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Add support for overflow using pattern detector

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This commit is contained in:
Eddie Hung 2019-09-18 09:39:59 -07:00
parent 0932e23dff
commit 1f18736d20
2 changed files with 31 additions and 1 deletions
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13
passes/pmgen/xilinx_dsp.pmg
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@ -264,7 +264,6 @@ match postAdd
select postAdd->type.in($add)
select GetSize(port(postAdd, \Y)) <= 48
select nusers(port(postAdd, \Y)) == 2
choice <IdString> AB {\A, \B}
select nusers(port(postAdd, AB)) <= 3
filter ffMcemux || nusers(port(postAdd, AB)) == 2
@ -356,6 +355,18 @@ code argQ ffC ffCcemux ffCrstmux ffCcepol ffCrstpol sigC clock
}
endcode
match overflow
if ffP
if dsp->parameters.at(\USE_PATTERN_DETECT, Const("NO_PATDET")).decode_string() == "NO_PATDET"
select overflow->type.in($ge)
select GetSize(port(overflow, \Y)) <= 48
select port(overflow, \B).is_fully_const()
// Check is exact power of 2
select (port(overflow, \B).as_int() & (port(overflow, \B).as_int()-1)) == 0
index <SigSpec> port(overflow, \A) === sigP
optional
endmatch
code
accept;
endcode