECIAL; \
- } \
- dfp.t.exponent = exp - bias; \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \
- &dfp.context); \
- } \
- if (size == 64) { \
- t[0] = dfp.t64[0]; \
- } else if (size == 128) { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-DFP_HELPER_IEX(diex, 64)
-DFP_HELPER_IEX(diexq, 128)
-
-static void dfp_clear_lmd_from_g5msb(uint64_t *t)
-{
-
- /* The most significant 5 bits of the PowerPC DFP format combine bits */
- /* from the left-most decimal digit (LMD) and the biased exponent. */
- /* This routine clears the LMD bits while preserving the exponent */
- /* bits. See "Figure 80: Encoding of bits 0:4 of the G field for */
- /* Finite Numbers" in the Power ISA for additional details. */
-
- uint64_t g5msb = (*t >> 58) & 0x1F;
-
- if ((g5msb >> 3) < 3) { /* LMD in [0-7] ? */
- *t &= ~(7ULL << 58);
- } else {
- switch (g5msb & 7) {
- case 0:
- case 1:
- g5msb = 0;
- break;
- case 2:
- case 3:
- g5msb = 0x8;
- break;
- case 4:
- case 5:
- g5msb = 0x10;
- break;
- case 6:
- g5msb = 0x1E;
- break;
- case 7:
- g5msb = 0x1F;
- break;
- }
-
- *t &= ~(0x1fULL << 58);
- *t |= (g5msb << 58);
- }
-}
-
-#define DFP_HELPER_SHIFT(op, size, shift_left) \
-void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *a, \
- uint32_t sh) \
-{ \
- struct PPC_DFP dfp; \
- unsigned max_digits = ((size) == 64) ? 16 : 34; \
- \
- dfp_prepare_decimal##size(&dfp, a, 0, env); \
- \
- if (sh <= max_digits) { \
- \
- decNumber shd; \
- unsigned special = dfp.a.bits & DECSPECIAL; \
- \
- if (shift_left) { \
- decNumberFromUInt32(&shd, sh); \
- } else { \
- decNumberFromInt32(&shd, -((int32_t)sh)); \
- } \
- \
- dfp.a.bits &= ~DECSPECIAL; \
- decNumberShift(&dfp.t, &dfp.a, &shd, &dfp.context); \
- \
- dfp.t.bits |= special; \
- if (special && (dfp.t.digits >= max_digits)) { \
- dfp.t.digits = max_digits - 1; \
- } \
- \
- decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \
- &dfp.context); \
- } else { \
- if ((size) == 64) { \
- dfp.t64[0] = dfp.a64[0] & 0xFFFC000000000000ULL; \
- dfp_clear_lmd_from_g5msb(dfp.t64); \
- } else { \
- dfp.t64[HI_IDX] = dfp.a64[HI_IDX] & \
- 0xFFFFC00000000000ULL; \
- dfp_clear_lmd_from_g5msb(dfp.t64 + HI_IDX); \
- dfp.t64[LO_IDX] = 0; \
- } \
- } \
- \
- if ((size) == 64) { \
- t[0] = dfp.t64[0]; \
- } else { \
- t[0] = dfp.t64[HI_IDX]; \
- t[1] = dfp.t64[LO_IDX]; \
- } \
-}
-
-DFP_HELPER_SHIFT(dscli, 64, 1)
-DFP_HELPER_SHIFT(dscliq, 128, 1)
-DFP_HELPER_SHIFT(dscri, 64, 0)
-DFP_HELPER_SHIFT(dscriq, 128, 0)
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-30 08:56:13 +0000