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3bde6fe0df
SSE transition penalty. The pass is enabled through the "x86-use-vzeroupper" llc command line option. This is only the first step (very naive and conservative one) to sketch out the idea, but proper DFA is coming next to allow smarter decisions. Comments and ideas now and in further commits will be very appreciated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138317 91177308-0d34-0410-b5e6-96231b3b80d8
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
//===-- X86.h - Top-level interface for X86 representation ------*- 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 contains the entry points for global functions defined in the x86
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// target library, as used by the LLVM JIT.
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//
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//===----------------------------------------------------------------------===//
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#ifndef TARGET_X86_H
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#define TARGET_X86_H
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#include "MCTargetDesc/X86BaseInfo.h"
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#include "MCTargetDesc/X86MCTargetDesc.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class FunctionPass;
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class JITCodeEmitter;
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class MachineCodeEmitter;
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class Target;
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class X86TargetMachine;
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/// createX86ISelDag - This pass converts a legalized DAG into a
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/// X86-specific DAG, ready for instruction scheduling.
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///
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FunctionPass *createX86ISelDag(X86TargetMachine &TM,
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CodeGenOpt::Level OptLevel);
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/// createGlobalBaseRegPass - This pass initializes a global base
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/// register for PIC on x86-32.
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FunctionPass* createGlobalBaseRegPass();
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/// createX86FloatingPointStackifierPass - This function returns a pass which
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/// converts floating point register references and pseudo instructions into
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/// floating point stack references and physical instructions.
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///
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FunctionPass *createX86FloatingPointStackifierPass();
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/// createSSEDomainFixPass - This pass twiddles SSE opcodes to prevent domain
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/// crossings.
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FunctionPass *createSSEDomainFixPass();
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/// createX86IssueVZeroUpperPass - This pass inserts AVX vzeroupper instructions
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/// before each call to avoid transition penalty between functions encoded with
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/// AVX and SSE.
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FunctionPass *createX86IssueVZeroUpperPass();
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/// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
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/// to the specified MCE object.
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FunctionPass *createX86JITCodeEmitterPass(X86TargetMachine &TM,
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JITCodeEmitter &JCE);
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/// createX86EmitCodeToMemory - Returns a pass that converts a register
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/// allocated function into raw machine code in a dynamically
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/// allocated chunk of memory.
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///
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FunctionPass *createEmitX86CodeToMemory();
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/// createX86MaxStackAlignmentHeuristicPass - This function returns a pass
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/// which determines whether the frame pointer register should be
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/// reserved in case dynamic stack alignment is later required.
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///
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FunctionPass *createX86MaxStackAlignmentHeuristicPass();
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} // End llvm namespace
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#endif
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