[Qemu-devel] [PATCH 08/16 v1] target-tilegx: Add several helpers for instructions translation

[Chen Gang <xili_gchen_5257@hotmail.com>]

The related instructions are exception, cntlz, cnttz, shufflebytes, and
add_saturate.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
---
 target-tilegx/helper.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
 target-tilegx/helper.h |  5 +++
 2 files changed, 88 insertions(+)
 create mode 100644 target-tilegx/helper.c
 create mode 100644 target-tilegx/helper.h

diff --git a/target-tilegx/helper.c b/target-tilegx/helper.c
new file mode 100644
index 0000000..5ab41cd
--- /dev/null
+++ b/target-tilegx/helper.c
@@ -0,0 +1,83 @@
+/*
+ * QEMU TILE-Gx helpers
+ *
+ *  Copyright (c) 2015 Chen Gang
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see
+ * <http://www.gnu.org/licenses/lgpl-2.1.html>
+ */
+
+#include "cpu.h"
+#include "qemu-common.h"
+#include "exec/helper-proto.h"
+
+#define SIGNBIT32 0x80000000
+
+int64_t helper_add_saturate(CPUTLGState *env, uint64_t rsrc, uint64_t rsrcb)
+{
+    uint32_t rdst = rsrc + rsrcb;
+
+    if (((rdst ^ rsrc) & SIGNBIT32) && !((rsrc ^ rsrcb) & SIGNBIT32)) {
+        rdst = ~(((int32_t)rsrc >> 31) ^ SIGNBIT32);
+    }
+
+    return (int64_t)rdst;
+}
+
+void helper_exception(CPUTLGState *env, uint32_t excp)
+{
+    CPUState *cs = CPU(tilegx_env_get_cpu(env));
+
+    cs->exception_index = excp;
+    cpu_loop_exit(cs);
+}
+
+uint64_t helper_cntlz(uint64_t arg)
+{
+    return clz64(arg);
+}
+
+uint64_t helper_cnttz(uint64_t arg)
+{
+    return ctz64(arg);
+}
+
+/*
+ * Functional Description
+ *     uint64_t a = rf[SrcA];
+ *     uint64_t b = rf[SrcB];
+ *     uint64_t d = rf[Dest];
+ *     uint64_t output = 0;
+ *     unsigned int counter;
+ *     for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
+ *     {
+ *         int sel = getByte (b, counter) & 0xf;
+ *         uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
+ *         output = setByte (output, counter, byte);
+ *     }
+ *     rf[Dest] = output;
+ */
+uint64_t helper_shufflebytes(uint64_t rdst, uint64_t rsrc, uint64_t rsrcb)
+{
+    uint64_t vdst = 0;
+    int count;
+
+    for (count = 0; count < 64; count += 8) {
+        uint64_t sel = rsrcb >> count;
+        uint64_t src = (sel & 8) ? rsrc : rdst;
+        vdst |= ((src >> ((sel & 7) * 8)) & 0xff) << count;
+    }
+
+    return vdst;
+}
diff --git a/target-tilegx/helper.h b/target-tilegx/helper.h
new file mode 100644
index 0000000..1411c19
--- /dev/null
+++ b/target-tilegx/helper.h
@@ -0,0 +1,5 @@
+DEF_HELPER_2(exception, noreturn, env, i32)
+DEF_HELPER_FLAGS_1(cntlz, TCG_CALL_NO_RWG_SE, i64, i64)
+DEF_HELPER_FLAGS_1(cnttz, TCG_CALL_NO_RWG_SE, i64, i64)
+DEF_HELPER_FLAGS_3(shufflebytes, TCG_CALL_NO_RWG_SE, i64, i64, i64, i64)
+DEF_HELPER_3(add_saturate, s64, env, i64, i64)
-- 
1.9.3