[Bug middle-end/19331] [4.0 Regression] Inefficient code generated for bitfield assignment

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-01-08 18:37 -------
Hmm, on PPC, the mainline produces much better code than 3.3.2.
3.3.2:
        lbz r6,69(r1)
        la r2,lo16(_params)(r7)
        lwz r3,48(r2)
        addi r1,r1,80
        rlwinm r5,r6,26,31,31
        rlwinm r4,r6,27,31,31
        rlwinm r0,r6,28,31,31
        rlwimi r3,r6,23,1,1
        rlwimi r3,r5,29,2,2
        rlwimi r3,r4,28,3,3
        rlwimi r3,r0,27,4,4
        stw r3,48(r2)

mainline:
        lwz r2,60(r1)
        lwz r0,48(r9)
        addi r1,r1,80
        rlwimi r0,r2,7,1,1
        rlwimi r0,r2,7,2,2
        rlwimi r0,r2,7,3,3
        rlwimi r0,r2,7,4,4
        stw r0,48(r9)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19331