Question about how to re-initialize call_used registers via init_regs()

Kai Tietz Kai.Tietz@onevision.com
Wed Dec 3 10:16:00 GMT 2008


Hi Honza,

Related to the problem 38366 me and M. Lankhorst (a wine developer), that 
you were right, that the registers %rsi and %rdi aren't saved for callabi 
switching by ms_abi functions calling sysv_abi. This is reasoned by the 
fact that the fndecl based conditional register usage macro (in i386.h) 
calls  init_regs (from regclass.c), which resets it back to the standard 
register usage, so this code is somehow meaning less at the moment.
I tried it by generate a init_regs_after method (like the init_regs in 
regclass.c), which simply does not reset back to the initial register 
usage set, and use it in the OVERRIDE_REGISTER_USAGE. But this seems to 
lead to bootstrap failures on linux64 targets. What way you would suggest 
to solve this problem?


Thanks in advance,
Kai

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