http://llvm.org/bugs/show_bug.cgi?id=4777
Summary: msp430 backend: static function-scope variable at
specific address doesn't work
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
reg...@john-home:~/z/tinyos-2.x/apps/Null/build/telosb$ cat p1.c
unsigned char foo (unsigned char x)
{
static volatile unsigned char P1OUT __asm ("0x0021");
unsigned char tmp = P1OUT;
P1OUT = x;
return tmp;
}
reg...@john-home:~/z/tinyos-2.x/apps/Null/build/telosb$ clang -ccc-host-triple
msp430-generic-generic -ccc-clang-archs msp430 -x c -S -w -O2 p1.c
p1.c:3:26: error: cannot compile this __asm__ yet
volatile unsigned char P1OUT __asm ("0x0021");
^
1 diagnostic generated.
The emitted code should be identical to placing the register in file scope:
reg...@john-home:~/z/tinyos-2.x/apps/Null/build/telosb$ msp430-gcc -O p1.c -S
-o -
foo:
mov.b &0x0021, r14
mov.b r15, &0x0021
mov.b r14, r15
ret
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