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target/arm: Convert VJCVT to decodetree

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Convert the VJCVT instruction to decodetree.

Backports commit 92073e947487e2109f3dfebfeaa48d6323cbd981 from qemu
This commit is contained in:
Peter Maydell 2019-06-13 19:30:20 -04:00 committed by Lioncash
parent 7be9e6f9b4
commit c66d477359
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 34 additions and 12 deletions
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29
qemu/target/arm/translate-vfp.inc.c
View file

@ -2467,3 +2467,32 @@ static bool trans_VCVT_int_dp(DisasContext *s, arg_VCVT_int_dp *a)
tcg_temp_free_ptr(tcg_ctx, fpst);
return true;
}
static bool trans_VJCVT(DisasContext *s, arg_VJCVT *a)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_i32 vd;
TCGv_i64 vm;
if (!dc_isar_feature(aa32_jscvt, s)) {
return false;
}
/* UNDEF accesses to D16-D31 if they don't exist. */
if (!dc_isar_feature(aa32_fp_d32, s) && (a->vm & 0x10)) {
return false;
}
if (!vfp_access_check(s)) {
return true;
}
vm = tcg_temp_new_i64(tcg_ctx);
vd = tcg_temp_new_i32(tcg_ctx);
neon_load_reg64(s, vm, a->vm);
gen_helper_vjcvt(tcg_ctx, vd, vm, tcg_ctx->cpu_env);
neon_store_reg32(s, vd, a->vd);
tcg_temp_free_i64(tcg_ctx, vm);
tcg_temp_free_i32(tcg_ctx, vd);
return true;
}

13
qemu/target/arm/translate.c
View file

@ -3081,7 +3081,6 @@ static void gen_neon_dup_high16(DisasContext *s, TCGv_i32 var)
*/
static int disas_vfp_insn(DisasContext *s, uint32_t insn)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
uint32_t rd, rn, rm, op, delta_d, delta_m, bank_mask;
int dp, veclen;
@ -3145,7 +3144,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
return 1;
case 15:
switch (rn) {
case 0 ... 17:
case 0 ... 19:
/* Already handled by decodetree */
return 1;
default:
@ -3180,13 +3179,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
rm_is_dp = false;
break;
case 0x13: /* vjcvt */
if (!dp || !dc_isar_feature(aa32_jscvt, s)) {
return 1;
}
rd_is_dp = false;
break;
default:
return 1;
}
@ -3272,9 +3264,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
switch (op) {
case 15: /* extension space */
switch (rn) {
case 19: /* vjcvt */
gen_helper_vjcvt(tcg_ctx, s->F0s, s->F0d, tcg_ctx->cpu_env);
break;
case 20: /* fshto */
gen_vfp_shto(s, dp, 16 - rm, 0);
break;

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

@ -220,3 +220,7 @@ VCVT_int_sp ---- 1110 1.11 1000 .... 1010 s:1 1.0 .... \
vd=%vd_sp vm=%vm_sp
VCVT_int_dp ---- 1110 1.11 1000 .... 1011 s:1 1.0 .... \
vd=%vd_dp vm=%vm_sp
# VJCVT is always dp to sp
VJCVT ---- 1110 1.11 1001 .... 1011 11.0 .... \
vd=%vd_sp vm=%vm_dp