<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>My program reads a xls file and creates a haskell program that does exactly the same as what the xls does. Every cell in the xls is a function and contains 2 lines: <o:p></o:p></p><p class=MsoNormal>the type declaration and 1 line the implementation. The type of a cell is XlsCell.<o:p></o:p></p><p class=MsoNormal>data XlsCell = Reader ExternalCells XlsCellRes<o:p></o:p></p><p class=MsoNormal>data XlsCellRes = XlsCellString String | XlsCellBool Bool | .....<o:p></o:p></p><p class=MsoNormal>type ExternalCells = Map String XlsCellRes -- search (or set) a value of a cell by its name.<o:p></o:p></p><p class=MsoNormal>The externalCells are for the cells you can change at runtime.<o:p></o:p></p><p class=MsoNormal>The generated program was first 30000 lines. When I compiled it with ghc 7.8.3. -O0 the program worked, but was terribly slow. With -O2 I got: out of memory.<o:p></o:p></p><p class=MsoNormal>With a few trics the generated code is now split up in 2 files 5000 and 10000 lines. I've upgraded to ghc 7.8.4. If I do ghc -O2 the program takes more then 4 hours <o:p></o:p></p><p class=MsoNormal>to compile. The –O2 compilation is essential. The resulting program is much (more then 10x) faster then without –O2.<o:p></o:p></p><p class=MsoNormal>What can I do (changes in the generated code, changes to speed up ghc?) to make ghc faster with -O2? I tried ghc-make, but it doesn't make a big difference.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Kees<o:p></o:p></p></div></body></html>