It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86TargetAsmInfo.cpp b/lib/Target/X86/X86TargetAsmInfo.cpp
new file mode 100644
index 0000000..4bb854e
--- /dev/null
+++ b/lib/Target/X86/X86TargetAsmInfo.cpp
@@ -0,0 +1,280 @@
+//===-- X86TargetAsmInfo.cpp - X86 asm properties ---------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by James M. Laskey and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declarations of the X86TargetAsmInfo properties.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86TargetAsmInfo.h"
+#include "X86TargetMachine.h"
+#include "X86Subtarget.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/InlineAsm.h"
+#include "llvm/Instructions.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/StringExtras.h"
+using namespace llvm;
+
+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;
+
+ switch (Subtarget->TargetType) {
+ case X86Subtarget::isDarwin:
+ AlignmentIsInBytes = false;
+ GlobalPrefix = "_";
+ if (!Subtarget->is64Bit())
+ Data64bitsDirective = 0; // we can't emit a 64-bit unit
+ ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
+ PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
+ BSSSection = 0; // no BSS section.
+ ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
+ ConstantPoolSection = "\t.const\n";
+ JumpTableDataSection = "\t.const\n";
+ CStringSection = "\t.cstring";
+ FourByteConstantSection = "\t.literal4\n";
+ EightByteConstantSection = "\t.literal8\n";
+ if (Subtarget->is64Bit())
+ SixteenByteConstantSection = "\t.literal16\n";
+ ReadOnlySection = "\t.const\n";
+ LCOMMDirective = "\t.lcomm\t";
+ COMMDirectiveTakesAlignment = false;
+ HasDotTypeDotSizeDirective = false;
+ if (TM.getRelocationModel() == Reloc::Static) {
+ StaticCtorsSection = ".constructor";
+ StaticDtorsSection = ".destructor";
+ } else {
+ StaticCtorsSection = ".mod_init_func";
+ StaticDtorsSection = ".mod_term_func";
+ }
+ InlineAsmStart = "# InlineAsm Start";
+ InlineAsmEnd = "# InlineAsm End";
+ SetDirective = "\t.set";
+ UsedDirective = "\t.no_dead_strip\t";
+ WeakRefDirective = "\t.weak_reference\t";
+ HiddenDirective = "\t.private_extern\t";
+
+ // In non-PIC modes, emit a special label before jump tables so that the
+ // linker can perform more accurate dead code stripping.
+ if (TM.getRelocationModel() != Reloc::PIC_) {
+ // Emit a local label that is preserved until the linker runs.
+ JumpTableSpecialLabelPrefix = "l";
+ }
+
+ SupportsDebugInformation = true;
+ NeedsSet = true;
+ DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
+ DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
+ DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
+ DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
+ DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
+ DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
+ DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
+ DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
+ DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
+ DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
+ DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
+ break;
+
+ case X86Subtarget::isELF:
+ ReadOnlySection = "\t.section\t.rodata";
+ FourByteConstantSection = "\t.section\t.rodata.cst4,\"aM\",@progbits,4";
+ EightByteConstantSection = "\t.section\t.rodata.cst8,\"aM\",@progbits,8";
+ SixteenByteConstantSection = "\t.section\t.rodata.cst16,\"aM\",@progbits,16";
+ CStringSection = "\t.section\t.rodata.str1.1,\"aMS\",@progbits,1";
+ PrivateGlobalPrefix = ".L";
+ WeakRefDirective = "\t.weak\t";
+ SetDirective = "\t.set\t";
+ PCSymbol = ".";
+
+ // Set up DWARF directives
+ HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
+ AbsoluteDebugSectionOffsets = true;
+ AbsoluteEHSectionOffsets = false;
+ SupportsDebugInformation = true;
+ DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
+ DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
+ DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
+ DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
+ DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
+ DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
+ DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
+ DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
+ DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
+ DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
+ DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
+
+ if (!Subtarget->is64Bit())
+ SupportsExceptionHandling = true;
+ DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
+ DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@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;
+ PrivateGlobalPrefix = "L"; // Prefix for private global symbols
+ WeakRefDirective = "\t.weak\t";
+ SetDirective = "\t.set\t";
+
+ // Set up DWARF directives
+ HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
+ AbsoluteDebugSectionOffsets = true;
+ AbsoluteEHSectionOffsets = false;
+ SupportsDebugInformation = true;
+ DwarfSectionOffsetDirective = "\t.secrel32\t";
+ 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;
+ }
+
+ if (Subtarget->isFlavorIntel()) {
+ GlobalPrefix = "_";
+ CommentString = ";";
+
+ PrivateGlobalPrefix = "$";
+ AlignDirective = "\talign\t";
+ ZeroDirective = "\tdb\t";
+ ZeroDirectiveSuffix = " dup(0)";
+ AsciiDirective = "\tdb\t";
+ AscizDirective = 0;
+ Data8bitsDirective = "\tdb\t";
+ Data16bitsDirective = "\tdw\t";
+ Data32bitsDirective = "\tdd\t";
+ Data64bitsDirective = "\tdq\t";
+ HasDotTypeDotSizeDirective = false;
+
+ TextSection = "_text";
+ DataSection = "_data";
+ JumpTableDataSection = NULL;
+ SwitchToSectionDirective = "";
+ TextSectionStartSuffix = "\tsegment 'CODE'";
+ DataSectionStartSuffix = "\tsegment 'DATA'";
+ SectionEndDirectiveSuffix = "\tends\n";
+ }
+
+ AssemblerDialect = Subtarget->getAsmFlavor();
+}
+
+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 IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+
+ // Okay, we can do this xform, do so now.
+ const Type *Tys[] = { Ty, Ty };
+ Module *M = CI->getParent()->getParent()->getParent();
+ Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 2);
+
+ 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;
+}