riscv/rocket-chip
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Roll back use of UIntToOH1 (#946)

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These appear to be equivalent, but the old one seems to fail in Vivado and
this one seems to pass.  This is not yet conclusive.
This commit is contained in:
Andrew Waterman 2017-08-09 18:39:47 -07:00 committed by GitHub
parent 0b8b136831
commit 0a591c5b5b
1 changed files with 2 additions and 2 deletions
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src/main/scala/rocket/IBuf.scala
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@ -77,8 +77,8 @@ class IBuf(implicit p: Parameters) extends CoreModule {
val icMask = (~UInt(0, fetchWidth*coreInstBits) << (nBufValid << log2Ceil(coreInstBits)))(fetchWidth*coreInstBits-1,0)
val inst = icData & icMask | buf.data & ~icMask
val valid = UIntToOH1(nValid, fetchWidth)
val bufMask = UIntToOH1(nBufValid, fetchWidth)
val valid = (UIntToOH(nValid) - 1)(fetchWidth-1, 0)
val bufMask = UIntToOH(nBufValid) - 1
val xcpt = (0 until bufMask.getWidth).map(i => Mux(bufMask(i), buf.xcpt, io.imem.bits.xcpt))
val buf_replay = Mux(buf.replay, bufMask, UInt(0))
val ic_replay = buf_replay | Mux(io.imem.bits.replay, valid & ~bufMask, UInt(0))