81ddae7c30
Extract FPU specific helpers from "internal.h" to "fpu_helper.h". Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20201120210844.2625602-2-f4bug@amsat.org>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
|
|
* Helpers for emulation of FPU-related MIPS instructions.
|
|
*
|
|
* Copyright (C) 2004-2005 Jocelyn Mayer
|
|
*
|
|
* SPDX-License-Identifier: LGPL-2.1-or-later
|
|
*/
|
|
#include "fpu/softfloat-helpers.h"
|
|
#include "cpu.h"
|
|
|
|
extern const FloatRoundMode ieee_rm[4];
|
|
|
|
uint32_t float_class_s(uint32_t arg, float_status *fst);
|
|
uint64_t float_class_d(uint64_t arg, float_status *fst);
|
|
|
|
static inline void restore_rounding_mode(CPUMIPSState *env)
|
|
{
|
|
set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3],
|
|
&env->active_fpu.fp_status);
|
|
}
|
|
|
|
static inline void restore_flush_mode(CPUMIPSState *env)
|
|
{
|
|
set_flush_to_zero((env->active_fpu.fcr31 & (1 << FCR31_FS)) != 0,
|
|
&env->active_fpu.fp_status);
|
|
}
|
|
|
|
static inline void restore_snan_bit_mode(CPUMIPSState *env)
|
|
{
|
|
set_snan_bit_is_one((env->active_fpu.fcr31 & (1 << FCR31_NAN2008)) == 0,
|
|
&env->active_fpu.fp_status);
|
|
}
|
|
|
|
static inline void restore_fp_status(CPUMIPSState *env)
|
|
{
|
|
restore_rounding_mode(env);
|
|
restore_flush_mode(env);
|
|
restore_snan_bit_mode(env);
|
|
}
|
|
|
|
/* MSA */
|
|
|
|
enum CPUMIPSMSADataFormat {
|
|
DF_BYTE = 0,
|
|
DF_HALF,
|
|
DF_WORD,
|
|
DF_DOUBLE
|
|
};
|
|
|
|
static inline void restore_msa_fp_status(CPUMIPSState *env)
|
|
{
|
|
float_status *status = &env->active_tc.msa_fp_status;
|
|
int rounding_mode = (env->active_tc.msacsr & MSACSR_RM_MASK) >> MSACSR_RM;
|
|
bool flush_to_zero = (env->active_tc.msacsr & MSACSR_FS_MASK) != 0;
|
|
|
|
set_float_rounding_mode(ieee_rm[rounding_mode], status);
|
|
set_flush_to_zero(flush_to_zero, status);
|
|
set_flush_inputs_to_zero(flush_to_zero, status);
|
|
}
|