Another step forward in PPC64 JIT support: we now no-longer need stubs
emitted for external globals in PPC64-JIT-PIC mode (which is good because
we didn't handle them before!).
This also fixes a bug handling the picbase delta, which we would get wrong
in some cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32451 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp
index 5c18e65..eca16c4 100644
--- a/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -14,6 +14,7 @@
#include "PPCSubtarget.h"
#include "PPC.h"
#include "llvm/Module.h"
+#include "llvm/Target/TargetMachine.h"
#include "PPCGenSubtarget.inc"
using namespace llvm;
@@ -55,9 +56,10 @@
#endif
-PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS, bool is64Bit)
- : StackAlignment(16)
- , InstrItins()
+PPCSubtarget::PPCSubtarget(const TargetMachine &tm, const Module &M,
+ const std::string &FS, bool is64Bit)
+ : TM(tm)
+ , StackAlignment(16)
, IsGigaProcessor(false)
, Has64BitSupport(false)
, Use64BitRegs(false)
@@ -65,7 +67,8 @@
, HasAltivec(false)
, HasFSQRT(false)
, HasSTFIWX(false)
- , IsDarwin(false) {
+ , IsDarwin(false)
+ , HasLazyResolverStubs(false) {
// Determine default and user specified characteristics
std::string CPU = "generic";
@@ -105,4 +108,31 @@
IsDarwin = true;
#endif
}
+
+ // Set up darwin-specific properties.
+ if (IsDarwin) {
+ HasLazyResolverStubs = true;
+ }
+}
+
+/// SetJITMode - This is called to inform the subtarget info that we are
+/// producing code for the JIT.
+void PPCSubtarget::SetJITMode() {
+ // JIT mode doesn't want lazy resolver stubs, it knows exactly where
+ // everything is. This matters for PPC64, which codegens in PIC mode without
+ // stubs.
+ HasLazyResolverStubs = false;
+}
+
+
+/// hasLazyResolverStub - Return true if accesses to the specified global have
+/// to go through a dyld lazy resolution stub. This means that an extra load
+/// is required to get the address of the global.
+bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV) const {
+ // We never hae stubs if HasLazyResolverStubs=false or if in static mode.
+ if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
+ return false;
+
+ return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
+ (GV->isExternal() && !GV->hasNotBeenReadFromBytecode());
}