[PATCH] D141796: [15/15][Clang][RISCV][NFC] Set data member under Policy as constants

[Yueh-Ting (eop) Chen via Phabricator via cfe-commits]

eopXD updated this revision to Diff 492420.
eopXD added a comment.

Rebase to latest main.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D141796/new/

https://reviews.llvm.org/D141796

Files:
  clang/include/clang/Support/RISCVVIntrinsicUtils.h
  clang/lib/Support/RISCVVIntrinsicUtils.cpp


Index: clang/lib/Support/RISCVVIntrinsicUtils.cpp
===================================================================
--- clang/lib/Support/RISCVVIntrinsicUtils.cpp
+++ clang/lib/Support/RISCVVIntrinsicUtils.cpp
@@ -1017,7 +1017,6 @@
   };
 
   if (PolicyAttrs.isUnspecified()) {
-    PolicyAttrs.IsUnspecified = false;
     if (IsMasked) {
       Name += "_m";
       if (HasPolicy)
Index: clang/include/clang/Support/RISCVVIntrinsicUtils.h
===================================================================
--- clang/include/clang/Support/RISCVVIntrinsicUtils.h
+++ clang/include/clang/Support/RISCVVIntrinsicUtils.h
@@ -92,15 +92,22 @@
   LLVM_MARK_AS_BITMASK_ENUM(LMUL1),
 };
 
-struct Policy {
-  bool IsUnspecified = false;
+class Policy {
+public:
   enum PolicyType {
     Undisturbed,
     Agnostic,
   };
-  PolicyType TailPolicy = Agnostic;
-  PolicyType MaskPolicy = Agnostic;
+
+private:
+  const bool IsUnspecified = false;
+  // The default assumption for an RVV instruction is TAMA, as an undisturbed
+  // policy generally will affect the performance of an out-of-order core.
+  const PolicyType TailPolicy = Agnostic;
+  const PolicyType MaskPolicy = Agnostic;
   bool HasTailPolicy, HasMaskPolicy;
+
+public:
   Policy(bool HasTailPolicy, bool HasMaskPolicy)
       : IsUnspecified(true), HasTailPolicy(HasTailPolicy),
         HasMaskPolicy(HasMaskPolicy) {}
@@ -422,7 +429,6 @@
     return IntrinsicTypes;
   }
   Policy getPolicyAttrs() const {
-    assert(PolicyAttrs.IsUnspecified == false);
     return PolicyAttrs;
   }
   unsigned getPolicyAttrsBits() const {
@@ -431,8 +437,6 @@
     // The 1st bit simulates the `vma` of RVV
     // int PolicyAttrs = 0;
 
-    assert(PolicyAttrs.IsUnspecified == false);
-
     if (PolicyAttrs.isTUMAPolicy())
       return 2;
     if (PolicyAttrs.isTAMAPolicy())


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