[Bug c/27308] Compiler generates incorrect code when calling a function with the result of an inline function as parameter

[rguenth at gcc dot gnu dot org]

--- Comment #1 from rguenth at gcc dot gnu dot org  2006-04-25 12:38 ---
*** Bug 27305 has been marked as a duplicate of this bug. ***


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27308

[Bug c/27308] Compiler generates incorrect code when calling a function with the result of an inline function as parameter

[rguenth at gcc dot gnu dot org]

--- Comment #2 from rguenth at gcc dot gnu dot org  2006-04-25 12:49 ---
This is probably a problem with the inline asm constraints.  Try removing the
__asm__(r0) from the __res variable.  Also try simplifying the testcase by
storing the result of BIOS_ContainerUsage(1) to memory rather than calling
printf.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27308

[Bug c/27308] Compiler generates incorrect code when calling a function with the result of an inline function as parameter

[Eric dot Doenges at betty-tv dot com]

--- Comment #3 from Eric dot Doenges at betty-tv dot com  2006-04-25 14:37 
---
Storing the result to memory generates correct code


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27308

[Bug c/27308] Compiler generates incorrect code when calling a function with the result of an inline function as parameter

[Eric dot Doenges at betty-tv dot com]

--- Comment #4 from Eric dot Doenges at betty-tv dot com  2006-04-25 14:43 
---
Removing the __asm__ (r0) from __res works around the bug - but then I cannot
depend on gcc
always allocating r0 for __res, can I ? I found no other way to tell gcc which
registers it must use.
I'm assuming this is a bug in gcc, not the asm constraint, because the same
code works flawlessly with
gcc-3.4.3.

As to simplifying the testcase - storing the result of BIOS_ContainerUsage to
memory generates correct
code regardless of wether __res is forced to r0 or not, making it worthless as
a test case.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27308

[Bug c/27308] Compiler generates incorrect code when calling a function with the result of an inline function as parameter

[rguenth at gcc dot gnu dot org]

--- Comment #5 from rguenth at gcc dot gnu dot org  2006-04-25 15:45 ---
__res should be allocated to the same register as __r0 due to the '0'
constraint which tells gcc to use the same register as for =r (__res). 
Whoops - I obviously meant to remove the __asm__(r0) from the __r0
variable...  But maybe it works vice-versa, too.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27308