diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Support/PatternMatch.h | 110 |
1 files changed, 99 insertions, 11 deletions
diff --git a/include/llvm/Support/PatternMatch.h b/include/llvm/Support/PatternMatch.h index 9fbe4349b3..a83a068462 100644 --- a/include/llvm/Support/PatternMatch.h +++ b/include/llvm/Support/PatternMatch.h @@ -830,7 +830,7 @@ inline brc_match<Cond_t> m_Br(const Cond_t &C, BasicBlock *&T, BasicBlock *&F) { // Matchers for max/min idioms, eg: "select (sgt x, y), x, y" -> smax(x,y). // -template<typename LHS_t, typename RHS_t, typename Pred_t> +template<typename CmpInst_t, typename LHS_t, typename RHS_t, typename Pred_t> struct MaxMin_match { LHS_t L; RHS_t R; @@ -844,7 +844,7 @@ struct MaxMin_match { SelectInst *SI = dyn_cast<SelectInst>(V); if (!SI) return false; - ICmpInst *Cmp = dyn_cast<ICmpInst>(SI->getCondition()); + CmpInst_t *Cmp = dyn_cast<CmpInst_t>(SI->getCondition()); if (!Cmp) return false; // At this point we have a select conditioned on a comparison. Check that @@ -856,7 +856,7 @@ struct MaxMin_match { if ((TrueVal != LHS || FalseVal != RHS) && (TrueVal != RHS || FalseVal != LHS)) return false; - ICmpInst::Predicate Pred = LHS == TrueVal ? + typename CmpInst_t::Predicate Pred = LHS == TrueVal ? Cmp->getPredicate() : Cmp->getSwappedPredicate(); // Does "(x pred y) ? x : y" represent the desired max/min operation? if (!Pred_t::match(Pred)) @@ -894,28 +894,116 @@ struct umin_pred_ty { } }; +/// ofmax_pred_ty - Helper class for identifying ordered max predicates. +struct ofmax_pred_ty { + static bool match(FCmpInst::Predicate Pred) { + return Pred == CmpInst::FCMP_OGT || Pred == CmpInst::FCMP_OGE; + } +}; + +/// ofmin_pred_ty - Helper class for identifying ordered min predicates. +struct ofmin_pred_ty { + static bool match(FCmpInst::Predicate Pred) { + return Pred == CmpInst::FCMP_OLT || Pred == CmpInst::FCMP_OLE; + } +}; + +/// ufmax_pred_ty - Helper class for identifying unordered max predicates. +struct ufmax_pred_ty { + static bool match(FCmpInst::Predicate Pred) { + return Pred == CmpInst::FCMP_UGT || Pred == CmpInst::FCMP_UGE; + } +}; + +/// ufmin_pred_ty - Helper class for identifying unordered min predicates. +struct ufmin_pred_ty { + static bool match(FCmpInst::Predicate Pred) { + return Pred == CmpInst::FCMP_ULT || Pred == CmpInst::FCMP_ULE; + } +}; + template<typename LHS, typename RHS> -inline MaxMin_match<LHS, RHS, smax_pred_ty> +inline MaxMin_match<ICmpInst, LHS, RHS, smax_pred_ty> m_SMax(const LHS &L, const RHS &R) { - return MaxMin_match<LHS, RHS, smax_pred_ty>(L, R); + return MaxMin_match<ICmpInst, LHS, RHS, smax_pred_ty>(L, R); } template<typename LHS, typename RHS> -inline MaxMin_match<LHS, RHS, smin_pred_ty> +inline MaxMin_match<ICmpInst, LHS, RHS, smin_pred_ty> m_SMin(const LHS &L, const RHS &R) { - return MaxMin_match<LHS, RHS, smin_pred_ty>(L, R); + return MaxMin_match<ICmpInst, LHS, RHS, smin_pred_ty>(L, R); } template<typename LHS, typename RHS> -inline MaxMin_match<LHS, RHS, umax_pred_ty> +inline MaxMin_match<ICmpInst, LHS, RHS, umax_pred_ty> m_UMax(const LHS &L, const RHS &R) { - return MaxMin_match<LHS, RHS, umax_pred_ty>(L, R); + return MaxMin_match<ICmpInst, LHS, RHS, umax_pred_ty>(L, R); } template<typename LHS, typename RHS> -inline MaxMin_match<LHS, RHS, umin_pred_ty> +inline MaxMin_match<ICmpInst, LHS, RHS, umin_pred_ty> m_UMin(const LHS &L, const RHS &R) { - return MaxMin_match<LHS, RHS, umin_pred_ty>(L, R); + return MaxMin_match<ICmpInst, LHS, RHS, umin_pred_ty>(L, R); +} + +/// \brief Match an 'ordered' floating point maximum attribute. +/// Floating point has one special value 'NaN'. Therefore, there is no total +/// order. However, if we can ignore the 'NaN' value (for example, because of a +/// 'no-nans-float-math' flag) a combination of a fcmp and select has 'maximum' +/// semantics. In the presence of 'NaN' we have to preserve the original +/// select(fcmp(ogt/ge, L, R), L, R) semantics matched by this predicate. +/// +/// max(L, R) iff L and R are not NaN +/// m_OrdFMax(L, R) = R iff L or R are NaN +template<typename LHS, typename RHS> +inline MaxMin_match<FCmpInst, LHS, RHS, ofmax_pred_ty> +m_OrdFMax(const LHS &L, const RHS &R) { + return MaxMin_match<FCmpInst, LHS, RHS, ofmax_pred_ty>(L, R); +} + +/// \brief Match an 'ordered' floating point minimum attribute. +/// Floating point has one special value 'NaN'. Therefore, there is no total +/// order. However, if we can ignore the 'NaN' value (for example, because of a +/// 'no-nans-float-math' flag) a combination of a fcmp and select has 'minimum' +/// semantics. In the presence of 'NaN' we have to preserve the original +/// select(fcmp(olt/le, L, R), L, R) semantics matched by this predicate. +/// +/// max(L, R) iff L and R are not NaN +/// m_OrdFMin(L, R) = R iff L or R are NaN +template<typename LHS, typename RHS> +inline MaxMin_match<FCmpInst, LHS, RHS, ofmin_pred_ty> +m_OrdFMin(const LHS &L, const RHS &R) { + return MaxMin_match<FCmpInst, LHS, RHS, ofmin_pred_ty>(L, R); +} + +/// \brief Match an 'unordered' floating point maximum attribute. +/// Floating point has one special value 'NaN'. Therefore, there is no total +/// order. However, if we can ignore the 'NaN' value (for example, because of a +/// 'no-nans-float-math' flag) a combination of a fcmp and select has 'maximum' +/// semantics. In the presence of 'NaN' we have to preserve the original +/// select(fcmp(ugt/ge, L, R), L, R) semantics matched by this predicate. +/// +/// max(L, R) iff L and R are not NaN +/// m_UnordFMin(L, R) = L iff L or R are NaN +template<typename LHS, typename RHS> +inline MaxMin_match<FCmpInst, LHS, RHS, ufmax_pred_ty> +m_UnordFMax(const LHS &L, const RHS &R) { + return MaxMin_match<FCmpInst, LHS, RHS, ufmax_pred_ty>(L, R); +} + +/// \brief Match an 'unordered' floating point minimum attribute. +/// Floating point has one special value 'NaN'. Therefore, there is no total +/// order. However, if we can ignore the 'NaN' value (for example, because of a +/// 'no-nans-float-math' flag) a combination of a fcmp and select has 'minimum' +/// semantics. In the presence of 'NaN' we have to preserve the original +/// select(fcmp(ult/le, L, R), L, R) semantics matched by this predicate. +/// +/// max(L, R) iff L and R are not NaN +/// m_UnordFMin(L, R) = L iff L or R are NaN +template<typename LHS, typename RHS> +inline MaxMin_match<FCmpInst, LHS, RHS, ufmin_pred_ty> +m_UnordFMin(const LHS &L, const RHS &R) { + return MaxMin_match<FCmpInst, LHS, RHS, ufmin_pred_ty>(L, R); } template<typename Opnd_t> |