From fa1be5d99153a4709740ce5aabba3793e9f77982 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 29 Sep 2009 07:07:30 +0000
Subject: [PATCH] Fix PR4687. Pre ARMv5te does not support ldrd / strd. Patch
 by John Tytgat.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83058 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMLoadStoreOptimizer.cpp   |  4 ++++
 test/CodeGen/ARM/2009-09-28-LdStOptiBug.ll | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 test/CodeGen/ARM/2009-09-28-LdStOptiBug.ll

diff --git a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
index f1a6c642b86..031f5b0da4c 100644
--- a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
+++ b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
@@ -1191,6 +1191,10 @@ ARMPreAllocLoadStoreOpt::CanFormLdStDWord(MachineInstr *Op0, MachineInstr *Op1,
                                           unsigned &PredReg,
                                           ARMCC::CondCodes &Pred,
                                           bool &isT2) {
+  // Make sure we're allowed to generate LDRD/STRD.
+  if (!STI->hasV5TEOps())
+    return false;
+
   // FIXME: FLDS / FSTS -> FLDD / FSTD
   unsigned Scale = 1;
   unsigned Opcode = Op0->getOpcode();
diff --git a/test/CodeGen/ARM/2009-09-28-LdStOptiBug.ll b/test/CodeGen/ARM/2009-09-28-LdStOptiBug.ll
new file mode 100644
index 00000000000..53bd6682595
--- /dev/null
+++ b/test/CodeGen/ARM/2009-09-28-LdStOptiBug.ll
@@ -0,0 +1,19 @@
+; RUN: llc < %s -mtriple=armv5-unknown-linux-gnueabi -mcpu=arm10tdmi | FileCheck %s
+; PR4687
+
+%0 = type { double, double }
+
+define arm_aapcscc void @foo(%0* noalias nocapture sret %agg.result, double %x.0, double %y.0) nounwind {
+; CHECK: foo:
+; CHECK: bl __adddf3
+; CHECK-NOT: strd
+; CHECK: mov
+  %x76 = fmul double %y.0, 0.000000e+00           ; <double> [#uses=1]
+  %x77 = fadd double %y.0, 0.000000e+00           ; <double> [#uses=1]
+  %tmpr = fadd double %x.0, %x76                  ; <double> [#uses=1]
+  %agg.result.0 = getelementptr %0* %agg.result, i32 0, i32 0 ; <double*> [#uses=1]
+  store double %tmpr, double* %agg.result.0, align 8
+  %agg.result.1 = getelementptr %0* %agg.result, i32 0, i32 1 ; <double*> [#uses=1]
+  store double %x77, double* %agg.result.1, align 8
+  ret void
+}