motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-05 00:33:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target/ppc: Add helper for frsqrtes

Browse source 
There is no double-rounding bug here, because the result is
merely an estimate to within 1 part in 32, but perform the
operation with float64r32_div for consistency.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211119160502.17432-33-richard.henderson@linaro.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Richard Henderson 2021-12-17 17:57:16 +01:00 • committed by Cédric Le Goater
parent 7f87214e3b
commit dedbfda765
3 changed files with 21 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

19
target/ppc/fpu_helper.c
View file

@ -896,6 +896,25 @@ float64 helper_frsqrte(CPUPPCState *env, float64 arg)
return retd;
}
/* frsqrtes - frsqrtes. */
float64 helper_frsqrtes(CPUPPCState *env, float64 arg)
{
/* "Estimate" the reciprocal with actual division. */
float64 rets = float64_sqrt(arg, &env->fp_status);
float64 retd = float64r32_div(float64_one, rets, &env->fp_status);
int flags = get_float_exception_flags(&env->fp_status);
if (unlikely(flags & float_flag_invalid)) {
float_invalid_op_sqrt(env, flags, 1, GETPC());
}
if (unlikely(flags & float_flag_divbyzero)) {
/* Reciprocal of (square root of) zero. */
float_zero_divide_excp(env, GETPC());
}
return retd;
}
/* fsel - fsel. */
uint64_t helper_fsel(CPUPPCState *env, uint64_t arg1, uint64_t arg2,
uint64_t arg3)