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https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 05:29:24 +00:00
* Fix one more bug in PIC codegen: extra load is needed for *all*
non-statics. * Introduce new option to output zero-initialized data to .bss section. This can reduce size of binaries. Enable it by default for ELF & Cygwin/Mingw targets. Probably, Darwin should be also added. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33299 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -39,6 +39,10 @@ namespace llvm {
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///
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const char *DataSection; // Defaults to ".data".
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/// BSSSection - Section directive for uninitialized data.
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///
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const char *BSSSection; // Default to ".bss".
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/// AddressSize - Size of addresses used in file.
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///
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unsigned AddressSize; // Defaults to 4.
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@ -313,6 +317,9 @@ namespace llvm {
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const char *getDataSection() const {
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return DataSection;
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}
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const char *getBSSSection() const {
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return BSSSection;
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}
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unsigned getAddressSize() const {
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return AddressSize;
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}
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@ -54,6 +54,8 @@ namespace llvm {
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/// generate libcalls to the software floating point library instead of
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/// target FP instructions.
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extern bool UseSoftFloat;
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extern bool NoZerosInBSS;
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} // End llvm namespace
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#endif
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@ -19,6 +19,7 @@ using namespace llvm;
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TargetAsmInfo::TargetAsmInfo() :
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TextSection(".text"),
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DataSection(".data"),
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BSSSection(".bss"),
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AddressSize(4),
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NeedsSet(false),
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MaxInstLength(4),
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@ -28,6 +28,7 @@ namespace llvm {
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bool UnsafeFPMath;
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bool FiniteOnlyFPMathOption;
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bool UseSoftFloat;
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bool NoZerosInBSS;
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Reloc::Model RelocationModel;
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CodeModel::Model CMModel;
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}
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@ -61,6 +62,11 @@ namespace {
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cl::desc("Generate software floating point library calls"),
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cl::location(UseSoftFloat),
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cl::init(false));
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cl::opt<bool, true>
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DontPlaceZerosInBSS("nozero-initialized-in-bss",
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cl::desc("Don't place zero-initialized symbols into bss section"),
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cl::location(NoZerosInBSS),
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cl::init(false));
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cl::opt<llvm::Reloc::Model, true>
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DefRelocationModel(
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@ -323,22 +323,19 @@ void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
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O << Offset;
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if (isMemOp) {
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if (isExt) {
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if (Subtarget->isPICStyleGOT()) {
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if (Subtarget->isPICStyleGOT()) {
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if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
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O << "@GOT";
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} else if (Subtarget->isPICStyleRIPRel()) {
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O << "@GOTPCREL(%rip)";
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} else if (Subtarget->is64Bit() && !NotRIPRel)
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// Use rip when possible to reduce code size, except when
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// index or base register are also part of the address. e.g.
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// foo(%rip)(%rcx,%rax,4) is not legal
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O << "(%rip)";
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} else {
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if (Subtarget->is64Bit() && !NotRIPRel)
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O << "(%rip)";
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else if (Subtarget->isPICStyleGOT())
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else
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O << "@GOTOFF";
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}
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} else
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if (isExt && Subtarget->isPICStyleRIPRel())
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O << "@GOTPCREL(%rip)";
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else if (Subtarget->is64Bit() && !NotRIPRel)
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// Use rip when possible to reduce code size, except when
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// index or base register are also part of the address. e.g.
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// foo(%rip)(%rcx,%rax,4) is not legal
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O << "(%rip)";
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}
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return;
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@ -28,6 +28,7 @@
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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static X86FunctionInfo calculateFunctionInfo(const Function *F,
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@ -149,7 +150,10 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
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O << "\t.zerofill __DATA__, __common, " << name << ", "
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<< Size << ", " << Align;
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} else {
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SwitchToDataSection(TAI->getDataSection(), I);
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if (!NoZerosInBSS && TAI->getBSSSection())
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SwitchToDataSection(TAI->getBSSSection(), I);
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else
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SwitchToDataSection(TAI->getDataSection(), I);
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if (TAI->getLCOMMDirective() != NULL) {
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if (I->hasInternalLinkage()) {
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O << TAI->getLCOMMDirective() << name << "," << Size;
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@ -224,7 +228,10 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
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SwitchToDataSection(SectionName.c_str());
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} else {
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SwitchToDataSection(TAI->getDataSection(), I);
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if (C->isNullValue() && !NoZerosInBSS && TAI->getBSSSection())
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SwitchToDataSection(TAI->getBSSSection(), I);
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else
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SwitchToDataSection(TAI->getDataSection(), I);
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}
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break;
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@ -36,10 +36,14 @@ bool X86Subtarget::GVRequiresExtraLoad(const GlobalValue* GV,
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bool isDirectCall) const
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{
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if (TM.getRelocationModel() != Reloc::Static)
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if (isTargetDarwin() || isPICStyleGOT()) {
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if (isTargetDarwin()) {
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return (!isDirectCall &&
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(GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
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(GV->isExternal() && !GV->hasNotBeenReadFromBytecode())));
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} else if (isPICStyleGOT()) {
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// Extra load is needed for all non-statics.
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return (!isDirectCall &&
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(GV->isExternal() || !GV->hasInternalLinkage()));
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} else if (isTargetCygMing() || isTargetWindows()) {
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return (GV->hasDLLImportLinkage());
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}
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17
test/CodeGen/X86/test-pic-6.ll
Normal file
17
test/CodeGen/X86/test-pic-6.ll
Normal file
@ -0,0 +1,17 @@
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; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic &&
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; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep _GLOBAL_OFFSET_TABLE_ &&
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; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep piclabel | wc -l | grep 3 &&
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; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep GOT | wc -l | grep 3
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%ptr = global i32* null
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%dst = global i32 0
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%src = global i32 0
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define void %foo() {
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entry:
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store i32* %dst, i32** %ptr
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%tmp.s = load i32* %src
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store i32 %tmp.s, i32* %dst
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ret void
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}
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