Implement longdouble as a wrapper around llvm::APFloat.

This commit introduces a new class ldc::longdouble which provides real_t
semantics based on the target. It uses llvm::APFloat as base implementation.

This fixes issue ldc-developers#259.

Author: redstar

CMakeLists.txt

@@ -8,6 +8,7 @@ if(MSVC)
 endif()
 
 include(CheckIncludeFile)
+include(CheckSymbolExists)
 include(CheckLibraryExists)
 
 #
@@ -238,26 +239,6 @@ list(REMOVE_ITEM FE_SRC
     ${PROJECT_SOURCE_DIR}/${DMDFE_PATH}/id.c
     ${PROJECT_SOURCE_DIR}/${DMDFE_PATH}/impcnvtab.c
 )
-# Add/remove files for MSVC
-if(MSVC)
-    list(APPEND FE_SRC
-        ${PROJECT_SOURCE_DIR}/vcbuild/strtold.c
-# See below why this don't work
-#        if(CMAKE_CL_64)
-#        ${PROJECT_SOURCE_DIR}/vcbuild/ldfpu.asm
-#        endif()
-    )
-    if(CMAKE_CL_64)
-        # MASM support does not work yet!
-        add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/ldfpu.obj
-                           COMMAND ${CMAKE_ASM_MASM_COMPILER} /c /Fo${CMAKE_CURRENT_BINARY_DIR}/ldfpu.obj ${PROJECT_SOURCE_DIR}/vcbuild/ldfpu.asm
-                           DEPENDS ${PROJECT_SOURCE_DIR}/vcbuild/ldfpu.asm
-                           COMMENT "generate ldfpu.obj")
-        list(APPEND FE_SRC
-            ${CMAKE_CURRENT_BINARY_DIR}/ldfpu.obj
-    )
-    endif()
-endif()
 set(LDC_SOURCE_FILES
     ${LDC_GENERATED}
     ${FE_SRC}
@@ -338,6 +319,27 @@ else()
     set(EXTRA_CXXFLAGS "-fexceptions")
 endif()
 
+#
+# check string functions
+#
+check_symbol_exists(memicmp "string.h" HAVE_MEMICMP)
+check_symbol_exists(stricmp "string.h" HAVE_STRICMP)
+check_symbol_exists(strupr "string.h" HAVE_STRUPR)
+check_symbol_exists(strtof "stdlib.h" HAVE_STRTOF)
+
+if(HAVE_MEMICMP)
+    add_definitions(-DHAVE_MEMICMP)
+endif()
+
+if(HAVE_STRICMP)
+    add_definitions(-DHAVE_STRICMP)
+endif()
+
+if(HAVE_STRUPR)
+    add_definitions(-DHAVE_STRUPR)
+endif()
+
+
 #
 # Check endianess.
 # There is no realiable way to delegate the work to the compiler.
@@ -468,7 +470,6 @@ endif()
 #
 # LDMD
 #
-include(CheckSymbolExists)
 CHECK_SYMBOL_EXISTS(_SC_ARG_MAX "unistd.h" HAVE_SC_ARG_MAX)
 if (HAVE_SC_ARG_MAX)
    add_definitions(-DHAVE_SC_ARG_MAX)

dmd2/builtin.c

@@ -43,6 +43,7 @@ Expression *eval_unimp(Loc loc, FuncDeclaration *fd, Expressions *arguments)
     return NULL;
 }
 
+#if !IN_LLVM
 Expression *eval_sin(Loc loc, FuncDeclaration *fd, Expressions *arguments)
 {
     Expression *arg0 = (*arguments)[0];
@@ -63,6 +64,7 @@ Expression *eval_tan(Loc loc, FuncDeclaration *fd, Expressions *arguments)
     assert(arg0->op == TOKfloat64);
     return new RealExp(loc, tanl(arg0->toReal()), arg0->type);
 }
+#endif
 
 Expression *eval_sqrt(Loc loc, FuncDeclaration *fd, Expressions *arguments)
 {
@@ -133,18 +135,30 @@ void builtin_init()
     builtins._init(45);
 
     // @safe pure nothrow real function(real)
+#if IN_LLVM
+    add_builtin("_D4core4math3sinFNaNbNfeZe", &eval_unimp);
+    add_builtin("_D4core4math3cosFNaNbNfeZe", &eval_unimp);
+    add_builtin("_D4core4math3tanFNaNbNfeZe", &eval_unimp);
+#else
     add_builtin("_D4core4math3sinFNaNbNfeZe", &eval_sin);
     add_builtin("_D4core4math3cosFNaNbNfeZe", &eval_cos);
     add_builtin("_D4core4math3tanFNaNbNfeZe", &eval_tan);
+#endif
     add_builtin("_D4core4math4sqrtFNaNbNfeZe", &eval_sqrt);
     add_builtin("_D4core4math4fabsFNaNbNfeZe", &eval_fabs);
     add_builtin("_D4core4math5expm1FNaNbNfeZe", &eval_unimp);
     add_builtin("_D4core4math4exp21FNaNbNfeZe", &eval_unimp);
 
     // @trusted pure nothrow real function(real)
+#if IN_LLVM
+    add_builtin("_D4core4math3sinFNaNbNeeZe", &eval_unimp);
+    add_builtin("_D4core4math3cosFNaNbNeeZe", &eval_unimp);
+    add_builtin("_D4core4math3tanFNaNbNeeZe", &eval_unimp);
+#else
     add_builtin("_D4core4math3sinFNaNbNeeZe", &eval_sin);
     add_builtin("_D4core4math3cosFNaNbNeeZe", &eval_cos);
     add_builtin("_D4core4math3tanFNaNbNeeZe", &eval_tan);
+#endif
     add_builtin("_D4core4math4sqrtFNaNbNeeZe", &eval_sqrt);
     add_builtin("_D4core4math4fabsFNaNbNeeZe", &eval_fabs);
     add_builtin("_D4core4math5expm1FNaNbNeeZe", &eval_unimp);
@@ -164,18 +178,30 @@ void builtin_init()
     add_builtin("_D4core4math6rndtolFNaNbNfeZl", &eval_unimp);
 
     // @safe pure nothrow real function(real)
+#if IN_LLVM
+    add_builtin("_D3std4math3sinFNaNbNfeZe", &eval_unimp);
+    add_builtin("_D3std4math3cosFNaNbNfeZe", &eval_unimp);
+    add_builtin("_D3std4math3tanFNaNbNfeZe", &eval_unimp);
+#else
     add_builtin("_D3std4math3sinFNaNbNfeZe", &eval_sin);
     add_builtin("_D3std4math3cosFNaNbNfeZe", &eval_cos);
     add_builtin("_D3std4math3tanFNaNbNfeZe", &eval_tan);
+#endif
     add_builtin("_D3std4math4sqrtFNaNbNfeZe", &eval_sqrt);
     add_builtin("_D3std4math4fabsFNaNbNfeZe", &eval_fabs);
     add_builtin("_D3std4math5expm1FNaNbNfeZe", &eval_unimp);
     add_builtin("_D3std4math4exp21FNaNbNfeZe", &eval_unimp);
 
     // @trusted pure nothrow real function(real)
+#if IN_LLVM
+    add_builtin("_D3std4math3sinFNaNbNeeZe", &eval_unimp);
+    add_builtin("_D3std4math3cosFNaNbNeeZe", &eval_unimp);
+    add_builtin("_D3std4math3tanFNaNbNeeZe", &eval_unimp);
+#else
     add_builtin("_D3std4math3sinFNaNbNeeZe", &eval_sin);
     add_builtin("_D3std4math3cosFNaNbNeeZe", &eval_cos);
     add_builtin("_D3std4math3tanFNaNbNeeZe", &eval_tan);
+#endif
     add_builtin("_D3std4math4sqrtFNaNbNeeZe", &eval_sqrt);
     add_builtin("_D3std4math4fabsFNaNbNeeZe", &eval_fabs);
     add_builtin("_D3std4math5expm1FNaNbNeeZe", &eval_unimp);