Add attributes for AMDGPU register limits.

This is a performance hint that can be applied to kernels
to attempt to limit the number of used registers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223384 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 34 insertions, 0 deletions

diff --git a/test/SemaOpenCL/amdgpu-num-register-attrs.cl b/test/SemaOpenCL/amdgpu-num-register-attrs.cl
new file mode 100644
index 0000000000..0967700d10
--- /dev/null
+++ b/test/SemaOpenCL/amdgpu-num-register-attrs.cl
@@ -0,0 +1,34 @@
+// RUN: %clang_cc1 -triple r600-- -verify -fsyntax-only %s
+
+typedef __attribute__((amdgpu_num_vgpr(128))) struct FooStruct { // expected-error {{'amdgpu_num_vgpr' attribute only applies to kernel functions}}
+  int x;
+  float y;
+} FooStruct;
+
+
+__attribute__((amdgpu_num_vgpr("ABC"))) kernel void foo2() {} // expected-error {{'amdgpu_num_vgpr' attribute requires an integer constant}}
+__attribute__((amdgpu_num_sgpr("ABC"))) kernel void foo3() {} // expected-error {{'amdgpu_num_sgpr' attribute requires an integer constant}}
+
+
+__attribute__((amdgpu_num_vgpr(40))) void foo4() {} // expected-error {{'amdgpu_num_vgpr' attribute only applies to kernel functions}}
+__attribute__((amdgpu_num_sgpr(64))) void foo5() {} // expected-error {{'amdgpu_num_sgpr' attribute only applies to kernel functions}}
+
+__attribute__((amdgpu_num_vgpr(40))) kernel void foo7() {}
+__attribute__((amdgpu_num_sgpr(64))) kernel void foo8() {}
+__attribute__((amdgpu_num_vgpr(40), amdgpu_num_sgpr(64))) kernel void foo9() {}
+
+// Check 0 VGPR is accepted.
+__attribute__((amdgpu_num_vgpr(0))) kernel void foo10() {}
+
+// Check 0 SGPR is accepted.
+__attribute__((amdgpu_num_sgpr(0))) kernel void foo11() {}
+
+// Check both 0 SGPR and VGPR is accepted.
+__attribute__((amdgpu_num_vgpr(0), amdgpu_num_sgpr(0))) kernel void foo12() {}
+
+// Too large VGPR value.
+__attribute__((amdgpu_num_vgpr(4294967296))) kernel void foo13() {} // expected-error {{integer constant expression evaluates to value 4294967296 that cannot be represented in a 32-bit unsigned integer type}}
+
+__attribute__((amdgpu_num_sgpr(4294967296))) kernel void foo14() {} // expected-error {{integer constant expression evaluates to value 4294967296 that cannot be represented in a 32-bit unsigned integer type}}
+
+__attribute__((amdgpu_num_sgpr(4294967296), amdgpu_num_vgpr(4294967296))) kernel void foo15() {} // expected-error 2 {{integer constant expression evaluates to value 4294967296 that cannot be represented in a 32-bit unsigned integer type}}