riscv/rocket-chip
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add fcvt.[s|d].[w|l][u]

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This commit is contained in:
Andrew Waterman 2012-02-13 02:01:26 -08:00
parent a4a9d2312c
commit b5a19a54a3
1 changed files with 25 additions and 10 deletions
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35
rocket/src/main/scala/fpu.scala
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@ -148,6 +148,14 @@ class rocketFPUDecoder extends Component
FSD -> List(Y,FCMD_STORE, N,N,Y,N,N,N,N,Y,N),
MXTF_S -> List(Y,FCMD_MXTF, Y,N,N,N,Y,Y,N,N,N),
MXTF_D -> List(Y,FCMD_MXTF, Y,N,N,N,N,Y,N,N,N),
FCVT_S_W -> List(Y,FCMD_CVT_FMT_W, Y,N,N,N,Y,Y,N,N,N),
FCVT_D_W -> List(Y,FCMD_CVT_FMT_W, Y,N,N,N,N,Y,N,N,N),
FCVT_S_WU-> List(Y,FCMD_CVT_FMT_WU,Y,N,N,N,Y,Y,N,N,N),
FCVT_D_WU-> List(Y,FCMD_CVT_FMT_WU,Y,N,N,N,N,Y,N,N,N),
FCVT_S_L -> List(Y,FCMD_CVT_FMT_L, Y,N,N,N,Y,Y,N,N,N),
FCVT_D_L -> List(Y,FCMD_CVT_FMT_L, Y,N,N,N,N,Y,N,N,N),
FCVT_S_LU-> List(Y,FCMD_CVT_FMT_LU,Y,N,N,N,Y,Y,N,N,N),
FCVT_D_LU-> List(Y,FCMD_CVT_FMT_LU,Y,N,N,N,N,Y,N,N,N),
MFTX_S -> List(Y,FCMD_MFTX, N,Y,N,N,Y,N,Y,N,N),
MFTX_D -> List(Y,FCMD_MFTX, N,Y,N,N,N,N,Y,N,N),
FCVT_W_S -> List(Y,FCMD_CVT_W_FMT, N,Y,N,N,Y,N,Y,N,N),
@ -296,11 +304,15 @@ class rocketIntFPUnit extends Component
rec_s.io.in := io.in
rec_d.io.in := io.in
val i2s = Bits(0)
val i2s_exc = Bits(0)
val i2s = new hardfloat.anyToRecodedFloat32
i2s.io.in := io.in
i2s.io.roundingMode := io.fsr >> UFix(5)
i2s.io.typeOp := ~io.cmd(1,0)
val i2d = Bits(0)
val i2d_exc = Bits(0)
val i2d = new hardfloat.anyToRecodedFloat64
i2d.io.in := io.in
i2d.io.roundingMode := io.fsr >> UFix(5)
i2d.io.typeOp := ~io.cmd(1,0)
// output muxing
val (out_s, exc_s) = (Wire() { Bits() }, Wire() { Bits() })
@ -312,10 +324,10 @@ class rocketIntFPUnit extends Component
when (io.cmd === FCMD_CVT_FMT_W || io.cmd === FCMD_CVT_FMT_WU ||
io.cmd === FCMD_CVT_FMT_L || io.cmd === FCMD_CVT_FMT_LU) {
out_s := i2s
exc_s := i2s_exc
out_d := i2d
exc_d := i2d_exc
out_s := i2s.io.out
exc_s := i2s.io.exceptionFlags
out_d := i2d.io.out
exc_d := i2d.io.exceptionFlags
}
when (io.cmd === FCMD_MTFSR || io.cmd === FCMD_MFFSR) {
out_s := Cat(out_s(32,FSR_WIDTH), io.in(FSR_WIDTH-1,0))
@ -427,11 +439,14 @@ class rocketFPU extends Component
val retire_toint = Reg(!io.ctrl.killm && fp_toint_val, resetVal = Bool(false))
val retire_toint_exc = Reg(fpiu.io.exc)
val retire_fromint = Reg(!io.ctrl.killm && fp_fromint_val, resetVal = Bool(false))
val retire_fromint_exc = Reg(ifpu.io.exc)
val retire_fromint_wdata = Reg(ifpu.io.out)
val retire_fromint_waddr = Reg(fp_waddr)
when (retire_toint) {
fsr_exc := fsr_exc | retire_toint_exc
when (retire_toint || retire_fromint) {
fsr_exc := fsr_exc |
Fill(fsr_exc.getWidth, retire_toint) & retire_toint_exc |
Fill(fsr_exc.getWidth, retire_fromint) & retire_fromint_exc
}
when (retire_toint && retire_fromint) { // MTFSR
fsr_exc := retire_fromint_wdata(4,0)