xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2025-02-11 07:05:22 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

target/arm: Convert VFP VNMLA to decodetree

Browse Source 
Convert the VFP VNMLA instruction to decodetree.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2019-06-11 16:39:47 +01:00
parent c54a416cc6
commit 8a483533ad
3 changed files with 40 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
target/arm/translate-vfp.inc.c
View File

@ -1383,3 +1383,37 @@ static bool trans_VNMLS_dp(DisasContext *s, arg_VNMLS_sp *a)
{
return do_vfp_3op_dp(s, gen_VNMLS_dp, a->vd, a->vn, a->vm, true);
}
static void gen_VNMLA_sp(TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm, TCGv_ptr fpst)
{
/* VNMLA: -fd + -(fn * fm) */
TCGv_i32 tmp = tcg_temp_new_i32();
gen_helper_vfp_muls(tmp, vn, vm, fpst);
gen_helper_vfp_negs(tmp, tmp);
gen_helper_vfp_negs(vd, vd);
gen_helper_vfp_adds(vd, vd, tmp, fpst);
tcg_temp_free_i32(tmp);
}
static bool trans_VNMLA_sp(DisasContext *s, arg_VNMLA_sp *a)
{
return do_vfp_3op_sp(s, gen_VNMLA_sp, a->vd, a->vn, a->vm, true);
}
static void gen_VNMLA_dp(TCGv_i64 vd, TCGv_i64 vn, TCGv_i64 vm, TCGv_ptr fpst)
{
/* VNMLA: -fd + (fn * fm) */
TCGv_i64 tmp = tcg_temp_new_i64();
gen_helper_vfp_muld(tmp, vn, vm, fpst);
gen_helper_vfp_negd(tmp, tmp);
gen_helper_vfp_negd(vd, vd);
gen_helper_vfp_addd(vd, vd, tmp, fpst);
tcg_temp_free_i64(tmp);
}
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);
}

19
target/arm/translate.c
View File

@ -1393,16 +1393,6 @@ VFP_OP2(div)
#undef VFP_OP2
static inline void gen_vfp_F1_neg(int dp)
{
/* Like gen_vfp_neg() but put result in F1 */
if (dp) {
gen_helper_vfp_negd(cpu_F1d, cpu_F0d);
} else {
gen_helper_vfp_negs(cpu_F1s, cpu_F0s);
}
}
static inline void gen_vfp_abs(int dp)
{
if (dp)
@ -3122,7 +3112,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
rn = VFP_SREG_N(insn);
switch (op) {
case 0 ... 2:
case 0 ... 3:
/* Already handled by decodetree */
return 1;
default:
@ -3308,13 +3298,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
for (;;) {
/* Perform the calculation. */
switch (op) {
case 3: /* VNMLA: -fd + -(fn * fm) */
gen_vfp_mul(dp);
gen_vfp_F1_neg(dp);
gen_mov_F0_vreg(dp, rd);
gen_vfp_neg(dp);
gen_vfp_add(dp);
break;
case 4: /* mul: fn * fm */
gen_vfp_mul(dp);
break;

5
target/arm/vfp.decode
View File

@ -112,3 +112,8 @@ VNMLS_sp ---- 1110 0.01 .... .... 1010 .0.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMLS_dp ---- 1110 0.01 .... .... 1011 .0.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
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