On Wed, Apr 24, 2019 at 9:36 AM Jakub Jelinek <ja...@redhat.com> wrote:
> Hi!
>
> ix86_expand_sse_fp_minmax bypasses the expanders and so might end up with
> both if_true and if_false being a MEM, which violates the condition of the
> insn it wants to match.
>
> The following patch makes sure at most one of the operands is a MEM.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
>
> 2019-04-24 Jakub Jelinek <ja...@redhat.com>
>
> PR target/90187
> * config/i386/i386.c (ix86_expand_sse_fp_minmax): Force if_true
> into
> a register if both if_true and if_false are MEMs.
>
> * g++.target/i386/pr90187.C: New test.
>
OK.
Thanks,
Uros.
--- gcc/config/i386/i386.c.jj 2019-04-16 10:40:15.077091789 +0200
> +++ gcc/config/i386/i386.c 2019-04-23 11:42:32.088334896 +0200
> @@ -23712,6 +23712,8 @@ ix86_expand_sse_fp_minmax (rtx dest, enu
> else
> {
> code = is_min ? SMIN : SMAX;
> + if (MEM_P (if_true) && MEM_P (if_false))
> + if_true = force_reg (mode, if_true);
> tmp = gen_rtx_fmt_ee (code, mode, if_true, if_false);
> }
>
> --- gcc/testsuite/g++.target/i386/pr90187.C.jj 2019-04-23
> 11:42:51.175025002 +0200
> +++ gcc/testsuite/g++.target/i386/pr90187.C 2019-04-23
> 11:41:56.405914260 +0200
> @@ -0,0 +1,15 @@
> +// PR target/90187
> +// { dg-do compile }
> +// { dg-options "-Ofast -ffloat-store" }
> +
> +double a[64];
> +double *foo (void);
> +
> +void
> +bar (int x, const double *y)
> +{
> + int i;
> + for (i = 0; i < x; i++)
> + if (y[i] < a[i])
> + a[i] = y[i];
> +}
>
> Jakub
>
