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| author | Clifford Wolf <clifford@clifford.at> | 2014-08-18 00:27:54 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2014-08-18 00:27:54 +0200 |
| commit | 6f33fc3e87f5d0429f2236662eb31954e51a71ed (patch) | |
| tree | cfa3493d041d67cec4096d630dbadcd75415c0dd | |
| parent | 4b3834e0cc3c34b6845ab50ffd7e9fe396173e8d (diff) | |
| download | yosys-6f33fc3e87f5d0429f2236662eb31954e51a71ed.tar.gz yosys-6f33fc3e87f5d0429f2236662eb31954e51a71ed.tar.bz2 yosys-6f33fc3e87f5d0429f2236662eb31954e51a71ed.zip | |
Performance fix for new $__lcu techmap rule
| -rw-r--r-- | techlibs/common/techmap.v | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/techlibs/common/techmap.v b/techlibs/common/techmap.v index 5bbe883ef..366351ec0 100644 --- a/techlibs/common/techmap.v +++ b/techlibs/common/techmap.v @@ -293,7 +293,7 @@ module \$__lcu (P, G, CI, CO); output reg [WIDTH:0] CO; - integer i, j, k; + integer i, j; reg [WIDTH-1:0] p, g; wire [1023:0] _TECHMAP_DO_ = "proc; opt -fast"; @@ -312,18 +312,16 @@ module \$__lcu (P, G, CI, CO); // Main tree for (i = 1; i <= $clog2(WIDTH); i = i+1) begin for (j = 2**i - 1; j < WIDTH; j = j + 2**i) begin - k = j - 2**(i-1); - g[j] = g[j] | p[j] & g[k]; - p[j] = p[j] & p[k]; + g[j] = g[j] | p[j] & g[j - 2**(i-1)]; + p[j] = p[j] & p[j - 2**(i-1)]; end end // Inverse tree for (i = $clog2(WIDTH); i > 0; i = i-1) begin for (j = 2**i + 2**(i-1) - 1; j < WIDTH; j = j + 2**i) begin - k = j - 2**(i-1); - g[j] = g[j] | p[j] & g[k]; - p[j] = p[j] & p[k]; + g[j] = g[j] | p[j] & g[j - 2**(i-1)]; + p[j] = p[j] & p[j - 2**(i-1)]; end end end |