[Bug target/35659] [4.3/4.4 Regression] Miscompiled code with -O2 (but not with -O2 -funroll-loops) on ia64

["mkuvyrkov at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #16 from mkuvyrkov at gcc dot gnu dot org  2008-06-25 21:33 -------
I can't reproduce the error with today mainline.  When I put in one file
'PROGRAM PR35659' and 'SUBROUTINE TLSC (A,B,AUX,IPIV,EPS,X)' and compile it
with any optimization level I get the same "STOP 0" message.  Am I doing
something wrong?

I can't spot the problem in the dumps you posted at debian.org.  tlsc.s has a
single example of data speculation which seems to be fine.  Scheduler
speculatively moves
        ld4.a r18 = [r44]
before
        st4 [r59] = r14, -60
and then also speculates several uses of r18:
        cmp4.ge p6, p7 = r22, r18
...
        (p7) ld4 r14 = [r62]
...
        (p7) st4 [r77] = r14
then it checks the speculation:
        chk.a.clr r18, .L69
and recovers if speculation failed:
.L69:
        .mmi
        ld4 r18 = [r44]
        ;;
        cmp4.ge p6, p7 = r22, r18
        nop 0
        ;;
        .mmi
        nop 0
        (p7) ld4 r14 = [r62]
        nop 0
        ;;
        .mib
        (p7) st4 [r77] = r14
        nop 0
        br .L70

Anyway, can you help me reproduce the issue, so I can take a closer look?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35659

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