[llvm] Analysis: Move LibcallLoweringInfo from CodeGen to Analysis (PR #210322)

[Benjamin Maxwell via llvm-commits]

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@@ -0,0 +1,160 @@
+//===- LibcallLoweringInfo.h ------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Tracks which library function implementations to use for depending on a
+// calling context (e.g., which library function a particular subtarget should
+// use).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_LIBCALLLOWERINGINFO_H
+#define LLVM_ANALYSIS_LIBCALLLOWERINGINFO_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/STLFunctionalExtras.h"
+#include "llvm/Analysis/RuntimeLibcallInfo.h"
+#include "llvm/IR/RuntimeLibcalls.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+/// Tracks which library functions to use for a particular subtarget or
+/// function.
+class LibcallLoweringInfo {
+private:
+  const RTLIB::RuntimeLibcallsInfo &RTLCI;
+  /// Stores the implementation choice for each libcall.
+  RTLIB::LibcallImpl LibcallImpls[RTLIB::UNKNOWN_LIBCALL + 1] = {
+      RTLIB::Unsupported};
+
+public:
+  /// Callback applying the caller's context-specific (e.g. subtarget) libcall
+  /// rules on top of the module-level defaults.
+  using ApplyContextRulesFn = function_ref<void(LibcallLoweringInfo &)>;
+
+  /// Construct the lowering info from the module-level \p RTLCI, seeding the
+  /// default implementation for every available libcall, then applying the
+  /// optional \p ApplyContextRules callback for the caller's context-specific
+  /// libcall rules.
+  LLVM_ABI LibcallLoweringInfo(const RTLIB::RuntimeLibcallsInfo &RTLCI,
+                               ApplyContextRulesFn ApplyContextRules = {});
+
+  const RTLIB::RuntimeLibcallsInfo &getRuntimeLibcallsInfo() const {
+    return RTLCI;
+  }
+
+  /// Get the libcall routine name for the specified libcall.
+  // FIXME: This should be removed. Only LibcallImpl should have a name.
+  const char *getLibcallName(RTLIB::Libcall Call) const {
+    // FIXME: Return StringRef
+    return RTLIB::RuntimeLibcallsInfo::getLibcallImplName(LibcallImpls[Call])
+        .data();
+  }
+
+  /// Return the lowering's selection of implementation call for \p Call
+  RTLIB::LibcallImpl getLibcallImpl(RTLIB::Libcall Call) const {
+    return LibcallImpls[Call];
+  }
+
+  /// Rename the default libcall routine name for the specified libcall.
----------------
MacDue wrote:

Rename -> Remap?

https://github.com/llvm/llvm-project/pull/210322