dattalo Added pcodeflow.h - most of the flow definitions are now here.

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@1995 4a8a32a2-be11-0410-ad9d-d568d2c75423

diff --git a/src/pic/pcodeflow.h b/src/pic/pcodeflow.h
new file mode 100644 (file)
index 0000000..6db2382
--- /dev/null
+++ b/src/pic/pcodeflow.h
@@ -0,0 +1,62 @@
+/*-------------------------------------------------------------------------
+
+   pcode.h - post code generation
+   Written By -  Scott Dattalo scott@dattalo.com
+
+   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, 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+   
+-------------------------------------------------------------------------*/
+
+#ifndef __PCODE_FLOW_H__
+#define __PCODE_FLOW_H__
+
+/*************************************************
+ * pCode conditions:
+ *
+ * The "conditions" are bit-mapped flags that describe
+ * input and/or output conditions that are affected by
+ * the instructions. For example:
+ *
+ *    MOVF   SOME_REG,W
+ *
+ * This instruction depends upon 'SOME_REG'. Consequently
+ * it has the input condition PCC_REGISTER set to true.
+ *
+ * In addition, this instruction affects the Z bit in the
+ * status register and affects W. Thus the output conditions
+ * are the logical or:
+ *  PCC_ZERO_BIT | PCC_W
+ *
+ * The conditions are intialized when the pCode for an
+ * instruction is created. They're subsequently used
+ * by the pCode optimizer determine state information
+ * in the program flow.
+ *************************************************/
+
+#define  PCC_NONE          0
+#define  PCC_REGISTER      (1<<0)
+#define  PCC_C             (1<<1)
+#define  PCC_Z             (1<<2)
+#define  PCC_DC            (1<<3)
+#define  PCC_W             (1<<4)
+#define  PCC_EXAMINE_PCOP  (1<<5)
+#define  PCC_REG_BANK0     (1<<6)
+#define  PCC_REG_BANK1     (1<<7)
+#define  PCC_REG_BANK2     (1<<8)
+#define  PCC_REG_BANK3     (1<<9)
+
+/*------------------------------------------------------------*/
+
+#endif // __PCODE_H__