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target/arm: Convert VMUL to decodetree

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Convert the VMUL instruction to decodetree.

Backports commit 88c5188ced60e9f2b8cc3af3b9bc4a8031c8c996 from qemu
This commit is contained in:
Peter Maydell 2019-06-13 18:12:01 -04:00 committed by Lioncash
parent b26b6a12a2
commit 2c5e102017
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 16 additions and 7 deletions
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10
qemu/target/arm/translate-vfp.inc.c
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@ -1436,3 +1436,13 @@ 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);
}
static bool trans_VMUL_sp(DisasContext *s, arg_VMUL_sp *a)
{
return do_vfp_3op_sp(s, gen_helper_vfp_muls, a->vd, a->vn, a->vm, false);
}
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);
}

8
qemu/target/arm/translate.c
View file

@ -3214,10 +3214,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
rn = VFP_SREG_N(insn);
switch (op) {
case 0:
case 1:
case 2:
case 3:
case 0 ... 4:
/* Already handled by decodetree */
return 1;
default:
@ -3403,9 +3400,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
for (;;) {
/* Perform the calculation. */
switch (op) {
case 4: /* mul: fn * fm */
gen_vfp_mul(s, dp);
break;
case 5: /* nmul: -(fn * fm) */
gen_vfp_mul(s, dp);
gen_vfp_neg(s, dp);

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

@ -117,3 +117,8 @@ 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
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