From 90386ad60aaf70581293138f4124a2ec47ac7eb7 Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sat, 7 Jun 2014 20:29:27 +0000
Subject: [PATCH] ARM: correct assertion for long-calls on WoA

COFF/PE, so the relocation model is never static.  Loosen the assertion
accordingly.  The relocation can still be emitted properly, as it will be
converted to an IMAGE_REL_ARM_ADDR32 which will be resolved by the loader
taking the base relocation into account.  This is necessary to permit the
emission of long calls which can be controlled via the -mlong-calls option in
the driver.

llvm-svn: 210399
---
 llvm/lib/Target/ARM/ARMISelLowering.cpp     |  5 +++--
 llvm/test/CodeGen/ARM/Windows/long-calls.ll | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)
 create mode 100644 llvm/test/CodeGen/ARM/Windows/long-calls.ll

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.cpp b/llvm/lib/Target/ARM/ARMISelLowering.cpp
index eed523be3f32..dbcd42343174 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -1598,8 +1598,9 @@ ARMTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
   ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
 
   if (EnableARMLongCalls) {
-    assert (getTargetMachine().getRelocationModel() == Reloc::Static
-            && "long-calls with non-static relocation model!");
+    assert((Subtarget->isTargetWindows() ||
+            getTargetMachine().getRelocationModel() == Reloc::Static) &&
+           "long-calls with non-static relocation model!");
     // Handle a global address or an external symbol. If it's not one of
     // those, the target's already in a register, so we don't need to do
     // anything extra.
diff --git a/llvm/test/CodeGen/ARM/Windows/long-calls.ll b/llvm/test/CodeGen/ARM/Windows/long-calls.ll
new file mode 100644
index 000000000000..e35f414579af
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/Windows/long-calls.ll
@@ -0,0 +1,18 @@
+; RUN: llc -mtriple=thumbv7-windows -mcpu=cortex-a9 -arm-long-calls -o - %s \
+; RUN:    | FileCheck %s
+
+declare arm_aapcs_vfpcc void @callee()
+
+define arm_aapcs_vfpcc void @caller() nounwind {
+entry:
+  tail call void @callee()
+  ret void
+}
+
+; CHECK-LABEL: caller
+; CHECK: ldr [[REG:r[0-9]+]], [[CPI:.LCPI[_0-9]+]]
+; CHECK: bx [[REG]]
+; CHECK: .align 2
+; CHECK: [[CPI]]:
+; CHECK: .long callee
+