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Sorry for this other message but even if I thougth to have solved the
problem , the problem is still present. Now it seems that sub instruction doesn't set carry (borrow) bit . For example: /* SIMPLE SUBTRACTION WITH BORROW */ op1=5; op2=6; asm volatile("sub %2,%1 \n\t" "jc .Lcarry1%= \n\t" "mov #0,%0 \n\t" "jmp .Lexiting%= \n\t" ".Lcarry1%=: mov #1,%0 \n\t" ".Lexiting%=: nop \n\t" : "=r"(borrow) : "r"(op1) , "r"(op2) ); This simple code simply does a subtraction (5-6) (op1 and op2 are uint16_t variables). The result is correct (65535 or 0xFFFF) but the carry bit is 0 instead of 1 ! SubC has the same behavour . |
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