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set wctl.is_cond_neg to 0 to avoid a x defined tmask in sfu in 4 stat… #421

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set wctl.is_cond_neg to 0 to avoid a x defined tmask in sfu in 4 stat… #421

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7 changes: 7 additions & 0 deletions hw/rtl/core/VX_decode.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -601,6 +601,13 @@ module VX_decode import
end
3'h3: begin // JOIN
op_type = INST_OP_BITS'(INST_SFU_JOIN);
// While the value of is_cond_neg has no impact on join result
// it enters into the logic equation for the then_mask.
// If it is left at x, in 4-state simulation, the then_mask
// is assigned x which creates problems.
// Assigning is_cond_neg to 0 adds no logic and ensures
// the then_mask is not x.
op_args.wctl.is_cond_neg = 1'b0;
`USED_IREG (rs1);
end
3'h4: begin // BAR
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