riscv/rocket-chip
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Remove four integer/FP converters

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This commit is contained in:
Andrew Waterman 2016-01-12 16:06:23 -08:00
parent 31d537c405
commit 7bf503a275
1 changed files with 17 additions and 39 deletions
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56
rocket/src/main/scala/fpu.scala
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@ -235,9 +235,7 @@ class FPToInt extends Module
when (io.in.valid) {
in := io.in.bits
when (io.in.bits.single && !io.in.bits.ldst && io.in.bits.cmd != FCMD_MV_XF &&
// need to also check toint because CVT_IF and SQRT overlap
!(io.in.bits.cmd === FCMD_CVT_IF && io.in.bits.toint)) {
when (io.in.bits.single && !io.in.bits.ldst && io.in.bits.cmd != FCMD_MV_XF) {
in.in1 := in1_upconvert
in.in2 := in2_upconvert
}
@ -258,23 +256,14 @@ class FPToInt extends Module
val dcmp_out = (~in.rm & Cat(dcmp.io.lt, dcmp.io.eq)).orR
val dcmp_exc = dcmp.io.exceptionFlags
val s2l = Module(new hardfloat.RecFNToIN(8, 24, 64))
val s2w = Module(new hardfloat.RecFNToIN(8, 24, 32))
s2l.io.in := in.in1
s2l.io.roundingMode := in.rm
s2l.io.signedOut := in.typ(0) ^ 1
s2w.io.in := in.in1
s2w.io.roundingMode := in.rm
s2w.io.signedOut := in.typ(0) ^ 1
val d2l = Module(new hardfloat.RecFNToIN(11, 53, 64))
val d2w = Module(new hardfloat.RecFNToIN(11, 53, 32))
d2l.io.in := in.in1
d2l.io.roundingMode := in.rm
d2l.io.signedOut := in.typ(0) ^ 1
d2l.io.signedOut := ~in.typ(0)
d2w.io.in := in.in1
d2w.io.roundingMode := in.rm
d2w.io.signedOut := in.typ(0) ^ 1
d2w.io.signedOut := ~in.typ(0)
io.out.bits.toint := Mux(in.rm(0), classify_out, unrec_out)
io.out.bits.store := unrec_out
@ -285,15 +274,9 @@ class FPToInt extends Module
io.out.bits.exc := dcmp_exc
}
when (in.cmd === FCMD_CVT_IF) {
when (in.single) {
io.out.bits.toint := Mux(in.typ(1), s2l.io.out, s2w.io.out.toSInt).toUInt
val sflags = Mux(in.typ(1), s2l.io.intExceptionFlags, s2w.io.intExceptionFlags)
io.out.bits.exc := Cat(sflags(2, 1).orR, UInt(0, 3), sflags(0))
} .otherwise {
io.out.bits.toint := Mux(in.typ(1), d2l.io.out, d2w.io.out.toSInt).toUInt
val dflags = Mux(in.typ(1), d2l.io.intExceptionFlags, d2w.io.intExceptionFlags)
io.out.bits.exc := Cat(dflags(2, 1).orR, UInt(0, 3), dflags(0))
}
io.out.bits.toint := Mux(in.typ(1), d2l.io.out.toSInt, d2w.io.out.toSInt).toUInt
val dflags = Mux(in.typ(1), d2l.io.intExceptionFlags, d2w.io.intExceptionFlags)
io.out.bits.exc := Cat(dflags(2, 1).orR, UInt(0, 3), dflags(0))
}
io.out.valid := valid
@ -317,31 +300,26 @@ class IntToFP(val latency: Int) extends Module
mux.data := Cat(SInt(-1, 32), hardfloat.recFNFromFN(8, 24, in.bits.in1))
}
val longValue =
Mux(in.bits.typ(1), in.bits.in1.toSInt,
Mux(in.bits.typ(0), in.bits.in1(31,0).zext, in.bits.in1(31,0).toSInt))
val l2s = Module(new hardfloat.INToRecFN(64, 8, 24))
val w2s = Module(new hardfloat.INToRecFN(32, 8, 24))
l2s.io.signedIn := in.bits.typ(0) ^ 1
l2s.io.in := in.bits.in1
l2s.io.signedIn := ~in.bits.typ(0)
l2s.io.in := longValue
l2s.io.roundingMode := in.bits.rm
w2s.io.signedIn := in.bits.typ(0) ^ 1
w2s.io.in := in.bits.in1
w2s.io.roundingMode := in.bits.rm
val l2d = Module(new hardfloat.INToRecFN(64, 11, 53))
val w2d = Module(new hardfloat.INToRecFN(32, 11, 53))
l2d.io.signedIn := in.bits.typ(0) ^ 1
l2d.io.in := in.bits.in1
l2d.io.signedIn := ~in.bits.typ(0)
l2d.io.in := longValue
l2d.io.roundingMode := in.bits.rm
w2d.io.signedIn := in.bits.typ(0) ^ 1
w2d.io.in := in.bits.in1
w2d.io.roundingMode := in.bits.rm
when (in.bits.cmd === FCMD_CVT_FI) {
when (in.bits.single) {
mux.data := Cat(SInt(-1, 32), Mux(in.bits.typ(1), l2s.io.out, w2s.io.out))
mux.exc := Mux(in.bits.typ(1), l2s.io.exceptionFlags, w2s.io.exceptionFlags)
mux.data := Cat(SInt(-1, 32), l2s.io.out)
mux.exc := l2s.io.exceptionFlags
}.otherwise {
mux.data := Mux(in.bits.typ(1), l2d.io.out, w2d.io.out)
mux.exc := Mux(in.bits.typ(1), l2d.io.exceptionFlags, w2d.io.exceptionFlags)
mux.data := l2d.io.out
mux.exc := l2d.io.exceptionFlags
}
}