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[rtl] Fix decode values for B Operand mux select

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With data-independent timing enabled and BranchTargetALU configured,
branches will stall for a cycle causing an illegal value to be decoded
for the B Operand. No functional impact of this, but an assertion fires
so we might as well tie it off properly.

Fixes #1367

Signed-off-by: Tom Roberts <tomroberts@lowrisc.org>
This commit is contained in:
Tom Roberts 2021-06-17 15:48:59 +01:00 • committed by Tom Roberts
parent f3b163af35
commit a8e17579e2
1 changed files with 1 additions and 1 deletions
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2
rtl/ibex_decoder.sv
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@ -748,7 +748,7 @@ module ibex_decoder #(
// First evaluate the branch condition
alu_op_a_mux_sel_o = OP_A_REG_A;
alu_op_b_mux_sel_o = OP_B_REG_B;
end else begin
end else if (!BranchTargetALU) begin
// Then calculate jump target
alu_op_a_mux_sel_o = OP_A_CURRPC;
alu_op_b_mux_sel_o = OP_B_IMM;