102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
//=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the ARM specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ARMSUBTARGET_H
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#define ARMSUBTARGET_H
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#include "llvm/Target/TargetSubtarget.h"
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#include <string>
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namespace llvm {
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class Module;
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class ARMSubtarget : public TargetSubtarget {
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protected:
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enum ARMArchEnum {
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V4T, V5T, V5TE, V6
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};
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/// ARMArchVersion - ARM architecture vecrsion: V4T (base), V5T, V5TE,
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/// and V6.
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ARMArchEnum ARMArchVersion;
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/// HasVFP2 - True if the processor supports Vector Floating Point (VFP) V2
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/// instructions.
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bool HasVFP2;
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/// IsThumb - True if we are in thumb mode, false if in ARM mode.
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bool IsThumb;
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/// UseThumbBacktraces - True if we use thumb style backtraces.
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bool UseThumbBacktraces;
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/// IsR9Reserved - True if R9 is a not available as general purpose register.
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bool IsR9Reserved;
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/// stackAlignment - The minimum alignment known to hold of the stack frame on
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/// entry to the function and which must be maintained by every function.
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unsigned stackAlignment;
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public:
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enum {
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isELF, isDarwin
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} TargetType;
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enum {
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ARM_ABI_APCS,
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ARM_ABI_AAPCS // ARM EABI
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} TargetABI;
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/// This constructor initializes the data members to match that
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/// of the specified module.
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///
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ARMSubtarget(const Module &M, const std::string &FS, bool thumb);
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/// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
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/// that still makes it profitable to inline the call.
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unsigned getMaxInlineSizeThreshold() const {
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// FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
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// Change this once Thumb ldmia / stmia support is added.
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return isThumb() ? 0 : 64;
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}
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/// ParseSubtargetFeatures - Parses features string setting specified
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/// subtarget options. Definition of function is auto generated by tblgen.
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void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
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bool hasV4TOps() const { return ARMArchVersion >= V4T; }
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bool hasV5TOps() const { return ARMArchVersion >= V5T; }
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bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
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bool hasV6Ops() const { return ARMArchVersion >= V6; }
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bool hasVFP2() const { return HasVFP2; }
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bool isTargetDarwin() const { return TargetType == isDarwin; }
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bool isTargetELF() const { return TargetType == isELF; }
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bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
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bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
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bool isThumb() const { return IsThumb; }
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bool useThumbBacktraces() const { return UseThumbBacktraces; }
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bool isR9Reserved() const { return IsR9Reserved; }
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/// getStackAlignment - Returns the minimum alignment known to hold of the
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/// stack frame on entry to the function and which must be maintained by every
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/// function for this subtarget.
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unsigned getStackAlignment() const { return stackAlignment; }
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};
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} // End llvm namespace
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#endif // ARMSUBTARGET_H
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