From b60736ec1405bb0a8dd40989f67ef4c93da068ab Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Tue, 16 Feb 2021 21:13:02 +0100
Subject: Vendor import of llvm-project main 8e464dd76bef, the last commit
 before the upstream release/12.x branch was created.

---
 llvm/lib/IR/ReplaceConstant.cpp | 70 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 llvm/lib/IR/ReplaceConstant.cpp

(limited to 'llvm/lib/IR/ReplaceConstant.cpp')

diff --git a/llvm/lib/IR/ReplaceConstant.cpp b/llvm/lib/IR/ReplaceConstant.cpp
new file mode 100644
index 000000000000..7efa525d427e
--- /dev/null
+++ b/llvm/lib/IR/ReplaceConstant.cpp
@@ -0,0 +1,70 @@
+//===- ReplaceConstant.cpp - Replace LLVM constant expression--------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a utility function for replacing LLVM constant
+// expressions by instructions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/ReplaceConstant.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/NoFolder.h"
+
+namespace llvm {
+// Replace a constant expression by instructions with equivalent operations at
+// a specified location.
+Instruction *createReplacementInstr(ConstantExpr *CE, Instruction *Instr) {
+  IRBuilder<NoFolder> Builder(Instr);
+  unsigned OpCode = CE->getOpcode();
+  switch (OpCode) {
+  case Instruction::GetElementPtr: {
+    SmallVector<Value *, 4> CEOpVec(CE->operands());
+    ArrayRef<Value *> CEOps(CEOpVec);
+    return dyn_cast<Instruction>(
+        Builder.CreateInBoundsGEP(cast<GEPOperator>(CE)->getSourceElementType(),
+                                  CEOps[0], CEOps.slice(1)));
+  }
+  case Instruction::Add:
+  case Instruction::Sub:
+  case Instruction::Mul:
+  case Instruction::UDiv:
+  case Instruction::SDiv:
+  case Instruction::FDiv:
+  case Instruction::URem:
+  case Instruction::SRem:
+  case Instruction::FRem:
+  case Instruction::Shl:
+  case Instruction::LShr:
+  case Instruction::AShr:
+  case Instruction::And:
+  case Instruction::Or:
+  case Instruction::Xor:
+    return dyn_cast<Instruction>(
+        Builder.CreateBinOp((Instruction::BinaryOps)OpCode, CE->getOperand(0),
+                            CE->getOperand(1), CE->getName()));
+  case Instruction::Trunc:
+  case Instruction::ZExt:
+  case Instruction::SExt:
+  case Instruction::FPToUI:
+  case Instruction::FPToSI:
+  case Instruction::UIToFP:
+  case Instruction::SIToFP:
+  case Instruction::FPTrunc:
+  case Instruction::FPExt:
+  case Instruction::PtrToInt:
+  case Instruction::IntToPtr:
+  case Instruction::BitCast:
+    return dyn_cast<Instruction>(
+        Builder.CreateCast((Instruction::CastOps)OpCode, CE->getOperand(0),
+                           CE->getType(), CE->getName()));
+  default:
+    llvm_unreachable("Unhandled constant expression!\n");
+  }
+}
+} // namespace llvm
-- 
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