Difference between revisions of "Code Generation/Example 3"

Revision as of 09:29, 9 May 2017

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 15: / Line 15: @@
 The Postfix code for the above function is as follows:
+{{CollapsedCode|Postfix code|
 <asm>
 TEXT
@@ Line 26: / Line 26: @@
 ;; i = dim-2
-LOCV 12
+LOCAL 12
+LOAD
 INT 2
 SUB
 DUP
-LOCA -8
+LOCAL -8
+STORE
 TRASH 4
 ;; res = x + dim - 1
-LOCV 8
+LOCAL 8
-LOCV 12
+LOAD
+LOCAL 12
+LOAD
 INT 4
 MUL
@@ Line 44: / Line 48: @@
 SUB
 DUP
-LOCA -4
+LOCAL -4
+STORE
 TRASH 4
@@ Line 50: / Line 55: @@
 ALIGN
 LABEL for
-LOCV -8
+LOCAL -8
+LOAD
 INT 0
 GE
@@ Line 58: / Line 64: @@
 ;; if test
-LOCV 8 ; x
+LOCAL 8
-LOCV -8 ; i
+LOAD ; x
+LOCAL -8
+LOAD ; i
 INT 4
 MUL
@@ Line 65: / Line 73: @@
 LOAD ; x[i] = *(x+i)
-LOCV -4 ; res
+LOCAL -4
+LOAD ; res
 LOAD ; *res
@@ Line 72: / Line 81: @@
 ;; if block
-LOCV 8 ; x
+LOCAL 8
-LOCV -8 ; i
+LOAD ; x
+LOCAL -8
+LOAD ; i
 INT 4
 MUL
 ADD ; x+i = &x[i]
 DUP
-LOCA -4 ; res = &x[i]
+LOCAL -4
+STORE ; res = &x[i]
 TRASH 4
@@ Line 87: / Line 99: @@
 ALIGN
 LABEL forincr
-LOCV -8 ; i
+LOCAL -8
+LOAD ; i
 DUP
 INT 1
 SUB
-LOCA -8
+LOCAL -8
+STORE
 TRASH 4
@@ Line 101: / Line 115: @@
 ;; return
-LOCV -4 ; res
+LOCAL -4
+LOAD ; res
 POP
@@ Line 107: / Line 122: @@
 RET
 </asm>
+}}
 == Compiling and Running ==