target/mips/fpu_helper.h

   1 /*
   2  * Helpers for emulation of FPU-related MIPS instructions.
   3  *
   4  *  Copyright (C) 2004-2005  Jocelyn Mayer
   5  *
   6  * SPDX-License-Identifier: LGPL-2.1-or-later
   7  */
   8 #include "fpu/softfloat-helpers.h"
   9 #include "cpu.h"
  10
  11 extern const FloatRoundMode ieee_rm[4];
  12
  13 uint32_t float_class_s(uint32_t arg, float_status *fst);
  14 uint64_t float_class_d(uint64_t arg, float_status *fst);
  15
  16 static inline void restore_rounding_mode(CPUMIPSState *env)
  17 {
  18     set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3],
  19                             &env->active_fpu.fp_status);
  20 }
  21
  22 static inline void restore_flush_mode(CPUMIPSState *env)
  23 {
  24     set_flush_to_zero((env->active_fpu.fcr31 & (1 << FCR31_FS)) != 0,
  25                       &env->active_fpu.fp_status);
  26 }
  27
  28 static inline void restore_snan_bit_mode(CPUMIPSState *env)
  29 {
  30     set_snan_bit_is_one((env->active_fpu.fcr31 & (1 << FCR31_NAN2008)) == 0,
  31                         &env->active_fpu.fp_status);
  32 }
  33
  34 static inline void restore_fp_status(CPUMIPSState *env)
  35 {
  36     restore_rounding_mode(env);
  37     restore_flush_mode(env);
  38     restore_snan_bit_mode(env);
  39 }
  40
  41 /* MSA */
  42
  43 enum CPUMIPSMSADataFormat {
  44     DF_BYTE = 0,
  45     DF_HALF,
  46     DF_WORD,
  47     DF_DOUBLE
  48 };
  49
  50 static inline void restore_msa_fp_status(CPUMIPSState *env)
  51 {
  52     float_status *status = &env->active_tc.msa_fp_status;
  53     int rounding_mode = (env->active_tc.msacsr & MSACSR_RM_MASK) >> MSACSR_RM;
  54     bool flush_to_zero = (env->active_tc.msacsr & MSACSR_FS_MASK) != 0;
  55
  56     set_float_rounding_mode(ieee_rm[rounding_mode], status);
  57     set_flush_to_zero(flush_to_zero, status);
  58     set_flush_inputs_to_zero(flush_to_zero, status);
  59 }