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new fpu implementation

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This commit is contained in:
Blaise Tine
2020-07-24 00:00:37 -04:00
parent f83521b7c6
commit 1f63f9da25
30 changed files with 318 additions and 258 deletions
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18
hw/rtl/VX_decode.v
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@@ -214,14 +214,14 @@ module VX_decode #(
7'h04: fpu_op = `FPU_SUB;
7'h08: fpu_op = `FPU_MUL;
7'h0C: fpu_op = `FPU_DIV;
7'h2C: fpu_op = `FPU_SQRT;
7'h10: fpu_op = (func3[1]) ? `FPU_SGNJX : ((func3[0]) ? `FPU_SGNJN : `FPU_SGNJ);
7'h14: fpu_op = (func3 == 3'h0) ? `FPU_MIN : `FPU_MAX;
7'h2C: fpu_op = `FPU_SQRT;
7'h50: fpu_op = `FPU_CMP; // wb to intReg
7'h60: fpu_op = (instr[20]) ? `FPU_CVTWUS : `FPU_CVTWS; // doesn't need rs2, and read rs1 from fpReg, WB to intReg
7'h68: fpu_op = (instr[20]) ? `FPU_CVTSWU : `FPU_CVTSW; // doesn't need rs2, and read rs1 from intReg
7'h70: fpu_op = (func3 == 3'h0) ? `FPU_MVXW : `FPU_CLASS; // both wb to intReg
7'h78: fpu_op = `FPU_MVWX;
7'h50: fpu_op = `FPU_CMP; // wb to intReg
7'h10: fpu_op = (func3[1]) ? `FPU_SGNJX : ((func3[0]) ? `FPU_SGNJN : `FPU_SGNJ);
7'h70: fpu_op = (func3 == 3'h0) ? `FPU_MVXW : `FPU_CLASS; // both wb to intReg
7'h78: fpu_op = `FPU_MVWX;
default:;
endcase
end
@@ -283,15 +283,15 @@ module VX_decode #(
assign decode_tmp_if.use_rs2 = (decode_tmp_if.rs2 != 0)
&& (is_btype || is_stype || is_rtype || (is_gpu && (gpu_op == `GPU_BAR || gpu_op == `GPU_WSPAWN)));
assign decode_tmp_if.rs1_is_fp = (is_fci && ((func7 != 7'h68) && (fpu_op != `FPU_MVWX)) || is_fr4);
assign decode_tmp_if.rd_is_fp = is_fpu && ~(is_fci && ((func7 == 7'h50) || (func7 == 7'h60) || (func7 == 7'h70)));
assign decode_tmp_if.rs1_is_fp = is_fci && ((func7 != 7'h68) && (fpu_op != `FPU_MVWX)) || is_fr4;
assign decode_tmp_if.rs2_is_fp = is_fs || (is_fci && ((func7 != 7'h60) && (func7 != 7'h68)) || is_fr4);
assign decode_tmp_if.rs3 = rs3;
assign decode_tmp_if.use_rs3 = is_fr4;
assign decode_tmp_if.frm = func3;
assign decode_tmp_if.wb = (is_fpu && (is_fl || (is_fci && ((func7 != 7'h50) || (func7 != 7'h70) || (func7 != 7'h60))) || is_fr4))
|| (~is_fpu && (rd != 0) && (is_itype || is_rtype || is_lui || is_auipc || is_csr || is_jal || is_jalr || is_jals || is_ltype));
assign decode_tmp_if.wb = is_fpu || ((rd != 0) && (is_itype || is_rtype || is_lui || is_auipc || is_csr || is_jal || is_jalr || is_jals || is_ltype));
assign join_if.is_join = in_valid && is_gpu && (gpu_op == `GPU_JOIN);
assign join_if.warp_num = ifetch_rsp_if.warp_num;