On 22 November 2017 at 09:44, Richard Biener <rguent...@suse.de> wrote:
>
> The following fixes if-conversion to free SCEV/niter estimates because
> it DCEs stmts.
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
>
> Richard.
>
> 2017-11-22 Richard Biener <rguent...@suse.de>
>
> PR tree-optimization/83089
> * tree-if-conv.c (pass_if_conversion::execute): If anything
> changed reset SCEV and free the number of iteration estimates.
>
> * gcc.dg/pr83089.c: New testcase.
>
> Index: gcc/tree-if-conv.c
> ===================================================================
> --- gcc/tree-if-conv.c (revision 254990)
> +++ gcc/tree-if-conv.c (working copy)
> @@ -2959,6 +2959,12 @@ pass_if_conversion::execute (function *f
> && !loop->dont_vectorize))
> todo |= tree_if_conversion (loop);
>
> + if (todo)
> + {
> + free_numbers_of_iterations_estimates (fun);
> + scev_reset ();
> + }
> +
> if (flag_checking)
> {
> basic_block bb;
> Index: gcc/testsuite/gcc.dg/pr83089.c
> ===================================================================
> --- gcc/testsuite/gcc.dg/pr83089.c (nonexistent)
> +++ gcc/testsuite/gcc.dg/pr83089.c (working copy)
> @@ -0,0 +1,27 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -ftree-loop-if-convert -ftree-parallelize-loops=2" } */
> +
> +int rl, s8;
> +
> +void
> +it (int zy, short int el)
> +{
> + int hb;
> +
> + while (el != 0)
> + {
> + hb = el;
> + for (rl = 0; rl < 200; ++rl)
> + {
> + for (s8 = 0; s8 < 2; ++s8)
> + {
> + }
> + if (s8 < 3)
> + zy = hb;
> + if (hb == 0)
> + ++s8;
> + zy += (s8 != -1);
> + }
> + el = zy;
> + }
> +}
I see the new testcase failing to compile on bare-metal targets
(aarch64-elf, arm-eabi):
spawn -ignore SIGHUP
/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/gcc/xgcc
-B/aci-gcc-fsf/builds/gcc-fsf-gccsrc/obj-aarch64-none-elf/gcc3/gcc/
/gcc/testsuite/gcc.dg/pr83089.c -fno-diagnostics-show-caret
-fdiagnostics-color=never -O2 -ftree-loop-if-convert
-ftree-parallelize-loops=2 -S -specs=aem-ve.specs -o pr83089.s
xgcc: error: unrecognized command line option '-pthread'
compiler exited with status 1
FAIL: gcc.dg/pr83089.c (test for excess errors)
Where does that -pthread come from?
