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Rgiunti/fix indexed instr #61

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0864a6f
indexed load fixed
Nov 5, 2025
d18fccb
vsuxei test added, updated test file CMakeLists.txt, TC number explic…
Nov 6, 2025
f41a77b
updated vsuxei test (EEW data < EEW idxs)
Nov 6, 2025
ae8f27f
unuseful comments deleted
Jan 20, 2026
7fa78e8
added license header
Jan 20, 2026
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13 changes: 10 additions & 3 deletions hw/ip/spatz/src/spatz_vlsu.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -434,16 +434,23 @@ module spatz_vlsu
maxew_t idx_offset;
assign idx_offset = mem_idx_counter_q[port];

logic signed [2:0] data_index_width_diff;
logic [idx_width(N_FU*ELENB)-1:0] word_index;

always_comb begin
stride = mem_is_strided ? mem_spatz_req.rs2 >> mem_spatz_req.vtype.vsew : 'd1;

if (mem_is_indexed) begin
// What is the relationship between data and index width?
automatic logic [1:0] data_index_width_diff = int'(mem_spatz_req.vtype.vsew) - int'(mem_spatz_req.op_mem.ew);
data_index_width_diff = int'(mem_spatz_req.vtype.vsew) - int'(mem_spatz_req.op_mem.ew);

// Pointer to index
automatic logic [idx_width(N_FU*ELENB)-1:0] word_index = (port << (MAXEW - data_index_width_diff)) + (maxew_t'(idx_offset << data_index_width_diff) >> data_index_width_diff) + (maxew_t'(idx_offset >> (MAXEW - data_index_width_diff)) << (MAXEW - data_index_width_diff)) * NrMemPorts;

if (data_index_width_diff >= 0) begin
word_index = (port << (MAXEW - data_index_width_diff)) + (maxew_t'(idx_offset << data_index_width_diff) >> data_index_width_diff) + (maxew_t'(idx_offset >> (MAXEW - data_index_width_diff)) << (MAXEW - data_index_width_diff)) * NrMemPorts;
end else begin
word_index = (port >> (MAXEW + data_index_width_diff)) + (maxew_t'(idx_offset >> -data_index_width_diff) << -data_index_width_diff) + (maxew_t'(idx_offset << (MAXEW + data_index_width_diff)) >> (MAXEW + data_index_width_diff)) * NrMemPorts;
end

// Index
unique case (mem_spatz_req.op_mem.ew)
EW_8 : offset = $signed(vrf_rdata_i[1][8 * word_index +: 8]);
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