http://llvm.org/bugs/show_bug.cgi?id=4993
Summary: Assertion `Reg && "this is not a register!"' failed
during linux kernel building.
Product: new-bugs
Version: 2.5
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=3521)
--> (http://llvm.org/bugs/attachment.cgi?id=3521)
Preprocessed kernel file that causes fail.
I use llvm-gcc to build linux kernel of one of the latest version (2.6.30.5).
llvm-gcc can't process file drivers/acpi/sbshc.c and exit with assertion `Reg
&& "this is not a register!"'.
Preprocessed file drivers/acpi/sbshc.c is attached.
To process it command
llvm-gcc -c drivers_acpi_sbshc.i
is used.
Note that there's no such problem if you just remove one case from switch:
916c916
< return ({ typeof(per_cpu__current_task) ret__; switch
(sizeof(per_cpu__current_task)) { case 1: asm("mov" "b ""%%""gs"":%P" "1"",%0"
: "=q" (ret__) : "m" (per_cpu__current_task)); break; case 2: asm("mov" "w
""%%""gs"":%P" "1"",%0" : "=r" (ret__) : "m" (per_cpu__current_task)); break;
case 4: asm("mov" "l ""%%""gs"":%P" "1"",%0" : "=r" (ret__) : "m"
(per_cpu__current_task)); break; case 8: asm("mov" "q ""%%""gs"":%P" "1"",%0" :
"=r" (ret__) : "m" (per_cpu__current_task)); break; default:
__bad_percpu_size(); } ret__; });
---
> return ({ typeof(per_cpu__current_task) ret__; switch
> (sizeof(per_cpu__current_task)) { case 1: asm("mov" "b ""%%""gs"":%P"
> "1"",%0" : "=q" (ret__) : "m" (per_cpu__current_task)); break; case 2:
> asm("mov" "w ""%%""gs"":%P" "1"",%0" : "=r" (ret__) : "m"
> (per_cpu__current_task)); break; case 4: asm("mov" "l ""%%""gs"":%P" "1"",%0"
> : "=r" (ret__) : "m" (per_cpu__current_task)); break; default:
> __bad_percpu_size(); } ret__; });
So it seems that this problem is connected with this case expression.
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