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assembler function inlining

Function inlining replaces a call to a function with the body of the function. This speeds up program execution by eliminating the call/return code, the code required to pass parameters, and the code required for return values.

But how to asign the __inline switch to my assembler function:

//*********************************************************************
// 32*32 bit signed/unsigned multiply in ARM Assembler
// Returns 64 bit result in R0,R1
//*********************************************************************
AREA ?C?bla, CODE, READONLY, ALIGN=2

PUBLIC S_MUL32x32?A
S_MUL32x32?A            PROC CODE32

                SMULL   R2,R0,R1,R0                     ; R0,R2 := R1*R0
                mov     R1,R2
                bx      lr
                ENDP

PUBLIC U_MUL32x32?A
U_MUL32x32?A            PROC CODE32

                UMULL   R2,R0,R1,R0                     ; R0,R2 := R1*R0
                mov     R1,R2
                bx      lr
                ENDP

                END
//*********************************************************************

In the following function declarations the "__inline" switch does not have an effect:

extern __inline unsigned long long U_MUL32x32(unsigned int,unsigned int);
extern __inline unsigned long long S_MUL32x32(unsigned int,unsigned int);

Parents

0 Dieter Coba over 19 years ago

Sorry i must say Please read the manual to myself :-)

Some restrictions apply to the __inline attribute. As such, function inlining is disabled for:

functions that return a struct or union or have a parameter of the type struct or union.

my union:

//***************************************************************************
union xyz
{
        unsigned int i[2];
        unsigned long long l;
};
//***************************************************************************

my function call:

                union xyz zz;
                zz.l=U_MUL32x32(0x88888888,0x11111111);
                printf("%#.8X ",zz.i[0]);
                printf("%#.8X\n",zz.i[1]);

                zz.l=S_MUL32x32(0x88888888,0x11111111);
                printf("%#.8X ",zz.i[0]);
                printf("%#.8X\n",zz.i[1]);

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