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Implement tgamma derivative #2140

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Oct 30, 2024
Merged

Implement tgamma derivative #2140

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11 changes: 11 additions & 0 deletions enzyme/Enzyme/InstructionDerivatives.td
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Original file line number Diff line number Diff line change
Expand Up @@ -559,6 +559,17 @@ def : CallPattern<(Op $x, $y),
[ReadNone, NoUnwind]
>;

def : CallPattern<(Op $x),
["tgamma"],
[
(
FMul (Call<(ArgAsRetTypesFunc<"digamma">), [ReadNone,NoUnwind]> $x), (DiffeRet)
)
],
(ForwardFromSummedReverse),
[ReadNone, NoUnwind]
>;

def : CallPattern<(Op $x),
["logabsgamma"],
[
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9 changes: 9 additions & 0 deletions enzyme/test/Enzyme/ReverseMode/tgamma.ll
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Expand Up @@ -33,3 +33,12 @@ declare double @tgamma(double)
; CHECK-NEXT: }

; CHECK: define internal fastcc { double } @diffea5(double %arg, double %differeturn)
; CHECK-NEXT: bb:
; CHECK-NEXT: %i8 = call double @tgamma(double %arg) #1
; CHECK-NEXT: %0 = fmul fast double %differeturn, %arg
; CHECK-NEXT: %1 = fmul fast double %i8, %differeturn
; CHECK-NEXT: %2 = call fast double @digamma(double %arg) #0
; CHECK-NEXT: %3 = fmul fast double %2, %0
; CHECK-NEXT: %4 = fadd fast double %1, %3
; CHECK-NEXT: %5 = insertvalue { double } undef, double %4, 0
; CHECK-NEXT: ret { double } %5
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