[LLVMbugs] [Bug 115] llvm-gcc fails to infer a constant expr involving static ptr is also constant

[bugzilla-daemon at zion.cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=115

sabre at nondot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED



------- Additional Comments From sabre at nondot.org  2003-11-16 14:49 -------
This bug was caused by the fix to Bug 84, so it was not present in 1.0.

The test is: test/Regression/CFrontend/2003-11-16-StaticArrayInit.c
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20031110/009563.html

Fixed like this:

$ diff -u c-common.c~ c-common.c
--- c-common.c~ Thu Nov 13 01:08:20 2003
+++ c-common.c  Sun Nov 16 14:45:22 2003
@@ -2528,7 +2528,8 @@
     intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype),
                                             TREE_UNSIGNED (sizetype)), intop);
 
-  if (EMIT_LLVM) {
+  /* Don't create an ARRAY_REF if this is a potentially a static initializer. */
+  if (EMIT_LLVM && (!TREE_CONSTANT (ptrop) || !TREE_CONSTANT(intop))) {
     /* In LLVM we really want to represent this as &P[i], not as P+i*sizeof(*P)
      */
     tree arrayref;

-Chris



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