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Use unextend lambda

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This commit is contained in:
Eddie Hung 2019-09-06 18:40:11 -07:00
parent b69512a5b9
commit 6a9205280f
1 changed files with 17 additions and 18 deletions
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35
passes/pmgen/xilinx_dsp.pmg
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@ -1,5 +1,6 @@
pattern xilinx_dsp
state <std::function<SigSpec(const SigSpec&, bool)>> unextend
state <SigBit> clock
state <SigSpec> sigA sigffAmuxY sigB sigffBmuxY sigC sigD sigffDmuxY sigM sigP
state <IdString> postAddAB postAddMuxAB
@ -10,29 +11,26 @@ match dsp
select dsp->type.in(\DSP48E1)
endmatch
code sigA sigffAmuxY sigB sigffBmuxY sigD sigM
sigA = port(dsp, \A);
int i;
for (i = GetSize(sigA)-1; i > 0; i--)
if (sigA[i] != sigA[i-1])
break;
// Do not remove non-const sign bit
if (sigA[i].wire)
++i;
sigA.remove(i, GetSize(sigA)-i);
sigB = port(dsp, \B);
for (i = GetSize(sigB)-1; i > 0; i--)
if (sigB[i] != sigB[i-1])
break;
// Do not remove non-const sign bit
if (sigB[i].wire)
++i;
sigB.remove(i, GetSize(sigB)-i);
code unextend sigA sigffAmuxY sigB sigffBmuxY sigC sigD sigffDmuxY sigM
unextend = [](const SigSpec &sig, bool keep_sign) {
int i;
for (i = GetSize(sig)-1; i > 0; i--)
if (sig[i] != sig[i-1])
break;
// Do not remove non-const sign bit
if (!keep_sign && sig[i].wire)
++i;
return sig.extract(0, i);
};
sigA = unextend(port(dsp, \A), false);
sigB = unextend(port(dsp, \B), false);
sigC = dsp->connections_.at(\C, SigSpec());
sigD = dsp->connections_.at(\D, SigSpec());
SigSpec P = port(dsp, \P);
// Only care about those bits that are used
int i;
for (i = 0; i < GetSize(P); i++) {
if (nusers(P[i]) <= 1)
break;
@ -44,6 +42,7 @@ code sigA sigffAmuxY sigB sigffBmuxY sigD sigM
sigffAmuxY = SigSpec();
sigffBmuxY = SigSpec();
sigffDmuxY = SigSpec();
endcode
match ffAD