[AArch64] Add a testcase for r214957.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214965 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AArch64/AArch64TargetMachine.cpp b/lib/Target/AArch64/AArch64TargetMachine.cpp
index 2e9bb0c..561bb24 100644 (file)
--- a/lib/Target/AArch64/AArch64TargetMachine.cpp
+++ b/lib/Target/AArch64/AArch64TargetMachine.cpp
@@ -59,6 +59,12 @@ EnableAtomicTidy("aarch64-atomic-cfg-tidy", cl::Hidden,
                           " to make use of cmpxchg flow-based information"),
                  cl::init(true));
 
+static cl::opt<bool>
+EnableEarlyIfConversion("aarch64-enable-early-ifcvt", cl::Hidden,
+                        cl::desc("Run early if-conversion"),
+                        cl::init(true));
+
+
 extern "C" void LLVMInitializeAArch64Target() {
   // Register the target.
   RegisterTargetMachine<AArch64leTargetMachine> X(TheAArch64leTarget);
@@ -174,7 +180,8 @@ bool AArch64PassConfig::addInstSelector() {
 bool AArch64PassConfig::addILPOpts() {
   if (EnableCCMP)
     addPass(createAArch64ConditionalCompares());
-  addPass(&EarlyIfConverterID);
+  if (EnableEarlyIfConversion)
+    addPass(&EarlyIfConverterID);
   if (EnableStPairSuppress)
     addPass(createAArch64StorePairSuppressPass());
   return true;

diff --git a/test/CodeGen/AArch64/a57-csel.ll b/test/CodeGen/AArch64/a57-csel.ll
new file mode 100644 (file)
index 0000000..9d16d1a
--- /dev/null
+++ b/test/CodeGen/AArch64/a57-csel.ll
@@ -0,0 +1,11 @@
+; RUN: llc -mtriple=aarch64-none-linux-gnu < %s -mcpu=cortex-a57 -aarch64-enable-early-ifcvt=false | FileCheck %s
+
+; Check that the select is expanded into a branch sequence.
+define i64 @f(i64 %a, i64 %b, i64* %c, i64 %d, i64 %e) {
+  ; CHECK: cbz
+  %x0 = load i64* %c
+  %x1 = icmp eq i64 %x0, 0
+  %x2 = select i1 %x1, i64 %a, i64 %b
+  %x3 = add i64 %x2, %d
+  ret i64 %x3
+}