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47857812e2
Three changes: 1. Convert signed integer types to signless versions. 2. Implement the @sext and @zext parameter attributes. Previously the type of an function parameter was used to determine whether it should be sign extended or zero extended before the call. This information is now communicated via the function type's parameter attributes. 3. The interface to LowerCallTo had to be changed in order to accommodate the parameter attribute information. Although it would have been convenient to pass in the FunctionType itself, there isn't always one present in the caller. Consequently, a signedness indication for the result type and for each parameter was provided for in the interface to this method. All implementations were changed to make the adjustment necessary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32788 91177308-0d34-0410-b5e6-96231b3b80d8
252 lines
9.7 KiB
C++
252 lines
9.7 KiB
C++
//===-- X86TargetAsmInfo.cpp - X86 asm properties ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by James M. Laskey and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations of the X86TargetAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#include "X86TargetAsmInfo.h"
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#include "X86TargetMachine.h"
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#include "X86Subtarget.h"
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#include "llvm/InlineAsm.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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static const char* x86_asm_table[] = {"{si}", "S",
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"{di}", "D",
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"{ax}", "a",
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"{cx}", "c",
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"{memory}", "memory",
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"{flags}", "",
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"{dirflag}", "",
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"{fpsr}", "",
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"{cc}", "cc",
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0,0};
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X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
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const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
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// FIXME - Should be simplified.
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AsmTransCBE = x86_asm_table;
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switch (Subtarget->TargetType) {
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case X86Subtarget::isDarwin:
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AlignmentIsInBytes = false;
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GlobalPrefix = "_";
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if (!Subtarget->is64Bit())
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Data64bitsDirective = 0; // we can't emit a 64-bit unit
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ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
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PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
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ConstantPoolSection = "\t.const\n";
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JumpTableDataSection = "\t.const\n";
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CStringSection = "\t.cstring";
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FourByteConstantSection = "\t.literal4\n";
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EightByteConstantSection = "\t.literal8\n";
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if (Subtarget->is64Bit())
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SixteenByteConstantSection = "\t.literal16\n";
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LCOMMDirective = "\t.lcomm\t";
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COMMDirectiveTakesAlignment = false;
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HasDotTypeDotSizeDirective = false;
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StaticCtorsSection = ".mod_init_func";
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StaticDtorsSection = ".mod_term_func";
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InlineAsmStart = "# InlineAsm Start";
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InlineAsmEnd = "# InlineAsm End";
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SetDirective = "\t.set";
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UsedDirective = "\t.no_dead_strip\t";
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WeakRefDirective = "\t.weak_reference\t";
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NeedsSet = true;
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DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
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DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
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DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
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DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
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DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
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DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
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DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
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DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
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DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
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DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
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DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
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break;
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case X86Subtarget::isELF:
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// Set up DWARF directives
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HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
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// bool HasLEB128; // Defaults to false.
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// hasDotLoc - True if target asm supports .loc directives.
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// bool HasDotLoc; // Defaults to false.
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// HasDotFile - True if target asm supports .file directives.
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// bool HasDotFile; // Defaults to false.
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PrivateGlobalPrefix = "."; // Prefix for private global symbols
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WeakRefDirective = "\t.weak\t";
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DwarfRequiresFrameSection = false;
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DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
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DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
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DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
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DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
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DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
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DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
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DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
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DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
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DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
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DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
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DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
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break;
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case X86Subtarget::isCygwin:
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GlobalPrefix = "_";
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COMMDirectiveTakesAlignment = false;
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HasDotTypeDotSizeDirective = false;
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StaticCtorsSection = "\t.section .ctors,\"aw\"";
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StaticDtorsSection = "\t.section .dtors,\"aw\"";
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// Set up DWARF directives
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HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
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PrivateGlobalPrefix = "L"; // Prefix for private global symbols
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DwarfRequiresFrameSection = false;
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DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
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DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
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DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
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DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
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DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
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DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
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DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
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DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
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DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
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DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
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DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
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break;
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break;
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case X86Subtarget::isWindows:
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GlobalPrefix = "_";
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HasDotTypeDotSizeDirective = false;
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break;
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default: break;
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}
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if (Subtarget->isFlavorIntel()) {
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GlobalPrefix = "_";
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CommentString = ";";
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PrivateGlobalPrefix = "$";
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AlignDirective = "\talign\t";
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ZeroDirective = "\tdb\t";
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ZeroDirectiveSuffix = " dup(0)";
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AsciiDirective = "\tdb\t";
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AscizDirective = 0;
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Data8bitsDirective = "\tdb\t";
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Data16bitsDirective = "\tdw\t";
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Data32bitsDirective = "\tdd\t";
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Data64bitsDirective = "\tdq\t";
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HasDotTypeDotSizeDirective = false;
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TextSection = "_text";
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DataSection = "_data";
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JumpTableDataSection = NULL;
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SwitchToSectionDirective = "";
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TextSectionStartSuffix = "\tsegment 'CODE'";
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DataSectionStartSuffix = "\tsegment 'DATA'";
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SectionEndDirectiveSuffix = "\tends\n";
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}
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}
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bool X86TargetAsmInfo::LowerToBSwap(CallInst *CI) const {
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// FIXME: this should verify that we are targetting a 486 or better. If not,
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// we will turn this bswap into something that will be lowered to logical ops
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// instead of emitting the bswap asm. For now, we don't support 486 or lower
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// so don't worry about this.
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// Verify this is a simple bswap.
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if (CI->getNumOperands() != 2 ||
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CI->getType() != CI->getOperand(1)->getType() ||
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!CI->getType()->isInteger())
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return false;
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const Type *Ty = CI->getType();
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const char *IntName;
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switch (Ty->getTypeID()) {
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default: return false;
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case Type::Int16TyID: IntName = "llvm.bswap.i16"; break;
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case Type::Int32TyID: IntName = "llvm.bswap.i32"; break;
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case Type::Int64TyID: IntName = "llvm.bswap.i64"; break;
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}
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// Okay, we can do this xform, do so now.
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Module *M = CI->getParent()->getParent()->getParent();
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Function *Int = M->getOrInsertFunction(IntName, Ty, Ty, (Type*)0);
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Value *Op = CI->getOperand(1);
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if (CI->getOperand(1)->getType() != Ty)
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Op = new BitCastInst(Op, Ty, Op->getName(), CI);
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Op = new CallInst(Int, Op, CI->getName(), CI);
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if (Op->getType() != CI->getType())
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Op = new BitCastInst(Op, CI->getType(), Op->getName(), CI);
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CI->replaceAllUsesWith(Op);
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CI->eraseFromParent();
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return true;
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}
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bool X86TargetAsmInfo::ExpandInlineAsm(CallInst *CI) const {
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InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
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std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
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std::string AsmStr = IA->getAsmString();
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// TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
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std::vector<std::string> AsmPieces;
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SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
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switch (AsmPieces.size()) {
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default: return false;
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case 1:
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AsmStr = AsmPieces[0];
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AsmPieces.clear();
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SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
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// bswap $0
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if (AsmPieces.size() == 2 &&
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AsmPieces[0] == "bswap" && AsmPieces[1] == "$0") {
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// No need to check constraints, nothing other than the equivalent of
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// "=r,0" would be valid here.
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return LowerToBSwap(CI);
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}
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break;
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case 3:
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if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
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Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
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Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
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// bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
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std::vector<std::string> Words;
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SplitString(AsmPieces[0], Words, " \t");
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if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
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Words.clear();
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SplitString(AsmPieces[1], Words, " \t");
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if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
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Words.clear();
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SplitString(AsmPieces[2], Words, " \t,");
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if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
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Words[2] == "%edx") {
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return LowerToBSwap(CI);
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}
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}
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}
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}
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break;
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}
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return false;
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}
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