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RISC-V FPU Support 

Helper routines for FPU instructions and NaN definitions.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Sagar Karandikar <sagark@eecs.berkeley.edu>
Signed-off-by: Michael Clark <mjc@sifive.com>
This commit is contained in:
Michael Clark 2018-03-03 01:31:10 +13:00
parent 0c3e702aca
commit f798f1e29b
No known key found for this signature in database
GPG Key ID: 6BF1D7B357EF3E4F
2 changed files with 377 additions and 3 deletions
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7
fpu/softfloat-specialize.h
View File

@ -114,7 +114,8 @@ float32 float32_default_nan(float_status *status)
#if defined(TARGET_SPARC) || defined(TARGET_M68K)
return const_float32(0x7FFFFFFF);
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA) || \
defined(TARGET_XTENSA) || defined(TARGET_S390X) || defined(TARGET_TRICORE)
defined(TARGET_XTENSA) || defined(TARGET_S390X) || \
defined(TARGET_TRICORE) || defined(TARGET_RISCV)
return const_float32(0x7FC00000);
#elif defined(TARGET_HPPA)
return const_float32(0x7FA00000);
@ -139,7 +140,7 @@ float64 float64_default_nan(float_status *status)
#if defined(TARGET_SPARC) || defined(TARGET_M68K)
return const_float64(LIT64(0x7FFFFFFFFFFFFFFF));
#elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA) || \
defined(TARGET_S390X)
defined(TARGET_S390X) || defined(TARGET_RISCV)
return const_float64(LIT64(0x7FF8000000000000));
#elif defined(TARGET_HPPA)
return const_float64(LIT64(0x7FF4000000000000));
@ -203,7 +204,7 @@ float128 float128_default_nan(float_status *status)
r.high = LIT64(0x7FFF7FFFFFFFFFFF);
} else {
r.low = LIT64(0x0000000000000000);
#if defined(TARGET_S390X) || defined(TARGET_PPC)
#if defined(TARGET_S390X) || defined(TARGET_PPC) || defined(TARGET_RISCV)
r.high = LIT64(0x7FFF800000000000);
#else
r.high = LIT64(0xFFFF800000000000);

373
target/riscv/fpu_helper.c Normal file
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@ -0,0 +1,373 @@
/*
* RISC-V FPU Emulation Helpers for QEMU.
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include <stdlib.h>
#include "cpu.h"
#include "qemu/host-utils.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
target_ulong cpu_riscv_get_fflags(CPURISCVState *env)
{
int soft = get_float_exception_flags(&env->fp_status);
target_ulong hard = 0;
hard |= (soft & float_flag_inexact) ? FPEXC_NX : 0;
hard |= (soft & float_flag_underflow) ? FPEXC_UF : 0;
hard |= (soft & float_flag_overflow) ? FPEXC_OF : 0;
hard |= (soft & float_flag_divbyzero) ? FPEXC_DZ : 0;
hard |= (soft & float_flag_invalid) ? FPEXC_NV : 0;
return hard;
}
void cpu_riscv_set_fflags(CPURISCVState *env, target_ulong hard)
{
int soft = 0;
soft |= (hard & FPEXC_NX) ? float_flag_inexact : 0;
soft |= (hard & FPEXC_UF) ? float_flag_underflow : 0;
soft |= (hard & FPEXC_OF) ? float_flag_overflow : 0;
soft |= (hard & FPEXC_DZ) ? float_flag_divbyzero : 0;
soft |= (hard & FPEXC_NV) ? float_flag_invalid : 0;
set_float_exception_flags(soft, &env->fp_status);
}
void helper_set_rounding_mode(CPURISCVState *env, uint32_t rm)
{
int softrm;
if (rm == 7) {
rm = env->frm;
}
switch (rm) {
case 0:
softrm = float_round_nearest_even;
break;
case 1:
softrm = float_round_to_zero;
break;
case 2:
softrm = float_round_down;
break;
case 3:
softrm = float_round_up;
break;
case 4:
softrm = float_round_ties_away;
break;
default:
do_raise_exception_err(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
}
set_float_rounding_mode(softrm, &env->fp_status);
}
uint64_t helper_fmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float32_muladd(frs1, frs2, frs3, 0, &env->fp_status);
}
uint64_t helper_fmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float64_muladd(frs1, frs2, frs3, 0, &env->fp_status);
}
uint64_t helper_fmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float32_muladd(frs1, frs2, frs3, float_muladd_negate_c,
&env->fp_status);
}
uint64_t helper_fmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float64_muladd(frs1, frs2, frs3, float_muladd_negate_c,
&env->fp_status);
}
uint64_t helper_fnmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float32_muladd(frs1, frs2, frs3, float_muladd_negate_product,
&env->fp_status);
}
uint64_t helper_fnmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float64_muladd(frs1, frs2, frs3, float_muladd_negate_product,
&env->fp_status);
}
uint64_t helper_fnmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float32_muladd(frs1, frs2, frs3, float_muladd_negate_c |
float_muladd_negate_product, &env->fp_status);
}
uint64_t helper_fnmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
uint64_t frs3)
{
return float64_muladd(frs1, frs2, frs3, float_muladd_negate_c |
float_muladd_negate_product, &env->fp_status);
}
uint64_t helper_fadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_add(frs1, frs2, &env->fp_status);
}
uint64_t helper_fsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_sub(frs1, frs2, &env->fp_status);
}
uint64_t helper_fmul_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_mul(frs1, frs2, &env->fp_status);
}
uint64_t helper_fdiv_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_div(frs1, frs2, &env->fp_status);
}
uint64_t helper_fmin_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_minnum(frs1, frs2, &env->fp_status);
}
uint64_t helper_fmax_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_maxnum(frs1, frs2, &env->fp_status);
}
uint64_t helper_fsqrt_s(CPURISCVState *env, uint64_t frs1)
{
return float32_sqrt(frs1, &env->fp_status);
}
target_ulong helper_fle_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_le(frs1, frs2, &env->fp_status);
}
target_ulong helper_flt_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_lt(frs1, frs2, &env->fp_status);
}
target_ulong helper_feq_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float32_eq_quiet(frs1, frs2, &env->fp_status);
}
target_ulong helper_fcvt_w_s(CPURISCVState *env, uint64_t frs1)
{
return float32_to_int32(frs1, &env->fp_status);
}
target_ulong helper_fcvt_wu_s(CPURISCVState *env, uint64_t frs1)
{
return (int32_t)float32_to_uint32(frs1, &env->fp_status);
}
#if defined(TARGET_RISCV64)
uint64_t helper_fcvt_l_s(CPURISCVState *env, uint64_t frs1)
{
return float32_to_int64(frs1, &env->fp_status);
}
uint64_t helper_fcvt_lu_s(CPURISCVState *env, uint64_t frs1)
{
return float32_to_uint64(frs1, &env->fp_status);
}
#endif
uint64_t helper_fcvt_s_w(CPURISCVState *env, target_ulong rs1)
{
return int32_to_float32((int32_t)rs1, &env->fp_status);
}
uint64_t helper_fcvt_s_wu(CPURISCVState *env, target_ulong rs1)
{
return uint32_to_float32((uint32_t)rs1, &env->fp_status);
}
#if defined(TARGET_RISCV64)
uint64_t helper_fcvt_s_l(CPURISCVState *env, uint64_t rs1)
{
return int64_to_float32(rs1, &env->fp_status);
}
uint64_t helper_fcvt_s_lu(CPURISCVState *env, uint64_t rs1)
{
return uint64_to_float32(rs1, &env->fp_status);
}
#endif
target_ulong helper_fclass_s(uint64_t frs1)
{
float32 f = frs1;
bool sign = float32_is_neg(f);
if (float32_is_infinity(f)) {
return sign ? 1 << 0 : 1 << 7;
} else if (float32_is_zero(f)) {
return sign ? 1 << 3 : 1 << 4;
} else if (float32_is_zero_or_denormal(f)) {
return sign ? 1 << 2 : 1 << 5;
} else if (float32_is_any_nan(f)) {
float_status s = { }; /* for snan_bit_is_one */
return float32_is_quiet_nan(f, &s) ? 1 << 9 : 1 << 8;
} else {
return sign ? 1 << 1 : 1 << 6;
}
}
uint64_t helper_fadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_add(frs1, frs2, &env->fp_status);
}
uint64_t helper_fsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_sub(frs1, frs2, &env->fp_status);
}
uint64_t helper_fmul_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_mul(frs1, frs2, &env->fp_status);
}
uint64_t helper_fdiv_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_div(frs1, frs2, &env->fp_status);
}
uint64_t helper_fmin_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_minnum(frs1, frs2, &env->fp_status);
}
uint64_t helper_fmax_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_maxnum(frs1, frs2, &env->fp_status);
}
uint64_t helper_fcvt_s_d(CPURISCVState *env, uint64_t rs1)
{
rs1 = float64_to_float32(rs1, &env->fp_status);
return float32_maybe_silence_nan(rs1, &env->fp_status);
}
uint64_t helper_fcvt_d_s(CPURISCVState *env, uint64_t rs1)
{
rs1 = float32_to_float64(rs1, &env->fp_status);
return float64_maybe_silence_nan(rs1, &env->fp_status);
}
uint64_t helper_fsqrt_d(CPURISCVState *env, uint64_t frs1)
{
return float64_sqrt(frs1, &env->fp_status);
}
target_ulong helper_fle_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_le(frs1, frs2, &env->fp_status);
}
target_ulong helper_flt_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_lt(frs1, frs2, &env->fp_status);
}
target_ulong helper_feq_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
{
return float64_eq_quiet(frs1, frs2, &env->fp_status);
}
target_ulong helper_fcvt_w_d(CPURISCVState *env, uint64_t frs1)
{
return float64_to_int32(frs1, &env->fp_status);
}
target_ulong helper_fcvt_wu_d(CPURISCVState *env, uint64_t frs1)
{
return (int32_t)float64_to_uint32(frs1, &env->fp_status);
}
#if defined(TARGET_RISCV64)
uint64_t helper_fcvt_l_d(CPURISCVState *env, uint64_t frs1)
{
return float64_to_int64(frs1, &env->fp_status);
}
uint64_t helper_fcvt_lu_d(CPURISCVState *env, uint64_t frs1)
{
return float64_to_uint64(frs1, &env->fp_status);
}
#endif
uint64_t helper_fcvt_d_w(CPURISCVState *env, target_ulong rs1)
{
return int32_to_float64((int32_t)rs1, &env->fp_status);
}
uint64_t helper_fcvt_d_wu(CPURISCVState *env, target_ulong rs1)
{
return uint32_to_float64((uint32_t)rs1, &env->fp_status);
}
#if defined(TARGET_RISCV64)
uint64_t helper_fcvt_d_l(CPURISCVState *env, uint64_t rs1)
{
return int64_to_float64(rs1, &env->fp_status);
}
uint64_t helper_fcvt_d_lu(CPURISCVState *env, uint64_t rs1)
{
return uint64_to_float64(rs1, &env->fp_status);
}
#endif
target_ulong helper_fclass_d(uint64_t frs1)
{
float64 f = frs1;
bool sign = float64_is_neg(f);
if (float64_is_infinity(f)) {
return sign ? 1 << 0 : 1 << 7;
} else if (float64_is_zero(f)) {
return sign ? 1 << 3 : 1 << 4;
} else if (float64_is_zero_or_denormal(f)) {
return sign ? 1 << 2 : 1 << 5;
} else if (float64_is_any_nan(f)) {
float_status s = { }; /* for snan_bit_is_one */
return float64_is_quiet_nan(f, &s) ? 1 << 9 : 1 << 8;
} else {
return sign ? 1 << 1 : 1 << 6;
}
}