diff options
Diffstat (limited to 'include/llvm/Target/TargetInstrItineraries.h')
| -rw-r--r-- | include/llvm/Target/TargetInstrItineraries.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/llvm/Target/TargetInstrItineraries.h b/include/llvm/Target/TargetInstrItineraries.h index 420fa94..3dfa8bc 100644 --- a/include/llvm/Target/TargetInstrItineraries.h +++ b/include/llvm/Target/TargetInstrItineraries.h @@ -47,10 +47,24 @@ namespace llvm { /// indicate that the instruction requires multiple stages at the /// same time. /// +/// FU reservation can be of two different kinds: +/// - FUs which instruction actually requires +/// - FUs which instruction just reserves. Reserved unit is not available for +/// execution of other instruction. However, several instructions can reserve +/// the same unit several times. +/// Such two types of units reservation is used to model instruction domain +/// change stalls, FUs using the same resource (e.g. same register file), etc. + struct InstrStage { + enum ReservationKinds { + Required = 0, + Reserved = 1 + }; + unsigned Cycles_; ///< Length of stage in machine cycles unsigned Units_; ///< Choice of functional units - int NextCycles_; ///< Number of machine cycles to next stage + int NextCycles_; ///< Number of machine cycles to next stage + ReservationKinds Kind_; ///< Kind of the FU reservation /// getCycles - returns the number of cycles the stage is occupied unsigned getCycles() const { @@ -62,6 +76,10 @@ struct InstrStage { return Units_; } + ReservationKinds getReservationKind() const { + return Kind_; + } + /// getNextCycles - returns the number of cycles from the start of /// this stage to the start of the next stage in the itinerary unsigned getNextCycles() const { |
