Use movt/movw pair to materialize 32 bit constants on ARMv6T2+.
This should be better than single load from constpool.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82948 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index a37c7c5..d165a09 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -934,19 +934,21 @@
case ISD::Constant: {
unsigned Val = cast<ConstantSDNode>(N)->getZExtValue();
bool UseCP = true;
- if (Subtarget->isThumb()) {
- if (Subtarget->hasThumb2())
- // Thumb2 has the MOVT instruction, so all immediates can
- // be done with MOV + MOVT, at worst.
- UseCP = 0;
- else
+ if (Subtarget->hasThumb2())
+ // Thumb2-aware targets have the MOVT instruction, so all immediates can
+ // be done with MOV + MOVT, at worst.
+ UseCP = 0;
+ else {
+ if (Subtarget->isThumb()) {
UseCP = (Val > 255 && // MOV
~Val > 255 && // MOV + MVN
!ARM_AM::isThumbImmShiftedVal(Val)); // MOV + LSL
- } else
- UseCP = (ARM_AM::getSOImmVal(Val) == -1 && // MOV
- ARM_AM::getSOImmVal(~Val) == -1 && // MVN
- !ARM_AM::isSOImmTwoPartVal(Val)); // two instrs.
+ } else
+ UseCP = (ARM_AM::getSOImmVal(Val) == -1 && // MOV
+ ARM_AM::getSOImmVal(~Val) == -1 && // MVN
+ !ARM_AM::isSOImmTwoPartVal(Val)); // two instrs.
+ }
+
if (UseCP) {
SDValue CPIdx =
CurDAG->getTargetConstantPool(ConstantInt::get(