Re: [PATCH] Look through clobber stmts in uninit (PR tree-optimization/79345)

2017-02-22 Thread Richard Biener
On Tue, 21 Feb 2017, Jeff Law wrote: > On 02/21/2017 02:01 AM, Richard Biener wrote: > > On Mon, 20 Feb 2017, Marc Glisse wrote: > > > > > On Mon, 20 Feb 2017, Jakub Jelinek wrote: > > > > > > > As mentioned by Jason in the PR, we've regressed on the following > > > > testcase > > > > since we s

Re: [PATCH] Look through clobber stmts in uninit (PR tree-optimization/79345)

2017-02-21 Thread Jeff Law
On 02/21/2017 02:01 AM, Richard Biener wrote: On Mon, 20 Feb 2017, Marc Glisse wrote: On Mon, 20 Feb 2017, Jakub Jelinek wrote: As mentioned by Jason in the PR, we've regressed on the following testcase since we started emitting CLOBBERs at the start of ctors (and we warn as before with -fno-

Re: [PATCH] Look through clobber stmts in uninit (PR tree-optimization/79345)

2017-02-21 Thread Richard Biener
On Mon, 20 Feb 2017, Marc Glisse wrote: > On Mon, 20 Feb 2017, Jakub Jelinek wrote: > > > As mentioned by Jason in the PR, we've regressed on the following testcase > > since we started emitting CLOBBERs at the start of ctors (and we warn as > > before with -fno-lifetime-dse -Wuninitialized). > >

Re: [PATCH] Look through clobber stmts in uninit (PR tree-optimization/79345)

2017-02-21 Thread Richard Biener
On Mon, 20 Feb 2017, Jakub Jelinek wrote: > Hi! > > As mentioned by Jason in the PR, we've regressed on the following testcase > since we started emitting CLOBBERs at the start of ctors (and we warn as > before with -fno-lifetime-dse -Wuninitialized). > With -fno-lifetime-dse, the vuse on the b.x

Re: [PATCH] Look through clobber stmts in uninit (PR tree-optimization/79345)

2017-02-20 Thread Marc Glisse
On Mon, 20 Feb 2017, Jakub Jelinek wrote: As mentioned by Jason in the PR, we've regressed on the following testcase since we started emitting CLOBBERs at the start of ctors (and we warn as before with -fno-lifetime-dse -Wuninitialized). With -fno-lifetime-dse, the vuse on the b.x read stmt is d

[PATCH] Look through clobber stmts in uninit (PR tree-optimization/79345)

2017-02-20 Thread Jakub Jelinek
Hi! As mentioned by Jason in the PR, we've regressed on the following testcase since we started emitting CLOBBERs at the start of ctors (and we warn as before with -fno-lifetime-dse -Wuninitialized). With -fno-lifetime-dse, the vuse on the b.x read stmt is default def and thus we warn, but if ther