[clang] Add support for -fcx-limited-range and #pragma CX_LIMITED_RANGE. (PR #68820)

[via cfe-commits]

github-actions[bot] wrote:


<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff c1b6ed42b75a17d1718aa377f76633b27e15a4e2 91de35737b74233f29da76573b4099bf64e8bdd4 -- clang/test/CodeGen/cx-full-range.c clang/test/CodeGen/pragma-cx-limited-range.c clang/test/CodeGenCXX/cx-limited-range.c clang/include/clang/Parse/Parser.h clang/include/clang/Sema/Sema.h clang/lib/CodeGen/CGExprComplex.cpp clang/lib/Driver/ToolChains/Clang.cpp clang/lib/Parse/ParsePragma.cpp clang/lib/Parse/ParseStmt.cpp clang/lib/Parse/Parser.cpp clang/lib/Sema/SemaAttr.cpp
``````````

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index f206f5de1310..3f49788cf793 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -8452,9 +8452,9 @@ public:
                                          SourceLocation PrevPtOfInstantiation,
                                          bool &SuppressNew);
 
-  bool CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD,
-                    const TemplateArgumentListInfo &ExplicitTemplateArgs,
-                                                    LookupResult &Previous);
+  bool CheckDependentFunctionTemplateSpecialization(
+      FunctionDecl *FD, const TemplateArgumentListInfo &ExplicitTemplateArgs,
+      LookupResult &Previous);
 
   bool CheckFunctionTemplateSpecialization(
       FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs,
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp
index f18fdb170909..2ce60ea1d605 100644
--- a/clang/lib/CodeGen/CGExprComplex.cpp
+++ b/clang/lib/CodeGen/CGExprComplex.cpp
@@ -890,13 +890,13 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
       DSTr = Builder.CreateFDiv(ACpBD, CCpDD);
       DSTi = Builder.CreateFDiv(BCmAD, CCpDD);
     } else if (RHSi && !CGF.getLangOpts().FastMath) {
-    // If we have a complex operand on the RHS and FastMath is not allowed, we
-    // delegate to a libcall to handle all of the complexities and minimize
-    // underflow/overflow cases. When FastMath is allowed we construct the
-    // divide inline using the same algorithm as for integer operands.
-    //
-    // FIXME: We would be able to avoid the libcall in many places if we
-    // supported imaginary types in addition to complex types.
+      // If we have a complex operand on the RHS and FastMath is not allowed, we
+      // delegate to a libcall to handle all of the complexities and minimize
+      // underflow/overflow cases. When FastMath is allowed we construct the
+      // divide inline using the same algorithm as for integer operands.
+      //
+      // FIXME: We would be able to avoid the libcall in many places if we
+      // supported imaginary types in addition to complex types.
       BinOpInfo LibCallOp = Op;
       // If LHS was a real, supply a null imaginary part.
       if (!LHSi)
diff --git a/clang/lib/Parse/ParsePragma.cpp b/clang/lib/Parse/ParsePragma.cpp
index eae4b54ecfc5..6e4db5da9fdb 100644
--- a/clang/lib/Parse/ParsePragma.cpp
+++ b/clang/lib/Parse/ParsePragma.cpp
@@ -873,9 +873,9 @@ void Parser::HandlePragmaCXLimitedRange() {
     IsEnabled = false;
     break;
   case tok::OOS_DEFAULT:
-      // According to ISO C99 standard chapter 7.3.4, the default value
-      // for the pragma is ``off'. In GCC, the option -fcx-limited-range
-      // controls the default setting of the pragma.
+    // According to ISO C99 standard chapter 7.3.4, the default value
+    // for the pragma is ``off'. In GCC, the option -fcx-limited-range
+    // controls the default setting of the pragma.
     IsEnabled = getLangOpts().CxLimitedRange ? true : false;
     break;
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/68820