Replace DelayInfo with DelayPair/DelayQuad

This replaces the arch-specific DelayInfo structure with new DelayPair
(min/max only) and DelayQuad (min/max for both rise and fall) structures
that form part of common code.

This further reduces the amount of arch-specific code; and also provides
useful data structures for timing analysis which will need to delay
with pairs/quads of delays as it is improved.

While there may be a small performance cost to arches that didn't
separate the rise/fall cases (arches that aren't currently separating
the min/max cases just need to be fixed...) in DelayInfo, my expectation
is that inlining will mean this doesn't make much difference.

Signed-off-by: gatecat <gatecat@ds0.me>

1 files changed, 6 insertions, 3 deletions

diff --git a/nexus/pack.cc b/nexus/pack.cc
index 4b076e93..af1a921d 100644
--- a/nexus/pack.cc
+++ b/nexus/pack.cc
@@ -1862,9 +1862,12 @@ struct NexusPacker
                 return;
             }
             to->clkconstr = std::unique_ptr<ClockConstraint>(new ClockConstraint());
-            to->clkconstr->low = ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->low.min_delay) / ratio);
-            to->clkconstr->high = ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->high.min_delay) / ratio);
-            to->clkconstr->period = ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->period.min_delay) / ratio);
+            to->clkconstr->low =
+                    DelayPair(ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->low.min_delay) / ratio));
+            to->clkconstr->high =
+                    DelayPair(ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->high.min_delay) / ratio));
+            to->clkconstr->period =
+                    DelayPair(ctx->getDelayFromNS(ctx->getDelayNS(from->clkconstr->period.min_delay) / ratio));
             log_info("    Derived frequency constraint of %.1f MHz for net %s\n", MHz(to->clkconstr->period.min_delay),
                      to->name.c_str(ctx));
             changed_nets.insert(to->name);