[cfe-commits] r85991 - in /cfe/trunk: include/clang/Driver/Options.def include/clang/Frontend/CompileOptions.h lib/CodeGen/CGDecl.cpp lib/Driver/Tools.cpp tools/clang-cc/clang-cc.cpp

Tanya Lattner tonic at nondot.org
Tue Nov 3 17:18:10 PST 2009


Author: tbrethou
Date: Tue Nov  3 19:18:09 2009
New Revision: 85991

URL: http://llvm.org/viewvc/llvm-project?rev=85991&view=rev
Log:
Merge constant array and structures. This will create a global variables for arrays and structs that are constant and their initializer is constant. It is on by default but can be disable with the flag -fno-merge-all-constants.

Modified:
    cfe/trunk/include/clang/Driver/Options.def
    cfe/trunk/include/clang/Frontend/CompileOptions.h
    cfe/trunk/lib/CodeGen/CGDecl.cpp
    cfe/trunk/lib/Driver/Tools.cpp
    cfe/trunk/tools/clang-cc/clang-cc.cpp

Modified: cfe/trunk/include/clang/Driver/Options.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/Options.def?rev=85991&r1=85990&r2=85991&view=diff

==============================================================================
--- cfe/trunk/include/clang/Driver/Options.def (original)
+++ cfe/trunk/include/clang/Driver/Options.def Tue Nov  3 19:18:09 2009
@@ -404,6 +404,7 @@
 OPTION("-flimited-precision=", flimited_precision_EQ, Joined, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-flto", flto, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fmath-errno", fmath_errno, Flag, f_Group, INVALID, "", 0, 0, 0)
+OPTION("-fmerge-all-constants", fmerge_all_constants, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fmessage-length=", fmessage_length_EQ, Joined, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fms-extensions", fms_extensions, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fmudflapth", fmudflapth, Flag, f_Group, INVALID, "", 0, 0, 0)
@@ -428,6 +429,7 @@
 OPTION("-fno-inline", fno_inline, Flag, clang_ignored_f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fno-keep-inline-functions", fno_keep_inline_functions, Flag, clang_ignored_f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fno-math-errno", fno_math_errno, Flag, f_Group, INVALID, "", 0, 0, 0)
+OPTION("-fno-merge-all-constants", fno_merge_all_constants, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fno-omit-frame-pointer", fno_omit_frame_pointer, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fno-pascal-strings", fno_pascal_strings, Flag, f_Group, INVALID, "", 0, 0, 0)
 OPTION("-fno-rtti", fno_rtti, Flag, f_Group, INVALID, "", 0, 0, 0)

Modified: cfe/trunk/include/clang/Frontend/CompileOptions.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Frontend/CompileOptions.h?rev=85991&r1=85990&r2=85991&view=diff

==============================================================================
--- cfe/trunk/include/clang/Frontend/CompileOptions.h (original)
+++ cfe/trunk/include/clang/Frontend/CompileOptions.h Tue Nov  3 19:18:09 2009
@@ -43,7 +43,8 @@
   unsigned NoCommon          : 1; /// Set when -fno-common or C++ is enabled.
   unsigned DisableRedZone    : 1; /// Set when -mno-red-zone is enabled.
   unsigned NoImplicitFloat   : 1; /// Set when -mno-implicit-float is enabled.
-
+  unsigned MergeAllConstants : 1; // Merge identical constants.
+  
   /// Inlining - The kind of inlining to perform.
   InliningMethod Inlining;
 
@@ -67,6 +68,7 @@
     Inlining = NoInlining;
     DisableRedZone = 0;
     NoImplicitFloat = 0;
+    MergeAllConstants = 1;
   }
 };
 

Modified: cfe/trunk/lib/CodeGen/CGDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGDecl.cpp?rev=85991&r1=85990&r2=85991&view=diff

==============================================================================
--- cfe/trunk/lib/CodeGen/CGDecl.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGDecl.cpp Tue Nov  3 19:18:09 2009
@@ -19,6 +19,7 @@
 #include "clang/AST/DeclObjC.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
+#include "clang/Frontend/CompileOptions.h"
 #include "llvm/GlobalVariable.h"
 #include "llvm/Intrinsics.h"
 #include "llvm/Target/TargetData.h"
@@ -316,6 +317,20 @@
   llvm::Value *DeclPtr;
   if (Ty->isConstantSizeType()) {
     if (!Target.useGlobalsForAutomaticVariables()) {
+      
+      // All constant structs and arrays should be global if
+      // their initializer is constant and if the element type is POD.
+      if (CGM.getCompileOpts().MergeAllConstants) {
+        if (Ty.isConstant(getContext())
+            && (Ty->isArrayType() || Ty->isRecordType())
+            && (D.getInit() 
+                && D.getInit()->isConstantInitializer(getContext()))
+            && Ty->isPODType()) {
+          EmitStaticBlockVarDecl(D);
+          return;
+        }
+      }
+      
       // A normal fixed sized variable becomes an alloca in the entry block.
       const llvm::Type *LTy = ConvertTypeForMem(Ty);
       Align = getContext().getDeclAlignInBytes(&D);

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=85991&r1=85990&r2=85991&view=diff

==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Tue Nov  3 19:18:09 2009
@@ -703,6 +703,9 @@
     CmdArgs.push_back("--debug-pass=Structure");
   if (Args.hasArg(options::OPT_fdebug_pass_arguments))
     CmdArgs.push_back("--debug-pass=Arguments");
+  if (!Args.hasFlag(options::OPT_fmerge_all_constants,
+                    options::OPT_fno_merge_all_constants))
+    CmdArgs.push_back("--no-merge-all-constants");
 
   // This is a coarse approximation of what llvm-gcc actually does, both
   // -fasynchronous-unwind-tables and -fnon-call-exceptions interact in more

Modified: cfe/trunk/tools/clang-cc/clang-cc.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/tools/clang-cc/clang-cc.cpp?rev=85991&r1=85990&r2=85991&view=diff

==============================================================================
--- cfe/trunk/tools/clang-cc/clang-cc.cpp (original)
+++ cfe/trunk/tools/clang-cc/clang-cc.cpp Tue Nov  3 19:18:09 2009
@@ -653,6 +653,10 @@
 NoElideConstructors("fno-elide-constructors",
                     llvm::cl::desc("Disable C++ copy constructor elision"));
 
+static llvm::cl::opt<bool>
+NoMergeConstants("fno-merge-all-constants",
+                       llvm::cl::desc("Disallow merging of constants."));
+
 static llvm::cl::opt<std::string>
 TargetABI("target-abi",
           llvm::cl::desc("Target a particular ABI type"));
@@ -1372,6 +1376,8 @@
 
   Opts.DisableRedZone = DisableRedZone;
   Opts.NoImplicitFloat = NoImplicitFloat;
+  
+  Opts.MergeAllConstants = !NoMergeConstants;
 }
 
 //===----------------------------------------------------------------------===//





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