X-Git-Url: http://git.joshuawise.com/firearm.git/blobdiff_plain/149bcd1aae858c157cb51b351187c66a99410d6d..4dc317445bd5132ca57744d7faf27731ea10d3b9:/Issue.v

diff --git a/Issue.v b/Issue.v
index ef53bc3..1b9868d 100644
--- 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
@@ -282,8 +282,15 @@ 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)
@@ -291,12 +298,13 @@ module Issue(
 		if (waiting)
 			$display("ISSUE: Stalling instruction %08x because %d/%d", insn, waiting_cpsr, waiting_regs);
 
-		if(flush)
+		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
@@ -305,7 +313,7 @@ module Issue(
 			regs_inflight[0] <= regs_inflight[1];
 			regs_inflight[1] <= (waiting || inbubble || !condition_met) ? 0 : def_regs;
 			
-			outbubble <= inbubble | waiting | !condition_met | flush;
+			outbubble <= inbubble | waiting | !condition_met;
 			outpc <= inpc;
 			outinsn <= insn;
 		end