0073-RISCV-Implement-isLegalAddImmediate.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Alex Bradbury <asb@lowrisc.org>
Subject: [RISCV] Implement isLegalAddImmediate

There are some very minor codegen changes in a small subset of the GCC torture
suite.
---
 lib/Target/RISCV/RISCVISelLowering.cpp | 4 ++++
 lib/Target/RISCV/RISCVISelLowering.h   | 1 +
 2 files changed, 5 insertions(+)

diff --git a/lib/Target/RISCV/RISCVISelLowering.cpp b/lib/Target/RISCV/RISCVISelLowering.cpp
index e9c003aeba9..9ab1270f2f8 100644
--- a/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -173,6 +173,10 @@ bool RISCVTargetLowering::isLegalAddressingMode(const DataLayout &DL,
   return true;
 }
 
+bool RISCVTargetLowering::isLegalAddImmediate(int64_t Imm) const {
+  return isInt<12>(Imm);
+}
+
 // Changes the condition code and swaps operands if necessary, so the SetCC
 // operation matches one of the comparisons supported directly in the RISC-V
 // ISA.
diff --git a/lib/Target/RISCV/RISCVISelLowering.h b/lib/Target/RISCV/RISCVISelLowering.h
index e7dd46fc835..eae01bae883 100644
--- a/lib/Target/RISCV/RISCVISelLowering.h
+++ b/lib/Target/RISCV/RISCVISelLowering.h
@@ -40,6 +40,7 @@ public:
   bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
                              unsigned AS,
                              Instruction *I = nullptr) const override;
+  bool isLegalAddImmediate(int64_t Imm) const override;
 
   // Provide custom lowering hooks for some operations.
   SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
-- 
2.16.2