PTX: Default to 32-bit indexing of pointers.

Author: maleadt

src/ptx.jl

@@ -56,7 +56,7 @@ end
 
 # the default datalayout does not match the one in the NVPTX user guide
 llvm_datalayout(target::PTXCompilerTarget) = Int===Int64 ?
-    "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"*
+    "e-p:64:64:64:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"*
      "-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64" :
     "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"*
      "-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"