A No-Pipeline version of fp_mult w/o top test bench
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fpu_mult.mpf
32
fpu_mult.mpf
@ -2304,21 +2304,25 @@ suppress = 8780 ;an explanation can be had by running: verror 8780
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Project_Version = 6
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Project_DefaultLib = work
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Project_SortMethod = unused
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Project_Files_Count = 7
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Project_File_0 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/normalize_mult.sv
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Project_File_P_0 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 folder src last_compile 1749838823 cover_fsm 0 cover_branch 0 vlog_noload 0 vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 2 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_File_1 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/fp_mult_top.sv
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Project_File_P_1 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 folder {Top Level} last_compile 1749470139 cover_fsm 0 cover_branch 0 vlog_noload 0 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 0 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_2 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/sim/round_mult_tb.sv
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Project_File_P_2 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 cover_fsm 0 cover_branch 0 vlog_noload 0 folder sim last_compile 1749484994 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 6 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_Files_Count = 9
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Project_File_0 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/fp_mult_top.sv
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Project_File_P_0 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 vlog_noload 0 folder {Top Level} last_compile 1749470139 cover_fsm 0 cover_branch 0 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 0 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_1 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/normalize_mult.sv
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Project_File_P_1 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 vlog_noload 0 folder src last_compile 1749838823 cover_fsm 0 cover_branch 0 vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 2 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_File_2 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/round_modes.sv
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Project_File_P_2 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 folder src last_compile 1749985365 cover_fsm 0 cover_branch 0 vlog_noload 0 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 8 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_3 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/fp_mult.sv
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Project_File_P_3 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 last_compile 1749844905 cover_fsm 0 cover_branch 0 vlog_noload 0 folder src cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 3 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_4 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/sim/normalize_mult_tb.sv
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Project_File_P_4 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 last_compile 1749840708 cover_fsm 0 cover_branch 0 vlog_noload 0 folder sim vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 5 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_File_5 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/sim/fp_mult_tb.sv
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Project_File_P_5 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 folder sim last_compile 1749488181 cover_fsm 0 cover_branch 0 vlog_noload 0 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 4 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_6 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/round_mult.sv
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Project_File_P_6 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 cover_fsm 0 cover_branch 0 vlog_noload 0 folder src last_compile 1749844323 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 1 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_P_3 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 vlog_noload 0 folder src last_compile 1749991254 cover_fsm 0 cover_branch 0 vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 3 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_File_4 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/sim/round_mult_tb.sv
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Project_File_P_4 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 last_compile 1749484994 cover_fsm 0 cover_branch 0 vlog_noload 0 folder sim cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 6 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_5 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/exception_mult.sv
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Project_File_P_5 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 cover_fsm 0 cover_branch 0 vlog_noload 0 folder src last_compile 1749989714 vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 7 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_File_6 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/sim/normalize_mult_tb.sv
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Project_File_P_6 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 folder sim last_compile 1749840708 cover_fsm 0 cover_branch 0 vlog_noload 0 vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 5 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_File_7 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/src/round_mult.sv
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Project_File_P_7 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 cover_fsm 0 cover_branch 0 vlog_noload 0 folder src last_compile 1749991129 cover_excludedefault 0 vlog_enable0In 0 vlog_disableopt 0 cover_covercells 0 voptflow 1 vlog_showsource 0 vlog_hazard 0 cover_optlevel 3 toggle - vlog_0InOptions {} ood 0 cover_noshort 0 vlog_upper 0 compile_to work vlog_options {} compile_order 1 cover_expr 0 dont_compile 0 cover_stmt 0
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Project_File_8 = /home/hoo2/Public/AUTH/HWDigSys-II/fpu_mult/sim/fp_mult_tb.sv
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Project_File_P_8 = cover_toggle 0 file_type systemverilog group_id 0 cover_exttoggle 0 cover_nofec 0 cover_cond 0 vlog_1995compat SV vlog_nodebug 0 last_compile 1749991928 cover_fsm 0 cover_branch 0 vlog_noload 0 folder sim vlog_enable0In 0 cover_excludedefault 0 vlog_disableopt 0 cover_covercells 0 cover_optlevel 3 vlog_hazard 0 vlog_showsource 0 voptflow 1 ood 0 vlog_0InOptions {} toggle - vlog_options {} compile_to work vlog_upper 0 cover_noshort 0 compile_order 4 dont_compile 0 cover_expr 0 cover_stmt 0
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Project_Sim_Count = 0
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Project_Folder_Count = 2
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Project_Folder_0 = src
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@ -7,16 +7,38 @@ module fp_mult_tb;
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logic [2:0] rnd;
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logic [7:0] status;
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logic clk = 0, rst = 0;
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/*
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// DEBUG signals
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logic sign_res_;
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logic [9:0] exp_sum_;
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logic [47:0] mant_prod_;
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logic [22:0] mant_norm_;
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logic [9:0] exp_norm_;
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logic guard_, sticky_;
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logic [24:0] mant_post_rnd_;
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logic [9:0] exp_post_rnd_;
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*/
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// DUT
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fp_mult dut (
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.a(a),
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.b(b),
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.rnd(rnd),
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.round(rnd),
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.z(z),
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.status(status),
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.clk(clk),
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.rst(rst)
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/*
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// DEBUG signals
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.sign_res_(sign_res_),
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.exp_sum_(exp_sum_),
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.mant_prod_(mant_prod_),
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.mant_norm_(mant_norm_),
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.exp_norm_(exp_norm_),
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.guard_(guard_),
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.sticky_(sticky_),
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.mant_post_rnd_(mant_post_rnd_),
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.exp_post_rnd_(exp_post_rnd_)
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*/
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);
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// Clock generation
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@ -29,35 +51,50 @@ module fp_mult_tb;
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string desc;
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} test_vector_t;
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test_vector_t tests [11];
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test_vector_t tests [14];
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initial begin
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$display("Starting fp_mult test...\n");
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// Normal multiplication cases
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tests[0] = '{32'h3f800000, 32'h40000000, 32'h40400000, "1.0 * 2.0 = 2.0"};
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tests[1] = '{32'h40400000, 32'h40400000, 32'h40c00000, "3.0 * 3.0 = 9.0"};
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tests[2] = '{32'hbf800000, 32'h40000000, 32'hc0400000, "-1.0 * 2.0 = -2.0"};
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tests[3] = '{32'h3f000000, 32'h3f000000, 32'h3e800000, "0.5 * 0.5 = 0.25"};
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tests[4] = '{32'h3f800000, 32'h00000000, 32'h00000000, "1.0 * 0.0 = 0.0"};
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tests[0] = '{32'h3f800000, 32'h40000000, 32'h40000000, "1.0 * 2.0 = 2.0"};
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tests[1] = '{32'h40400000, 32'h40400000, 32'h41100000, "3.0 * 3.0 = 9.0"};
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tests[2] = '{32'hc0400000, 32'h40400000, 32'hc1100000, "-3.0 * 3.0 = 9.0"};
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tests[3] = '{32'hbf800000, 32'h40000000, 32'hc0000000, "-1.0 * 2.0 = -2.0"};
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tests[4] = '{32'h3f000000, 32'h3f000000, 32'h3e800000, "0.5 * 0.5 = 0.25"};
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tests[5] = '{32'h3f800000, 32'h00000000, 32'h00000000, "1.0 * 0.0 = 0.0"};
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tests[6] = '{32'h42280000, 32'hc0e00000, 32'hc3930000, "42.0 * -7.0 = -294.0"};
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tests[7] = '{32'h414570a4, 32'hb8d1b717, 32'hbaa1be2b, "12.34 * -0.0001 = -0.001234"};
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// Corner cases (some may fail if not handled yet)
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tests[5] = '{32'h7f800000, 32'h3f800000, 32'h7f800000, "inf * 1.0 = inf"};
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tests[6] = '{32'hff800000, 32'h3f800000, 32'hff800000, "-inf * 1.0 = -inf"};
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tests[7] = '{32'h7fc00000, 32'h3f800000, 32'h7fc00000, "NaN * 1.0 = NaN"};
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tests[8] = '{32'h00800000, 32'h00800000, 32'h00000000, "denorm * denorm = underflow"};
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tests[9] = '{32'h7f7fffff, 32'h7f7fffff, 32'h7f800000, "max * max = inf (overflow)"};
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tests[10] = '{32'h00000000, 32'hff800000, 32'hffc00000, "0.0 * -inf = NaN"};
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tests[8] = '{32'h00000000, 32'h80000000, 32'h80000000, "0.0 * -0.0 = -0.0"};
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tests[9] = '{32'h3f800000, 32'h80000000, 32'h80000000, "1.0 * -0.0 = -0.0"};
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tests[10] = '{32'h7f800000, 32'h3f800000, 32'h7f800000, "inf * 1.0 = inf"};
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tests[11] = '{32'hff800000, 32'h7f800000, 32'hff800000, "-inf * inf = -inf"};
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tests[12] = '{32'h00000000, 32'h7f800000, 32'h7f800000, "0.0 * inf = inf - nan"};
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tests[13] = '{32'h80000000, 32'hff800000, 32'h7f800000, "-0.0 * -inf = inf - nan"};
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rnd = 3'b000; // default round to nearest
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rst = 1; #10;
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rst = 0; #10;
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for (int i = 0; i < 11; i++) begin
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for (int i = 0; i < 14; i++) begin
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a = tests[i].a;
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b = tests[i].b;
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#20;
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$display("[%0d] %s", i+1, tests[i].desc);
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/*
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// DEBUG prints
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$display("fp_mult: sign bit = %h", sign_res_);
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$display("fp_mult: exp (pre norm) = %h", exp_sum_);
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$display("fp_mult: mant (pre norm) = %h", mant_prod_);
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$display("fp_mult: exp (norm) = %h", exp_norm_);
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$display("fp_mult: mant (norm) = %h", mant_norm_);
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$display("fp_mult: guard,sticky = %h,%h", guard_,sticky_);
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$display("fp_mult: exp (post rnd) = %h", exp_post_rnd_);
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$display("fp_mult: mant (post rnd) = %h", mant_post_rnd_);
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*/
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$display(" A=%h B=%h => Z=%h (expected %h) %s\n",
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a, b, z, tests[i].expected,
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(z === tests[i].expected) ? "PASS" : "FAIL");
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118
src/exception_mult.sv
Normal file
118
src/exception_mult.sv
Normal file
@ -0,0 +1,118 @@
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/*
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*
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*/
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`include "round_modes.sv"
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module exception_mult (
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input logic [31:0] a, b,
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input logic [31:0] z_calc,
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input logic ovf, unf, inexact,
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input logic [2:0] round,
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output logic [31:0] z,
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output logic zero_f, inf_f, nan_f, tiny_f, huge_f, inexact_f
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);
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// === ENUM DECLARATION ===
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typedef enum logic [2:0] {
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ZERO,
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INF,
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NORM,
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MIN_NORM,
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MAX_NORM
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} interp_t;
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// === num_interp FUNCTION ===
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function interp_t num_interp(input logic [31:0] x);
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automatic logic [7:0] exp = x[30:23];
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automatic logic [22:0] mant = x[22:0];
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if (exp == 8'd255)
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return INF;
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else if (exp == 8'd0)
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return ZERO;
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else if (exp == 8'd1 && mant == 0)
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return MIN_NORM;
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else if (exp == 8'd254 && mant == 23'h7FFFFF)
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return MAX_NORM;
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else
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return NORM;
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endfunction
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// === z_num FUNCTION ===
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function logic [30:0] z_num(input interp_t kind);
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case (kind)
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ZERO: return 31'd0;
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INF: return {8'd255, 23'd0};
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MIN_NORM: return {8'd1, 23'd0};
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MAX_NORM: return {8'd254, 23'h7FFFFF};
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default: return 31'd0;
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endcase
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endfunction
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// === MAIN LOGIC ===
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interp_t a_class, b_class;
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logic sign;
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always_comb begin
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a_class = num_interp(a);
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b_class = num_interp(b);
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sign = z_calc[31];
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// Default flags
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{zero_f, inf_f, nan_f, tiny_f, huge_f, inexact_f} = '0;
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z = z_calc;
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case ({a_class, b_class})
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{ZERO, ZERO}, {ZERO, NORM}, {NORM, ZERO}:
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begin
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z = {sign, z_num(ZERO)};
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zero_f = 1;
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end
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{ZERO, INF}, {INF, ZERO}:
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begin
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z = {1'b0, z_num(INF)};
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nan_f = 1;
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end
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{INF, INF}, {NORM, INF}, {INF, NORM}:
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begin
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z = {sign, z_num(INF)};
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inf_f = 1;
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end
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default: begin // {NORM, NORM}
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if (ovf) begin
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case (round)
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RND_IEEE_NEAREST_EVEN: z = {sign, z_num(MAX_NORM)};
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RND_IEEE_ZERO: z = {sign, z_num(MAX_NORM)};
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RND_IEEE_PINF: z = (sign == 0) ? {1'b0, z_num(INF)} : {1'b1, z_num(MAX_NORM)};
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RND_IEEE_NINF: z = (sign == 1) ? {1'b1, z_num(INF)} : {1'b0, z_num(MAX_NORM)};
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RND_NEAR_UP: z = (sign == 0) ? {1'b1, z_num(INF)} : {1'b0, z_num(MIN_NORM)};
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RND_AWAY_ZERO: z = {sign, z_num(MAX_NORM)};
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default: z = {sign, z_num(MAX_NORM)};
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endcase
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huge_f = 1;
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end
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else if (unf) begin
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case (round)
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RND_IEEE_NEAREST_EVEN: z = {sign, z_num(MIN_NORM)};
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RND_IEEE_ZERO: z = {sign, z_num(ZERO)};
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RND_IEEE_PINF: z = (sign == 0) ? {1'b0, z_num(MIN_NORM)} : {1'b1, z_num(ZERO)};
|
||||
RND_IEEE_NINF: z = (sign == 1) ? {1'b1, z_num(MIN_NORM)} : {1'b0, z_num(ZERO)};
|
||||
RND_NEAR_UP: z = (sign == 1) ? {1'b1, z_num(ZERO)} : {1'b0, z_num(MIN_NORM)};
|
||||
RND_AWAY_ZERO: z = {sign, z_num(MIN_NORM)};
|
||||
default: z = {sign, z_num(MIN_NORM)};
|
||||
endcase
|
||||
tiny_f = 1;
|
||||
end
|
||||
inf_f = (z[30:0] == z_num(INF));
|
||||
zero_f = (z[30:0] == z_num(ZERO));
|
||||
inexact_f = inexact || ovf || unf;
|
||||
end
|
||||
endcase
|
||||
end
|
||||
|
||||
endmodule
|
||||
|
||||
@ -9,6 +9,17 @@ module fp_mult (
|
||||
output logic [7:0] status, // status flags (placeholder)
|
||||
input logic clk,
|
||||
input logic rst
|
||||
/*
|
||||
// debug outputs
|
||||
output logic sign_res_,
|
||||
output logic [9:0] exp_sum_,
|
||||
output logic [47:0] mant_prod_,
|
||||
output logic [22:0] mant_norm_,
|
||||
output logic [9:0] exp_norm_,
|
||||
output logic guard_, sticky_,
|
||||
output logic [24:0] mant_post_rnd_,
|
||||
output logic [9:0] exp_post_rnd_
|
||||
*/
|
||||
);
|
||||
|
||||
// === STEP 0: Parse inputs
|
||||
@ -31,17 +42,20 @@ module fp_mult (
|
||||
// === STEP 1: Floating point number sign calculation
|
||||
logic sign_res;
|
||||
assign sign_res = sign_a ^ sign_b;
|
||||
//assign sign_res_ = sign_res; // DEBUG
|
||||
|
||||
// === STEP 2,3. Exponent addition, Exponent subtraction of bias
|
||||
logic [9:0] exp_sum;
|
||||
always_comb begin
|
||||
exp_sum = exp_a + exp_b - 127; // apply bias
|
||||
//exp_sum_ = exp_sum; // DEBUG
|
||||
end
|
||||
|
||||
// === STEP 4: Mantissa multiplication (including leading ones)
|
||||
logic [47:0] mant_prod;
|
||||
always_comb begin
|
||||
mant_prod = mant_a * mant_b;
|
||||
//mant_prod_ = mant_prod; // DEBUG
|
||||
end
|
||||
|
||||
// === STEP 5: Truncation and normalization
|
||||
@ -57,8 +71,13 @@ module fp_mult (
|
||||
.guard_bit(guard),
|
||||
.sticky_bit(sticky)
|
||||
);
|
||||
//assign mant_norm_ = mant_norm; // DEBUG
|
||||
//assign exp_norm_ = exp_norm; // DEBUG
|
||||
//assign guard_ = guard; // DEBUG
|
||||
//assign sticky_ = sticky; // DEBUG
|
||||
|
||||
// === STEP 6: Pipeline stage
|
||||
// Ehhh... We dont do that here...
|
||||
|
||||
// === STEP 7: Rounding
|
||||
logic [24:0] mant_post_rnd;
|
||||
@ -68,6 +87,7 @@ module fp_mult (
|
||||
round_mult round_inst (
|
||||
.mantissa_in(mant_norm),
|
||||
.exponent_in(exp_norm),
|
||||
.sign_in(sign_res),
|
||||
.guard_bit(guard),
|
||||
.sticky_bit(sticky),
|
||||
.round(round),
|
||||
@ -75,13 +95,36 @@ module fp_mult (
|
||||
.exponent_out(exp_post_rnd),
|
||||
.inexact(inexact)
|
||||
);
|
||||
//assign mant_post_rnd_ = mant_post_rnd; // DEBUG
|
||||
//assign exp_post_rnd_ = exp_post_rnd; // DEBUG
|
||||
|
||||
// === STEP 8: Exception handling
|
||||
// overflow / underflow:
|
||||
logic [31:0] z_calc;
|
||||
logic ovf, unf;
|
||||
|
||||
assign z = {sign_res, exp_post_rnd[7:0], mant_post_rnd[22:0]};
|
||||
assign z_calc = {sign_res, exp_post_rnd[7:0], mant_post_rnd[22:0]};
|
||||
always_comb begin
|
||||
ovf = (exp_post_rnd > 10'd254); // MAX normal exponent
|
||||
unf = (exp_post_rnd < 10'd1); // MIN normal exponent
|
||||
end
|
||||
|
||||
// === STEP 6: Status flags (placeholder) ===
|
||||
assign status = 8'b00000000;
|
||||
exception_mult exc_inst (
|
||||
.a(a),
|
||||
.b(b),
|
||||
.z_calc(z_calc),
|
||||
.ovf(ovf),
|
||||
.unf(unf),
|
||||
.inexact(inexact),
|
||||
.round(round),
|
||||
.z(z),
|
||||
.zero_f(status[0]),
|
||||
.inf_f(status[1]),
|
||||
.nan_f(status[2]),
|
||||
.tiny_f(status[3]),
|
||||
.huge_f(status[4]),
|
||||
.inexact_f(status[5])
|
||||
);
|
||||
|
||||
endmodule
|
||||
|
||||
|
||||
10
src/round_modes.sv
Normal file
10
src/round_modes.sv
Normal file
@ -0,0 +1,10 @@
|
||||
|
||||
// round_modes.svh
|
||||
typedef enum logic [2:0] {
|
||||
RND_IEEE_NEAREST_EVEN = 3'd0,
|
||||
RND_IEEE_ZERO = 3'd1,
|
||||
RND_IEEE_PINF = 3'd2,
|
||||
RND_IEEE_NINF = 3'd3,
|
||||
RND_NEAR_UP = 3'd4,
|
||||
RND_AWAY_ZERO = 3'd5
|
||||
} round_mode_t;
|
||||
@ -1,13 +1,15 @@
|
||||
// round_mult.sv
|
||||
// Rounds a normalized mantissa
|
||||
|
||||
`include "round_modes.sv"
|
||||
|
||||
module round_mult (
|
||||
input logic [22:0] mantissa_in, // Input mantissa (no implicit bit)
|
||||
input logic [9:0] exponent_in, // Input exponent
|
||||
input logic sign_in,
|
||||
input logic guard_bit,
|
||||
input logic sticky_bit,
|
||||
input logic sign_in,
|
||||
input logic round,
|
||||
input logic [2:0] round,
|
||||
output logic [24:0] mantissa_out, // Rounded mantissa (24bit + 1bit possible ovf)
|
||||
output logic [9:0] exponent_out,
|
||||
output logic inexact
|
||||
@ -64,12 +66,12 @@ module round_mult (
|
||||
|
||||
case (round)
|
||||
default: IEEE_nearest_even();
|
||||
0: IEEE_nearest_even();
|
||||
1: IEEE_zero();
|
||||
2: IEEE_pinf();
|
||||
3: IEEE_ninf();
|
||||
4: near_up();
|
||||
5: away_zero();
|
||||
RND_IEEE_NEAREST_EVEN: IEEE_nearest_even();
|
||||
RND_IEEE_ZERO: IEEE_zero();
|
||||
RND_IEEE_PINF: IEEE_pinf();
|
||||
RND_IEEE_NINF: IEEE_ninf();
|
||||
RND_NEAR_UP: near_up();
|
||||
RND_AWAY_ZERO: away_zero();
|
||||
endcase
|
||||
|
||||
// Post-rounding normalization (if overflow in mantissa)
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user