CCS/MSP-CGT: Inefficient common BIC.B optimisation.

Tool/software: Code Composer Studio

Hi,

This issue isn't actually fixed in general.  The specific case I provide was resolved, but if you clear the same bit pattern from two (or more) bytes then the same de-optimisation occurs.  Consider:

extern unsigned char src, dst0, dst1;

void func(void)
{
    dst0 &= ~src;
    dst1 &= ~src;
}

This produces the following code:

;** 6   -----------------------    C$1 = src^0xff;
    .dwpsn  file "bic.c",line 6,column 5,is_stmt,isa 0
        MOV.B     &src+0,r15            ; [] |6| 
        XOR.W     #255,r15              ; [] |6| 
;** 6   -----------------------    dst0 &= C$1;
        AND.B     r15,&dst0+0           ; [] |6| 
;** 7   -----------------------    dst1 &= C$1;
    .dwpsn  file "bic.c",line 7,column 5,is_stmt,isa 0
        AND.B     r15,&dst1+0           ; [] |7| 
;**     -----------------------    return;