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target/xtensa: implement FPU division and square root

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This does not implement all opcodes related to div/sqrt as specified in
the xtensa ISA, partly because the official specification is not
complete and partly because precise implementation is unnecessarily
complex. Instead instructions specific to the div/sqrt sequences are
implemented differently, most of them as nops, but the results of
div/sqrt sequences is preserved.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2020-03-14 11:13:53 -07:00
parent cfa9f05181
commit f8c6137016
3 changed files with 132 additions and 0 deletions
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24
target/xtensa/fpu_helper.c
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@ -231,6 +231,30 @@ float32 HELPER(msub_s)(CPUXtensaState *env, float32 a, float32 b, float32 c)
&env->fp_status);
}
float64 HELPER(mkdadj_d)(CPUXtensaState *env, float64 a, float64 b)
{
set_use_first_nan(true, &env->fp_status);
return float64_div(b, a, &env->fp_status);
}
float32 HELPER(mkdadj_s)(CPUXtensaState *env, float32 a, float32 b)
{
set_use_first_nan(env->config->use_first_nan, &env->fp_status);
return float32_div(b, a, &env->fp_status);
}
float64 HELPER(mksadj_d)(CPUXtensaState *env, float64 v)
{
set_use_first_nan(true, &env->fp_status);
return float64_sqrt(v, &env->fp_status);
}
float32 HELPER(mksadj_s)(CPUXtensaState *env, float32 v)
{
set_use_first_nan(env->config->use_first_nan, &env->fp_status);
return float32_sqrt(v, &env->fp_status);
}
uint32_t HELPER(ftoi_d)(CPUXtensaState *env, float64 v,
uint32_t rounding_mode, uint32_t scale)
{