[PATCH] Use correct address space size GEP index in SROA

[Chandler Carruth]

  See below, only half of this change is necessary.


================
Comment at: lib/Transforms/Scalar/SROA.cpp:2024-2026
@@ -2018,4 +2023,5 @@
     assert(Offset >= NewAllocaBeginOffset);
-    return getAdjustedPtr(IRB, DL, &NewAI, APInt(DL.getPointerSizeInBits(),
-                                                 Offset - NewAllocaBeginOffset),
+    return getAdjustedPtr(IRB, DL, &NewAI,
+                          APInt(DL.getPointerTypeSizeInBits(PointerTy),
+                                Offset - NewAllocaBeginOffset),
                           PointerTy);
----------------
This change is unnecessary, and doesn't make any sense. The alloca pointer is always in address space zero.

================
Comment at: lib/Transforms/Scalar/SROA.cpp:2432
@@ -2423,3 +2431,3 @@
     // Compute the relative offset within the transfer.
-    unsigned IntPtrWidth = DL.getPointerSizeInBits();
+    unsigned IntPtrWidth = DL.getPointerSizeInBits(AS);
     APInt RelOffset(IntPtrWidth, NewBeginOffset - BeginOffset);
----------------
We should test this by wrapping around the end of the address space if we want to be pedantic. Maybe not necessary.


http://llvm-reviews.chandlerc.com/D1765