Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Richard Biener
On Wed, Aug 30, 2017 at 2:36 AM, Michael Clark wrote: > Dear GCC folk, > > > # Issue Background > > We’re investigating an issue with redundant sign-extension instructions being > emitted with the riscv backend. Firstly I would like to state that riscv is > possibly a unique backend with respect

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Michael Clark
> On 30 Aug 2017, at 9:14 PM, Richard Biener wrote: > > On Wed, Aug 30, 2017 at 2:36 AM, Michael Clark wrote: >> Dear GCC folk, >> >> >> # Issue Background >> >> We’re investigating an issue with redundant sign-extension instructions >> being emitted with the riscv backend. Firstly I would

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Michael Clark
> On 30 Aug 2017, at 9:43 PM, Michael Clark wrote: > >>> diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c >>> index ce632ae..25dd70f 100644 >>> --- a/gcc/simplify-rtx.c >>> +++ b/gcc/simplify-rtx.c >>> @@ -1503,6 +1503,10 @@ simplify_unary_operation_1 (enum rtx_code code, >>> machine_mode m

Can we replace uses of vec with vec in the backwards threader?

2017-08-30 Thread Aldy Hernandez
Hi! I'm looking at tree-ssa-threadbackward.c, where we pass around a lot of "vec" pointers representing a path through a flow graph. I'm wondering why we use va_gc, when AFAICT, the paths are local to the pass, and we can easily free them with path.release() at the end of the pass. For that matt

Re: Can we replace uses of vec with vec in the backwards threader?

2017-08-30 Thread Richard Biener
On Wed, Aug 30, 2017 at 12:41 PM, Aldy Hernandez wrote: > Hi! > > I'm looking at tree-ssa-threadbackward.c, where we pass around a lot > of "vec" pointers representing a path through a > flow graph. > > I'm wondering why we use va_gc, when AFAICT, the paths are local to > the pass, and we can easi

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Richard Biener
On Wed, Aug 30, 2017 at 11:53 AM, Michael Clark wrote: > >> On 30 Aug 2017, at 9:43 PM, Michael Clark wrote: >> diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index ce632ae..25dd70f 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -1503,6 +1503,10 @@ simp

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Jeff Law
On 08/30/2017 06:52 AM, Richard Biener wrote: > On Wed, Aug 30, 2017 at 11:53 AM, Michael Clark wrote: >> >>> On 30 Aug 2017, at 9:43 PM, Michael Clark wrote: >>> > diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c > index ce632ae..25dd70f 100644 > --- a/gcc/simplify-rtx.c > ++

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Jeff Law
On 08/30/2017 12:34 AM, Michael Clark wrote: > >> On 30 Aug 2017, at 12:36 PM, Michael Clark wrote: >> >> Dear GCC folk, >> >> >> # Issue Background >> >> We’re investigating an issue with redundant sign-extension instructions >> being emitted with the riscv backend. Firstly I would like to stat

Re: Can we replace uses of vec with vec in the backwards threader?

2017-08-30 Thread Jeff Law
On 08/30/2017 04:41 AM, Aldy Hernandez wrote: > Hi! > > I'm looking at tree-ssa-threadbackward.c, where we pass around a lot > of "vec" pointers representing a path through a > flow graph. > > I'm wondering why we use va_gc, when AFAICT, the paths are local to > the pass, and we can easily free t

RE: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Matthew Fortune
Jeff Law writes: > On 08/30/2017 06:52 AM, Richard Biener wrote: > > On Wed, Aug 30, 2017 at 11:53 AM, Michael Clark > > wrote: > >> > >>> On 30 Aug 2017, at 9:43 PM, Michael Clark wrote: > >>> > > diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c > > index ce632ae..25dd70f 100644 >

gcc-6-20170830 is now available

2017-08-30 Thread gccadmin
Snapshot gcc-6-20170830 is now available on ftp://gcc.gnu.org/pub/gcc/snapshots/6-20170830/ and on various mirrors, see http://gcc.gnu.org/mirrors.html for details. This snapshot has been generated from the GCC 6 SVN branch with the following options: svn://gcc.gnu.org/svn/gcc/branches/gcc-6

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Michael Clark
> On 31 Aug 2017, at 7:20 AM, Matthew Fortune > wrote: > > Jeff Law writes: >> On 08/30/2017 06:52 AM, Richard Biener wrote: >>> On Wed, Aug 30, 2017 at 11:53 AM, Michael Clark >>> wrote: > On 30 Aug 2017, at 9:43 PM, Michael Clark wrote: > >>> diff --git a/gcc/simplify-r

Re: Redundant sign-extension instructions on RISC-V

2017-08-30 Thread Michael Clark
> On 31 Aug 2017, at 2:12 PM, Michael Clark wrote: > >> >> On 31 Aug 2017, at 7:20 AM, Matthew Fortune >> wrote: >> >> Jeff Law writes: >>> On 08/30/2017 06:52 AM, Richard Biener wrote: On Wed, Aug 30, 2017 at 11:53 AM, Michael Clark wrote: > >> On 30 Aug 2017, at 9:43