PR14992 - Tablegen incorrectly converts ARM tLDMIA_UPD pseudo to tLDMIA

Fixed bug in tablegen conversion when source pseudo instruction has
a different number of arguments than the destination instruction.

llvm-svn: 175066

1 files changed, 28 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/2013-01-21-PR14992.ll b/llvm/test/CodeGen/ARM/2013-01-21-PR14992.ll
new file mode 100644
index 00000000000..38b9e0e8f08
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/2013-01-21-PR14992.ll
@@ -0,0 +1,28 @@
+;PR14492 - Tablegen incorrectly converts ARM tLDMIA_UPD pseudo to tLDMIA
+;RUN: llc -mtriple=thumbv7 < %s  | FileCheck -check-prefix=EXPECTED %s
+;RUN: llc -mtriple=thumbv7 < %s  | FileCheck %s
+
+;EXPECTED: foo:
+;CHECK: foo:
+define i32 @foo(i32* %a) nounwind optsize {
+entry:
+  %0 = load i32* %a, align 4, !tbaa !0
+  %arrayidx1 = getelementptr inbounds i32* %a, i32 1
+  %1 = load i32* %arrayidx1, align 4, !tbaa !0
+  %arrayidx2 = getelementptr inbounds i32* %a, i32 2
+  %2 = load i32* %arrayidx2, align 4, !tbaa !0
+  %add.ptr = getelementptr inbounds i32* %a, i32 3
+;Make sure we do not have a duplicated register in the front of the reg list
+;EXPECTED:  ldm [[BASE:r[0-9]+]]!, {[[REG:r[0-9]+]], {{r[0-9]+}},
+;CHECK-NOT: ldm [[BASE:r[0-9]+]]!, {[[REG:r[0-9]+]], [[REG]],
+  tail call void @bar(i32* %add.ptr) nounwind optsize
+  %add = add nsw i32 %1, %0
+  %add3 = add nsw i32 %add, %2
+  ret i32 %add3
+}
+
+declare void @bar(i32*) optsize
+
+!0 = metadata !{metadata !"int", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}