motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 15:53:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target/arm: Implement fp16 for Neon VRSQRTS

Browse source 
Convert the Neon VRSQRTS insn to using a gvec helper,
and use this to implement the fp16 case.

As with VRECPS, we adjust the phrasing of the new implementation
slightly so that the fp32 version parallels the fp16 one.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200828183354.27913-35-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-08-28 19:33:43 +01:00
parent ac8c62c4e5
commit 40fde72dda
4 changed files with 34 additions and 36 deletions
Download patch file Download diff file Expand all files Collapse all files

15
target/arm/vfp_helper.c
View file

@ -529,21 +529,6 @@ uint32_t HELPER(vfp_fcvt_f64_to_f16)(float64 a, void *fpstp, uint32_t ahp_mode)
return r;
}
float32 HELPER(rsqrts_f32)(CPUARMState *env, float32 a, float32 b)
{
float_status *s = &env->vfp.standard_fp_status;
float32 product;
if ((float32_is_infinity(a) && float32_is_zero_or_denormal(b)) ||
(float32_is_infinity(b) && float32_is_zero_or_denormal(a))) {
if (!(float32_is_zero(a) || float32_is_zero(b))) {
float_raise(float_flag_input_denormal, s);
}
return float32_one_point_five;
}
product = float32_mul(a, b, s);
return float32_div(float32_sub(float32_three, product, s), float32_two, s);
}
/* NEON helpers. */
/* Constants 256 and 512 are used in some helpers; we avoid relying on