[PATCH 19/55] target/arm: Implement MVE VNEG

From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-arm@nongnu.org, qemu-devel@nongnu.org
Cc: Richard Henderson <richard.henderson@linaro.org>
Subject: [PATCH 19/55] target/arm: Implement MVE VNEG
Date: Mon,  7 Jun 2021 17:57:45 +0100	[thread overview]
Message-ID: <20210607165821.9892-20-peter.maydell@linaro.org> (raw)
In-Reply-To: <20210607165821.9892-1-peter.maydell@linaro.org>

Implement the MVE VNEG insn (both integer and floating point forms).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-mve.h    |  6 ++++++
 target/arm/mve.decode      |  2 ++
 target/arm/mve_helper.c    | 10 ++++++++++
 target/arm/translate-mve.c | 15 +++++++++++++++
 4 files changed, 33 insertions(+)

diff --git a/target/arm/helper-mve.h b/target/arm/helper-mve.h
index 76508d5dd71..733a54d2e3c 100644
--- a/target/arm/helper-mve.h
+++ b/target/arm/helper-mve.h
@@ -55,3 +55,9 @@ DEF_HELPER_FLAGS_3(mve_vabsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vabsw, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vfabsh, TCG_CALL_NO_WG, void, env, ptr, ptr)
 DEF_HELPER_FLAGS_3(mve_vfabss, TCG_CALL_NO_WG, void, env, ptr, ptr)
+
+DEF_HELPER_FLAGS_3(mve_vnegb, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vnegh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vnegw, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vfnegh, TCG_CALL_NO_WG, void, env, ptr, ptr)
+DEF_HELPER_FLAGS_3(mve_vfnegs, TCG_CALL_NO_WG, void, env, ptr, ptr)
diff --git a/target/arm/mve.decode b/target/arm/mve.decode
index 66963dc1847..82cc0abcb82 100644
--- a/target/arm/mve.decode
+++ b/target/arm/mve.decode
@@ -80,3 +80,5 @@ VMVN             1111 1111 1 . 11 00 00 ... 0 0101 11 . 0 ... 0 @1op_nosz
 
 VABS             1111 1111 1 . 11 .. 01 ... 0 0011 01 . 0 ... 0 @1op
 VABS_fp          1111 1111 1 . 11 .. 01 ... 0 0111 01 . 0 ... 0 @1op
+VNEG             1111 1111 1 . 11 .. 01 ... 0 0011 11 . 0 ... 0 @1op
+VNEG_fp          1111 1111 1 . 11 .. 01 ... 0 0111 11 . 0 ... 0 @1op
diff --git a/target/arm/mve_helper.c b/target/arm/mve_helper.c
index 2ab05e66dfc..b14826c05a7 100644
--- a/target/arm/mve_helper.c
+++ b/target/arm/mve_helper.c
@@ -278,3 +278,13 @@ DO_1OP(vabsw, 4, int32_t, H4, DO_ABS)
 
 DO_1OP(vfabsh, 2, uint16_t, H2, DO_FABS)
 DO_1OP(vfabss, 4, uint32_t, H4, DO_FABS)
+
+#define DO_NEG(N)    (-(N))
+#define DO_FNEG(N)    ((N) ^ ~((__typeof(N))-1 >> 1))
+
+DO_1OP(vnegb, 1, int8_t, H1, DO_NEG)
+DO_1OP(vnegh, 2, int16_t, H2, DO_NEG)
+DO_1OP(vnegw, 4, int32_t, H4, DO_NEG)
+
+DO_1OP(vfnegh, 2, uint16_t, H2, DO_FNEG)
+DO_1OP(vfnegs, 4, uint32_t, H4, DO_FNEG)
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index badd4da2cbf..086cac9f0cd 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -212,6 +212,7 @@ static bool do_1op(DisasContext *s, arg_1op *a, MVEGenOneOpFn fn)
 DO_1OP(VCLZ, vclz)
 DO_1OP(VCLS, vcls)
 DO_1OP(VABS, vabs)
+DO_1OP(VNEG, vneg)
 
 static bool trans_VREV16(DisasContext *s, arg_1op *a)
 {
@@ -264,3 +265,17 @@ static bool trans_VABS_fp(DisasContext *s, arg_1op *a)
     }
     return do_1op(s, a, fns[a->size]);
 }
+
+static bool trans_VNEG_fp(DisasContext *s, arg_1op *a)
+{
+    MVEGenOneOpFn *fns[] = {
+        NULL,
+        gen_helper_mve_vfnegh,
+        gen_helper_mve_vfnegs,
+        NULL,
+    };
+    if (!dc_isar_feature(aa32_mve_fp, s)) {
+        return false;
+    }
+    return do_1op(s, a, fns[a->size]);
+}
-- 
2.20.1


