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Do not use shiftmul peepopt pattern when mul result is truncated, fixes #1047

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-05-28 15:33:47 +02:00
parent 2a11c48782
commit cb285e4b87
2 changed files with 15 additions and 4 deletions
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4
tests/simple/peepopt.v
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@ -2,6 +2,10 @@ module peepopt_shiftmul_0 #(parameter N=3, parameter W=3) (input [N*W-1:0] i, in
assign o = i[s*W+:W];
endmodule
module peepopt_shiftmul_1 (output y, input [2:0] w);
assign y = 1'b1 >> (w * (3'b110));
endmodule
module peepopt_muldiv_0(input [1:0] i, output [1:0] o);
wire [3:0] t;
assign t = i * 3;