[sdcc-devel] [ sdcc-Feature Requests-834198 ] e_XINIT (or: saving 10 byte)

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Feature Requests item #834198, was opened at 2003-11-01 17:08
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: None
Group: None
Status: Open
Priority: 1
Submitted By: Frieder Ferlemann (frief)
Assigned to: Nobody/Anonymous (nobody)
Summary: e_XINIT (or: saving 10 byte)

Initial Comment:
Hi, 
 
currently the end of the initialized xdata 
variables is calculated as s_XINIT+l_XINIT 
at runtime in the mcs51 startup routine. 
If the linker would generate a symbol for 
the end of XINIT area (e_XINIT) this would 
save 10 byte on each program: 
 
--- src/mcs51/main.c.orig       2003-08-08 
05:52:39.000000000 +0200 
+++ src/mcs51/main.c    2003-11-01 17:54:01.000000000 
+0100 
@@ -157,16 +157,10 @@ 
 static void _mcs51_genXINIT (FILE * of) { 
   fprintf (of, ";      _mcs51_genXINIT() start\n"); 
   fprintf (of, "       mov     a,#l_XINIT\n"); 
   fprintf (of, "       orl     a,#l_XINIT>>8\n"); 
   fprintf (of, "       jz      00003$\n"); 
-  fprintf (of, "       mov     a,#s_XINIT\n"); 
-  fprintf (of, "       add     a,#l_XINIT\n"); 
-  fprintf (of, "       mov     r1,a\n"); 
-  fprintf (of, "       mov     a,#s_XINIT>>8\n"); 
-  fprintf (of, "       addc    a,#l_XINIT>>8\n"); 
-  fprintf (of, "       mov     r2,a\n"); 
   fprintf (of, "       mov     dptr,#s_XINIT\n"); 
   fprintf (of, "       mov     r0,#s_XISEG\n"); 
   fprintf (of, "       mov     p2,#(s_XISEG >> 8)
\n"); 
   fprintf (of, "00001$:        clr     a\n"); 
   fprintf (of, "       movc    a,@a+dptr\n"); 
@@ -174,13 +168,13 @@ 
   fprintf (of, "       inc     dptr\n"); 
   fprintf (of, "       inc     r0\n"); 
   fprintf (of, "       cjne    r0,#0,00002$\n"); 
   fprintf (of, "       inc     p2\n"); 
   fprintf (of, "00002$:        mov     a,dpl\n"); 
-  fprintf (of, "       cjne    a,ar1,00001$\n"); 
+  fprintf (of, "       cjne    a,#e_XINIT,00001$
\n"); 
   fprintf (of, "       mov     a,dph\n"); 
-  fprintf (of, "       cjne    a,ar2,00001$\n"); 
+  fprintf (of, "       cjne    a,#e_XINIT>>8,00001$
\n"); 
   fprintf (of, "       mov     p2,#0xFF\n"); 
   fprintf (of, "00003$:\n"); 
   fprintf (of, ";      _mcs51_genXINIT() end\n"); 
 } 
 

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