AMDGPU: Add implicitarg.ptr intrinsic.

Points to the start of implicit arguments (appended after explicit arguments)

Differential Revision: http://reviews.llvm.org/D20297

llvm-svn: 273317

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.kernarg.segment.ptr.ll b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.kernarg.segment.ptr.ll
index eaffe8c4699..07650d990f3 100644
--- a/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.kernarg.segment.ptr.ll
+++ b/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.kernarg.segment.ptr.ll
@@ -15,7 +15,20 @@ define void @test(i32 addrspace(1)* %out) #1 {
   ret void
 }
 
+; ALL-LABEL: {{^}}test_implicit:
+; 10 + 9 (36 prepended implicit bytes) + 2(out pointer) = 21 = 0x15
+; MESA: s_load_dword s{{[0-9]+}}, s[0:1], 0x15
+define void @test_implicit(i32 addrspace(1)* %out) #1 {
+  %implicitarg.ptr = call noalias i8 addrspace(2)* @llvm.amdgcn.implicitarg.ptr()
+  %header.ptr = bitcast i8 addrspace(2)* %implicitarg.ptr to i32 addrspace(2)*
+  %gep = getelementptr i32, i32 addrspace(2)* %header.ptr, i64 10
+  %value = load i32, i32 addrspace(2)* %gep
+  store i32 %value, i32 addrspace(1)* %out
+  ret void
+}
+
 declare i8 addrspace(2)* @llvm.amdgcn.kernarg.segment.ptr() #0
+declare i8 addrspace(2)* @llvm.amdgcn.implicitarg.ptr() #0
 
 attributes #0 = { nounwind readnone }
 attributes #1 = { nounwind }