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Comments about PC+2/4.

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This commit is contained in:
Ross Thompson 2022-12-21 08:35:43 -06:00
parent 5d91b3044f
commit fe723af1af
1 changed files with 9 additions and 3 deletions
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12
pipelined/src/ifu/ifu.sv
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@ -301,10 +301,16 @@ module ifu (
// *** consider gating PCPlusUpperF to provide the reset. // *** consider gating PCPlusUpperF to provide the reset.
/* -----\/----- EXCLUDED -----\/----- /* -----\/----- EXCLUDED -----\/-----
assign PCPlus2or4F[0] = '0; assign PCPlus2or4F[0] = '0;
assign PCPlus2or4F[1] = CompressedF ^ PCF[1]; assign PCPlus2or4F[1] = ~reset & (CompressedF ^ PCF[1]);
assign PCPlus2or4F[`XLEN-1:2] = CompressedF & ~PCF[1] ? PCF[`XLEN-1:2] : PCPlusUpperF; assign PCPlus2or4F[`XLEN-1:2] = reset ? '0 : CompressedF & ~PCF[1] ? PCF[`XLEN-1:2] : PCPlusUpperF;
-----/\----- EXCLUDED -----/\----- */ -----/\----- EXCLUDED -----/\----- */
/* -----\/----- EXCLUDED -----\/-----
assign PCPlus2or4F[1:0] = reset ? 2'b00 : CompressedF ? PCF[1] ? 2'b00 : 2'b10 : PCF[1:0];
-----/\----- EXCLUDED -----/\----- */
// *** 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 always_comb
if(reset) PCPlus2or4F = '0; if(reset) PCPlus2or4F = '0;
else if (CompressedF) // add 2 else if (CompressedF) // add 2