R600/SI: Add failing testcase.

This is broken when 64-bit add is only partially
moved to the VALU.

llvm-svn: 216933

1 files changed, 43 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/R600/split-scalar-i64-add.ll b/llvm/test/CodeGen/R600/split-scalar-i64-add.ll
new file mode 100644
index 00000000000..cc50f89eaa7
--- /dev/null
+++ b/llvm/test/CodeGen/R600/split-scalar-i64-add.ll
@@ -0,0 +1,43 @@
+; XFAIL:*
+; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
+
+declare i32 @llvm.r600.read.tidig.x() readnone
+
+; This is broken because the low half of the 64-bit add remains on the
+; SALU, but the upper half does not. The addc expects the carry bit
+; set in vcc, which is undefined since the low scalar half add sets
+; scc instead.
+
+; FUNC-LABEL: @imp_def_vcc_split_i64_add_0
+define void @imp_def_vcc_split_i64_add_0(i64 addrspace(1)* %out, i32 %val) {
+  %vec.0 = insertelement <2 x i32> undef, i32 %val, i32 0
+  %vec.1 = insertelement <2 x i32> %vec.0, i32 999999, i32 1
+  %bc = bitcast <2 x i32> %vec.1 to i64
+  %add = add i64 %bc, 399
+  store i64 %add, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; FUNC-LABEL: @imp_def_vcc_split_i64_add_1
+define void @imp_def_vcc_split_i64_add_1(i64 addrspace(1)* %out, i32 %val0, i64 %val1) {
+  %vec.0 = insertelement <2 x i32> undef, i32 %val0, i32 0
+  %vec.1 = insertelement <2 x i32> %vec.0, i32 99999, i32 1
+  %bc = bitcast <2 x i32> %vec.1 to i64
+  %add = add i64 %bc, %val1
+  store i64 %add, i64 addrspace(1)* %out, align 8
+  ret void
+}
+
+; Doesn't use constants
+; FUNC-LABEL @imp_def_vcc_split_i64_add_2
+define void @imp_def_vcc_split_i64_add_2(i64 addrspace(1)* %out, i32 addrspace(1)* %in, i32 %val0, i64 %val1) {
+  %tid = call i32 @llvm.r600.read.tidig.x() readnone
+  %gep = getelementptr i32 addrspace(1)* %in, i32 %tid
+  %load = load i32 addrspace(1)* %gep
+  %vec.0 = insertelement <2 x i32> undef, i32 %val0, i32 0
+  %vec.1 = insertelement <2 x i32> %vec.0, i32 %load, i32 1
+  %bc = bitcast <2 x i32> %vec.1 to i64
+  %add = add i64 %bc, %val1
+  store i64 %add, i64 addrspace(1)* %out, align 8
+  ret void
+}