#include "X86TargetAsmInfo.h"
#include "X86TargetMachine.h"
#include "X86Subtarget.h"
-
+#include "llvm/DerivedTypes.h"
+#include "llvm/InlineAsm.h"
+#include "llvm/Instructions.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/StringExtras.h"
using namespace llvm;
+// ASM variant to use.
+enum {
+ X86_ATT = 0,
+ X86_INTEL = 1
+};
+
+static const char* x86_asm_table[] = {"{si}", "S",
+ "{di}", "D",
+ "{ax}", "a",
+ "{cx}", "c",
+ "{memory}", "memory",
+ "{flags}", "",
+ "{dirflag}", "",
+ "{fpsr}", "",
+ "{cc}", "cc",
+ 0,0};
+
X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
// FIXME - Should be simplified.
-
+
+ AsmTransCBE = x86_asm_table;
+ AssemblerDialect = X86_ATT;
+
switch (Subtarget->TargetType) {
case X86Subtarget::isDarwin:
AlignmentIsInBytes = false;
InlineAsmEnd = "# InlineAsm End";
SetDirective = "\t.set";
UsedDirective = "\t.no_dead_strip\t";
+ WeakRefDirective = "\t.weak_reference\t";
+ HiddenDirective = "\t.private_extern\t";
NeedsSet = true;
DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
// bool HasDotLoc; // Defaults to false.
// HasDotFile - True if target asm supports .file directives.
// bool HasDotFile; // Defaults to false.
- PrivateGlobalPrefix = "."; // Prefix for private global symbols
+ PrivateGlobalPrefix = ".L";
+ WeakRefDirective = "\t.weak\t";
DwarfRequiresFrameSection = false;
DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
break;
case X86Subtarget::isCygwin:
+ case X86Subtarget::isMingw:
GlobalPrefix = "_";
+ LCOMMDirective = "\t.lcomm\t";
COMMDirectiveTakesAlignment = false;
HasDotTypeDotSizeDirective = false;
StaticCtorsSection = "\t.section .ctors,\"aw\"";
StaticDtorsSection = "\t.section .dtors,\"aw\"";
+ HiddenDirective = NULL;
+
+ // Set up DWARF directives
+ HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
+ PrivateGlobalPrefix = "L"; // Prefix for private global symbols
+ DwarfRequiresFrameSection = false;
+ DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
+ DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
+ DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
+ DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
+ DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
+ DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
+ DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
+ DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
+ DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
+ DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
+ DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
break;
+
case X86Subtarget::isWindows:
GlobalPrefix = "_";
HasDotTypeDotSizeDirective = false;
break;
+
default: break;
}
TextSection = "_text";
DataSection = "_data";
+ JumpTableDataSection = NULL;
SwitchToSectionDirective = "";
TextSectionStartSuffix = "\tsegment 'CODE'";
DataSectionStartSuffix = "\tsegment 'DATA'";
SectionEndDirectiveSuffix = "\tends\n";
+
+ AssemblerDialect = X86_INTEL;
}
}
+bool X86TargetAsmInfo::LowerToBSwap(CallInst *CI) const {
+ // FIXME: this should verify that we are targetting a 486 or better. If not,
+ // we will turn this bswap into something that will be lowered to logical ops
+ // instead of emitting the bswap asm. For now, we don't support 486 or lower
+ // so don't worry about this.
+
+ // Verify this is a simple bswap.
+ if (CI->getNumOperands() != 2 ||
+ CI->getType() != CI->getOperand(1)->getType() ||
+ !CI->getType()->isInteger())
+ return false;
+
+ const Type *Ty = CI->getType();
+ const char *IntName;
+ if (const IntegerType *ITy = dyn_cast<IntegerType>(Ty)) {
+ unsigned BitWidth = ITy->getBitWidth();
+ if (BitWidth == 16)
+ IntName = "llvm.bswap.i16";
+ else if (BitWidth == 32)
+ IntName = "llvm.bswap.i32";
+ else if (BitWidth == 64)
+ IntName = "llvm.bswap.i64";
+ else
+ return false;
+ } else
+ return false;
+
+ // Okay, we can do this xform, do so now.
+ Module *M = CI->getParent()->getParent()->getParent();
+ Constant *Int = M->getOrInsertFunction(IntName, Ty, Ty, (Type*)0);
+
+ Value *Op = CI->getOperand(1);
+ Op = new CallInst(Int, Op, CI->getName(), CI);
+
+ CI->replaceAllUsesWith(Op);
+ CI->eraseFromParent();
+ return true;
+}
+
+
+bool X86TargetAsmInfo::ExpandInlineAsm(CallInst *CI) const {
+ InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
+ std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
+
+ std::string AsmStr = IA->getAsmString();
+
+ // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
+ std::vector<std::string> AsmPieces;
+ SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
+
+ switch (AsmPieces.size()) {
+ default: return false;
+ case 1:
+ AsmStr = AsmPieces[0];
+ AsmPieces.clear();
+ SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
+
+ // bswap $0
+ if (AsmPieces.size() == 2 &&
+ AsmPieces[0] == "bswap" && AsmPieces[1] == "$0") {
+ // No need to check constraints, nothing other than the equivalent of
+ // "=r,0" would be valid here.
+ return LowerToBSwap(CI);
+ }
+ break;
+ case 3:
+ if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
+ Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
+ Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
+ // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
+ std::vector<std::string> Words;
+ SplitString(AsmPieces[0], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
+ Words.clear();
+ SplitString(AsmPieces[1], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
+ Words.clear();
+ SplitString(AsmPieces[2], Words, " \t,");
+ if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
+ Words[2] == "%edx") {
+ return LowerToBSwap(CI);
+ }
+ }
+ }
+ }
+ break;
+ }
+ return false;
+}
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