[PATCH] R600/SI: Add test case that crashes the coalescer with subreg liveness enabled

[Tom Stellard]

---
 test/CodeGen/R600/subreg-coalescer-crash.ll | 44 +++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 test/CodeGen/R600/subreg-coalescer-crash.ll

diff --git a/test/CodeGen/R600/subreg-coalescer-crash.ll b/test/CodeGen/R600/subreg-coalescer-crash.ll
new file mode 100644
index 0000000..8f40abd
--- /dev/null
+++ b/test/CodeGen/R600/subreg-coalescer-crash.ll
@@ -0,0 +1,44 @@
+; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs< %s | FileCheck -check-prefix=SI %s
+
+; Test that this doesn't crash the register coalescer when subreg liveness is
+; enabled.
+
+; SI: {{^}}coalescer_crash:
+
+define void @coalescer_crash() {
+entry:
+  br i1 undef, label %for.inc.1, label %do.body.preheader
+
+do.body.preheader:                                ; preds = %entry
+  %0 = insertelement <4 x i32> zeroinitializer, i32 undef, i32 1
+  br i1 undef, label %do.body56.1, label %do.body90
+
+do.body90:                                        ; preds = %do.body56.2, %do.body56.1, %do.body.preheader
+  %1 = phi <4 x i32> [ %6, %do.body56.2 ], [ %5, %do.body56.1 ], [ %0, %do.body.preheader ]
+  %2 = insertelement <4 x i32> %1, i32 undef, i32 2
+  %3 = insertelement <4 x i32> %2, i32 undef, i32 3
+  br i1 undef, label %do.body124.1, label %do.body.1562.preheader
+
+do.body.1562.preheader:                           ; preds = %do.body124.1, %do.body90
+  %storemerge = phi <4 x i32> [ %3, %do.body90 ], [ %7, %do.body124.1 ]
+  %4 = insertelement <4 x i32> undef, i32 undef, i32 1
+  br label %for.inc.1
+
+do.body56.1:                                      ; preds = %do.body.preheader
+  %5 = insertelement <4 x i32> %0, i32 undef, i32 1
+  %or.cond472.1 = or i1 undef, undef
+  br i1 %or.cond472.1, label %do.body56.2, label %do.body90
+
+do.body56.2:                                      ; preds = %do.body56.1
+  %6 = insertelement <4 x i32> %5, i32 undef, i32 1
+  br label %do.body90
+
+do.body124.1:                                     ; preds = %do.body90
+  %7 = insertelement <4 x i32> %3, i32 undef, i32 3
+  br label %do.body.1562.preheader
+
+for.inc.1:                                        ; preds = %do.body.1562.preheader, %entry
+  %storemerge591 = phi <4 x i32> [ zeroinitializer, %entry ], [ %storemerge, %do.body.1562.preheader ]
+  %add.i495 = add <4 x i32> %storemerge591, undef
+  unreachable
+}
-- 
1.8.5.5