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8051 >> HI-TECH C PRO for the Silicon Labs 8051 MCU Family

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ganesh
Beta Tester

Reged: Jan 13 2008
Posts: 5
Loc: Tamilnadu, India

Why does constant propagation optimization depend upon the usage of variable
#63942 - Fri Jul 04 2008 05:52 AM Attachment (58 downloads)

The attached 'testConstantPropagationForGlobalVariablesModifiedInTwoFunctions.c' was derived from ocg-test.c downloaded from http://www.htsoft.com/Files/ocg-test.c

'testConstantPropagationForGlobalVariablesModifiedInTwoFunctions.c' was compiled using the command line options --chip=8051 --opt=all -S

On analyzing the output file 'testConstantPropagationForGlobalVariablesModifiedInTwoFunctions.as' we found that, global variables containing constant value, which have usage/ definition in another function, are not propagated to its references used in an expression.

Query: Why does constant propagation optimization depend upon the usage of variable?

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clyde
HI-TECH team member

Reged: Oct 16 2003
Posts: 633

Re: Why does constant propagation optimization depend upon the usage of variable [Re: ganesh]
#64102 - Sun Jul 06 2008 08:30 AM

We don't want to give away all our secrets!

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harrymc

Reged: Oct 04 2004
Posts: 4
Loc: Perth, Western Australia

Re: Why does constant propagation optimization depend upon the usage of variable [Re: clyde]
#64342 - Mon Jul 07 2008 08:08 AM

hehe

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