Do away with addLegalFPImmediate. Add a target hook isFPImmLegal which returns true if the fp immediate can be natively codegened by target.
llvm-svn: 85281
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 07e0d83..eb4d250 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -53,11 +53,6 @@
if (!UseSoftFloat) {
addRegisterClass(MVT::f32, SystemZ::FP32RegisterClass);
addRegisterClass(MVT::f64, SystemZ::FP64RegisterClass);
-
- addLegalFPImmediate(APFloat(+0.0)); // lzer
- addLegalFPImmediate(APFloat(+0.0f)); // lzdr
- addLegalFPImmediate(APFloat(-0.0)); // lzer + lner
- addLegalFPImmediate(APFloat(-0.0f)); // lzdr + lndr
}
// Compute derived properties from the register classes
@@ -169,6 +164,17 @@
}
}
+bool SystemZTargetLowering::isFPImmLegal(const APFloat &Imm) const {
+ if (UseSoftFloat)
+ return false;
+
+ // +0.0 lzer
+ // +0.0f lzdr
+ // -0.0 lzer + lner
+ // -0.0f lzdr + lndr
+ return Imm.isZero() || Imm.isNegZero();
+}
+
//===----------------------------------------------------------------------===//
// SystemZ Inline Assembly Support
//===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.h b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
index c2c24bc..76af03d 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -89,6 +89,11 @@
MachineBasicBlock *BB,
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
+ /// isFPImmLegal - Returns true if the target can instruction select the
+ /// specified FP immediate natively. If false, the legalizer will
+ /// materialize the FP immediate as a load from a constant pool.
+ virtual bool isFPImmLegal(const APFloat &Imm) const;
+
private:
SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,