Implememting named register intrinsics
This patch implements the infrastructure to use named register constructs in
programs that need access to specific registers (bare metal, kernels, etc).
So far, only the stack pointer is supported as a technology preview, but as it
is, the intrinsic can already support all non-allocatable registers from any
architecture.
llvm-svn: 208104
diff --git a/llvm/test/CodeGen/ARM/named-reg-alloc.ll b/llvm/test/CodeGen/ARM/named-reg-alloc.ll
new file mode 100644
index 0000000..3c27d22
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/named-reg-alloc.ll
@@ -0,0 +1,14 @@
+; RUN: not llc < %s -mtriple=arm-apple-darwin 2>&1 | FileCheck %s
+; RUN: not llc < %s -mtriple=arm-linux-gnueabi 2>&1 | FileCheck %s
+
+define i32 @get_stack() nounwind {
+entry:
+; FIXME: Include an allocatable-specific error message
+; CHECK: Invalid register name global variable
+ %sp = call i32 @llvm.read_register.i32(metadata !0)
+ ret i32 %sp
+}
+
+declare i32 @llvm.read_register.i32(metadata) nounwind
+
+!0 = metadata !{metadata !"r5\00"}