[RFC PATCH v2 33/67] Hexagon instruction classes

[Taylor Simpson <tsimpson@quicinc.com>]

Used to determine legal VLIW slots for each instruction

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
---
 target/hexagon/iclass.h |  46 +++++++++++++++++++++
 target/hexagon/iclass.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 153 insertions(+)
 create mode 100644 target/hexagon/iclass.h
 create mode 100644 target/hexagon/iclass.c

diff --git a/target/hexagon/iclass.h b/target/hexagon/iclass.h
new file mode 100644
index 0000000..89288ac
--- /dev/null
+++ b/target/hexagon/iclass.h
@@ -0,0 +1,46 @@
+/*
+ *  Copyright(c) 2019-2020 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HEXAGON_ICLASS_H
+#define HEXAGON_ICLASS_H
+
+#include "opcodes.h"
+
+#define ICLASS_FROM_TYPE(TYPE) ICLASS_##TYPE
+
+typedef enum {
+
+#define DEF_PP_ICLASS32(TYPE, SLOTS, UNITS)    ICLASS_FROM_TYPE(TYPE),
+#define DEF_EE_ICLASS32(TYPE, SLOTS, UNITS)    /* nothing */
+#include "imported/iclass.def"
+#undef DEF_PP_ICLASS32
+#undef DEF_EE_ICLASS32
+
+#define DEF_EE_ICLASS32(TYPE, SLOTS, UNITS)    ICLASS_FROM_TYPE(TYPE),
+#define DEF_PP_ICLASS32(TYPE, SLOTS, UNITS)    /* nothing */
+#include "imported/iclass.def"
+#undef DEF_PP_ICLASS32
+#undef DEF_EE_ICLASS32
+
+    ICLASS_FROM_TYPE(COPROC_VX),
+    ICLASS_FROM_TYPE(COPROC_VMEM),
+    NUM_ICLASSES
+} iclass_t;
+
+extern const char *find_iclass_slots(opcode_t opcode, int itype);
+
+#endif
diff --git a/target/hexagon/iclass.c b/target/hexagon/iclass.c
new file mode 100644
index 0000000..9ada8cd
--- /dev/null
+++ b/target/hexagon/iclass.c
@@ -0,0 +1,107 @@
+/*
+ *  Copyright(c) 2019-2020 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "iclass.h"
+
+typedef struct {
+    const char * const slots;
+} iclass_info_t;
+
+static const iclass_info_t iclass_info[] = {
+
+#define DEF_EE_ICLASS32(TYPE, SLOTS, UNITS)    /* nothing */
+#define DEF_PP_ICLASS32(TYPE, SLOTS, UNITS) \
+    [ICLASS_FROM_TYPE(TYPE)] = { .slots = #SLOTS },
+
+#include "imported/iclass.def"
+#undef DEF_PP_ICLASS32
+#undef DEF_EE_ICLASS32
+
+#define DEF_PP_ICLASS32(TYPE, SLOTS, UNITS)    /* nothing */
+#define DEF_EE_ICLASS32(TYPE, SLOTS, UNITS) \
+    [ICLASS_FROM_TYPE(TYPE)] = { .slots = #SLOTS },
+
+#include "imported/iclass.def"
+#undef DEF_PP_ICLASS32
+#undef DEF_EE_ICLASS32
+
+    {0}
+};
+
+const char *find_iclass_slots(opcode_t opcode, int itype)
+{
+    /* There are some exceptions to what the iclass dictates */
+    if (GET_ATTRIB(opcode, A_ICOP)) {
+        return "2";
+    } else if (GET_ATTRIB(opcode, A_RESTRICT_SLOT0ONLY)) {
+        return "0";
+    } else if (GET_ATTRIB(opcode, A_RESTRICT_SLOT1ONLY)) {
+        return "1";
+    } else if (GET_ATTRIB(opcode, A_RESTRICT_SLOT2ONLY)) {
+        return "2";
+    } else if (GET_ATTRIB(opcode, A_RESTRICT_SLOT3ONLY)) {
+        return "3";
+    } else if (GET_ATTRIB(opcode, A_COF) &&
+               GET_ATTRIB(opcode, A_INDIRECT) &&
+               !GET_ATTRIB(opcode, A_MEMLIKE) &&
+               !GET_ATTRIB(opcode, A_MEMLIKE_PACKET_RULES)) {
+        return "2";
+    } else if (GET_ATTRIB(opcode, A_RESTRICT_NOSLOT1)) {
+        return "0";
+    } else if ((opcode == J2_trap0) || (opcode == J2_trap1) ||
+               (opcode == Y2_isync) || (opcode == J2_rte) ||
+               (opcode == J2_pause) || (opcode == J4_hintjumpr)) {
+        return "2";
+    } else if ((itype == ICLASS_V2LDST) && (GET_ATTRIB(opcode, A_STORE))) {
+        return "01";
+    } else if ((itype == ICLASS_V2LDST) && (!GET_ATTRIB(opcode, A_STORE))) {
+        return "01";
+    } else if (GET_ATTRIB(opcode, A_CRSLOT23)) {
+        return "23";
+    } else if (GET_ATTRIB(opcode, A_RESTRICT_PREFERSLOT0)) {
+        return "0";
+    } else if (GET_ATTRIB(opcode, A_SUBINSN)) {
+        return "01";
+    } else if (GET_ATTRIB(opcode, A_CALL)) {
+        return "23";
+    } else if ((opcode == J4_jumpseti) || (opcode == J4_jumpsetr)) {
+        return "23";
+    } else if (GET_ATTRIB(opcode, A_EXTENSION) && GET_ATTRIB(opcode, A_CVI)) {
+        /* CVI EXTENSIONS */
+        if (GET_ATTRIB(opcode, A_CVI_VM)) {
+            return "01";
+        } else if (GET_ATTRIB(opcode, A_RESTRICT_SLOT2ONLY)) {
+            return "2";
+        } else if (GET_ATTRIB(opcode, A_CVI_SLOT23)) {
+            return "23";
+        } else if (GET_ATTRIB(opcode, A_CVI_VX)) {
+            return "23";
+        } else if (GET_ATTRIB(opcode, A_CVI_VX_DV)) {
+            return "23";
+        } else if (GET_ATTRIB(opcode, A_CVI_VS_VX)) {
+            return "23";
+        } else if (GET_ATTRIB(opcode, A_MEMLIKE)) {
+            return "01";
+        } else {
+            return "0123";
+        }
+    } else {
+        return iclass_info[itype].slots;
+    }
+}
+
-- 
2.7.4