1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.h b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
index a8ddb8c62d18..de446f33f5f1 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -443,6 +443,11 @@ public:
                                   EVT VT) const override;
   bool isFPImmLegal(const APFloat &Imm, EVT VT,
                     bool ForCodeSize) const override;
+  bool ShouldShrinkFPConstant(EVT VT) const override {
+    // Do not shrink 64-bit FP constpool entries since LDEB is slower than
+    // LD, and having the full constant in memory enables reg/mem opcodes.
+    return VT != MVT::f64;
+  }
   bool hasInlineStackProbe(MachineFunction &MF) const override;
   bool isLegalICmpImmediate(int64_t Imm) const override;
   bool isLegalAddImmediate(int64_t Imm) const override;