diff options
| -rw-r--r-- | utils/TableGen/SubtargetEmitter.cpp | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/utils/TableGen/SubtargetEmitter.cpp b/utils/TableGen/SubtargetEmitter.cpp index fc8d00d..93eef86 100644 --- a/utils/TableGen/SubtargetEmitter.cpp +++ b/utils/TableGen/SubtargetEmitter.cpp @@ -893,7 +893,20 @@ void SubtargetEmitter::GenSchedClassTables(const CodeGenProcModel &ProcModel, WPREntry.Cycles = Cycles[PRIdx]; else WPREntry.Cycles = 1; - WriteProcResources.push_back(WPREntry); + // If this resource is already used in this sequence, add the current + // entry's cycles so that the same resource appears to be used + // serially, rather than multiple parallel uses. This is important for + // in-order machine where the resource consumption is a hazard. + unsigned WPRIdx = 0, WPREnd = WriteProcResources.size(); + for( ; WPRIdx != WPREnd; ++WPRIdx) { + if (WriteProcResources[WPRIdx].ProcResourceIdx + == WPREntry.ProcResourceIdx) { + WriteProcResources[WPRIdx].Cycles += WPREntry.Cycles; + break; + } + } + if (WPRIdx == WPREnd) + WriteProcResources.push_back(WPREntry); } } WriteLatencies.push_back(WLEntry); |