From: megacz <megacz@xwt.org>
Date: Fri, 30 Jan 2004 07:41:33 +0000 (+0000)
Subject: 2003/11/16 10:21:07
X-Git-Tag: RC3~344
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=785dcda35c460163595f2c05c0a955ce1b9f6221;p=org.ibex.core.git

2003/11/16 10:21:07

darcs-hash:20040130074133-2ba56-d8e2a6a3a87b40d5732e4d8e92b52de785e02f1e.gz
---

diff --git a/src/org/xwt/mips/Compiler.java b/src/org/xwt/mips/Compiler.java
index 80d127c..37735b1 100644
--- a/src/org/xwt/mips/Compiler.java
+++ b/src/org/xwt/mips/Compiler.java
@@ -28,15 +28,12 @@ public class Compiler implements Registers {
     // a FaultException will be throw which is easier to catch and deal with, however. as the name implies, this is slower
     private static boolean fastMem = true;
     
-    // This MUST be a power of two. If it is not horrible things will happen
+    // log_2 of the maximum bytes per method
     // NOTE: This value can be much higher without breaking the classfile 
     // specs (around 1024) but Hotstop seems to do much better with smaller
     // methods. 
-    private static int MAX_INSN_PER_METHOD = 32;
-    
-    // Don't touch this
-    private static int MAX_BYTES_PER_METHOD = MAX_INSN_PER_METHOD*4;
-    private static int METHOD_MASK = ~(MAX_BYTES_PER_METHOD-1);
+    private static int LOG_MAX_BYTES_PER_METHOD = 9;
+    private static int MAX_BYTES_PER_METHOD = 512;
     
     // Store frequently used registers in local variables
     // Unfortunately this doesn't seem to speed things up much
@@ -198,7 +195,7 @@ public class Compiler implements Registers {
         p("    private final void trampoline() throws ExecutionException {");
         p("        boolean finished = false;");
         p("        while(!finished) {");
-        p("            switch(this.pc & " + toHex(~(MAX_BYTES_PER_METHOD-1)) + ") {");
+        p("            switch(this.pc >> " + LOG_MAX_BYTES_PER_METHOD + ") {");
         p(runs.toString());
         p("                default: throw new Error(\"invalid address 0x\" + Long.toString(this.pc&0xffffffffL,16));");
         p("            }");
@@ -212,9 +209,9 @@ public class Compiler implements Registers {
     
     private static void startMethod(int addr) {
         addr &= ~(MAX_BYTES_PER_METHOD-1);
-        endOfMethod = addr + MAX_BYTES_PER_METHOD;
+        endOfMethod= addr + MAX_BYTES_PER_METHOD;
         String methodName = "run_" + Long.toString(addr & 0xffffffffL, 16);
-        runs.append(indents[4] + "case " + toHex(addr) + ": finished = !" + methodName + "(); break;\n");
+        runs.append(indents[4] + "case " + toHex(addr>>LOG_MAX_BYTES_PER_METHOD) + ": finished = !" + methodName + "(); break;\n");
         p("private final boolean " + methodName + "() throws ExecutionException { /"+"* " + toHex(addr) + " - " + toHex(endOfMethod) + " *" + "/");
         indent++;
         p("int addr, tmp;");
@@ -222,7 +219,7 @@ public class Compiler implements Registers {
             p("int " + freqRegs[i] + " = this." + freqRegs[i] + ";");
         p("for(;;) {");
         indent++;
-        p("switch(pc) {");
+        p("switch(pc>>2) {");
         indent++;
         startOfMethod = addr;
         
@@ -231,7 +228,7 @@ public class Compiler implements Registers {
     private static void endMethod(int lastAddr) {
         if(startOfMethod == 0) return;
         // This isn't strictly necessary; its just here to work around unreachable code errors
-        p("case " + toHex(lastAddr) + ":");
+        p("case " + toHex(lastAddr>>2) + ":");
         indent++;
         p("pc=" + toHex(lastAddr) + ";");
         leaveMethod();
@@ -254,7 +251,7 @@ public class Compiler implements Registers {
         if(debugCompiler)
             p("lastPC = " + toHex(pc) + ";");
         p("pc=" + toHex(target) + ";");
-        if((pc&METHOD_MASK) == (target&METHOD_MASK))
+        if((pc>>LOG_MAX_BYTES_PER_METHOD) == (target>>LOG_MAX_BYTES_PER_METHOD))
             p("continue;");
         else
             leaveMethod();
@@ -281,7 +278,7 @@ public class Compiler implements Registers {
             nextInsn = (i == count-1) ? -1 : dis.readInt();
             if(addr >= endOfMethod) { endMethod(); startMethod(addr); }
             if(jumpableAddresses==null || addr == startOfMethod || jumpableAddresses.contains(new Integer(addr))) {
-                p("case " + toHex(addr) + ":");
+                p("case " + toHex(addr>>2) + ":");
                 unreachable = false;
             } else if(unreachable) {
                 continue;