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target/arm: Convert VFP VNMLA to decodetree

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Convert the VFP VNMLA instruction to decodetree.

Backports commit 8a483533adc1bdc2decb8f456dbe930a2d245a8b from qemu
This commit is contained in:
Peter Maydell 2019-06-13 18:09:53 -04:00 committed by Lioncash
parent 638b90de31
commit b26b6a12a2
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 40 additions and 18 deletions
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34
qemu/target/arm/translate-vfp.inc.c
View file

@ -1402,3 +1402,37 @@ static bool trans_VNMLS_dp(DisasContext *s, arg_VNMLS_sp *a)
{
return do_vfp_3op_dp(s, gen_VNMLS_dp, a->vd, a->vn, a->vm, true);
}
static void gen_VNMLA_sp(TCGContext *tcg_ctx, TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm, TCGv_ptr fpst)
{
/* VNMLA: -fd + -(fn * fm) */
TCGv_i32 tmp = tcg_temp_new_i32(tcg_ctx);
gen_helper_vfp_muls(tcg_ctx, tmp, vn, vm, fpst);
gen_helper_vfp_negs(tcg_ctx, tmp, tmp);
gen_helper_vfp_negs(tcg_ctx, vd, vd);
gen_helper_vfp_adds(tcg_ctx, vd, vd, tmp, fpst);
tcg_temp_free_i32(tcg_ctx, tmp);
}
static bool trans_VNMLA_sp(DisasContext *s, arg_VNMLA_sp *a)
{
return do_vfp_3op_sp(s, gen_VNMLA_sp, a->vd, a->vn, a->vm, true);
}
static void gen_VNMLA_dp(TCGContext *tcg_ctx, TCGv_i64 vd, TCGv_i64 vn, TCGv_i64 vm, TCGv_ptr fpst)
{
/* VNMLA: -fd + (fn * fm) */
TCGv_i64 tmp = tcg_temp_new_i64(tcg_ctx);
gen_helper_vfp_muld(tcg_ctx, tmp, vn, vm, fpst);
gen_helper_vfp_negd(tcg_ctx, tmp, tmp);
gen_helper_vfp_negd(tcg_ctx, vd, vd);
gen_helper_vfp_addd(tcg_ctx, vd, vd, tmp, fpst);
tcg_temp_free_i64(tcg_ctx, tmp);
}
static bool trans_VNMLA_dp(DisasContext *s, arg_VNMLA_sp *a)
{
return do_vfp_3op_dp(s, gen_VNMLA_dp, a->vd, a->vn, a->vm, true);
}

19
qemu/target/arm/translate.c
View file

@ -1449,17 +1449,6 @@ VFP_OP2(div)
#undef VFP_OP2
static inline void gen_vfp_F1_neg(DisasContext *s, int dp)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
/* Like gen_vfp_neg() but put result in F1 */
if (dp) {
gen_helper_vfp_negd(tcg_ctx, s->F1d, s->F0d);
} else {
gen_helper_vfp_negs(tcg_ctx, s->F1s, s->F0s);
}
}
static inline void gen_vfp_abs(DisasContext *s, int dp)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
@ -3228,6 +3217,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
case 0:
case 1:
case 2:
case 3:
/* Already handled by decodetree */
return 1;
default:
@ -3413,13 +3403,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
for (;;) {
/* Perform the calculation. */
switch (op) {
case 3: /* VNMLA: -fd + -(fn * fm) */
gen_vfp_mul(s, dp);
gen_vfp_F1_neg(s, dp);
gen_mov_F0_vreg(s, dp, rd);
gen_vfp_neg(s, dp);
gen_vfp_add(s, dp);
break;
case 4: /* mul: fn * fm */
gen_vfp_mul(s, dp);
break;

5
qemu/target/arm/vfp.decode
View file

@ -112,3 +112,8 @@ VNMLS_sp ---- 1110 0.01 .... .... 1010 .0.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMLS_dp ---- 1110 0.01 .... .... 1011 .0.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
VNMLA_sp ---- 1110 0.01 .... .... 1010 .1.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMLA_dp ---- 1110 0.01 .... .... 1011 .1.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp