forked from OSchip/llvm-project
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//===-- PPCPredicates.h - PPC Branch Predicate Information ------*- 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 describes the PowerPC branch predicates.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCPREDICATES_H
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#define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCPREDICATES_H
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// GCC #defines PPC on Linux but we use it as our namespace name
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#undef PPC
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// Generated files will use "namespace PPC". To avoid symbol clash,
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// undefine PPC here. PPC may be predefined on some hosts.
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#undef PPC
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namespace llvm {
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namespace PPC {
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/// Predicate - These are "(BI << 5) | BO" for various predicates.
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enum Predicate {
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PRED_LT = (0 << 5) | 12,
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PRED_LE = (1 << 5) | 4,
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PRED_EQ = (2 << 5) | 12,
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PRED_GE = (0 << 5) | 4,
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PRED_GT = (1 << 5) | 12,
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PRED_NE = (2 << 5) | 4,
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PRED_UN = (3 << 5) | 12,
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PRED_NU = (3 << 5) | 4,
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PRED_LT_MINUS = (0 << 5) | 14,
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PRED_LE_MINUS = (1 << 5) | 6,
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PRED_EQ_MINUS = (2 << 5) | 14,
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PRED_GE_MINUS = (0 << 5) | 6,
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PRED_GT_MINUS = (1 << 5) | 14,
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PRED_NE_MINUS = (2 << 5) | 6,
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PRED_UN_MINUS = (3 << 5) | 14,
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PRED_NU_MINUS = (3 << 5) | 6,
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PRED_LT_PLUS = (0 << 5) | 15,
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PRED_LE_PLUS = (1 << 5) | 7,
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PRED_EQ_PLUS = (2 << 5) | 15,
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PRED_GE_PLUS = (0 << 5) | 7,
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PRED_GT_PLUS = (1 << 5) | 15,
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PRED_NE_PLUS = (2 << 5) | 7,
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PRED_UN_PLUS = (3 << 5) | 15,
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PRED_NU_PLUS = (3 << 5) | 7,
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// When dealing with individual condition-register bits, we have simple set
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// and unset predicates.
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PRED_BIT_SET = 1024,
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PRED_BIT_UNSET = 1025
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};
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// Bit for branch taken (plus) or not-taken (minus) hint
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enum BranchHintBit {
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BR_NO_HINT = 0x0,
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BR_NONTAKEN_HINT = 0x2,
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BR_TAKEN_HINT = 0x3,
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BR_HINT_MASK = 0X3
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};
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/// Invert the specified predicate. != -> ==, < -> >=.
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Predicate InvertPredicate(Predicate Opcode);
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/// Assume the condition register is set by MI(a,b), return the predicate if
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/// we modify the instructions such that condition register is set by MI(b,a).
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Predicate getSwappedPredicate(Predicate Opcode);
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}
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}
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#endif
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