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Cleanup spill logic.

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This commit is contained in:
Ross Thompson 2022-12-30 14:59:51 -06:00
parent fdd7b68501
commit a538d4316f
1 changed files with 3 additions and 9 deletions
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12
pipelined/src/ifu/spillsupport.sv
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@ -52,7 +52,7 @@ module spillsupport #(parameter CACHE_ENABLED)
localparam integer SPILLTHRESHOLD = CACHE_ENABLED ? `ICACHE_LINELENINBITS/32 : 1; localparam integer SPILLTHRESHOLD = CACHE_ENABLED ? `ICACHE_LINELENINBITS/32 : 1;
logic [`XLEN-1:0] PCPlus2F; logic [`XLEN-1:0] PCPlus2F;
logic TakeSpillF; logic TakeSpillF;
logic SpillF, PossibleSpillF, FirstHalfCompressedF; logic FirstHalfCompressedF;
logic SelSpillF, SpillSaveF; logic SelSpillF, SpillSaveF;
logic [15:0] InstrFirstHalfF; logic [15:0] InstrFirstHalfF;
typedef enum logic [1:0] {STATE_READY, STATE_SPILL} statetype; typedef enum logic [1:0] {STATE_READY, STATE_SPILL} statetype;
@ -65,9 +65,7 @@ module spillsupport #(parameter CACHE_ENABLED)
// select between PCF and PCF+2 // select between PCF and PCF+2
mux2 #(`XLEN) pcspillmux(.d0(PCF), .d1(PCPlus2F), .s(SelSpillF), .y(PCFSpill)); mux2 #(`XLEN) pcspillmux(.d0(PCF), .d1(PCPlus2F), .s(SelSpillF), .y(PCFSpill));
assign PossibleSpillF = &PCF[$clog2(SPILLTHRESHOLD)+1:1]; assign TakeSpillF = &PCF[$clog2(SPILLTHRESHOLD)+1:1] & ~FirstHalfCompressedF & ~IFUCacheBusStallD & ~ITLBMissF;
assign SpillF = PossibleSpillF & ~FirstHalfCompressedF & ~IFUCacheBusStallD;
assign TakeSpillF = SpillF & ~ITLBMissF;
always_ff @(posedge clk) always_ff @(posedge clk)
if (reset | Flush) CurrState <= #1 STATE_READY; if (reset | Flush) CurrState <= #1 STATE_READY;
@ -88,11 +86,7 @@ module spillsupport #(parameter CACHE_ENABLED)
(CurrState == STATE_SPILL & IFUCacheBusStallD); (CurrState == STATE_SPILL & IFUCacheBusStallD);
assign SpillSaveF = (CurrState == STATE_READY) & TakeSpillF; assign SpillSaveF = (CurrState == STATE_READY) & TakeSpillF;
flopenr #(16) SpillInstrReg(.clk(clk), flopenrc #(16) SpillInstrReg(clk, reset, Flush, SpillSaveF, InstrRawF[15:0], InstrFirstHalfF);
.en(SpillSaveF & ~Flush),
.reset(reset),
.d(InstrRawF[15:0]),
.q(InstrFirstHalfF));
mux2 #(32) postspillmux(.d0(InstrRawF), .d1({InstrRawF[15:0], InstrFirstHalfF}), .s(SelSpillF), mux2 #(32) postspillmux(.d0(InstrRawF), .d1({InstrRawF[15:0], InstrFirstHalfF}), .s(SelSpillF),
.y(PostSpillInstrRawF)); .y(PostSpillInstrRawF));