This shows the registers in use in --i-code-in-asm and saves some spill locs

[fw/sdcc] / src / mcs51 / ralloc.c

diff --git a/src/mcs51/ralloc.c b/src/mcs51/ralloc.c
index bf3d162f02809cf0c9259391842376c255433a01..a87aae9a6eaab78e8806457a08e068c939961164 100644 (file)
--- 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 */