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Use faster model for ice40 predictDelay()

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2018-08-04 20:16:43 +02:00
parent f6b3333a7d
commit 175da732ac
1 changed files with 6 additions and 1 deletions
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7
ice40/delay.cc
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@ -23,7 +23,7 @@
NEXTPNR_NAMESPACE_BEGIN
#define NUM_FUZZ_ROUTES 1000
#define NUM_FUZZ_ROUTES 100000
void ice40DelayFuzzerMain(Context *ctx)
{
@ -218,6 +218,10 @@ delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
if (dx <= 1 && dy <= 1)
return p.neighbourhood;
#if 1
// Model #0
return (p.model0_offset + p.model0_norm1 * (dx + dy)) / 128;
#else
float norm1 = dx + dy;
float dx2 = dx * dx;
@ -240,6 +244,7 @@ delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
v /= 128;
return v;
#endif
}
NEXTPNR_NAMESPACE_END