There are two reasons why we might want to use

foo = a - b
.long foo
instead of just
.long a - b

First, on darwin9 64 bits the assembler produces the wrong result. Second,
if "a" is the end of the section all darwin assemblers (9, 10 and mc) will not
consider a - b to be a constant but will if the dummy foo is created.

Split how we handle these cases. The first one is something MC should take care
of. The second one has to be handled by the caller.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120889 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 10 insertions, 3 deletions

diff --git a/lib/Target/PTX/PTXMCAsmStreamer.cpp b/lib/Target/PTX/PTXMCAsmStreamer.cpp
index 8043baf..4e517ad 100644
--- a/lib/Target/PTX/PTXMCAsmStreamer.cpp
+++ b/lib/Target/PTX/PTXMCAsmStreamer.cpp
@@ -147,8 +147,7 @@ public:
 
   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
 
-  virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace,
-                         bool UseSet = false);
+  virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
   virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
   virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
   virtual void EmitGPRel32Value(const MCExpr *Value);
@@ -361,7 +360,7 @@ void PTXMCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
 }
 
 void PTXMCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
-                                 unsigned AddrSpace, bool UseSet) {
+                                 unsigned AddrSpace) {
   assert(CurSection && "Cannot emit contents before setting section!");
   const char *Directive = 0;
   switch (Size) {
diff --git a/lib/Target/PowerPC/PPCMCAsmInfo.cpp b/lib/Target/PowerPC/PPCMCAsmInfo.cpp
index 3644c79..89c8cb6 100644
--- a/lib/Target/PowerPC/PPCMCAsmInfo.cpp
+++ b/lib/Target/PowerPC/PPCMCAsmInfo.cpp
@@ -21,6 +21,10 @@ PPCMCAsmInfoDarwin::PPCMCAsmInfoDarwin(bool is64Bit) {
 
   if (!is64Bit)
     Data64bitsDirective = 0;      // We can't emit a 64-bit unit in PPC32 mode.
+
+  if (is64Bit)
+    NeedsSetToChangeDiffSize = true;
+
   AssemblerDialect = 1;           // New-Style mnemonics.
   SupportsDebugInformation= true; // Debug information.
 }
diff --git a/lib/Target/X86/X86MCAsmInfo.cpp b/lib/Target/X86/X86MCAsmInfo.cpp
index f45fdf5..1ac2d7e 100644
--- a/lib/Target/X86/X86MCAsmInfo.cpp
+++ b/lib/Target/X86/X86MCAsmInfo.cpp
@@ -56,6 +56,10 @@ X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
   if (!is64Bit)
     Data64bitsDirective = 0;       // we can't emit a 64-bit unit
 
+  // FIXME: Darwin 10 doesn't need this.
+  if (is64Bit)
+    NeedsSetToChangeDiffSize = true;
+
   // Use ## as a comment string so that .s files generated by llvm can go
   // through the GCC preprocessor without causing an error.  This is needed
   // because "clang foo.s" runs the C preprocessor, which is usually reserved