From f651c71ff562f2ab9e3db7f178b64d4c52867a54 Mon Sep 17 00:00:00 2001
From: johanknol <johanknol@4a8a32a2-be11-0410-ad9d-d568d2c75423>
Date: Tue, 8 Apr 2003 12:51:35 +0000
Subject: [PATCH] This shows the registers in use in --i-code-in-asm and saves
 some spill locs

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@2495 4a8a32a2-be11-0410-ad9d-d568d2c75423
---
 src/SDCCicode.h    |  1 +
 src/mcs51/gen.c    | 10 +++++++++-
 src/mcs51/ralloc.c | 13 +++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/SDCCicode.h b/src/SDCCicode.h
index c11628ff..8c9ac33d 100644
--- a/src/SDCCicode.h
+++ b/src/SDCCicode.h
@@ -189,6 +189,7 @@ typedef struct iCode
     				   on stack */
     int argreg;			/* argument regno for SEND/RECEIVE */
     int eBBlockNum;             /* belongs to which eBBlock */
+    char riu;			/* after ralloc, the registers in use */
   }
 iCode;
 
diff --git a/src/mcs51/gen.c b/src/mcs51/gen.c
index 6dcefa60..9b28f9b4 100644
--- a/src/mcs51/gen.c
+++ b/src/mcs51/gen.c
@@ -8919,7 +8919,15 @@ gen51Code (iCode * lic)
 	  cln = ic->lineno;
 	}
       if (options.iCodeInAsm) {
-	emitcode("", ";ic:%d: %s", ic->key, printILine(ic));
+	char regsInUse[80];
+	int i;
+
+	for (i=0; i<8; i++) {
+	  sprintf (&regsInUse[i],
+		   "%c", ic->riu & (1<<i) ? i+'0' : '-'); 
+	}
+	regsInUse[i]=0;
+	emitcode("", "; [%s] ic:%d: %s", regsInUse, ic->seq, printILine(ic));
       }
       /* if the result is marked as
          spilt and rematerializable or code for
diff --git a/src/mcs51/ralloc.c b/src/mcs51/ralloc.c
index bf3d162f..a87aae9a 100644
--- a/src/mcs51/ralloc.c
+++ b/src/mcs51/ralloc.c
@@ -1107,6 +1107,16 @@ serialRegAssign (eBBlock ** ebbs, int count)
 
 	/* of all instructions do */
 	for (ic = ebbs[i]->sch; ic; ic = ic->next) {
+	    int i;
+
+	    // update the registers in use at the start of this icode
+	    for (i=0; i<8; i++) {
+	      if (regs8051[i].isFree) {
+		ic->riu &= ~(1<<regs8051[i].offset);
+	      } else {
+		ic->riu |= (1<<regs8051[i].offset);
+	      }
+	    }
 
 	    /* if this is an ipop that means some live
 	       range will have to be assigned again */
@@ -2790,6 +2800,7 @@ mcs51_assignRegisters (eBBlock ** ebbs, int count)
   int i;
 
   setToNull ((void *) &_G.funcrUsed);
+  setToNull ((void *) &_G.regAssigned);
   setToNull ((void *) &_G.totRegAssigned);
   mcs51_ptrRegReq = _G.stackExtend = _G.dataExtend = 0;
   mcs51_nRegs = 8;
@@ -2810,6 +2821,8 @@ mcs51_assignRegisters (eBBlock ** ebbs, int count)
   serialRegAssign (ebbs, count);
 
   freeAllRegs ();
+  setToNull ((void *) &_G.regAssigned);
+  setToNull ((void *) &_G.totRegAssigned);
   fillGaps();
 
   /* if stack was extended then tell the user */
-- 
2.30.2