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From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/66956] [avr] Using 32*32=64 multiplicatiion (umulsidi3) for 32=32*32 without MUL.
Date: Tue, 21 Jul 2015 10:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66956

Georg-Johann Lay <gjl at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Compile that test case with

$ avr-gcc -Os mul32.c -S

Result is something like:

mul_u32:
        rcall __umulsidi3
        mov r22,r18
        mov r23,r19
        mov r24,r20
        mov r25,r21
        ret

mul_s32:
        rcall __mulsidi3
        mov r22,r18
        mov r23,r19
        mov r24,r20
        mov r25,r21
        ret