riscv/rocket-chip
1
0
Fork 0
Code Releases Activity

FPU : simplify pipeline register generation in FMA

Browse Source
This commit is contained in:
Henry Styles 2017-09-29 15:40:39 -07:00
parent 7a46715cbc
commit 5498468743
1 changed files with 17 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
src/main/scala/tile/FPU.scala
View File

@ -579,42 +579,27 @@ class MulAddRecFNPipe(latency: Int, expWidth: Int, sigWidth: Int) extends Module
val valid_stage0 = Wire(Bool()) val valid_stage0 = Wire(Bool())
val roundingMode_stage0 = Wire(UInt(width=3)) val roundingMode_stage0 = Wire(UInt(width=3))
val detectTininess_stage0 = Wire(UInt(width=1)) val detectTininess_stage0 = Wire(UInt(width=1))
if(latency>0) { val postmul_regs = if(latency>0) 1 else 0
mulAddRecFNToRaw_postMul.io.fromPreMul := RegEnable(mulAddRecFNToRaw_preMul.io.toPostMul,io.validin) mulAddRecFNToRaw_postMul.io.fromPreMul := Pipe(io.validin, mulAddRecFNToRaw_preMul.io.toPostMul, postmul_regs).bits
mulAddRecFNToRaw_postMul.io.mulAddResult := RegEnable(mulAddResult,io.validin) mulAddRecFNToRaw_postMul.io.mulAddResult := Pipe(io.validin, mulAddResult, postmul_regs).bits
mulAddRecFNToRaw_postMul.io.roundingMode := RegEnable(io.roundingMode,io.validin) mulAddRecFNToRaw_postMul.io.roundingMode := Pipe(io.validin, io.roundingMode, postmul_regs).bits
roundingMode_stage0 := RegEnable(io.roundingMode,io.validin) roundingMode_stage0 := Pipe(io.validin, io.roundingMode, postmul_regs).bits
detectTininess_stage0 := RegEnable(io.detectTininess,io.validin) detectTininess_stage0 := Pipe(io.validin, io.detectTininess, postmul_regs).bits
valid_stage0 := RegNext(io.validin,false.B) valid_stage0 := Pipe(io.validin, false.B, postmul_regs).valid
} else {
mulAddRecFNToRaw_postMul.io.fromPreMul := mulAddRecFNToRaw_preMul.io.toPostMul
mulAddRecFNToRaw_postMul.io.mulAddResult := mulAddResult
mulAddRecFNToRaw_postMul.io.roundingMode := io.roundingMode
roundingMode_stage0 := io.roundingMode
detectTininess_stage0 := io.detectTininess
valid_stage0 := io.validin
}
//------------------------------------------------------------------------ //------------------------------------------------------------------------
//------------------------------------------------------------------------ //------------------------------------------------------------------------
val roundRawFNToRecFN = Module(new hardfloat.RoundRawFNToRecFN(expWidth, sigWidth, 0)) val roundRawFNToRecFN = Module(new hardfloat.RoundRawFNToRecFN(expWidth, sigWidth, 0))
//
if(latency==2){
roundRawFNToRecFN.io.invalidExc := RegEnable(mulAddRecFNToRaw_postMul.io.invalidExc,valid_stage0)
roundRawFNToRecFN.io.in := RegEnable(mulAddRecFNToRaw_postMul.io.rawOut,valid_stage0)
roundRawFNToRecFN.io.roundingMode := RegEnable(roundingMode_stage0,valid_stage0)
roundRawFNToRecFN.io.detectTininess := RegEnable(detectTininess_stage0,valid_stage0)
io.validout := RegNext(valid_stage0, false.B)
} else {
roundRawFNToRecFN.io.invalidExc := mulAddRecFNToRaw_postMul.io.invalidExc
roundRawFNToRecFN.io.in := mulAddRecFNToRaw_postMul.io.rawOut
roundRawFNToRecFN.io.roundingMode := roundingMode_stage0
roundRawFNToRecFN.io.detectTininess := detectTininess_stage0
io.validout := valid_stage0
}
roundRawFNToRecFN.io.infiniteExc := Bool(false) val round_regs = if(latency==2) 1 else 0
roundRawFNToRecFN.io.invalidExc := Pipe(valid_stage0, mulAddRecFNToRaw_postMul.io.invalidExc, round_regs).bits
roundRawFNToRecFN.io.in := Pipe(valid_stage0, mulAddRecFNToRaw_postMul.io.rawOut, round_regs).bits
roundRawFNToRecFN.io.roundingMode := Pipe(valid_stage0, roundingMode_stage0, round_regs).bits
roundRawFNToRecFN.io.detectTininess := Pipe(valid_stage0, detectTininess_stage0, round_regs).bits
io.validout := Pipe(valid_stage0, false.B, round_regs).valid
roundRawFNToRecFN.io.infiniteExc := Bool(false)
io.out := roundRawFNToRecFN.io.out io.out := roundRawFNToRecFN.io.out
io.exceptionFlags := roundRawFNToRecFN.io.exceptionFlags io.exceptionFlags := roundRawFNToRecFN.io.exceptionFlags