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target/arm: Convert VFP VMLS to decodetree 

Convert the VFP VMLS 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 16:39:46 +01:00
parent 266bd25c48
commit e7258280d4
3 changed files with 44 additions and 7 deletions
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38
target/arm/translate-vfp.inc.c
View File

@ -1303,3 +1303,41 @@ static bool trans_VMLA_dp(DisasContext *s, arg_VMLA_sp *a)
{
return do_vfp_3op_dp(s, gen_VMLA_dp, a->vd, a->vn, a->vm, true);
}
static void gen_VMLS_sp(TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm, TCGv_ptr fpst)
{
/*
* VMLS: vd = vd + -(vn * vm)
* Note that order of inputs to the add matters for NaNs.
*/
TCGv_i32 tmp = tcg_temp_new_i32();
gen_helper_vfp_muls(tmp, vn, vm, fpst);
gen_helper_vfp_negs(tmp, tmp);
gen_helper_vfp_adds(vd, vd, tmp, fpst);
tcg_temp_free_i32(tmp);
}
static bool trans_VMLS_sp(DisasContext *s, arg_VMLS_sp *a)
{
return do_vfp_3op_sp(s, gen_VMLS_sp, a->vd, a->vn, a->vm, true);
}
static void gen_VMLS_dp(TCGv_i64 vd, TCGv_i64 vn, TCGv_i64 vm, TCGv_ptr fpst)
{
/*
* VMLS: vd = vd + -(vn * vm)
* Note that order of inputs to the add matters for NaNs.
*/
TCGv_i64 tmp = tcg_temp_new_i64();
gen_helper_vfp_muld(tmp, vn, vm, fpst);
gen_helper_vfp_negd(tmp, tmp);
gen_helper_vfp_addd(vd, vd, tmp, fpst);
tcg_temp_free_i64(tmp);
}
static bool trans_VMLS_dp(DisasContext *s, arg_VMLS_sp *a)
{
return do_vfp_3op_dp(s, gen_VMLS_dp, a->vd, a->vn, a->vm, true);
}

8
target/arm/translate.c
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@ -3134,7 +3134,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
rn = VFP_SREG_N(insn);
switch (op) {
case 0:
case 0 ... 1:
/* Already handled by decodetree */
return 1;
default:
@ -3320,12 +3320,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t insn)
for (;;) {
/* Perform the calculation. */
switch (op) {
case 1: /* VMLS: fd + -(fn * fm) */
gen_vfp_mul(dp);
gen_vfp_F1_neg(dp);
gen_mov_F0_vreg(dp, rd);
gen_vfp_add(dp);
break;
case 2: /* VNMLS: -fd + (fn * fm) */
/* Note that it isn't valid to replace (-A + B) with (B - A)
* or similar plausible looking simplifications

5
target/arm/vfp.decode
View File

@ -102,3 +102,8 @@ VMLA_sp ---- 1110 0.00 .... .... 1010 .0.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VMLA_dp ---- 1110 0.00 .... .... 1011 .0.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp
VMLS_sp ---- 1110 0.00 .... .... 1010 .1.0 .... \
vm=%vm_sp vn=%vn_sp vd=%vd_sp
VMLS_dp ---- 1110 0.00 .... .... 1011 .1.0 .... \
vm=%vm_dp vn=%vn_dp vd=%vd_dp