[NVPTX] Add GenericToNVVM IR converter to better handle idiomatic LLVM IR inputs

This converter currently only handles global variables in address space 0. For
these variables, they are promoted to address space 1 (global memory), and all
uses are updated to point to the result of a cvta.global instruction on the new
variable.

The motivation for this is address space 0 global variables are illegal since we
cannot declare variables in the generic address space.  Instead, we place the
variables in address space 1 and explicitly convert the pointer to address
space 0. This is primarily intended to help new users who expect to be able to
place global variables in the default address space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182254 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 25 insertions, 0 deletions

diff --git a/test/CodeGen/NVPTX/generic-to-nvvm.ll b/test/CodeGen/NVPTX/generic-to-nvvm.ll
new file mode 100644
index 0000000..c9cb2f7
--- /dev/null
+++ b/test/CodeGen/NVPTX/generic-to-nvvm.ll
@@ -0,0 +1,25 @@
+; RUN: llc < %s -march=nvptx -mcpu=sm_20 -drvcuda | FileCheck %s
+
+target datalayout = "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"
+
+; Ensure global variables in address space 0 are promoted to address space 1
+
+; CHECK: .global .align 4 .u32 myglobal = 42;
+@myglobal = internal global i32 42, align 4
+; CHECK: .global .align 4 .u32 myconst = 42;
+@myconst = internal constant i32 42, align 4
+
+
+define void @foo(i32* %a, i32* %b) {
+; CHECK: cvta.global.u32
+  %ld1 = load i32* @myglobal
+; CHECK: cvta.global.u32
+  %ld2 = load i32* @myconst
+  store i32 %ld1, i32* %a
+  store i32 %ld2, i32* %b
+  ret void
+}
+
+
+!nvvm.annotations = !{!0}
+!0 = metadata !{void (i32*, i32*)* @foo, metadata !"kernel", i32 1}