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target/arm: Convert VNEG to decodetree

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Convert the VNEG instruction to decodetree.

Backports commit 1882651afdb0ca44f0631192fbe65a71c660d809 from qemu
This commit is contained in:
Peter Maydell 2019-06-13 18:43:49 -04:00 committed by Lioncash
parent 1032d86ad3
commit 7aea3da6b7
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 16 additions and 5 deletions
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10
qemu/target/arm/translate-vfp.inc.c
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@ -1923,3 +1923,13 @@ static bool trans_VABS_dp(DisasContext *s, arg_VABS_dp *a)
{
return do_vfp_2op_dp(s, gen_helper_vfp_absd, a->vd, a->vm);
}
static bool trans_VNEG_sp(DisasContext *s, arg_VNEG_sp *a)
{
return do_vfp_2op_sp(s, gen_helper_vfp_negs, a->vd, a->vm);
}
static bool trans_VNEG_dp(DisasContext *s, arg_VNEG_dp *a)
{
return do_vfp_2op_dp(s, gen_helper_vfp_negd, a->vd, a->vm);
}

6
qemu/target/arm/translate.c
View file

@ -3199,7 +3199,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
return 1;
case 15:
switch (rn) {
case 1:
case 1 ... 2:
/* Already handled by decodetree */
return 1;
default:
@ -3213,7 +3213,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
/* rn is opcode, encoded as per VFP_SREG_N. */
switch (rn) {
case 0x00: /* vmov */
case 0x02: /* vneg */
case 0x03: /* vsqrt */
break;
@ -3392,9 +3391,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
case 0: /* cpy */
/* no-op */
break;
case 2: /* neg */
gen_vfp_neg(s, dp);
break;
case 3: /* sqrt */
gen_vfp_sqrt(s, dp);
break;

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

@ -161,3 +161,8 @@ VABS_sp ---- 1110 1.11 0000 .... 1010 11.0 .... \
vd=%vd_sp vm=%vm_sp
VABS_dp ---- 1110 1.11 0000 .... 1011 11.0 .... \
vd=%vd_dp vm=%vm_dp
VNEG_sp ---- 1110 1.11 0001 .... 1010 01.0 .... \
vd=%vd_sp vm=%vm_sp
VNEG_dp ---- 1110 1.11 0001 .... 1011 01.0 .... \
vd=%vd_dp vm=%vm_dp