Don't handle -arm-long-calls in fast isel for now.

llvm-svn: 121919

llvm/lib/Target/ARM/ARMFastISel.cpp

@@ -52,6 +52,8 @@ DisableARMFastISel("disable-arm-fast-isel",
                     cl::desc("Turn off experimental ARM fast-isel support"),
                     cl::init(false), cl::Hidden);
 
+extern cl::opt<bool> EnableARMLongCalls;
+
 namespace {
 
   // All possible address modes, plus some.
@@ -1656,6 +1658,9 @@ bool ARMFastISel::ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call) {
   // For now we're using BLX etc on the assumption that we have v5t ops.
   if (!Subtarget->hasV5TOps()) return false;
 
+  // TODO: For now if we have long calls specified we don't handle the call.
+  if (EnableARMLongCalls) return false;
+
   // Set up the argument vectors.
   SmallVector<Value*, 8> Args;
   SmallVector<unsigned, 8> ArgRegs;
@@ -1753,6 +1758,9 @@ bool ARMFastISel::SelectCall(const Instruction *I) {
   // TODO: Maybe?
   if (!Subtarget->hasV5TOps()) return false;
 
+  // TODO: For now if we have long calls specified we don't handle the call.
+  if (EnableARMLongCalls) return false;
+  
   // Set up the argument vectors.
   SmallVector<Value*, 8> Args;
   SmallVector<unsigned, 8> ArgRegs;

llvm/lib/Target/ARM/ARMISelLowering.cpp

@@ -59,7 +59,7 @@ EnableARMTailCalls("arm-tail-calls", cl::Hidden,
   cl::desc("Generate tail calls (TEMPORARY OPTION)."),
   cl::init(false));
 
-static cl::opt<bool>
+cl::opt<bool>
 EnableARMLongCalls("arm-long-calls", cl::Hidden,
   cl::desc("Generate calls via indirect call instructions"),
   cl::init(false));

llvm/test/CodeGen/ARM/fast-isel-static.ll

@@ -0,0 +1,30 @@
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -O0 -relocation-model=static -arm-long-calls | FileCheck -check-prefix=LONG %s
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin -O0 -relocation-model=static | FileCheck -check-prefix=NORM %s
+
+define void @myadd(float* %sum, float* %addend) nounwind {
+entry:
+  %sum.addr = alloca float*, align 4
+  %addend.addr = alloca float*, align 4
+  store float* %sum, float** %sum.addr, align 4
+  store float* %addend, float** %addend.addr, align 4
+  %tmp = load float** %sum.addr, align 4
+  %tmp1 = load float* %tmp
+  %tmp2 = load float** %addend.addr, align 4
+  %tmp3 = load float* %tmp2
+  %add = fadd float %tmp1, %tmp3
+  %tmp4 = load float** %sum.addr, align 4
+  store float %add, float* %tmp4
+  ret void
+}
+
+define i32 @main(i32 %argc, i8** %argv) nounwind {
+entry:
+  %ztot = alloca float, align 4
+  %z = alloca float, align 4
+  store float 0.000000e+00, float* %ztot, align 4
+  store float 1.000000e+00, float* %z, align 4
+; CHECK-LONG: blx     r2
+; CHECK-NORM: blx     _myadd
+  call void @myadd(float* %ztot, float* %z)
+  ret i32 0
+}