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The optimzied PC+2/4 logic still hanges on wally32priv.

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This commit is contained in:
Ross Thompson 2022-12-21 09:19:34 -06:00
parent 6858b7568c
commit 91f948a91c
1 changed files with 2 additions and 2 deletions
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4
pipelined/src/ifu/ifu.sv
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@ -299,9 +299,11 @@ module ifu (
// 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.
/* -----\/----- EXCLUDED -----\/-----
assign PCPlus2or4F[0] = '0;
assign PCPlus2or4F[1] = ~reset & (CompressedF ^ PCF[1]);
assign PCPlus2or4F[`XLEN-1:2] = reset ? '0 : CompressedF & ~PCF[1] ? PCF[`XLEN-1:2] : PCPlus4F;
-----/\----- EXCLUDED -----/\----- */
/* -----\/----- EXCLUDED -----\/-----
assign PCPlus2or4F[1:0] = reset ? 2'b00 : CompressedF ? PCF[1] ? 2'b00 : 2'b10 : PCF[1:0];
-----/\----- EXCLUDED -----/\----- */
@ -309,14 +311,12 @@ module ifu (
// *** 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.
/* -----\/----- EXCLUDED -----\/-----
always_comb
if(reset) PCPlus2or4F = '0;
else if (CompressedF) // add 2
if (PCF[1]) PCPlus2or4F = {PCPlus4F, 2'b00};
else PCPlus2or4F = {PCF[`XLEN-1:2], 2'b10};
else PCPlus2or4F = {PCPlus4F, PCF[1:0]}; // add 4
-----/\----- EXCLUDED -----/\----- */
////////////////////////////////////////////////////////////////////////////////////////////////