Reland [X86] With large code model, put functions into .ltext with large section flag (#73037)

So that when mixing small and large text, large text stays out of the
way of the rest of the binary.

This is useful for mixing precompiled small code model object files and
built-from-source large code model binaries so that the the text
sections don't get merged.

The reland fixes an issue where a function in the large code model would reference small data without GOTOFF.

1 files changed, 4 insertions, 11 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index f3ba38081..143a495 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -616,7 +616,7 @@ static unsigned getEntrySizeForKind(SectionKind Kind) {
 /// DataSections.
 static StringRef getSectionPrefixForGlobal(SectionKind Kind, bool IsLarge) {
   if (Kind.isText())
-    return ".text";
+    return IsLarge ? ".ltext" : ".text";
   if (Kind.isReadOnly())
     return IsLarge ? ".lrodata" : ".rodata";
   if (Kind.isBSS())
@@ -650,10 +650,7 @@ getELFSectionNameForGlobal(const GlobalObject *GO, SectionKind Kind,
     Name = ".rodata.cst";
     Name += utostr(EntrySize);
   } else {
-    bool IsLarge = false;
-    if (auto *GV = dyn_cast<GlobalVariable>(GO))
-      IsLarge = TM.isLargeData(GV);
-    Name = getSectionPrefixForGlobal(Kind, IsLarge);
+    Name = getSectionPrefixForGlobal(Kind, TM.isLargeGlobalObject(GO));
   }
 
   bool HasPrefix = false;
@@ -773,12 +770,8 @@ getGlobalObjectInfo(const GlobalObject *GO, const TargetMachine &TM) {
     Group = C->getName();
     IsComdat = C->getSelectionKind() == Comdat::Any;
   }
-  if (auto *GV = dyn_cast<GlobalVariable>(GO)) {
-    if (TM.isLargeData(GV)) {
-      assert(TM.getTargetTriple().getArch() == Triple::x86_64);
-      Flags |= ELF::SHF_X86_64_LARGE;
-    }
-  }
+  if (TM.isLargeGlobalObject(GO))
+    Flags |= ELF::SHF_X86_64_LARGE;
   return {Group, IsComdat, Flags};
 }