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Another step forward in PPC64 JIT support: we now no-longer need stubs

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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
This commit is contained in:
Chris Lattner
2006-12-11 23:22:45 +00:00
parent a77fa7edbf
commit 57fc62c8d2
5 changed files with 83 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/PowerPC/PPCSubtarget.cpp
+34 -4
View File
@@ -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 @@ static const char *GetCurrentPowerPCCPU() {
#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 @@ PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS, bool is64Bit)
, 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 @@ PPCSubtarget::PPCSubtarget(const Module &M, const std::string &FS, bool is64Bit)
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());
}