From 85111a9c07ad2bcb91cbccf34d0653dc4687d774 Mon Sep 17 00:00:00 2001
From: Sandeep Patel <deeppatel1987@gmail.com>
Date: Tue, 15 Sep 2009 17:53:11 +0000
Subject: [PATCH] Fix superreg use in ARMAsmPrinter. Approved by Anton
 Korobeynikov.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81878 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp   |  4 +-
 .../CodeGen/ARM/2009-09-13-InvalidSuperReg.ll | 41 +++++++++++++++++++
 2 files changed, 43 insertions(+), 2 deletions(-)
 create mode 100644 test/CodeGen/ARM/2009-09-13-InvalidSuperReg.ll

diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index 7d8af17fb64..fa6720f2cde 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -318,8 +318,8 @@ void ARMAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
           << '}';
       } else if (Modifier && strcmp(Modifier, "lane") == 0) {
         unsigned RegNum = ARMRegisterInfo::getRegisterNumbering(Reg);
-        unsigned DReg = TRI->getMatchingSuperReg(Reg, RegNum & 1 ? 0 : 1,
-                                                 &ARM::DPRRegClass);
+        unsigned DReg = TRI->getMatchingSuperReg(Reg, RegNum & 1 ? 2 : 1,
+                                                 &ARM::DPR_VFP2RegClass);
         O << getRegisterName(DReg) << '[' << (RegNum & 1) << ']';
       } else {
         O << getRegisterName(Reg);
diff --git a/test/CodeGen/ARM/2009-09-13-InvalidSuperReg.ll b/test/CodeGen/ARM/2009-09-13-InvalidSuperReg.ll
new file mode 100644
index 00000000000..758b59a4638
--- /dev/null
+++ b/test/CodeGen/ARM/2009-09-13-InvalidSuperReg.ll
@@ -0,0 +1,41 @@
+; RUN: llc < %s -march=arm -mattr=+neon -mcpu=cortex-a9
+
+define arm_aapcs_vfpcc <4 x float> @foo(i8* nocapture %pBuffer, i32 %numItems) nounwind {
+  %1 = ptrtoint i8* %pBuffer to i32
+
+  %lsr.iv2641 = inttoptr i32 %1 to float*
+  %tmp29 = add i32 %1, 4
+  %tmp2930 = inttoptr i32 %tmp29 to float*
+  %tmp31 = add i32 %1, 8
+  %tmp3132 = inttoptr i32 %tmp31 to float*
+  %tmp33 = add i32 %1, 12
+  %tmp3334 = inttoptr i32 %tmp33 to float*
+  %tmp35 = add i32 %1, 16
+  %tmp3536 = inttoptr i32 %tmp35 to float*
+  %tmp37 = add i32 %1, 20
+  %tmp3738 = inttoptr i32 %tmp37 to float*
+  %tmp39 = add i32 %1, 24
+  %tmp3940 = inttoptr i32 %tmp39 to float*
+  %2 = load float* %lsr.iv2641, align 4
+  %3 = load float* %tmp2930, align 4
+  %4 = load float* %tmp3132, align 4
+  %5 = load float* %tmp3334, align 4
+  %6 = load float* %tmp3536, align 4
+  %7 = load float* %tmp3738, align 4
+  %8 = load float* %tmp3940, align 4
+  %9 = insertelement <4 x float> undef, float %6, i32 0
+  %10 = shufflevector <4 x float> %9, <4 x float> undef, <4 x i32> zeroinitializer
+  %11 = insertelement <4 x float> %10, float %7, i32 1
+  %12 = insertelement <4 x float> %11, float %8, i32 2
+  %13 = insertelement <4 x float> undef, float %2, i32 0
+  %14 = shufflevector <4 x float> %13, <4 x float> undef, <4 x i32> zeroinitializer
+  %15 = insertelement <4 x float> %14, float %3, i32 1
+  %16 = insertelement <4 x float> %15, float %4, i32 2
+  %17 = insertelement <4 x float> %16, float %5, i32 3
+  %18 = fsub <4 x float> zeroinitializer, %12
+  %19 = shufflevector <4 x float> %18, <4 x float> undef, <4 x i32> zeroinitializer
+  %20 = shufflevector <4 x float> %17, <4 x float> undef, <2 x i32> <i32 0, i32 1>
+  %21 = shufflevector <2 x float> %20, <2 x float> undef, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
+
+  ret <4 x float> %21
+}