1 files changed, 41 insertions, 0 deletions
diff --git a/test/CodeGen/R600/vop-shrink.ll b/test/CodeGen/R600/vop-shrink.ll
new file mode 100644
index 000000000000..54e588d80842
--- /dev/null
+++ b/test/CodeGen/R600/vop-shrink.ll
@@ -0,0 +1,41 @@
+; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI -check-prefix=FUNC %s
+; XXX: This testis for a bug in the SIShrinkInstruction pass and it will be
+;       relevant once we are selecting 64-bit instructions.  We are
+;       currently selecting mostly 32-bit instruction, so the
+;       SIShrinkInstructions pass isn't doing much.
+; XFAIL: *
+
+; Test that we correctly commute a sub instruction
+; FUNC-LABEL: @sub_rev
+; SI-NOT: V_SUB_I32_e32 v{{[0-9]+}}, s
+; SI: V_SUBREV_I32_e32 v{{[0-9]+}}, s
+
+; ModuleID = 'vop-shrink.ll'
+
+define void @sub_rev(i32 addrspace(1)* %out, <4 x i32> %sgpr, i32 %cond) {
+entry:
+  %vgpr = call i32 @llvm.r600.read.tidig.x() #1
+  %tmp = icmp eq i32 %cond, 0
+  br i1 %tmp, label %if, label %else
+
+if:                                               ; preds = %entry
+  %tmp1 = getelementptr i32 addrspace(1)* %out, i32 1
+  %tmp2 = extractelement <4 x i32> %sgpr, i32 1
+  store i32 %tmp2, i32 addrspace(1)* %out
+  br label %endif
+
+else:                                             ; preds = %entry
+  %tmp3 = extractelement <4 x i32> %sgpr, i32 2
+  %tmp4 = sub i32 %vgpr, %tmp3
+  store i32 %tmp4, i32 addrspace(1)* %out
+  br label %endif
+
+endif:                                            ; preds = %else, %if
+  ret void
+}
+
+; Function Attrs: nounwind readnone
+declare i32 @llvm.r600.read.tidig.x() #0
+
+attributes #0 = { nounwind readnone }
+attributes #1 = { readnone }