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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 28/45] target/arm: Implement PSEL
Date: Mon, 11 Jul 2022 14:57:33 +0100
Message-Id: <20220711135750.765803-29-peter.maydell@linaro.org>
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From: Richard Henderson <richard.henderson@linaro.org>
This is an SVE instruction that operates using the SVE vector
length but that it is present only if SME is implemented.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-29-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target/arm/sve.decode | 20 +++++++++++++
target/arm/translate-sve.c | 57 ++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
diff --git a/target/arm/sve.decode b/target/arm/sve.decode
index 95af08c139f..966803cbb78 100644
--- a/target/arm/sve.decode
+++ b/target/arm/sve.decode
@@ -1674,3 +1674,23 @@ BFMLALT_zzxw 01100100 11 1 ..... 0100.1 ..... ...=
.. @rrxr_3a esz=3D2
=20
### SVE2 floating-point bfloat16 dot-product (indexed)
BFDOT_zzxz 01100100 01 1 ..... 010000 ..... ..... @rrxr_2 esz=3D2
+
+### SVE broadcast predicate element
+
+&psel esz pd pn pm rv imm
+%psel_rv 16:2 !function=3Dplus_12
+%psel_imm_b 22:2 19:2
+%psel_imm_h 22:2 20:1
+%psel_imm_s 22:2
+%psel_imm_d 23:1
+@psel ........ .. . ... .. .. pn:4 . pm:4 . pd:4 \
+ &psel rv=3D%psel_rv
+
+PSEL 00100101 .. 1 ..1 .. 01 .... 0 .... 0 .... \
+ @psel esz=3D0 imm=3D%psel_imm_b
+PSEL 00100101 .. 1 .10 .. 01 .... 0 .... 0 .... \
+ @psel esz=3D1 imm=3D%psel_imm_h
+PSEL 00100101 .. 1 100 .. 01 .... 0 .... 0 .... \
+ @psel esz=3D2 imm=3D%psel_imm_s
+PSEL 00100101 .1 1 000 .. 01 .... 0 .... 0 .... \
+ @psel esz=3D3 imm=3D%psel_imm_d
diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index fd1a1736374..24ffb69a2af 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -7419,3 +7419,60 @@ static bool do_BFMLAL_zzxw(DisasContext *s, arg_rrxr=
_esz *a, bool sel)
=20
TRANS_FEAT(BFMLALB_zzxw, aa64_sve_bf16, do_BFMLAL_zzxw, a, false)
TRANS_FEAT(BFMLALT_zzxw, aa64_sve_bf16, do_BFMLAL_zzxw, a, true)
+
+static bool trans_PSEL(DisasContext *s, arg_psel *a)
+{
+ int vl =3D vec_full_reg_size(s);
+ int pl =3D pred_gvec_reg_size(s);
+ int elements =3D vl >> a->esz;
+ TCGv_i64 tmp, didx, dbit;
+ TCGv_ptr ptr;
+
+ if (!dc_isar_feature(aa64_sme, s)) {
+ return false;
+ }
+ if (!sve_access_check(s)) {
+ return true;
+ }
+
+ tmp =3D tcg_temp_new_i64();
+ dbit =3D tcg_temp_new_i64();
+ didx =3D tcg_temp_new_i64();
+ ptr =3D tcg_temp_new_ptr();
+
+ /* Compute the predicate element. */
+ tcg_gen_addi_i64(tmp, cpu_reg(s, a->rv), a->imm);
+ if (is_power_of_2(elements)) {
+ tcg_gen_andi_i64(tmp, tmp, elements - 1);
+ } else {
+ tcg_gen_remu_i64(tmp, tmp, tcg_constant_i64(elements));
+ }
+
+ /* Extract the predicate byte and bit indices. */
+ tcg_gen_shli_i64(tmp, tmp, a->esz);
+ tcg_gen_andi_i64(dbit, tmp, 7);
+ tcg_gen_shri_i64(didx, tmp, 3);
+ if (HOST_BIG_ENDIAN) {
+ tcg_gen_xori_i64(didx, didx, 7);
+ }
+
+ /* Load the predicate word. */
+ tcg_gen_trunc_i64_ptr(ptr, didx);
+ tcg_gen_add_ptr(ptr, ptr, cpu_env);
+ tcg_gen_ld8u_i64(tmp, ptr, pred_full_reg_offset(s, a->pm));
+
+ /* Extract the predicate bit and replicate to MO_64. */
+ tcg_gen_shr_i64(tmp, tmp, dbit);
+ tcg_gen_andi_i64(tmp, tmp, 1);
+ tcg_gen_neg_i64(tmp, tmp);
+
+ /* Apply to either copy the source, or write zeros. */
+ tcg_gen_gvec_ands(MO_64, pred_full_reg_offset(s, a->pd),
+ pred_full_reg_offset(s, a->pn), tmp, pl, pl);
+
+ tcg_temp_free_i64(tmp);
+ tcg_temp_free_i64(dbit);
+ tcg_temp_free_i64(didx);
+ tcg_temp_free_ptr(ptr);
+ return true;
+}
--=20
2.25.1