riscv/rocket-chip
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add fcvt.[w|l][u].[s|d], f[eq|lt|le].[s|d]

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This commit is contained in:
Andrew Waterman 2012-02-13 01:30:01 -08:00
parent 069037ff3a
commit a4a9d2312c
2 changed files with 93 additions and 37 deletions
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24
rocket/src/main/scala/ctrl.scala
View File

@ -211,8 +211,30 @@ class rocketCtrl extends Component
MFTX_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), MFTX_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
MFTX_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), MFTX_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_W_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_W_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_WU_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_WU_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_L_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_L_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_LU_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_LU_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FEQ_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FEQ_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FLT_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FLT_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FLE_S-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FLE_D-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
MXTF_S-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), MXTF_S-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
MXTF_D-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), MXTF_D-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_S_W-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_D_W-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_S_WU-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_D_WU-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_S_L-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_D_L-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_S_LU-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FCVT_D_LU-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
MFFSR-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), MFFSR-> List(FPU_Y,N,BR_N, REN_N,REN_N,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
MTFSR-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), MTFSR-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_X, DW_X, FN_X, M_N,M_X, MT_X, N,MUL_X, N,DIV_X, WEN_Y,WA_X, WB_X, REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
FLW-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_ITYPE,DW_XPR,FN_ADD, M_Y,M_XRD, MT_W, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_ALU,REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N), FLW-> List(FPU_Y,N,BR_N, REN_N,REN_Y,A2_ITYPE,DW_XPR,FN_ADD, M_Y,M_XRD, MT_W, N,MUL_X, N,DIV_X, WEN_N,WA_X, WB_ALU,REN_N,WEN_N,I_X ,SYNC_N,N,N,N,N),
@ -463,7 +485,7 @@ class rocketCtrl extends Component
mem_reg_flush_inst := ex_reg_flush_inst; mem_reg_flush_inst := ex_reg_flush_inst;
mem_reg_xcpt_ma_inst := ex_reg_xcpt_ma_inst; mem_reg_xcpt_ma_inst := ex_reg_xcpt_ma_inst;
mem_reg_xcpt_itlb := ex_reg_xcpt_itlb; mem_reg_xcpt_itlb := ex_reg_xcpt_itlb;
mem_reg_xcpt_illegal := ex_reg_xcpt_illegal; mem_reg_xcpt_illegal := ex_reg_xcpt_illegal || ex_reg_fp_val && io.fpu.illegal_rm;
mem_reg_xcpt_privileged := ex_reg_xcpt_privileged; mem_reg_xcpt_privileged := ex_reg_xcpt_privileged;
mem_reg_xcpt_fpu := ex_reg_fp_val && !io.dpath.status(SR_EF).toBool; mem_reg_xcpt_fpu := ex_reg_fp_val && !io.dpath.status(SR_EF).toBool;
mem_reg_xcpt_vec := ex_reg_vec_val && !io.dpath.status(SR_EV).toBool; mem_reg_xcpt_vec := ex_reg_vec_val && !io.dpath.status(SR_EV).toBool;

84
rocket/src/main/scala/fpu.scala
View File

@ -150,6 +150,20 @@ class rocketFPUDecoder extends Component
MXTF_D -> List(Y,FCMD_MXTF, Y,N,N,N,N,Y,N,N,N), MXTF_D -> List(Y,FCMD_MXTF, 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_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), 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),
FCVT_W_D -> List(Y,FCMD_CVT_W_FMT, N,Y,N,N,N,N,Y,N,N),
FCVT_WU_S-> List(Y,FCMD_CVT_WU_FMT,N,Y,N,N,Y,N,Y,N,N),
FCVT_WU_D-> List(Y,FCMD_CVT_WU_FMT,N,Y,N,N,N,N,Y,N,N),
FCVT_L_S -> List(Y,FCMD_CVT_L_FMT, N,Y,N,N,Y,N,Y,N,N),
FCVT_L_D -> List(Y,FCMD_CVT_L_FMT, N,Y,N,N,N,N,Y,N,N),
FCVT_LU_S-> List(Y,FCMD_CVT_LU_FMT,N,Y,N,N,Y,N,Y,N,N),
FCVT_LU_D-> List(Y,FCMD_CVT_LU_FMT,N,Y,N,N,N,N,Y,N,N),
FEQ_S -> List(Y,FCMD_EQ, N,Y,Y,N,Y,N,Y,N,N),
FEQ_D -> List(Y,FCMD_EQ, N,Y,Y,N,N,N,Y,N,N),
FLT_S -> List(Y,FCMD_LT, N,Y,Y,N,Y,N,Y,N,N),
FLT_D -> List(Y,FCMD_LT, N,Y,Y,N,N,N,Y,N,N),
FLE_S -> List(Y,FCMD_LE, N,Y,Y,N,Y,N,Y,N,N),
FLE_D -> List(Y,FCMD_LE, N,Y,Y,N,N,N,Y,N,N),
MTFSR -> List(Y,FCMD_MTFSR, N,N,N,N,Y,Y,Y,N,Y), MTFSR -> List(Y,FCMD_MTFSR, N,N,N,N,Y,Y,Y,N,Y),
MFFSR -> List(Y,FCMD_MFFSR, N,N,N,N,Y,N,Y,N,Y) MFFSR -> List(Y,FCMD_MFFSR, N,N,N,N,Y,N,Y,N,Y)
)) ))
@ -184,6 +198,7 @@ class ioDpathFPU extends Bundle {
class ioCtrlFPU extends Bundle { class ioCtrlFPU extends Bundle {
val valid = Bool(OUTPUT) val valid = Bool(OUTPUT)
val nack = Bool(INPUT) val nack = Bool(INPUT)
val illegal_rm = Bool(INPUT)
val killx = Bool(OUTPUT) val killx = Bool(OUTPUT)
val killm = Bool(OUTPUT) val killm = Bool(OUTPUT)
val dec = new rocketFPUCtrlSigs().asInput val dec = new rocketFPUCtrlSigs().asInput
@ -195,7 +210,8 @@ class rocketFPIntUnit extends Component
val single = Bool(INPUT) val single = Bool(INPUT)
val cmd = Bits(FCMD_WIDTH, INPUT) val cmd = Bits(FCMD_WIDTH, INPUT)
val fsr = Bits(FSR_WIDTH, INPUT) val fsr = Bits(FSR_WIDTH, INPUT)
val in = Bits(65, INPUT) val in1 = Bits(65, INPUT)
val in2 = Bits(65, INPUT)
val store_data = Bits(64, OUTPUT) val store_data = Bits(64, OUTPUT)
val toint_data = Bits(64, OUTPUT) val toint_data = Bits(64, OUTPUT)
val exc = Bits(5, OUTPUT) val exc = Bits(5, OUTPUT)
@ -203,22 +219,32 @@ class rocketFPIntUnit extends Component
val unrec_s = new hardfloat.recodedFloat32ToFloat32 val unrec_s = new hardfloat.recodedFloat32ToFloat32
val unrec_d = new hardfloat.recodedFloat64ToFloat64 val unrec_d = new hardfloat.recodedFloat64ToFloat64
unrec_s.io.in := io.in unrec_s.io.in := io.in1
unrec_d.io.in := io.in unrec_d.io.in := io.in1
io.store_data := Mux(io.single, Cat(unrec_s.io.out, unrec_s.io.out), unrec_d.io.out) io.store_data := Mux(io.single, Cat(unrec_s.io.out, unrec_s.io.out), unrec_d.io.out)
val scmp = Bool(false) val scmp = new hardfloat.recodedFloat32Compare
val scmp_exc = Bits(0) scmp.io.a := io.in1
scmp.io.b := io.in2
val scmp_out = (io.cmd(1,0) & Cat(scmp.io.a_lt_b, scmp.io.a_eq_b)).orR
val scmp_exc = (io.cmd(1,0) & Cat(scmp.io.a_lt_b_invalid, scmp.io.a_eq_b_invalid)).orR << UFix(4)
val s2i = UFix(0) val s2i = new hardfloat.recodedFloat32ToAny
val s2i_exc = Bits(0) s2i.io.in := io.in1
s2i.io.roundingMode := io.fsr >> UFix(5)
s2i.io.typeOp := ~io.cmd(1,0)
val dcmp = Bool(false) val dcmp = new hardfloat.recodedFloat64Compare
val dcmp_exc = Bits(0) dcmp.io.a := io.in1
dcmp.io.b := io.in2
val dcmp_out = (io.cmd(1,0) & Cat(dcmp.io.a_lt_b, dcmp.io.a_eq_b)).orR
val dcmp_exc = (io.cmd(1,0) & Cat(dcmp.io.a_lt_b_invalid, dcmp.io.a_eq_b_invalid)).orR << UFix(4)
val d2i = UFix(0) val d2i = new hardfloat.recodedFloat64ToAny
val d2i_exc = Bits(0) d2i.io.in := io.in1
d2i.io.roundingMode := io.fsr >> UFix(5)
d2i.io.typeOp := ~io.cmd(1,0)
// output muxing // output muxing
val (out_s, exc_s) = (Wire() { Bits() }, Wire() { Bits() }) val (out_s, exc_s) = (Wire() { Bits() }, Wire() { Bits() })
@ -232,21 +258,21 @@ class rocketFPIntUnit extends Component
out_s := io.fsr out_s := io.fsr
} }
when (io.cmd === FCMD_CVT_W_FMT || io.cmd === FCMD_CVT_WU_FMT) { when (io.cmd === FCMD_CVT_W_FMT || io.cmd === FCMD_CVT_WU_FMT) {
out_s := Cat(Fill(32, s2i(31)), s2i(31,0)) out_s := Cat(Fill(32, s2i.io.out(31)), s2i.io.out(31,0))
exc_s := s2i_exc exc_s := s2i.io.exceptionFlags
out_d := Cat(Fill(32, d2i(31)), d2i(31,0)) out_d := Cat(Fill(32, d2i.io.out(31)), d2i.io.out(31,0))
exc_d := d2i_exc exc_d := d2i.io.exceptionFlags
} }
when (io.cmd === FCMD_CVT_L_FMT || io.cmd === FCMD_CVT_LU_FMT) { when (io.cmd === FCMD_CVT_L_FMT || io.cmd === FCMD_CVT_LU_FMT) {
out_s := s2i out_s := s2i.io.out
exc_s := s2i_exc exc_s := s2i.io.exceptionFlags
out_d := d2i out_d := d2i.io.out
exc_d := d2i_exc exc_d := d2i.io.exceptionFlags
} }
when (io.cmd === FCMD_EQ || io.cmd === FCMD_LT || io.cmd === FCMD_LE) { when (io.cmd === FCMD_EQ || io.cmd === FCMD_LT || io.cmd === FCMD_LE) {
out_s := scmp out_s := scmp_out
exc_s := scmp_exc exc_s := scmp_exc
out_d := dcmp out_d := dcmp_out
exc_d := dcmp_exc exc_d := dcmp_exc
} }
@ -352,21 +378,25 @@ class rocketFPU extends Component
val fp_fromint_data = Reg() { Bits() } val fp_fromint_data = Reg() { Bits() }
val fp_toint_val = Reg(resetVal = Bool(false)) val fp_toint_val = Reg(resetVal = Bool(false))
val fp_toint_data = Reg() { Bits() } val fp_toint_data = Reg() { Bits() }
val fp_cmp_data = Reg() { Bits() }
val fp_toint_single = Reg() { Bool() } val fp_toint_single = Reg() { Bool() }
val fp_toint_cmd = Reg() { Bits() } val fp_toint_cmd = Reg() { Bits() }
val fp_waddr = Reg() { Bits() } val fp_waddr = Reg() { Bits() }
fp_fromint_val := Bool(false) fp_fromint_val := Bool(false)
fp_toint_val := Bool(false) fp_toint_val := Bool(false)
when (reg_valid && !io.ctrl.killx) { when (reg_valid) {
fp_waddr := reg_inst(31,27) fp_waddr := reg_inst(31,27)
when (ctrl.fromint) { when (ctrl.fromint) {
fp_fromint_val := Bool(true) fp_fromint_val := !io.ctrl.killx
fp_fromint_data := io.dpath.fromint_data fp_fromint_data := io.dpath.fromint_data
} }
when (ctrl.toint) { when (ctrl.toint) {
fp_toint_val := Bool(true) fp_toint_val := !io.ctrl.killx
fp_toint_data := ex_rs1 fp_toint_data := ex_rs1
when (ctrl.ren2) {
fp_cmp_data := ex_rs2
}
} }
when (ctrl.store) { when (ctrl.store) {
fp_toint_data := ex_rs2 fp_toint_data := ex_rs2
@ -382,7 +412,8 @@ class rocketFPU extends Component
fpiu.io.single := ctrl.single fpiu.io.single := ctrl.single
fpiu.io.cmd := ctrl.cmd fpiu.io.cmd := ctrl.cmd
fpiu.io.fsr := Cat(fsr_rm, fsr_exc) fpiu.io.fsr := Cat(fsr_rm, fsr_exc)
fpiu.io.in := fp_toint_data fpiu.io.in1 := fp_toint_data
fpiu.io.in2 := fp_cmp_data
io.dpath.store_data := fpiu.io.store_data io.dpath.store_data := fpiu.io.store_data
io.dpath.toint_data := fpiu.io.toint_data io.dpath.toint_data := fpiu.io.toint_data
@ -390,6 +421,7 @@ class rocketFPU extends Component
val ifpu = new rocketIntFPUnit val ifpu = new rocketIntFPUnit
ifpu.io.single := ctrl.single ifpu.io.single := ctrl.single
ifpu.io.cmd := ctrl.cmd ifpu.io.cmd := ctrl.cmd
ifpu.io.fsr := Cat(fsr_rm, fsr_exc)
ifpu.io.in := fp_fromint_data ifpu.io.in := fp_fromint_data
val retire_toint = Reg(!io.ctrl.killm && fp_toint_val, resetVal = Bool(false)) val retire_toint = Reg(!io.ctrl.killm && fp_toint_val, resetVal = Bool(false))
@ -415,4 +447,6 @@ class rocketFPU extends Component
val write_port_busy = Bool(false) val write_port_busy = Bool(false)
io.ctrl.nack := fsr_busy || units_busy || write_port_busy io.ctrl.nack := fsr_busy || units_busy || write_port_busy
io.ctrl.dec <> fp_decoder.io.sigs io.ctrl.dec <> fp_decoder.io.sigs
// we don't currently support round-max-magnitude (rm=4)
io.ctrl.illegal_rm := Mux(reg_inst(11,9) === Bits(7), fsr_rm(2), reg_inst(11))
} }