Add MSBIT* and LSBIT* macro's to sim-bits.h

Add more macro's for extracting sub word quantites to sim-endian.h

1 files changed, 348 insertions, 0 deletions

diff --git a/sim/common/sim-alu.h b/sim/common/sim-alu.h
new file mode 100644
index 0000000..6bb35f0
--- /dev/null
+++ b/sim/common/sim-alu.h
@@ -0,0 +1,348 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
+    Copyright (C) 1997, Free Software Foundation, Inc.
+
+    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, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+#ifndef _SIM_ALU_H_
+#define _SIM_ALU_H_
+
+#include "sim-xcat.h"
+
+/* 32bit target expressions:
+
+   Each calculation is performed three times using each of the
+   signed64, unsigned64 and long integer types.  The macro ALU_END
+   (in _ALU_RESULT_VAL) then selects which of the three alternative
+   results will be used in the final assignment of the target
+   register.  As this selection is determined at compile time by
+   fields in the instruction (OE, EA, Rc) the compiler has sufficient
+   information to firstly simplify the selection code into a single
+   case and then back anotate the equations and hence eliminate any
+   resulting dead code.  That dead code being the calculations that,
+   as it turned out were not in the end needed.
+
+   64bit arrithemetic is used firstly because it allows the use of
+   gcc's efficient long long operators (typically efficiently output
+   inline) and secondly because the resultant answer will contain in
+   the low 32bits the answer while in the high 32bits is either carry
+   or status information. */
+
+
+
+/* 16bit target expressions:
+
+   These are a simplified version of the 32bit target expressions */
+
+
+
+/* 64bit target expressions:
+
+   Unfortunatly 128bit arrithemetic isn't that common.  Consequently
+   the 32/64 bit trick can not be used.  Instead all calculations are
+   required to retain carry/overflow information in separate
+   variables.  Even with this restriction it is still possible for the
+   trick of letting the compiler discard the calculation of unneeded
+   values */
+
+
+/* Macro's to type cast 32bit constants to 64bits */
+#define SIGNED64(val)   ((signed64)(signed32)(val))
+#define UNSIGNED64(val) ((unsigned64)(unsigned32)(val))
+
+
+/* Start a section of ALU code */
+
+#define ALU16_BEGIN(VAL) \
+{ \
+  signed_word alu_carry_val; \
+  unsigned_word alu_overflow_val; \
+  ALU16_SET(VAL)
+
+#define ALU32_BEGIN(VAL) \
+{ \
+  natural_word alu_val; \
+  unsigned64 alu_carry_val; \
+  signed64 alu_overflow_val; \
+  ALU32_SET(VAL)
+
+#define ALU_BEGIN(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_BEGIN)(VAL)
+
+/* More basic alu operations */
+
+
+
+#define ALU16_SET(VAL) \
+do { \
+  alu_carry_val = (unsigned16)(VAL); \
+  alu_overflow_val = (signed16)(VAL); \
+} while (0)
+
+#define ALU32_SET(VAL) \
+do { \
+  alu_val = (unsigned32)(VAL); \
+  alu_carry_val = (unsigned32)(alu_val); \
+  alu_overflow_val = (signed32)(alu_val); \
+} while (0)
+
+#define ALU64_SET(VAL) \
+do { \
+  alu_val = (VAL); \
+  alu_carry_val = ((unsigned64)alu_val) >> 32; \
+  alu_overflow_val = ((signed64)alu_val) >> 32; \
+} while (0)
+
+#define ALU_SET(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SET)(VAL)
+
+
+
+
+#define ALU16_ADD(VAL) \
+do { \
+  alu_carry_val += (unsigned16)(VAL); \
+  alu_overflow_val += (signed16)(VAL); \
+} while (0)
+
+#define ALU32_ADD(VAL) \
+do { \
+  alu_val += (VAL); \
+  alu_carry_val += (unsigned32)(VAL); \
+  alu_overflow_val += (signed32)(VAL); \
+} while (0)
+
+#define ALU64_ADD(VAL) \
+do { \
+  unsigned64 alu_lo = (UNSIGNED64(alu_val) \
+		       + UNSIGNED64(VAL)); \
+  signed alu_carry = ((alu_lo & BIT(31)) != 0); \
+  alu_carry_val = (alu_carry_val \
+		   + UNSIGNED64(EXTRACTED(val, 0, 31)) \
+		   + alu_carry); \
+  alu_overflow_val = (alu_overflow_val \
+		      + SIGNED64(EXTRACTED(val, 0, 31)) \
+		      + alu_carry); \
+  alu_val = alu_val + val; \
+} while (0)
+
+#define ALU_ADD(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_ADD)(VAL)
+
+
+
+
+#define ALU16_ADD_CA \
+do { \
+  signed carry = ALU_CARRY; \
+  ALU16_ADD(carry); \
+} while (0)
+
+#define ALU32_ADD_CA \
+do { \
+  signed carry = ALU_CARRY; \
+  ALU32_ADD(carry); \
+} while (0)
+
+#define ALU64_ADD_CA \
+do { \
+  signed carry = ALU_CARRY; \
+  ALU64_ADD(carry); \
+} while (0)
+
+#define ALU_ADD_CA XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_ADD_CA)
+
+
+
+
+#define ALU16_SUB(VAL) \
+do { \
+  alu_carry_val -= (unsigned16)(VAL); \
+  alu_overflow_val -= (signed16)(VAL); \
+} while (0)
+
+#define ALU32_SUB(VAL) \
+do { \
+  alu_val -= (VAL); \
+  alu_carry_val -= (unsigned32)(VAL); \
+  alu_overflow_val -= (signed32)(VAL); \
+} while (0)
+
+#define ALU64_SUB(VAL) \
+do { \
+  error("ALU_SUB64"); \
+} while (0)
+
+#define ALU_SUB(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUB)(VAL)
+
+
+
+
+#define ALU16_SUB_CA \
+do { \
+  signed carry = ALU_CARRY; \
+  ALU16_SUB(carry); \
+} while (0)
+
+#define ALU32_SUB_CA \
+do { \
+  signed carry = ALU_CARRY; \
+  ALU32_SUB(carry); \
+} while (0)
+
+#define ALU64_SUB_CA \
+do { \
+  signed carry = ALU_CARRY; \
+  ALU64_SUB(carry); \
+} while (0)
+
+#define ALU_SUB_CA XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_SUB_CA)
+
+
+
+
+#define ALU16_OR(VAL) \
+do { \
+  error("ALU16_OR"); \
+} while (0)
+
+#define ALU32_OR(VAL) \
+do { \
+  alu_val |= (VAL); \
+  alu_carry_val = (unsigned32)(alu_val); \
+  alu_overflow_val = (signed32)(alu_val); \
+} while (0)
+
+#define ALU64_OR(VAL) \
+do { \
+  error("ALU_OR64"); \
+} while (0)
+
+#define ALU_OR(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_OR)(VAL)
+
+
+
+
+#define ALU16_XOR(VAL) \
+do { \
+  error("ALU16_XOR"); \
+} while (0)
+
+#define ALU32_XOR(VAL) \
+do { \
+  alu_val ^= (VAL); \
+  alu_carry_val = (unsigned32)(alu_val); \
+  alu_overflow_val = (signed32)(alu_val); \
+} while (0)
+
+#define ALU64_XOR(VAL) \
+do { \
+  error("ALU_XOR64"); \
+} while (0)
+
+#define ALU_XOR(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_XOR)(VAL)
+
+
+
+
+#define ALU16_NEGATE \
+do { \
+  error("ALU_NEGATE16"); \
+} while (0)
+
+#define ALU32_NEGATE \
+do { \
+  alu_val = -alu_val; \
+  alu_carry_val = -alu_carry_val; \
+  alu_overflow_val = -alu_overflow_val; \
+} while(0)
+
+#define ALU64_NEGATE \
+do { \
+  error("ALU_NEGATE64"); \
+} while (0)
+
+#define ALU_NEGATE XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_NEGATE)
+
+
+
+
+#define ALU16_AND(VAL) \
+do { \
+  error("ALU_AND16"); \
+} while (0)
+
+#define ALU32_AND(VAL) \
+do { \
+  alu_val &= (VAL); \
+  alu_carry_val = (unsigned32)(alu_val); \
+  alu_overflow_val = (signed32)(alu_val); \
+} while (0)
+
+#define ALU64_AND(VAL) \
+do { \
+  error("ALU_AND64"); \
+} while (0)
+
+#define ALU_AND(VAL) XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_AND)(VAL)
+
+
+
+
+#define ALU16_NOT(VAL) \
+do { \
+  error("ALU_NOT16"); \
+} while (0)
+
+#define ALU32_NOT \
+do { \
+  signed64 new_alu_val = ~alu_val; \
+  ALU_SET(new_alu_val); \
+} while (0)
+
+#define ALU64_NOT \
+do { \
+  error("ALU_NOT64"); \
+} while (0)
+
+#define ALU_NOT XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_NOT)
+
+
+
+/* Make available various results */
+
+
+/* overflow occures if the sign bit differs from the carry bit */
+
+#define ALU16_HAD_OVERFLOW \
+  (!(alu_overflow_val & MSBIT32 (0)) != !(alu_overflow_val & MSBIT32 (16)))
+  
+#define ALU32_HAD_OVERFLOW \
+  ((((unsigned64)(alu_overflow_val & BIT64(0))) >> 32) \
+   != (alu_overflow_val & MSBIT64(32)))
+
+#define ALU_HAD_OVERFLOW XCONCAT3(ALU,WITH_TARGET_WORD_BITSIZE,_HAD_OVERFLOW)
+
+/* carry found in bit before sign */
+
+#define ALU16_HAD_CARRY \
+    (alu_carry_val & MSBIT32(16))
+
+#define ALU32_HAD_CARRY \
+    (alu_carry_val & MSBIT64(31))
+
+
+#endif