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Saxon optimization
Added by Anonymous about 18 years ago
Legacy ID: #3585466
Legacy Poster: philippe drix (ph-d)
Hi, Let us consider this XSLT skeleton : template begin xslt instructions ... call
template 1 template 1 xslt instructions ... call template 2 template 2 xslt instructions
... call template 3 template i xslt instructions ... call template i+1 ... All the
"call template" instruction are the last instruction of the template.
I wonder if saxon compiler sees that this skeleton may be optimized like this : template
begin xslt instructions ... call template 1 call template 2 call template 3 ... call
template i ... template 1 xslt instructions ... template 2 xslt instructions ...
template i xslt instructions ... ... Regards -- Ph D
Legacy ID: #3586160
Legacy Poster: Michael Kay (mhkay)
Yes, Saxon implements tail-call optimization for template calls, so if the last
thing in a template is a call-template instruction, the stack will be popped before
executing the call-template rather than after. This is intended to benefit deeply
recursive calls, but it's done whether or not the call is recursive. Michael Kay
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