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critical path optimization - fpga fmax @4c = ~212 mhz

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This commit is contained in:
Blaise Tine
2020-12-26 03:28:32 -08:00
parent d5c6b9b4d9
commit b459192dec
11 changed files with 216 additions and 169 deletions
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33
hw/rtl/VX_decode.v
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@@ -307,21 +307,20 @@ module VX_decode #(
///////////////////////////////////////////////////////////////////////////
assign decode_if.valid = ifetch_rsp_if.valid
&& (decode_if.ex_type != `EX_NOP); // skip noop
assign decode_if.valid = ifetch_rsp_if.valid;
assign decode_if.wid = ifetch_rsp_if.wid;
assign decode_if.tmask = ifetch_rsp_if.tmask;
assign decode_if.PC = ifetch_rsp_if.PC;
assign decode_if.ex_type = is_lsu ? `EX_LSU :
is_csr ? `EX_CSR :
is_mul ? `EX_MUL :
is_fpu ? `EX_FPU :
is_gpu ? `EX_GPU :
is_br ? `EX_ALU :
(is_rtype || is_itype || is_lui || is_auipc) ? `EX_ALU :
`EX_NOP;
is_csr ? `EX_CSR :
is_mul ? `EX_MUL :
is_fpu ? `EX_FPU :
is_gpu ? `EX_GPU :
is_br ? `EX_ALU :
(is_rtype || is_itype || is_lui || is_auipc) ? `EX_ALU :
`EX_NOP;
assign decode_if.op_type = is_lsu ? `OP_BITS'(lsu_op) :
is_csr ? `OP_BITS'(csr_op) :
@@ -367,17 +366,17 @@ module VX_decode #(
///////////////////////////////////////////////////////////////////////////
wire decode_fire = decode_if.valid && decode_if.ready;
wire decode_fire_unqual = ifetch_rsp_if.valid && decode_if.ready;
assign join_if.valid = decode_fire && is_gpu && (gpu_op == `GPU_JOIN);
assign join_if.valid = decode_fire_unqual && is_gpu && (gpu_op == `GPU_JOIN);
assign join_if.wid = ifetch_rsp_if.wid;
assign wstall_if.valid = decode_fire && (is_btype
|| is_jal
|| is_jalr
|| (is_gpu && (gpu_op == `GPU_TMC
|| gpu_op == `GPU_SPLIT
|| gpu_op == `GPU_BAR)));
assign wstall_if.valid = decode_fire_unqual && (is_btype
|| is_jal
|| is_jalr
|| (is_gpu && (gpu_op == `GPU_TMC
|| gpu_op == `GPU_SPLIT
|| gpu_op == `GPU_BAR)));
assign wstall_if.wid = ifetch_rsp_if.wid;
///////////////////////////////////////////////////////////////////////////