Re: [PATCH 19/19] target/arm: Split VMINMAXNM decode

2020-02-20 Thread Peter Maydell
On Fri, 14 Feb 2020 at 18:16, Richard Henderson
 wrote:
>
> Passing the raw op field from the manual is less instructive
> than it might be.  Do the full decode and use the existing
> helpers to perform the expansion.
>
> Since these are v8 insns, VECLEN+VECSTRIDE are already RES0.
>
> Signed-off-by: Richard Henderson 

Reviewed-by: Peter Maydell 

thanks
-- PMM



[PATCH 19/19] target/arm: Split VMINMAXNM decode

2020-02-14 Thread Richard Henderson
Passing the raw op field from the manual is less instructive
than it might be.  Do the full decode and use the existing
helpers to perform the expansion.

Since these are v8 insns, VECLEN+VECSTRIDE are already RES0.

Signed-off-by: Richard Henderson 
---
 target/arm/vfp-uncond.decode   |  12 ++--
 target/arm/translate-vfp.inc.c | 109 +++--
 2 files changed, 44 insertions(+), 77 deletions(-)

diff --git a/target/arm/vfp-uncond.decode b/target/arm/vfp-uncond.decode
index 5af1f2ee66..34ca164266 100644
--- a/target/arm/vfp-uncond.decode
+++ b/target/arm/vfp-uncond.decode
@@ -41,15 +41,19 @@
 %vd_dp  22:1 12:4
 %vd_sp  12:4 22:1
 
+@vfp_dnm_s    vm=%vm_sp vn=%vn_sp vd=%vd_sp
+@vfp_dnm_d    vm=%vm_dp vn=%vn_dp vd=%vd_dp
+
 VSEL 1110 0. cc:2   1010 .0.0  \
 vm=%vm_sp vn=%vn_sp vd=%vd_sp dp=0
 VSEL 1110 0. cc:2   1011 .0.0  \
 vm=%vm_dp vn=%vn_dp vd=%vd_dp dp=1
 
-VMINMAXNM    1110 1.00   1010 . op:1 .0  \
-vm=%vm_sp vn=%vn_sp vd=%vd_sp dp=0
-VMINMAXNM    1110 1.00   1011 . op:1 .0  \
-vm=%vm_dp vn=%vn_dp vd=%vd_dp dp=1
+VMAXNM_sp    1110 1.00   1010 .0.0  @vfp_dnm_s
+VMINNM_sp    1110 1.00   1010 .1.0  @vfp_dnm_s
+
+VMAXNM_dp    1110 1.00   1011 .0.0  @vfp_dnm_d
+VMINNM_dp    1110 1.00   1011 .1.0  @vfp_dnm_d
 
 VRINT    1110 1.11 10 rm:2  1010 01.0  \
 vm=%vm_sp vd=%vd_sp dp=0
diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index b5f3feaf8d..2cf85e73cf 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -322,79 +322,6 @@ static bool trans_VSEL(DisasContext *s, arg_VSEL *a)
 return true;
 }
 
-static bool trans_VMINMAXNM(DisasContext *s, arg_VMINMAXNM *a)
-{
-uint32_t rd, rn, rm;
-bool dp = a->dp;
-bool vmin = a->op;
-TCGv_ptr fpst;
-
-if (!dc_isar_feature(aa32_vminmaxnm, s)) {
-return false;
-}
-
-if (dp && !dc_isar_feature(aa32_fpdp_v2, s)) {
-return false;
-}
-
-/* UNDEF accesses to D16-D31 if they don't exist */
-if (dp && !dc_isar_feature(aa32_simd_r32, s) &&
-((a->vm | a->vn | a->vd) & 0x10)) {
-return false;
-}
-
-rd = a->vd;
-rn = a->vn;
-rm = a->vm;
-
-if (!vfp_access_check(s)) {
-return true;
-}
-
-fpst = get_fpstatus_ptr(0);
-
-if (dp) {
-TCGv_i64 frn, frm, dest;
-
-frn = tcg_temp_new_i64();
-frm = tcg_temp_new_i64();
-dest = tcg_temp_new_i64();
-
-neon_load_reg64(frn, rn);
-neon_load_reg64(frm, rm);
-if (vmin) {
-gen_helper_vfp_minnumd(dest, frn, frm, fpst);
-} else {
-gen_helper_vfp_maxnumd(dest, frn, frm, fpst);
-}
-neon_store_reg64(dest, rd);
-tcg_temp_free_i64(frn);
-tcg_temp_free_i64(frm);
-tcg_temp_free_i64(dest);
-} else {
-TCGv_i32 frn, frm, dest;
-
-frn = tcg_temp_new_i32();
-frm = tcg_temp_new_i32();
-dest = tcg_temp_new_i32();
-
-neon_load_reg32(frn, rn);
-neon_load_reg32(frm, rm);
-if (vmin) {
-gen_helper_vfp_minnums(dest, frn, frm, fpst);
-} else {
-gen_helper_vfp_maxnums(dest, frn, frm, fpst);
-}
-neon_store_reg32(dest, rd);
-tcg_temp_free_i32(frn);
-tcg_temp_free_i32(frm);
-tcg_temp_free_i32(dest);
-}
-
-tcg_temp_free_ptr(fpst);
-return true;
-}
-
 /*
  * Table for converting the most common AArch32 encoding of
  * rounding mode to arm_fprounding order (which matches the
@@ -1784,6 +1711,42 @@ static bool trans_VDIV_dp(DisasContext *s, arg_VDIV_dp 
*a)
 return do_vfp_3op_dp(s, gen_helper_vfp_divd, a->vd, a->vn, a->vm, false);
 }
 
+static bool trans_VMINNM_sp(DisasContext *s, arg_VMINNM_sp *a)
+{
+if (!dc_isar_feature(aa32_vminmaxnm, s)) {
+return false;
+}
+return do_vfp_3op_sp(s, gen_helper_vfp_minnums,
+ a->vd, a->vn, a->vm, false);
+}
+
+static bool trans_VMAXNM_sp(DisasContext *s, arg_VMAXNM_sp *a)
+{
+if (!dc_isar_feature(aa32_vminmaxnm, s)) {
+return false;
+}
+return do_vfp_3op_sp(s, gen_helper_vfp_maxnums,
+ a->vd, a->vn, a->vm, false);
+}
+
+static bool trans_VMINNM_dp(DisasContext *s, arg_VMINNM_dp *a)
+{
+if (!dc_isar_feature(aa32_vminmaxnm, s)) {
+return false;
+}
+return do_vfp_3op_dp(s, gen_helper_vfp_minnumd,
+ a->vd, a->vn, a->vm, false);
+}
+
+static bool trans_VMAXNM_dp(DisasContext *s, arg_VMAXNM_dp *a)
+{
+if (!dc_isar_feature(aa32_vminmaxnm, s)) {
+return false;
+}
+return do_vfp_3op_dp(s, gen_helper_vfp_maxnumd,
+