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Cleaned up comments about pc reset.

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Rose Thompson 2023-12-13 13:06:33 -06:00
parent c98c0dd3e0
commit 3d0f9ce4f3
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src/ifu/ifu.sv
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@ -305,15 +305,10 @@ module ifu import cvw::*; #(parameter cvw_t P) (
// pcadder
// add 2 or 4 to the PC, based on whether the instruction is 16 bits or 32
// *** consider using PCPlus2or4F = PCF + CompressedF ? 2 : 4;
assign PCPlus4F = PCF[P.XLEN-1:2] + 1; // add 4 to PC
// choose PC+2 or PC+4 based on CompressedF, which arrives later.
// Speeds up critical path as compared to selecting adder input based on CompressedF
// *** consider gating PCPlus4F to provide the reset.
// *** There is actually a bug in the regression test. We fetched an address which returns data with
// an X. This version of the code does not die because if CompressedF is an X it just defaults to the last
// option. The above code would work, but propagates the x.
always_comb
if (CompressedF) // add 2
if (PCF[1]) PCPlus2or4F = {PCPlus4F, 2'b00};