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archapi: Add getArcDelayOverride

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Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2023-05-17 10:31:39 +02:00 committed by Lofty
parent 98121308e0
commit ea925f39fb
5 changed files with 29 additions and 0 deletions
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1
common/kernel/arch_api.h
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@ -119,6 +119,7 @@ template <typename R> struct ArchAPI : BaseCtx
virtual bool getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const = 0;
virtual delay_t estimateDelay(WireId src, WireId dst) const = 0;
virtual BoundingBox getRouteBoundingBox(WireId src, WireId dst) const = 0;
virtual bool getArcDelayOverride(const NetInfo *net_info, const PortRef &sink, DelayQuad &delay) const = 0;
// Decal methods
virtual typename R::DecalGfxRangeT getDecalGraphics(DecalId decal) const = 0;
virtual DecalXY getBelDecal(BelId bel) const = 0;

4
common/kernel/base_arch.h
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@ -317,6 +317,10 @@ template <typename R> struct BaseArch : ArchAPI<R>
{
return false;
}
virtual bool getArcDelayOverride(const NetInfo *net_info, const PortRef &sink, DelayQuad &delay) const override
{
return false;
}
// Decal methods
virtual typename R::DecalGfxRangeT getDecalGraphics(DecalId decal) const override

11
common/kernel/context.cc
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@ -128,6 +128,12 @@ delay_t Context::getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &us
if (src_wire == WireId())
return 0;
DelayQuad quad_result;
if (getArcDelayOverride(net_info, user_info, quad_result)) {
// Arch overrides delay
return quad_result.maxDelay();
}
delay_t max_delay = 0;
for (auto dst_wire : getNetinfoSinkWires(net_info, user_info)) {
@ -173,6 +179,11 @@ DelayQuad Context::getNetinfoRouteDelayQuad(const NetInfo *net_info, const PortR
DelayQuad result(std::numeric_limits<delay_t>::max(), std::numeric_limits<delay_t>::lowest());
if (getArcDelayOverride(net_info, user_info, result)) {
// Arch overrides delay
return result;
}
for (auto dst_wire : getNetinfoSinkWires(net_info, user_info)) {
WireId cursor = dst_wire;
DelayQuad delay{0};

8
docs/archapi.md
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@ -551,6 +551,14 @@ Overwrite or modify (in-place) the timing budget for a given arc. Returns a bool
*BaseArch default: returns false*
### bool getArcDelayOverride(const NetInfo \*net_info, const PortRef &sink, DelayQuad &delay) const
This allows an arch to provide a more precise method for calculating the delay for a routed arc than
summing wire and pip delays; for example a SPICE simulation. If available, `delay` should be set and
`true` returned.
*BaseArch default: returns false*
Flow Methods
------------

5
fpga_interchange/arch.h
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@ -709,6 +709,11 @@ struct Arch : ArchAPI<ArchRanges>
uint32_t getDelayChecksum(delay_t v) const final { return v; }
bool getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const final;
bool getArcDelayOverride(const NetInfo *net_info, const PortRef &sink, DelayQuad &delay) const final
{
return false;
}
// -------------------------------------------------
void place_iobufs(WireId pad_wire, NetInfo *net,