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target/arm: Implement fp16 for Neon VMUL, VMLA, VMLS

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Convert the Neon floating-point VMUL, VMLA and VMLS to use gvec,
and use this to implement fp16 support.

Backports fc8ae790311882afa3c7816df004daf978c40e9a
This commit is contained in:
Peter Maydell 2021-03-01 17:55:46 -05:00 committed by Lioncash
parent 8c6affbca4
commit b948636c4a
1 changed files with 58 additions and 57 deletions
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123
qemu/target/arm/translate-neon.inc.c
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@ -2466,70 +2466,71 @@ static bool trans_VMLS_2sc(DisasContext *s, arg_2scalar *a)
return do_2scalar(s, a, opfn[a->size], accfn[a->size]);
}
/*
* Rather than have a float-specific version of do_2scalar just for
* three insns, we wrap a NeonGenTwoSingleOpFn to turn it into
* a NeonGenTwoOpFn.
*/
#define WRAP_FP_FN(WRAPNAME, FUNC) \
static void WRAPNAME(TCGContext *s, TCGv_i32 rd, TCGv_i32 rn, TCGv_i32 rm) \
static bool do_2scalar_fp_vec(DisasContext *s, arg_2scalar *a,
gen_helper_gvec_3_ptr *fn)
{
/* Two registers and a scalar, using gvec */
TCGContext *tcg_ctx = s->uc->tcg_ctx;
int vec_size = a->q ? 16 : 8;
int rd_ofs = neon_reg_offset(a->vd, 0);
int rn_ofs = neon_reg_offset(a->vn, 0);
int rm_ofs;
int idx;
TCGv_ptr fpstatus;
if (!arm_dc_feature(s, ARM_FEATURE_NEON)) {
return false;
}
/* UNDEF accesses to D16-D31 if they don't exist. */
if (!dc_isar_feature(aa32_simd_r32, s) &&
((a->vd | a->vn | a->vm) & 0x10)) {
return false;
}
if (!fn) {
/* Bad size (including size == 3, which is a different insn group) */
return false;
}
if (a->q && ((a->vd | a->vn) & 1)) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
/* a->vm is M:Vm, which encodes both register and index */
idx = extract32(a->vm, a->size + 2, 2);
a->vm = extract32(a->vm, 0, a->size + 2);
rm_ofs = neon_reg_offset(a->vm, 0);
fpstatus = fpstatus_ptr(tcg_ctx, a->size == 1 ? FPST_STD_F16 : FPST_STD);
tcg_gen_gvec_3_ptr(tcg_ctx, rd_ofs, rn_ofs, rm_ofs, fpstatus,
vec_size, vec_size, idx, fn);
tcg_temp_free_ptr(tcg_ctx, fpstatus);
return true;
}
#define DO_VMUL_F_2sc(NAME, FUNC) \
static bool trans_##NAME##_F_2sc(DisasContext *s, arg_2scalar *a) \
{ \
TCGv_ptr fpstatus = fpstatus_ptr(s, FPST_STD); \
FUNC(s, rd, rn, rm, fpstatus); \
tcg_temp_free_ptr(s, fpstatus); \
static gen_helper_gvec_3_ptr * const opfn[] = { \
NULL, \
gen_helper_##FUNC##_h, \
gen_helper_##FUNC##_s, \
NULL, \
}; \
if (a->size == MO_16 && !dc_isar_feature(aa32_fp16_arith, s)) { \
return false; \
} \
return do_2scalar_fp_vec(s, a, opfn[a->size]); \
}
WRAP_FP_FN(gen_VMUL_F_mul, gen_helper_vfp_muls)
WRAP_FP_FN(gen_VMUL_F_add, gen_helper_vfp_adds)
WRAP_FP_FN(gen_VMUL_F_sub, gen_helper_vfp_subs)
static bool trans_VMUL_F_2sc(DisasContext *s, arg_2scalar *a)
{
static NeonGenTwoOpFn * const opfn[] = {
NULL,
NULL, /* TODO: fp16 support */
gen_VMUL_F_mul,
NULL,
};
return do_2scalar(s, a, opfn[a->size], NULL);
}
static bool trans_VMLA_F_2sc(DisasContext *s, arg_2scalar *a)
{
static NeonGenTwoOpFn * const opfn[] = {
NULL,
NULL, /* TODO: fp16 support */
gen_VMUL_F_mul,
NULL,
};
static NeonGenTwoOpFn * const accfn[] = {
NULL,
NULL, /* TODO: fp16 support */
gen_VMUL_F_add,
NULL,
};
return do_2scalar(s, a, opfn[a->size], accfn[a->size]);
}
static bool trans_VMLS_F_2sc(DisasContext *s, arg_2scalar *a)
{
static NeonGenTwoOpFn * const opfn[] = {
NULL,
NULL, /* TODO: fp16 support */
gen_VMUL_F_mul,
NULL,
};
static NeonGenTwoOpFn * const accfn[] = {
NULL,
NULL, /* TODO: fp16 support */
gen_VMUL_F_sub,
NULL,
};
return do_2scalar(s, a, opfn[a->size], accfn[a->size]);
}
DO_VMUL_F_2sc(VMUL, gvec_fmul_idx)
DO_VMUL_F_2sc(VMLA, gvec_fmla_nf_idx)
DO_VMUL_F_2sc(VMLS, gvec_fmls_nf_idx)
WRAP_ENV_FN(gen_VQDMULH_16, gen_helper_neon_qdmulh_s16)
WRAP_ENV_FN(gen_VQDMULH_32, gen_helper_neon_qdmulh_s32)