[Bug target/14255] i386 backend should be teached how to use divl

[zack at codesourcery dot com]

------- Additional Comments From zack at codesourcery dot com  2004-02-23 17:10 -------
Subject: Re:  New: i386 backend should be teached
 how to use divl

"bernie at develer dot com" <gcc-bugzilla@gcc.gnu.org> writes:

> When dividing a 64bit integer by a 32bit integer,
> GCC promotes everything to 64bits and generates
> dumb code calling *both* __divdi3 and __moddi3.

This ought to be addressable with a pattern of the form

  (parallel [
    (set (reg:SI quo)
         (truncate:SI (div:DI  (reg:DI dividend)
                               (zero_extend:DI (reg:SI divisor)))))
    (set (reg:SI rem)
         (truncate:SI (mod:DI  (reg:DI dividend)
                               (zero_extend:DI (reg:SI divisor)))))
    ])

but I am not sure where it goes in i386.md.

zw


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14255