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target/arm: Convert VNMUL to decodetree

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Convert the VNMUL instruction to decodetree.

Backports commit 43c4be1236c105090d134540da1036073d157cd4 from qemu
This commit is contained in:
Peter Maydell 2019-06-13 18:14:15 -04:00 committed by Lioncash
parent 2c5e102017
commit 06584edf61
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 30 additions and 6 deletions
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24
qemu/target/arm/translate-vfp.inc.c
View file

@ -1446,3 +1446,27 @@ static bool trans_VMUL_dp(DisasContext *s, arg_VMUL_sp *a)
{
return do_vfp_3op_dp(s, gen_helper_vfp_muld, a->vd, a->vn, a->vm, false);
}
static void gen_VNMUL_sp(TCGContext *tcg_ctx, TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm, TCGv_ptr fpst)
{
/* VNMUL: -(fn * fm) */
gen_helper_vfp_muls(tcg_ctx, vd, vn, vm, fpst);
gen_helper_vfp_negs(tcg_ctx, vd, vd);
}
static bool trans_VNMUL_sp(DisasContext *s, arg_VNMUL_sp *a)
{
return do_vfp_3op_sp(s, gen_VNMUL_sp, a->vd, a->vn, a->vm, false);
}
static void gen_VNMUL_dp(TCGContext *tcg_ctx, TCGv_i64 vd, TCGv_i64 vn, TCGv_i64 vm, TCGv_ptr fpst)
{
/* VNMUL: -(fn * fm) */
gen_helper_vfp_muld(tcg_ctx, vd, vn, vm, fpst);
gen_helper_vfp_negd(tcg_ctx, vd, vd);
}
static bool trans_VNMUL_dp(DisasContext *s, arg_VNMUL_sp *a)
{
return do_vfp_3op_dp(s, gen_VNMUL_dp, a->vd, a->vn, a->vm, false);
}

7
qemu/target/arm/translate.c
View file

@ -1444,7 +1444,6 @@ static inline void gen_vfp_##name(DisasContext *s, int dp)
VFP_OP2(add)
VFP_OP2(sub)
VFP_OP2(mul)
VFP_OP2(div)
#undef VFP_OP2
@ -3214,7 +3213,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
rn = VFP_SREG_N(insn);
switch (op) {
case 0 ... 4:
case 0 ... 5:
/* Already handled by decodetree */
return 1;
default:
@ -3400,10 +3399,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
for (;;) {
/* Perform the calculation. */
switch (op) {
case 5: /* nmul: -(fn * fm) */
gen_vfp_mul(s, dp);
gen_vfp_neg(s, dp);
break;
case 6: /* add: fn + fm */
gen_vfp_add(s, dp);
break;

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

@ -122,3 +122,8 @@ VMUL_sp ---- 1110 0.10 .... .... 1010 .0.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VMUL_dp ---- 1110 0.10 .... .... 1011 .0.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
VNMUL_sp ---- 1110 0.10 .... .... 1010 .1.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMUL_dp ---- 1110 0.10 .... .... 1011 .1.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp