[PATCH] Fix emit_library_call_value to not use virtual stack regs after expand

[Maxim Kuvyrkov]

Hello,

The following simple patch [which is just a duplication of a hunk from 
within emit_library_call_value_1] fixes ICE when compiling for 
m68k/ColdFire machines without hardware divide.

The ICE occurs in reload on gcc.c-torture/execute/loop-3b.c test due to 
occurrence of virtual_outgoing_args_rtx in the instruction stream.  This 
virtual register is used within expand and then is substituted with 
(stack_pointer_rtx + STACK_POINTER_OFFSET) at the end of expand.

Evidently, there still remains a way to generate virtual_outgoing_args 
by the loop optimizer.  The loop optimizer emits a divide instruction 
which, due to target not having hwdiv, expands into a library call.

emit_library_call_value_1 deals with virtual_outgoing_args_rtx in two 
places: the first already handles case when virtuals are instantiated; 
this patch fixes the second.

Tested by bootstrapping on x86_64.  OK for trunk?

Thanks,

--
Maxim K.
CodeSourcery
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: gcc-virt-regs-fix.ChangeLog
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20090624/44203724/attachment.ksh>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: gcc-virt-regs-fix.patch
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20090624/44203724/attachment-0001.ksh>