I am having problem downloading the patch file. Is it just me?
Sun
On Wed, May 25, 2011 at 4:45 PM, Hui Shi <kalin....@gmail.com> wrote:
> Hi, All
>
> Can gatekeeper help review this patch?
>
> For attached test case, in foo, *p reference is not alias with a in nystrom
> alias analysis.
> The problem is when creating alias tag, alias_tag points to blackhole is not
> updated correctly.
>
> Alias dump before fix.
> I4INTCONST 2 (0x2) {cgnode 1}
> I4STID 0 <1,51,a> T<4,.predef_I4,4> {line: 1/5} {cgnode 3}
> I4INTCONST 3 (0x3) {cgnode 1}
> U8U8LDID 0 <1,52,p> T<53,anon_ptr.,8> {cgnode 4}
> I4ISTORE 0 T<53,anon_ptr.,8> {line: 1/6} {cgnode 4} {alias_tag 2}
> I4I4LDID 0 <1,51,a> T<4,.predef_I4,4> {cgnode 3}
> I4STID 1 <1,5,.preg_I8> T<4,.predef_I4,4> # $r1 {line: 1/7} {cgnode 5}
> RETURN {line: 1/7}
>
> store to p's alias_tag 2 only points to black hole cg node.
> It will not alias with STID a (alias_tag 3), because alias_tag 2 not points
> to cg node 3.
> Dump result for alias tag.
>
> alias tag 2: points to cg nodes [2] // black hole
> alias tag 3: points to cg nodes [3] // a
> alias tag 5: points to cg nodes [4] // p
>
> Fix is,
> For non-ipa alias analysis, if alias tag points to black hole, make it
> points to all global and escaple local.
> If ipa can't find the points to, its a ipa analysis bug.
>
> after fix
> alias tag 2: points to cg nodes [2, 3, 4] // points to blackhole, a and p.
> alias tag 3: points to cg nodes [3]
> alias tag 4: points to cg nodes [2, 3, 4]
> alias tag 5: points to cg nodes [4]
>
> Regards
> Shi Hui
>
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