X-Git-Url: http://git.joshuawise.com/firearm.git/blobdiff_plain/0ede28efad9b536d699c10d257eb2b6a3804919f..a02d953fd172f2a0ba14a30116d6cdc4885ef4e1:/Issue.v diff --git a/Issue.v b/Issue.v index 8fba308..792fdbd 100644 --- a/Issue.v +++ b/Issue.v @@ -167,7 +167,7 @@ module Issue( (idxbit(rs) | idxbit(rm)) : (idxbit(rm)))) | (((alu_opc != `ALU_MOV) && (alu_opc != `ALU_MVN)) ? idxbit(rn) : 0); - def_cpsr = insn[20] /* S */ | alu_is_logical(alu_opc); + def_cpsr = insn[20] /* S */; def_regs = alu_flags_only(alu_opc) ? 0 : idxbit(rd); end `DECODE_LDRSTR_UNDEFINED: /* Undefined. I hate ARM */ @@ -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 @@ -196,7 +196,7 @@ module Issue( use_cpsr = `COND_MATTERS(cond); use_regs = 0; def_cpsr = 0; - def_regs = 0; + def_regs = insn[24] /* L */ ? (16'b1 << 14) : 0; end `DECODE_LDCSTC: /* Coprocessor data transfer */ begin @@ -282,24 +282,32 @@ 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; /* 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 - 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; - regs_inflight[0] <= regs_inflight[1]; - regs_inflight[1] <= (waiting || inbubble || !condition_met) ? 0 : def_regs; - if (waiting) - begin $display("ISSUE: Stalling instruction %08x because %d/%d", insn, waiting_cpsr, waiting_regs); - end - outbubble <= inbubble | waiting | !condition_met; - outpc <= inpc; - outinsn <= insn; + 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; + regs_inflight[0] <= regs_inflight[1]; + regs_inflight[1] <= (waiting || inbubble || !condition_met) ? 0 : def_regs; + + outbubble <= inbubble | waiting | !condition_met | flush | delayedflush; + outpc <= inpc; + outinsn <= insn; + end end endmodule