X86-Windows: Emit an undefined global __fltused symbol when targeting Windows
if any floating point arguments are passed to an external function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116665 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index 347d8c7..25dda0a 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -256,7 +256,8 @@
MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI)
: ImmutablePass(ID), Context(MAI),
ObjFileMMI(0),
- CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0), DbgInfoAvailable(false){
+ CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0), DbgInfoAvailable(false),
+ CallsExternalFunctionWithFloatingPointArguments(false) {
// Always emit some info, by default "no personality" info.
Personalities.push_back(NULL);
AddrLabelSymbols = 0;
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index ebc6d38..04c424f 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -15,6 +15,7 @@
#include "SDNodeDbgValue.h"
#include "SelectionDAGBuilder.h"
#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/ConstantFolding.h"
@@ -5019,6 +5020,25 @@
}
}
+ // See if any floating point values are being passed to this external
+ // function. This is used to emit an undefined reference to fltused on
+ // Windows.
+ if (!F->hasLocalLinkage() && F->hasName()) {
+ MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI();
+ for (unsigned i = 0, e = I.getNumArgOperands(); i != e &&
+ !MMI.callsExternalFunctionWithFloatingPointArguments(); ++i) {
+ const Type* T = I.getArgOperand(i)->getType();
+ for (po_iterator<const Type*> i = po_begin(T),
+ e = po_end(T);
+ i != e; ++i) {
+ if (i->isFloatingPointTy()) {
+ MMI.setCallsExternalFunctionWithFloatingPointArguments(true);
+ break;
+ }
+ }
+ }
+ }
+
// Check for well-known libc/libm calls. If the function is internal, it
// can't be a library call.
if (!F->hasLocalLinkage() && F->hasName()) {
diff --git a/lib/Target/X86/X86AsmPrinter.cpp b/lib/Target/X86/X86AsmPrinter.cpp
index 85441b1..c4fd729 100644
--- a/lib/Target/X86/X86AsmPrinter.cpp
+++ b/lib/Target/X86/X86AsmPrinter.cpp
@@ -580,6 +580,13 @@
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
}
+ if (Subtarget->isTargetWindows()
+ && !Subtarget->isTargetCygMing()
+ && MMI->callsExternalFunctionWithFloatingPointArguments()) {
+ MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("__fltused"));
+ OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
+ }
+
if (Subtarget->isTargetCOFF()) {
X86COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<X86COFFMachineModuleInfo>();