[PowerPC] Add global named register support
Support for the intrinsics that read from and write to global named registers
is added for r1, r2 and r13 (depending on the subtarget).
llvm-svn: 208509
diff --git a/llvm/test/CodeGen/PowerPC/named-reg-alloc-r13.ll b/llvm/test/CodeGen/PowerPC/named-reg-alloc-r13.ll
new file mode 100644
index 0000000..900ebb2
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/named-reg-alloc-r13.ll
@@ -0,0 +1,18 @@
+; RUN: not llc < %s -mtriple=powerpc-apple-darwin 2>&1 | FileCheck %s --check-prefix=CHECK-DARWIN
+; RUN: llc < %s -mtriple=powerpc-unknown-linux-gnu 2>&1 | FileCheck %s
+; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu 2>&1 | FileCheck %s
+
+define i32 @get_reg() nounwind {
+entry:
+; FIXME: Include an allocatable-specific error message
+; CHECK-DARWIN: Invalid register name global variable
+ %reg = call i32 @llvm.read_register.i32(metadata !0)
+ ret i32 %reg
+
+; CHECK-LABEL: @get_reg
+; CHECK: mr 3, 13
+}
+
+declare i32 @llvm.read_register.i32(metadata) nounwind
+
+!0 = metadata !{metadata !"r13\00"}