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baf410dcca
Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Message-Id: <1457708597-3025-4-git-send-email-kbastian@mail.uni-paderborn.de>
109 lines
4.1 KiB
C
109 lines
4.1 KiB
C
/*
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* TriCore emulation for qemu: fpu helper.
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*
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* Copyright (c) 2016 Bastian Koppelmann University of Paderborn
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#define ADD_NAN 0x7cf00001
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#define DIV_NAN 0x7fc00008
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#define MUL_NAN 0x7fc00002
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#define FPU_FS PSW_USB_C
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#define FPU_FI PSW_USB_V
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#define FPU_FV PSW_USB_SV
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#define FPU_FZ PSW_USB_AV
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#define FPU_FU PSW_USB_SAV
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/* we don't care about input_denormal */
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static inline uint8_t f_get_excp_flags(CPUTriCoreState *env)
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{
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return get_float_exception_flags(&env->fp_status)
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& (float_flag_invalid
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| float_flag_overflow
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| float_flag_underflow
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| float_flag_output_denormal
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| float_flag_divbyzero
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| float_flag_inexact);
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}
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static inline bool f_is_denormal(float32 arg)
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{
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return float32_is_zero_or_denormal(arg) && !float32_is_zero(arg);
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}
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static void f_update_psw_flags(CPUTriCoreState *env, uint8_t flags)
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{
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uint8_t some_excp = 0;
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set_float_exception_flags(0, &env->fp_status);
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if (flags & float_flag_invalid) {
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env->FPU_FI = 1 << 31;
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some_excp = 1;
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}
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if (flags & float_flag_overflow) {
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env->FPU_FV = 1 << 31;
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some_excp = 1;
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}
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if (flags & float_flag_underflow || flags & float_flag_output_denormal) {
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env->FPU_FU = 1 << 31;
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some_excp = 1;
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}
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if (flags & float_flag_divbyzero) {
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env->FPU_FZ = 1 << 31;
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some_excp = 1;
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}
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if (flags & float_flag_inexact || flags & float_flag_output_denormal) {
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env->PSW |= 1 << 26;
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some_excp = 1;
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}
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env->FPU_FS = some_excp;
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}
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#define FADD_SUB(op) \
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uint32_t helper_f##op(CPUTriCoreState *env, uint32_t r1, uint32_t r2) \
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{ \
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float32 arg1 = make_float32(r1); \
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float32 arg2 = make_float32(r2); \
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uint32_t flags; \
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float32 f_result; \
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\
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f_result = float32_##op(arg2, arg1, &env->fp_status); \
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flags = f_get_excp_flags(env); \
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if (flags) { \
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/* If the output is a NaN, but the inputs aren't, \
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we return a unique value. */ \
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if ((flags & float_flag_invalid) \
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&& !float32_is_any_nan(arg1) \
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&& !float32_is_any_nan(arg2)) { \
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f_result = ADD_NAN; \
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} \
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f_update_psw_flags(env, flags); \
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} else { \
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env->FPU_FS = 0; \
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} \
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return (uint32_t)f_result; \
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}
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FADD_SUB(add)
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FADD_SUB(sub)
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