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Make the order of operations explicit for the error term of Dekker

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double-precision multiply.

FossilOrigin-Name: 28f57b34e6b11184a36e363a985e7531bddd7be48a5e039a670e5acf748eedda
This commit is contained in:
drh 2023-07-05 15:34:30 +00:00
parent 1790ccb98b
commit 85ca6d7ace
3 changed files with 9 additions and 8 deletions
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@ -1,5 +1,5 @@
C Simplification\sof\sthe\sdekkerMul2()\ssubroutine.
D 2023-07-05T14:42:50.334
C Make\sthe\sorder\sof\soperations\sexplicit\sfor\sthe\serror\sterm\sof\sDekker\ndouble-precision\smultiply.
D 2023-07-05T15:34:30.576
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -705,7 +705,7 @@ F src/trigger.c ad6ab9452715fa9a8075442e15196022275b414b9141b566af8cdb7a1605f2b0
F src/update.c 0aa36561167a7c40d01163238c297297962f31a15a8d742216b3c37cdf25f731
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F src/util.c 04958d3937d7db7ae2d0ee18506c384596dfa909cc0c4a1347bf79081c107b5b
F src/util.c 059f3d7f7f1b893717c2878dc874dc870d6bae8e2f279dbd48770e08fbd4df00
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F src/vdbe.h 41485521f68e9437fdb7ec4a90f9d86ab294e9bb8281e33b235915e29122cfc0
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# Remove this line to create a well-formed Fossil manifest.

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28f57b34e6b11184a36e363a985e7531bddd7be48a5e039a670e5acf748eedda

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src/util.c
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@ -409,7 +409,8 @@ static void dekkerMul2(double *x, double y, double yy){
cc = p - c + q + tx*ty;
cc = x[0]*yy + x[1]*y + cc;
x[0] = c + cc;
x[1] = c - x[0] + cc;
x[1] = c - x[0];
x[1] += cc;
}
/*