riscv/rocket-chip
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Bypass RAS push/pop

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This commit is contained in:
Andrew Waterman 2014-04-07 23:47:53 -07:00
parent f235fa0db6
commit 927287da34
1 changed files with 5 additions and 1 deletions
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6
rocket/src/main/scala/btb.scala
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@ -204,12 +204,16 @@ class BTB(implicit conf: BTBConfig) extends Module {
if (conf.nras > 0) { if (conf.nras > 0) {
val ras = new RAS val ras = new RAS
when (!ras.isEmpty && Mux1H(hits, useRAS)) { val doPeek = Mux1H(hits, useRAS)
when (!ras.isEmpty && doPeek) {
io.resp.bits.target := ras.peek io.resp.bits.target := ras.peek
} }
when (io.update.valid) { when (io.update.valid) {
when (io.update.bits.isCall) { when (io.update.bits.isCall) {
ras.push(io.update.bits.returnAddr) ras.push(io.update.bits.returnAddr)
when (doPeek) {
io.resp.bits.target := io.update.bits.returnAddr
}
}.elsewhen (io.update.bits.isReturn && io.update.bits.prediction.valid) { }.elsewhen (io.update.bits.isReturn && io.update.bits.prediction.valid) {
ras.pop ras.pop
} }