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target/arm: Convert VDIV to decodetree

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Convert the VDIV instruction to decodetree.

Backports commit 519ee7ae31e050eb0ff9ad35c213f0bd7ab1c03e from qemu
This commit is contained in:
Peter Maydell 2019-06-13 18:19:44 -04:00 committed by Lioncash
parent 76c74bc657
commit 321bcc822b
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 15 additions and 21 deletions
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10
qemu/target/arm/translate-vfp.inc.c
View file

@ -1490,3 +1490,13 @@ static bool trans_VSUB_dp(DisasContext *s, arg_VSUB_sp *a)
{
return do_vfp_3op_dp(s, gen_helper_vfp_subd, a->vd, a->vn, a->vm, false);
}
static bool trans_VDIV_sp(DisasContext *s, arg_VDIV_sp *a)
{
return do_vfp_3op_sp(s, gen_helper_vfp_divs, a->vd, a->vn, a->vm, false);
}
static bool trans_VDIV_dp(DisasContext *s, arg_VDIV_sp *a)
{
return do_vfp_3op_dp(s, gen_helper_vfp_divd, a->vd, a->vn, a->vm, false);
}

22
qemu/target/arm/translate.c
View file

@ -1429,23 +1429,6 @@ static TCGv_ptr get_fpstatus_ptr(DisasContext *s, int neon)
return statusptr;
}
#define VFP_OP2(name) \
static inline void gen_vfp_##name(DisasContext *s, int dp) \
{ \
TCGContext *tcg_ctx = s->uc->tcg_ctx; \
TCGv_ptr fpst = get_fpstatus_ptr(s, 0); \
if (dp) { \
gen_helper_vfp_##name##d(tcg_ctx, s->F0d, s->F0d, s->F1d, fpst); \
} else { \
gen_helper_vfp_##name##s(tcg_ctx, s->F0s, s->F0s, s->F1s, fpst); \
} \
tcg_temp_free_ptr(tcg_ctx, fpst); \
}
VFP_OP2(div)
#undef VFP_OP2
static inline void gen_vfp_abs(DisasContext *s, int dp)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
@ -3211,7 +3194,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
rn = VFP_SREG_N(insn);
switch (op) {
case 0 ... 7:
case 0 ... 8:
/* Already handled by decodetree */
return 1;
default:
@ -3397,9 +3380,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
for (;;) {
/* Perform the calculation. */
switch (op) {
case 8: /* div: fn / fm */
gen_vfp_div(s, dp);
break;
case 10: /* VFNMA : fd = muladd(-fd, fn, fm) */
case 11: /* VFNMS : fd = muladd(-fd, -fn, fm) */
case 12: /* VFMA : fd = muladd( fd, fn, fm) */

4
qemu/target/arm/vfp.decode
View file

@ -138,3 +138,7 @@ VSUB_sp ---- 1110 0.11 .... .... 1010 .1.0 .... \
VSUB_dp ---- 1110 0.11 .... .... 1011 .1.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
VDIV_sp ---- 1110 1.00 .... .... 1010 .0.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VDIV_dp ---- 1110 1.00 .... .... 1011 .0.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp