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Re: RFA: Allow widening multiplication in tree-ssa/slsr-8.c
- From: Richard Biener <richard dot guenther at gmail dot com>
- To: gcc-patches at gcc dot gnu dot org, rdsandiford at googlemail dot com
- Date: Mon, 14 Jan 2013 08:26:34 +0100
- Subject: Re: RFA: Allow widening multiplication in tree-ssa/slsr-8.c
- References: <874nilzctx.fsf@talisman.default>
On Sun, Jan 13, 2013 at 9:50 AM, Richard Sandiford
<rdsandiford@googlemail.com> wrote:
> gcc.dg/tree-ssa/slsr-8.c does "(int) index * (size_t) element_size",
> which on LP64 targets can use a widening multiplication. Of course,
> for simple element sizes like these, we end up using a shift instead,
> but that's a decision that's rightly made later.
>
> Tested on x86_64-linux-gnu, mips64-linux-gnu and mipsisa64-elf.
> OK to install?
Ok.
Thanks,
Richard.
> Richard
>
>
> gcc/testsuite/
> * gcc.dg/tree-ssa/slsr-8.c: Allow widening multiplications.
>
> Index: gcc/testsuite/gcc.dg/tree-ssa/slsr-8.c
> ===================================================================
> --- gcc/testsuite/gcc.dg/tree-ssa/slsr-8.c 2013-01-13 08:05:03.403375571 +0000
> +++ gcc/testsuite/gcc.dg/tree-ssa/slsr-8.c 2013-01-13 08:46:05.246550444 +0000
> @@ -18,6 +18,7 @@ f (int s, int *c)
> }
>
> /* There are 4 ' * ' instances in the decls (since "int * iftmp.0;" is
> - added), 1 parm, 2 in the code. */
> -/* { dg-final { scan-tree-dump-times " \\* " 7 "optimized" } } */
> + added), 1 parm, 2 in the code. The second one in the code can be
> + a widening mult. */
> +/* { dg-final { scan-tree-dump-times " w?\\* " 7 "optimized" } } */
> /* { dg-final { cleanup-tree-dump "optimized" } } */