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[avr-gcc-list] Re: Bizarre inlining type promotion effect

From: Shaun Jackman
Subject: [avr-gcc-list] Re: Bizarre inlining type promotion effect
Date: Mon, 4 Dec 2006 17:00:29 -0700

On 12/4/06, Shaun Jackman <address@hidden> wrote:
In the code snippet below, the function mul_8_8 compiles to use
exactly one `mul' instruction on the AVR. The function mul_16_8 calls
mul_8_8 twice. If mul_8_8 is a static inline function and inlined in

For comparison, a hand-coded 16x8 multiply function requires 11 instructions.


        mul r25, r22
        mov r23, r0
        mov r25, r1
        mul r24, r22
        eor r24, r24
        mov r22, r0
        add r23, r1
        adc r24, r25
        eor r25, r25
        eor r1, r1

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