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target/arm: Split VFM decode

Browse source 
Passing the raw o1 and o2 fields from the manual is less
instructive than it might be. Do the full decode and let
the trans_* functions pass in booleans to a helper.

Backports commit d486f8308a13543bbcc4887f246e856df991a4bc from qemu
This commit is contained in:
Richard Henderson 2020-03-22 00:07:52 -04:00 committed by Lioncash
parent a445b1dab9
commit 303d922e5d
2 changed files with 55 additions and 14 deletions
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52
qemu/target/arm/translate-vfp.inc.c
View file

@ -1808,7 +1808,7 @@ static bool trans_VDIV_dp(DisasContext *s, arg_VDIV_dp *a)
return do_vfp_3op_dp(s, gen_helper_vfp_divd, a->vd, a->vn, a->vm, false);
}
static bool trans_VFM_sp(DisasContext *s, arg_VFM_sp *a)
static bool do_vfm_sp(DisasContext *s, arg_VFMA_sp *a, bool neg_n, bool neg_d)
{
/*
* VFNMA : fd = muladd(-fd, fn, fm)
@ -1854,12 +1854,12 @@ static bool trans_VFM_sp(DisasContext *s, arg_VFM_sp *a)
neon_load_reg32(s, vn, a->vn);
neon_load_reg32(s, vm, a->vm);
if (a->o2) {
if (neg_n) {
/* VFNMS, VFMS */
gen_helper_vfp_negs(tcg_ctx, vn, vn);
}
neon_load_reg32(s, vd, a->vd);
if (a->o1 & 1) {
if (neg_d) {
/* VFNMA, VFNMS */
gen_helper_vfp_negs(tcg_ctx, vd, vd);
}
@ -1875,7 +1875,27 @@ static bool trans_VFM_sp(DisasContext *s, arg_VFM_sp *a)
return true;
}
static bool trans_VFM_dp(DisasContext *s, arg_VFM_dp *a)
static bool trans_VFMA_sp(DisasContext *s, arg_VFMA_sp *a)
{
return do_vfm_sp(s, a, false, false);
}
static bool trans_VFMS_sp(DisasContext *s, arg_VFMS_sp *a)
{
return do_vfm_sp(s, a, true, false);
}
static bool trans_VFNMA_sp(DisasContext *s, arg_VFNMA_sp *a)
{
return do_vfm_sp(s, a, false, true);
}
static bool trans_VFNMS_sp(DisasContext *s, arg_VFNMS_sp *a)
{
return do_vfm_sp(s, a, true, true);
}
static bool do_vfm_dp(DisasContext *s, arg_VFMA_dp *a, bool neg_n, bool neg_d)
{
/*
* VFNMA : fd = muladd(-fd, fn, fm)
@ -1932,12 +1952,12 @@ static bool trans_VFM_dp(DisasContext *s, arg_VFM_dp *a)
neon_load_reg64(s, vn, a->vn);
neon_load_reg64(s, vm, a->vm);
if (a->o2) {
if (neg_n) {
/* VFNMS, VFMS */
gen_helper_vfp_negd(tcg_ctx, vn, vn);
}
neon_load_reg64(s, vd, a->vd);
if (a->o1 & 1) {
if (neg_d) {
/* VFNMA, VFNMS */
gen_helper_vfp_negd(tcg_ctx, vd, vd);
}
@ -1953,6 +1973,26 @@ static bool trans_VFM_dp(DisasContext *s, arg_VFM_dp *a)
return true;
}
static bool trans_VFMA_dp(DisasContext *s, arg_VFMA_dp *a)
{
return do_vfm_dp(s, a, false, false);
}
static bool trans_VFMS_dp(DisasContext *s, arg_VFMS_dp *a)
{
return do_vfm_dp(s, a, true, false);
}
static bool trans_VFNMA_dp(DisasContext *s, arg_VFNMA_dp *a)
{
return do_vfm_dp(s, a, false, true);
}
static bool trans_VFNMS_dp(DisasContext *s, arg_VFNMS_dp *a)
{
return do_vfm_dp(s, a, true, true);
}
static bool trans_VMOV_imm_sp(DisasContext *s, arg_VMOV_imm_sp *a)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;

17
qemu/target/arm/vfp.decode
View file

@ -130,14 +130,15 @@ VSUB_dp ---- 1110 0.11 .... .... 1011 .1.0 .... @vfp_dnm_d
VDIV_sp ---- 1110 1.00 .... .... 1010 .0.0 .... @vfp_dnm_s
VDIV_dp ---- 1110 1.00 .... .... 1011 .0.0 .... @vfp_dnm_d
VFM_sp ---- 1110 1.01 .... .... 1010 . o2:1 . 0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp o1=1
VFM_dp ---- 1110 1.01 .... .... 1011 . o2:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp o1=1
VFM_sp ---- 1110 1.10 .... .... 1010 . o2:1 . 0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp o1=2
VFM_dp ---- 1110 1.10 .... .... 1011 . o2:1 . 0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp o1=2
VFMA_sp ---- 1110 1.10 .... .... 1010 .0. 0 .... @vfp_dnm_s
VFMS_sp ---- 1110 1.10 .... .... 1010 .1. 0 .... @vfp_dnm_s
VFNMA_sp ---- 1110 1.01 .... .... 1010 .0. 0 .... @vfp_dnm_s
VFNMS_sp ---- 1110 1.01 .... .... 1010 .1. 0 .... @vfp_dnm_s
VFMA_dp ---- 1110 1.10 .... .... 1011 .0.0 .... @vfp_dnm_d
VFMS_dp ---- 1110 1.10 .... .... 1011 .1.0 .... @vfp_dnm_d
VFNMA_dp ---- 1110 1.01 .... .... 1011 .0.0 .... @vfp_dnm_d
VFNMS_dp ---- 1110 1.01 .... .... 1011 .1.0 .... @vfp_dnm_d
VMOV_imm_sp ---- 1110 1.11 .... .... 1010 0000 .... \
vd=%vd_sp imm=%vmov_imm