forked from OSchip/llvm-project
64 lines
2.2 KiB
TableGen
64 lines
2.2 KiB
TableGen
//===-- X86SchedPredicates.td - X86 Scheduling Predicates --*- tablegen -*-===//
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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 defines scheduling predicate definitions that are common to
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// all X86 subtargets.
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//
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//===----------------------------------------------------------------------===//
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// A predicate used to identify dependency-breaking instructions that clear the
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// content of the destination register. Note that this predicate only checks if
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// input registers are the same. This predicate doesn't make any assumptions on
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// the expected instruction opcodes, because different processors may implement
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// different zero-idioms.
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def ZeroIdiomPredicate : CheckSameRegOperand<1, 2>;
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// A predicate used to identify VPERM that have bits 3 and 7 of their mask set.
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// On some processors, these VPERM instructions are zero-idioms.
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def ZeroIdiomVPERMPredicate : CheckAll<[
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ZeroIdiomPredicate,
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CheckImmOperand<3, 0x88>
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]>;
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// A predicate used to check if a LEA instruction uses all three source
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// operands: base, index, and offset.
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def IsThreeOperandsLEAPredicate: CheckAll<[
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// isRegOperand(Base)
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CheckIsRegOperand<1>,
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CheckNot<CheckInvalidRegOperand<1>>,
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// isRegOperand(Index)
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CheckIsRegOperand<3>,
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CheckNot<CheckInvalidRegOperand<3>>,
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// hasLEAOffset(Offset)
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CheckAny<[
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CheckAll<[
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CheckIsImmOperand<4>,
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CheckNot<CheckZeroOperand<4>>
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]>,
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CheckNonPortable<"MI.getOperand(4).isGlobal()">
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]>
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]>;
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def LEACases : MCOpcodeSwitchCase<
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[LEA32r, LEA64r, LEA64_32r, LEA16r],
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MCReturnStatement<IsThreeOperandsLEAPredicate>
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>;
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// Used to generate the body of a TII member function.
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def IsThreeOperandsLEABody :
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MCOpcodeSwitchStatement<[LEACases], MCReturnStatement<FalsePred>>;
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// This predicate evaluates to true only if the input machine instruction is a
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// 3-operands LEA. Tablegen automatically generates a new method for it in
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// X86GenInstrInfo.
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def IsThreeOperandsLEAFn :
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TIIPredicate<"isThreeOperandsLEA", IsThreeOperandsLEABody>;
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