http://llvm.org/bugs/show_bug.cgi?id=4776
Summary: msp430 backend: placing a variable at a specific address
doesn't seem to 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], [email protected]
Consider this code:
volatile unsigned char P1OUT __asm ("0x0021");
unsigned char foo (unsigned char x)
{
unsigned char tmp = P1OUT;
P1OUT = x;
return tmp;
}
Using mspgcc...
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
However using clang...
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 -o -
foo:
push.w r4
mov.w r1, r4
mov.b r15, r12
mov.b &_30_x0021, r15
mov.b r12, &_30_x0021
pop.w r4
ret
Perhaps this is just a typo in the emitted code? It looks almost correct.
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