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Started to clean up fctrl

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This commit is contained in:
David Harris 2023-03-30 12:57:14 -07:00
parent 3cb71125d1
commit b07c71ea41
1 changed files with 121 additions and 105 deletions
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22
src/fpu/fctrl.sv
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@ -90,27 +90,35 @@ module fctrl (
(Fmt2 == 2'b10 & `ZFH_SUPPORTED) | (Fmt2 == 2'b11 & `Q_SUPPORTED));
// decode the instruction
// ControlsD: FRegWrite_FWriteInt_FResSel_PostProcSel_FOpCtrl_FDivStart_IllegalFPUInstr_FCvtInt
// FRegWrite_FWriteInt_FResSel_PostProcSel_FOpCtrl_FDivStart_IllegalFPUInstr_FCvtInt
always_comb
if (STATUS_FS == 2'b00) // FPU instructions are illegal when FPU is disabled
ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0;
else if (OpD != 7'b0000111 & OpD != 7'b0100111 & ~SupportedFmt)
ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // for anything other than loads and stores, check for supported format
else begin
ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // default: illegal FPU instruction
ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // default: non-implemented instruction
/* verilator lint_off CASEINCOMPLETE */ // default value above has priority so no other default needed
case(OpD)
7'b0000111: case(Funct3D)
3'b010: ControlsD = `FCTRLW'b1_0_10_xx_0xx_0_0_0; // flw
3'b011: if (`D_SUPPORTED) ControlsD = `FCTRLW'b1_0_10_xx_0xx_0_0_0; // fld
else ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // fld not supported
3'b100: if (`Q_SUPPORTED) ControlsD = `FCTRLW'b1_0_10_xx_0xx_0_0_0; // flq
else ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // flq not supported
3'b001: if (`ZFH_SUPPORTED) ControlsD = `FCTRLW'b1_0_10_xx_0xx_0_0_0; // flh
else ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // flh not supported
default: ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // non-implemented instruction
endcase
7'b0100111: case(Funct3D)
3'b010: ControlsD = `FCTRLW'b0_0_10_xx_0xx_0_0_0; // fsw
3'b011: if (`D_SUPPORTED) ControlsD = `FCTRLW'b0_0_10_xx_0xx_0_0_0; // fsd
else ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // fsd not supported
3'b100: if (`Q_SUPPORTED) ControlsD = `FCTRLW'b0_0_10_xx_0xx_0_0_0; // fsq
else ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // fsq not supported
3'b001: if (`ZFH_SUPPORTED) ControlsD = `FCTRLW'b0_0_10_xx_0xx_0_0_0; // fsh
else ControlsD = `FCTRLW'b0_0_00_xx_0xx_0_1_0; // fsh not supported
default: ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // non-implemented instruction
endcase
7'b1000011: ControlsD = `FCTRLW'b1_0_01_10_000_0_0_0; // fmadd
7'b1000111: ControlsD = `FCTRLW'b1_0_01_10_001_0_0_0; // fmsub
@ -126,15 +134,18 @@ module fctrl (
3'b000: ControlsD = `FCTRLW'b1_0_00_xx_000_0_0_0; // fsgnj
3'b001: ControlsD = `FCTRLW'b1_0_00_xx_001_0_0_0; // fsgnjn
3'b010: ControlsD = `FCTRLW'b1_0_00_xx_010_0_0_0; // fsgnjx
default: ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // non-implemented instruction
endcase
7'b00101??: case(Funct3D)
3'b000: ControlsD = `FCTRLW'b1_0_00_xx_110_0_0_0; // fmin
3'b001: ControlsD = `FCTRLW'b1_0_00_xx_101_0_0_0; // fmax
default: ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // non-implemented instruction
endcase
7'b10100??: case(Funct3D)
3'b010: ControlsD = `FCTRLW'b0_1_00_xx_010_0_0_0; // feq
3'b001: ControlsD = `FCTRLW'b0_1_00_xx_001_0_0_0; // flt
3'b000: ControlsD = `FCTRLW'b0_1_00_xx_011_0_0_0; // fle
default: ControlsD = `FCTRLW'b0_0_00_xx_000__0_1_0; // non-implemented instruction
endcase
7'b11100??: if (Funct3D == 3'b001 & Rs2D == 5'b00000)
ControlsD = `FCTRLW'b0_1_10_xx_000_0_0_0; // fclass
@ -150,6 +161,8 @@ module fctrl (
ControlsD = `FCTRLW'b1_0_01_00_010_0_0_0; // fcvt.h.(s/d/q)
7'b0100011: if (Rs2D[4:2] == 3'b000 & SupportedFmt2 & Rs2D[1:0] != 2'b11)
ControlsD = `FCTRLW'b1_0_01_00_011_0_0_0; // fcvt.q.(s/h/d)
// *** other formats here
/* verilator lint_off CASEINCOMPLETE */
7'b1101000: case(Rs2D)
5'b00000: ControlsD = `FCTRLW'b1_0_01_00_101_0_0_0; // fcvt.s.w w->s
5'b00001: ControlsD = `FCTRLW'b1_0_01_00_100_0_0_0; // fcvt.s.wu wu->s
@ -198,10 +211,13 @@ module fctrl (
5'b00010: ControlsD = `FCTRLW'b0_1_01_00_011_0_0_1; // fcvt.l.q q->l
5'b00011: ControlsD = `FCTRLW'b0_1_01_00_010_0_0_1; // fcvt.lu.q q->lu
endcase
default: ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // non-implemented instruction
endcase
// default: ControlsD = `FCTRLW'b0_0_00_xx_000_0_1_0; // non-implemented instruction
endcase
/* verilator lint_off CASEINCOMPLETE */
end
/* verilator lint_off CASEINCOMPLETE */
// unswizzle control bits
assign #1 {FRegWriteD, FWriteIntD, FResSelD, PostProcSelD, OpCtrlD, FDivStartD, IllegalFPUInstrD, FCvtIntD} = ControlsD;