riscv/rocket-chip
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Remove one gate from D$ ECC check

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The D$ corrects via writeback, so which word the error was in doesn't
matter, as the entire line is corrected.
This commit is contained in:
Andrew Waterman 2017-08-06 17:36:53 -07:00
parent 5030a8b15a
commit 7d94074b05
1 changed files with 4 additions and 1 deletions
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5
src/main/scala/rocket/DCache.scala
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@ -232,7 +232,10 @@ class DCacheModule(outer: DCache) extends HellaCacheModule(outer) {
val (s2_hit, s2_grow_param, s2_new_hit_state) = s2_hit_state.onAccess(s2_req.cmd)
val s2_data_decoded = decodeData(s2_data)
val s2_word_idx = s2_req.addr.extract(log2Up(rowBits/8)-1, log2Up(wordBytes))
val s2_data_error = needsRead(s2_req) && (s2_data_decoded.map(_.error).grouped(wordBits/eccBits).map(_.reduce(_||_)).toSeq)(s2_word_idx)
val s2_data_error = {
val word_errors = s2_data_decoded.map(_.error).grouped(wordBits/eccBits).map(_.reduce(_||_)).toSeq
needsRead(s2_req) && (if (usingDataScratchpad) word_errors(s2_word_idx) else word_errors.reduce(_||_))
}
val s2_data_corrected = (s2_data_decoded.map(_.corrected): Seq[UInt]).asUInt
val s2_data_uncorrected = (s2_data_decoded.map(_.uncorrected): Seq[UInt]).asUInt
val s2_valid_hit_pre_data_ecc = s2_valid_masked && s2_readwrite && !s2_meta_error && s2_hit