Difference between revisions of "Code Generation/Example 3"

Revision as of 00:30, 2 May 2018

Consider the following C function:

<c> int *click(int *x, int dim) {

 int *res, i;
 for (i = dim-2, res = x+dim-1; i >= 0; i--)
   if (x[i] > *res) res = &x[i];
 return res;

} </c>

The Postfix code for the above function is as follows:

Postfix code
{{{2}}}

To compile the Postfix code directly, pf2asm can be used:

@@ Line 27: / Line 27: @@
 ;; i = dim-2
 LOCAL 12
-LOAD
+LDINT
 INT 2
 SUB
-DUP
+DUP32
 LOCAL -8
-STORE
+STINT
 TRASH 4
 ;; res = x + dim - 1
 LOCAL 8
-LOAD
+LDINT
 LOCAL 12
-LOAD
+LDINT
 INT 4
 MUL
@@ Line 47: / Line 47: @@
 MUL
 SUB
-DUP
+DUP32
 LOCAL -4
-STORE
+STINT
 TRASH 4
@@ Line 56: / Line 56: @@
 LABEL for
 LOCAL -8
-LOAD
+LDINT
 INT 0
 GE
@@ Line 65: / Line 65: @@
 ;; if test
 LOCAL 8
-LOAD ; x
+LDINT ; x
 LOCAL -8
-LOAD ; i
+LDINT; i
 INT 4
 MUL
 ADD ; x+i
-LOAD ; x[i] = *(x+i)
+LDINT ; x[i] = *(x+i)
 LOCAL -4
-LOAD ; res
+LDINT ; res
-LOAD ; *res
+LDINT ; *res
 GT
@@ Line 82: / Line 82: @@
 ;; if block
 LOCAL 8
-LOAD ; x
+LDINT ; x
 LOCAL -8
-LOAD ; i
+LDINT ; i
 INT 4
 MUL
 ADD ; x+i = &x[i]
-DUP
+DUP32
 LOCAL -4
-STORE ; res = &x[i]
+STINT ; res = &x[i]
 TRASH 4
@@ Line 100: / Line 100: @@
 LABEL forincr
 LOCAL -8
-LOAD ; i
+LDINT ; i
-DUP
+DUP32
 INT 1
 SUB
 LOCAL -8
-STORE
+STINT
 TRASH 4
@@ Line 116: / Line 116: @@
 ;; return
 LOCAL -4
-LOAD ; res
+LDINT ; res
-POP
+STFVAL32
 LEAVE
 RET