DCache/ICache: reg i -> integer i
[firearm.git] / Issue.v
diff --git a/Issue.v b/Issue.v
index 3c8303a..1b9868d 100644 (file)
--- a/Issue.v
+++ b/Issue.v
@@ -180,7 +180,7 @@ module Issue(
                `DECODE_LDRSTR:
                begin
                        use_cpsr = `COND_MATTERS(cond);
-                       use_regs = idxbit(rn) | (insn[20] /* L */ ? 0 : idxbit(rd));
+                       use_regs = idxbit(rn) | (insn[25] /* I */ ? idxbit(rm) : 0) | (insn[20] /* L */ ? 0 : idxbit(rd));
                        def_cpsr = 0;
                        def_regs = insn[20] /* L */ ? idxbit(rd) : 0;
                end
@@ -282,16 +282,31 @@ module Issue(
                waiting_cpsr = use_cpsr & (cpsr_inflight[0] | cpsr_inflight[1]);
                waiting_regs = |(use_regs & (regs_inflight[0] | regs_inflight[1]));
                
-               outstall = (waiting && !inbubble) || stall;     /* Happens in an always @*, because it is an exception. */
+               outstall = (waiting && !inbubble && !flush) || stall;   /* Happens in an always @*, because it is an exception. */
        end
+
+       reg delayedflush = 0;
+       always @(posedge clk)
+               if (flush && outstall /* halp! I can't do it now, maybe later? */)
+                       delayedflush <= 1;
+               else if (!outstall /* anything has been handled this time around */)
+                       delayedflush <= 0;
        
        /* Actually do the issue. */
        always @(posedge clk)
        begin
                if (waiting)
                        $display("ISSUE: Stalling instruction %08x because %d/%d", insn, waiting_cpsr, waiting_regs);
-       
-               if (!stall)
+
+               if((flush || delayedflush) && !outstall)
+               begin
+                       cpsr_inflight[0] = 1'b0;
+                       cpsr_inflight[1] = 1'b0;
+                       regs_inflight[0] = 16'b0;
+                       regs_inflight[1] = 16'b0;
+                       outbubble <= 1'b1;
+               end
+               else if (!stall)
                begin
                        cpsr_inflight[0] <= cpsr_inflight[1];   /* I'm not sure how well selects work with arrays, and that seems like a dumb thing to get anusulated by. */
                        cpsr_inflight[1] <= (waiting || inbubble || !condition_met) ? 0 : def_cpsr;
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