From 07c4a7d4388cdacaa15512dd2f6f0f9e9fcb31f5 Mon Sep 17 00:00:00 2001 From: Bogdan Vukobratovic Date: Fri, 26 Jul 2019 11:36:48 +0200 Subject: Implement opt_share This pass identifies arithmetic operators that share an operand and whose results are used in mutually exclusive cases controlled by a multiplexer, and merges them together by multiplexing the other operands --- tests/opt/opt_share_cat.v | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 tests/opt/opt_share_cat.v (limited to 'tests/opt/opt_share_cat.v') diff --git a/tests/opt/opt_share_cat.v b/tests/opt/opt_share_cat.v new file mode 100644 index 000000000..c32073360 --- /dev/null +++ b/tests/opt/opt_share_cat.v @@ -0,0 +1,15 @@ +module add_sub( + input [15:0] a, + input [15:0] b, + input [15:0] c, + input [15:0] d, + input sel, + output [63:0] res, + ); + + reg [31: 0] cat1 = {a+b, c+d}; + reg [31: 0] cat2 = {a-b, c-d}; + + assign res = {b, sel ? cat1 : cat2, a}; + +endmodule -- cgit v1.2.3