R600/SI: Legalize CopyToReg during instruction selection

The instruction emitter will crash if it encounters a CopyToReg
node with a non-register operand like FrameIndex.

llvm-svn: 219428

1 files changed, 26 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/R600/copy-to-reg.ll b/llvm/test/CodeGen/R600/copy-to-reg.ll
new file mode 100644
index 00000000000..f90ee782649
--- /dev/null
+++ b/llvm/test/CodeGen/R600/copy-to-reg.ll
@@ -0,0 +1,26 @@
+; RUN: llc -march=r600 -mcpu=SI -mattr=-promote-alloca -verify-machineinstrs < %s
+
+; Test that CopyToReg instructions don't have non-register operands prior
+; to being emitted.
+
+; Make sure this doesn't crash
+; CHECK-LABEL: {{^}}copy_to_reg_frameindex:
+define void @copy_to_reg_frameindex(i32 addrspace(1)* %out, i32 %a, i32 %b, i32 %c) {
+entry:
+  %alloca = alloca [16 x i32]
+  br label %loop
+
+loop:
+  %inc = phi i32 [0, %entry], [%inc.i, %loop]
+  %ptr = getelementptr [16 x i32]* %alloca, i32 0, i32 %inc
+  store i32 %inc, i32* %ptr
+  %inc.i = add i32 %inc, 1
+  %cnd = icmp uge i32 %inc.i, 16
+  br i1 %cnd, label %done, label %loop
+
+done:
+  %tmp0 = getelementptr [16 x i32]* %alloca, i32 0, i32 0
+  %tmp1 = load i32* %tmp0
+  store i32 %tmp1, i32 addrspace(1)* %out
+  ret void
+}