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decoupled load/store commits

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This commit is contained in:
Blaise Tine
2020-12-03 15:08:48 -08:00
parent c3ec4c9e90
commit fb60d0af87
9 changed files with 93 additions and 89 deletions
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38
hw/rtl/VX_lsu_unit.v
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@@ -16,7 +16,8 @@ module VX_lsu_unit #(
VX_lsu_req_if lsu_req_if,
// outputs
VX_commit_if lsu_commit_if
VX_commit_if ld_commit_if,
VX_commit_if st_commit_if
);
wire [`NUM_THREADS-1:0] req_tmask;
wire req_rw;
@@ -135,7 +136,7 @@ module VX_lsu_unit #(
end
end
wire stall_out = ~lsu_commit_if.ready && lsu_commit_if.valid;
wire stall_out = ~ld_commit_if.ready && ld_commit_if.valid;
wire store_stall = valid_in && req_rw && stall_out;
// Core Request
@@ -168,18 +169,23 @@ module VX_lsu_unit #(
end
end
wire is_store_req = valid_in && ~lsuq_full && req_rw && dcache_req_if.ready;
// send store commit
wire is_store_rsp = valid_in && ~lsuq_full && req_rw && dcache_req_if.ready;
assign st_commit_if.valid = is_store_rsp;
assign st_commit_if.wid = req_wid;
assign st_commit_if.tmask = req_tmask;
assign st_commit_if.PC = req_pc;
assign st_commit_if.rd = 0;
assign st_commit_if.wb = 0;
assign st_commit_if.data = 0;
`UNUSED_VAR (st_commit_if.ready)
// send load commit
wire is_load_rsp = (| dcache_rsp_if.valid);
wire mem_rsp_stall = is_load_rsp && is_store_req; // arbitration prioritizes stores
wire arb_valid = is_store_req || is_load_rsp;
wire [`NW_BITS-1:0] arb_wid = is_store_req ? req_wid : rsp_wid;
wire [`NUM_THREADS-1:0] arb_tmask = is_store_req ? req_tmask : dcache_rsp_if.valid;
wire [31:0] arb_PC = is_store_req ? req_pc : rsp_pc;
wire [`NR_BITS-1:0] arb_rd = is_store_req ? 0 : rsp_rd;
wire arb_wb = is_store_req ? 0 : rsp_wb;
VX_generic_register #(
.N(1 + `NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1 + (`NUM_THREADS * 32)),
.R(1)
@@ -188,12 +194,12 @@ module VX_lsu_unit #(
.reset (reset),
.stall (stall_out),
.flush (1'b0),
.in ({arb_valid, arb_wid, arb_tmask, arb_PC, arb_rd, arb_wb, rsp_data}),
.out ({lsu_commit_if.valid, lsu_commit_if.wid, lsu_commit_if.tmask, lsu_commit_if.PC, lsu_commit_if.rd, lsu_commit_if.wb, lsu_commit_if.data})
.in ({is_load_rsp, rsp_wid, dcache_rsp_if.valid, rsp_pc, rsp_rd, rsp_wb, rsp_data}),
.out ({ld_commit_if.valid, ld_commit_if.wid, ld_commit_if.tmask, ld_commit_if.PC, ld_commit_if.rd, ld_commit_if.wb, ld_commit_if.data})
);
// Can accept new cache response?
assign dcache_rsp_if.ready = ~(stall_out || mem_rsp_stall);
assign dcache_rsp_if.ready = ~stall_out;
// scope registration
`SCOPE_ASSIGN (dcache_req_fire, dcache_req_if.valid & {`NUM_THREADS{dcache_req_if.ready}});