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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 18/45] target/arm: Implement SME ZERO
Date: Mon, 11 Jul 2022 14:57:23 +0100
Message-Id: <20220711135750.765803-19-peter.maydell@linaro.org>
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From: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220708151540.18136-19-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
target/arm/helper-sme.h | 2 ++
target/arm/sme.decode | 4 ++++
target/arm/sme_helper.c | 25 +++++++++++++++++++++++++
target/arm/translate-sme.c | 13 +++++++++++++
4 files changed, 44 insertions(+)
diff --git a/target/arm/helper-sme.h b/target/arm/helper-sme.h
index 3bd48c235f0..c4ee1f09e46 100644
--- a/target/arm/helper-sme.h
+++ b/target/arm/helper-sme.h
@@ -19,3 +19,5 @@
=20
DEF_HELPER_FLAGS_2(set_pstate_sm, TCG_CALL_NO_RWG, void, env, i32)
DEF_HELPER_FLAGS_2(set_pstate_za, TCG_CALL_NO_RWG, void, env, i32)
+
+DEF_HELPER_FLAGS_3(sme_zero, TCG_CALL_NO_RWG, void, env, i32, i32)
diff --git a/target/arm/sme.decode b/target/arm/sme.decode
index c25c031a71d..6e4483fdcea 100644
--- a/target/arm/sme.decode
+++ b/target/arm/sme.decode
@@ -18,3 +18,7 @@
#
# This file is processed by scripts/decodetree.py
#
+
+### SME Misc
+
+ZERO 11000000 00 001 00000000000 imm:8
diff --git a/target/arm/sme_helper.c b/target/arm/sme_helper.c
index b2157255943..eef2df73e11 100644
--- a/target/arm/sme_helper.c
+++ b/target/arm/sme_helper.c
@@ -59,3 +59,28 @@ void helper_set_pstate_za(CPUARMState *env, uint32_t i)
memset(env->zarray, 0, sizeof(env->zarray));
}
}
+
+void helper_sme_zero(CPUARMState *env, uint32_t imm, uint32_t svl)
+{
+ uint32_t i;
+
+ /*
+ * Special case clearing the entire ZA space.
+ * This falls into the CONSTRAINED UNPREDICTABLE zeroing of any
+ * parts of the ZA storage outside of SVL.
+ */
+ if (imm =3D=3D 0xff) {
+ memset(env->zarray, 0, sizeof(env->zarray));
+ return;
+ }
+
+ /*
+ * Recall that ZAnH.D[m] is spread across ZA[n+8*m],
+ * so each row is discontiguous within ZA[].
+ */
+ for (i =3D 0; i < svl; i++) {
+ if (imm & (1 << (i % 8))) {
+ memset(&env->zarray[i], 0, svl);
+ }
+ }
+}
diff --git a/target/arm/translate-sme.c b/target/arm/translate-sme.c
index 786c93fb2db..971504559b3 100644
--- a/target/arm/translate-sme.c
+++ b/target/arm/translate-sme.c
@@ -33,3 +33,16 @@
*/
=20
#include "decode-sme.c.inc"
+
+
+static bool trans_ZERO(DisasContext *s, arg_ZERO *a)
+{
+ if (!dc_isar_feature(aa64_sme, s)) {
+ return false;
+ }
+ if (sme_za_enabled_check(s)) {
+ gen_helper_sme_zero(cpu_env, tcg_constant_i32(a->imm),
+ tcg_constant_i32(streaming_vec_reg_size(s)));
+ }
+ return true;
+}
--=20
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