[NFC][clang] Move simplifyConstraint to TargetInfo.cpp (#154905)

Co-authored-by: Andy Kaylor <akaylor@nvidia.com>

Author: el-ev

clang/include/clang/Basic/TargetInfo.h

@@ -1259,6 +1259,10 @@ class TargetInfo : public TransferrableTargetInfo,
                            ArrayRef<ConstraintInfo> OutputConstraints,
                            unsigned &Index) const;
 
+  std::string
+  simplifyConstraint(StringRef Constraint,
+                     SmallVectorImpl<ConstraintInfo> *OutCons = nullptr) const;
+
   // Constraint parm will be left pointing at the last character of
   // the constraint.  In practice, it won't be changed unless the
   // constraint is longer than one character.

clang/lib/Basic/TargetInfo.cpp

@@ -18,6 +18,7 @@
 #include "clang/Basic/LangOptions.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/TargetParser/TargetParser.h"
 #include <cstdlib>
@@ -1042,3 +1043,51 @@ void TargetInfo::copyAuxTarget(const TargetInfo *Aux) {
   auto *Src = static_cast<const TransferrableTargetInfo*>(Aux);
   *Target = *Src;
 }
+
+std::string
+TargetInfo::simplifyConstraint(StringRef Constraint,
+                               SmallVectorImpl<ConstraintInfo> *OutCons) const {
+  std::string Result;
+
+  for (const char *I = Constraint.begin(), *E = Constraint.end(); I < E; I++) {
+    switch (*I) {
+    default:
+      Result += convertConstraint(I);
+      break;
+    // Ignore these
+    case '*':
+    case '?':
+    case '!':
+    case '=': // Will see this and the following in mult-alt constraints.
+    case '+':
+      break;
+    case '#': // Ignore the rest of the constraint alternative.
+      while (I + 1 != E && I[1] != ',')
+        I++;
+      break;
+    case '&':
+    case '%':
+      Result += *I;
+      while (I + 1 != E && I[1] == *I)
+        I++;
+      break;
+    case ',':
+      Result += "|";
+      break;
+    case 'g':
+      Result += "imr";
+      break;
+    case '[': {
+      assert(OutCons &&
+             "Must pass output names to constraints with a symbolic name");
+      unsigned Index;
+      bool ResolveResult = resolveSymbolicName(I, *OutCons, Index);
+      assert(ResolveResult && "Could not resolve symbolic name");
+      (void)ResolveResult;
+      Result += llvm::utostr(Index);
+      break;
+    }
+    }
+  }
+  return Result;
+}

clang/lib/CodeGen/CGStmt.cpp

@@ -2471,56 +2471,6 @@ void CodeGenFunction::EmitSwitchStmt(const SwitchStmt &S) {
   CaseRangeBlock = SavedCRBlock;
 }
 
-static std::string
-SimplifyConstraint(const char *Constraint, const TargetInfo &Target,
-                 SmallVectorImpl<TargetInfo::ConstraintInfo> *OutCons=nullptr) {
-  std::string Result;
-
-  while (*Constraint) {
-    switch (*Constraint) {
-    default:
-      Result += Target.convertConstraint(Constraint);
-      break;
-    // Ignore these
-    case '*':
-    case '?':
-    case '!':
-    case '=': // Will see this and the following in mult-alt constraints.
-    case '+':
-      break;
-    case '#': // Ignore the rest of the constraint alternative.
-      while (Constraint[1] && Constraint[1] != ',')
-        Constraint++;
-      break;
-    case '&':
-    case '%':
-      Result += *Constraint;
-      while (Constraint[1] && Constraint[1] == *Constraint)
-        Constraint++;
-      break;
-    case ',':
-      Result += "|";
-      break;
-    case 'g':
-      Result += "imr";
-      break;
-    case '[': {
-      assert(OutCons &&
-             "Must pass output names to constraints with a symbolic name");
-      unsigned Index;
-      bool result = Target.resolveSymbolicName(Constraint, *OutCons, Index);
-      assert(result && "Could not resolve symbolic name"); (void)result;
-      Result += llvm::utostr(Index);
-      break;
-    }
-    }
-
-    Constraint++;
-  }
-
-  return Result;
-}
-
 /// AddVariableConstraints - Look at AsmExpr and if it is a variable declared
 /// as using a particular register add that as a constraint that will be used
 /// in this asm stmt.
@@ -2899,8 +2849,8 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
 
     // Simplify the output constraint.
     std::string OutputConstraint(S.getOutputConstraint(i));
-    OutputConstraint = SimplifyConstraint(OutputConstraint.c_str() + 1,
-                                          getTarget(), &OutputConstraintInfos);
+    OutputConstraint = getTarget().simplifyConstraint(
+        StringRef(OutputConstraint).substr(1), &OutputConstraintInfos);
 
     const Expr *OutExpr = S.getOutputExpr(i);
     OutExpr = OutExpr->IgnoreParenNoopCasts(getContext());
@@ -3062,8 +3012,8 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
 
     // Simplify the input constraint.
     std::string InputConstraint(S.getInputConstraint(i));
-    InputConstraint = SimplifyConstraint(InputConstraint.c_str(), getTarget(),
-                                         &OutputConstraintInfos);
+    InputConstraint =
+        getTarget().simplifyConstraint(InputConstraint, &OutputConstraintInfos);
 
     InputConstraint = AddVariableConstraints(
         InputConstraint, *InputExpr->IgnoreParenNoopCasts(getContext()),