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fixed FPU handshake, optimized writeback's critical path

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This commit is contained in:
Blaise Tine
2020-08-07 10:11:54 -07:00
parent ffd9515881
commit cd29362d10
26 changed files with 212 additions and 2368 deletions
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18
hw/rtl/fp_cores/VX_fpnew.v
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@@ -11,8 +11,8 @@ module VX_fpnew #(
input wire clk,
input wire reset,
output wire in_ready,
input wire in_valid,
output wire in_ready,
input wire [`ISTAG_BITS-1:0] in_tag,
@@ -25,7 +25,7 @@ module VX_fpnew #(
output wire [`NUM_THREADS-1:0][31:0] result,
output wire has_fflags,
output wire [`NUM_THREADS-1:0][`FFG_BITS-1:0] fflags,
output fflags_t [`NUM_THREADS-1:0] fflags,
output wire [`ISTAG_BITS-1:0] out_tag,
@@ -75,7 +75,7 @@ module VX_fpnew #(
wire [FMTI_BITS-1:0] fpu_int_fmt = fpnew_pkg::INT32;
wire [`NUM_THREADS-1:0][31:0] fpu_result;
fpnew_pkg::status_t fpu_status [0:`NUM_THREADS-1];
fpnew_pkg::status_t [0:`NUM_THREADS-1] fpu_status;
wire is_class_op_i, is_class_op_o;
assign is_class_op_i = (op == `FPU_CLASS);
@@ -194,7 +194,8 @@ module VX_fpnew #(
`ENABLE_TRACING
assign fpu_in_valid = in_valid;
assign in_ready = fpu_in_ready;
assign in_ready = fpu_in_ready
|| ~in_valid; // fix fpnews's in_ready containing in_valid;
assign fpu_in_tag = in_tag;
assign out_tag = fpu_out_tag;
@@ -202,14 +203,7 @@ module VX_fpnew #(
assign result = fpu_result;
assign has_fflags = fpu_has_fflags_o;
for (i = 0; i < `NUM_THREADS; i++) begin
assign fflags[i][`FFG_NX] = fpu_status[i].NX;
assign fflags[i][`FFG_UF] = fpu_status[i].UF;
assign fflags[i][`FFG_OF] = fpu_status[i].OF;
assign fflags[i][`FFG_DZ] = fpu_status[i].DZ;
assign fflags[i][`FFG_NV] = fpu_status[i].NV;
end
assign fflags = fpu_status;
assign out_valid = fpu_out_valid;
assign fpu_out_ready = out_ready;