use a 'register pressure reducing' scheduler

make sure only one move is used in a hello world

llvm-svn: 29520

2 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp b/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
index 000efaadde1..34d972ffa76 100644
--- a/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -44,6 +44,8 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
   setOperationAction(ISD::RET,           MVT::Other, Custom);
   setOperationAction(ISD::GlobalAddress, MVT::i32,   Custom);
   setOperationAction(ISD::ConstantPool,  MVT::i32,   Custom);
+
+  setSchedulingPreference(SchedulingForRegPressure);
 }
 
 namespace llvm {
diff --git a/llvm/test/Regression/CodeGen/ARM/hello.ll b/llvm/test/Regression/CodeGen/ARM/hello.ll
new file mode 100644
index 00000000000..61354a0425c
--- /dev/null
+++ b/llvm/test/Regression/CodeGen/ARM/hello.ll
@@ -0,0 +1,13 @@
+; RUN: llvm-as < %s | llc -march=arm &&
+; RUN: llvm-as < %s | llc -march=arm | grep mov | wc -l | grep 1
+%str = internal constant [12 x sbyte] c"Hello World\00"		; <[12 x sbyte]*> [#uses=1]
+
+implementation   ; Functions:
+
+int %main() {
+entry:
+	%tmp = call int %puts( sbyte* getelementptr ([12 x sbyte]* %str, int 0, uint 0) )		; <int> [#uses=0]
+	ret int 0
+}
+
+declare int %puts(sbyte*)