On Fri, Sep 17, 2021 at 5:15 AM Cui, Lili <lili....@intel.com> wrote:
>
>
> > -----Original Message-----
> > From: Uros Bizjak <ubiz...@gmail.com>
> > Sent: Thursday, September 16, 2021 2:28 PM
> > To: Cui, Lili <lili....@intel.com>
> > Cc: gcc-patches@gcc.gnu.org; Liu, Hongtao <hongtao....@intel.com>; H. J. Lu
> > <hjl.to...@gmail.com>
> > Subject: Re: [PATCH 3/4] [PATCH 3/4] x86: Properly handle
> > USE_VECTOR_FP_CONVERTS/USE_VECTOR_CONVERTS
> >
> > On Wed, Sep 15, 2021 at 10:10 AM <lili....@intel.com> wrote:
> > >
> > > From: "H.J. Lu" <hjl.to...@gmail.com>
> > >
> > > Check TARGET_USE_VECTOR_FP_CONVERTS or
> > TARGET_USE_VECTOR_CONVERTS when
> > > handling avx_partial_xmm_update attribute. Don't convert AVX partial
> > > XMM register update if vector packed SSE conversion should be used.
> > >
> > > gcc/
> > >
> > > PR target/101900
> > > * config/i386/i386-features.c (remove_partial_avx_dependency):
> > > Check TARGET_USE_VECTOR_FP_CONVERTS and
> > TARGET_USE_VECTOR_CONVERTS
> > > before generating vxorps.
> > >
> > > gcc/
> > >
> > > PR target/101900
> > > * testsuite/gcc.target/i386/pr101900-1.c: New test.
> > > * testsuite/gcc.target/i386/pr101900-2.c: Likewise.
> > > * testsuite/gcc.target/i386/pr101900-3.c: Likewise.
> > > ---
> > > gcc/config/i386/i386-features.c | 21 ++++++++++++++++++---
> > > gcc/testsuite/gcc.target/i386/pr101900-1.c | 18 ++++++++++++++++++
> > > gcc/testsuite/gcc.target/i386/pr101900-2.c | 18 ++++++++++++++++++
> > > gcc/testsuite/gcc.target/i386/pr101900-3.c | 19 +++++++++++++++++++
> > > 4 files changed, 73 insertions(+), 3 deletions(-) create mode 100644
> > > gcc/testsuite/gcc.target/i386/pr101900-1.c
> > > create mode 100644 gcc/testsuite/gcc.target/i386/pr101900-2.c
> > > create mode 100644 gcc/testsuite/gcc.target/i386/pr101900-3.c
> > >
> > > diff --git a/gcc/config/i386/i386-features.c
> > > b/gcc/config/i386/i386-features.c index 5a99ea7c046..ae5ea02a002
> > > 100644
> > > --- a/gcc/config/i386/i386-features.c
> > > +++ b/gcc/config/i386/i386-features.c
> > > @@ -2210,15 +2210,30 @@ remove_partial_avx_dependency (void)
> > > != AVX_PARTIAL_XMM_UPDATE_TRUE)
> > > continue;
> > >
> > > - if (!v4sf_const0)
> > > - v4sf_const0 = gen_reg_rtx (V4SFmode);
> > > -
> > > /* Convert PARTIAL_XMM_UPDATE_TRUE insns, DF -> SF, SF -> DF,
> > > SI -> SF, SI -> DF, DI -> SF, DI -> DF, to vec_dup and
> > > vec_merge with subreg. */
> > > rtx src = SET_SRC (set);
> > > rtx dest = SET_DEST (set);
> > > machine_mode dest_mode = GET_MODE (dest);
> > > + machine_mode src_mode;
> > > +
> > > + if (TARGET_USE_VECTOR_FP_CONVERTS)
> > > + {
> > > + src_mode = GET_MODE (XEXP (src, 0));
> > > + if (src_mode == E_SFmode || src_mode == E_DFmode)
> > > + continue;
> > > + }
> > > +
> > > + if (TARGET_USE_VECTOR_CONVERTS)
> > > + {
> > > + src_mode = GET_MODE (XEXP (src, 0));
> > > + if (src_mode == E_SImode || src_mode == E_DImode)
> > > + continue;
> > > + }
> > > +
> > > + if (!v4sf_const0)
> > > + v4sf_const0 = gen_reg_rtx (V4SFmode);
> >
> > Please better move initialization of src_mode to the top of the new hunk,
> > like:
> >
> > machine_mode src_mode = GET_MODE (XEXP (src, 0)); switch (src_mode) {
> > case E_SFmode:
> > case E_DFmode:
> > if (TARGET_USE_VECTOR_FP_CONVERTS)
> > continue;
> > break;
> > case E_SImode:
> > case E_DImode:
> > if (TARGET_USE_VECTOR_CONVERTS)
> > continue;
> > break;
> > default:
> > break;
> > }
> >
> > or something like the above.
>
> Done, thanks for your good advice, I also rebased patch 4/4, since it is
> based on patch 3/4.
OK.
Thanks,
Uros.
>
> Changed it to:
>
> + machine_mode src_mode = GET_MODE (XEXP (src, 0));
> +
> + switch (src_mode)
> + {
> + case E_SFmode:
> + case E_DFmode:
> + if (TARGET_USE_VECTOR_FP_CONVERTS)
> + continue;
> + break;
> + case E_SImode:
> + case E_DImode:
> + if (TARGET_USE_VECTOR_CONVERTS)
> + continue;
> + break;
> + default:
> + break;
> + }
> + if (!v4sf_const0)
> + v4sf_const0 = gen_reg_rtx (V4SFmode);
>
> Thanks,
> Lili.
>
> >
> > Uros.
> >
> > >
> > > rtx zero;
> > > machine_mode dest_vecmode;
> > > diff --git a/gcc/testsuite/gcc.target/i386/pr101900-1.c
> > > b/gcc/testsuite/gcc.target/i386/pr101900-1.c
> > > new file mode 100644
> > > index 00000000000..0a45f8e340a
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.target/i386/pr101900-1.c
> > > @@ -0,0 +1,18 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-options "-O2 -march=skylake -mfpmath=sse
> > > +-mtune-ctrl=use_vector_fp_converts" } */
> > > +
> > > +extern float f;
> > > +extern double d;
> > > +extern int i;
> > > +
> > > +void
> > > +foo (void)
> > > +{
> > > + d = f;
> > > + f = i;
> > > +}
> > > +
> > > +/* { dg-final { scan-assembler "vcvtps2pd" } } */
> > > +/* { dg-final { scan-assembler "vcvtsi2ssl" } } */
> > > +/* { dg-final { scan-assembler-not "vcvtss2sd" } } */
> > > +/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 1 }
> > > +} */
> > > diff --git a/gcc/testsuite/gcc.target/i386/pr101900-2.c
> > > b/gcc/testsuite/gcc.target/i386/pr101900-2.c
> > > new file mode 100644
> > > index 00000000000..c8b2d1da5ae
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.target/i386/pr101900-2.c
> > > @@ -0,0 +1,18 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-options "-O2 -march=skylake -mfpmath=sse
> > > +-mtune-ctrl=use_vector_converts" } */
> > > +
> > > +extern float f;
> > > +extern double d;
> > > +extern int i;
> > > +
> > > +void
> > > +foo (void)
> > > +{
> > > + d = f;
> > > + f = i;
> > > +}
> > > +
> > > +/* { dg-final { scan-assembler "vcvtss2sd" } } */
> > > +/* { dg-final { scan-assembler "vcvtdq2ps" } } */
> > > +/* { dg-final { scan-assembler-not "vcvtsi2ssl" } } */
> > > +/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 1 }
> > > +} */
> > > diff --git a/gcc/testsuite/gcc.target/i386/pr101900-3.c
> > > b/gcc/testsuite/gcc.target/i386/pr101900-3.c
> > > new file mode 100644
> > > index 00000000000..6ee565b5bd4
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.target/i386/pr101900-3.c
> > > @@ -0,0 +1,19 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-options "-O2 -march=skylake -mfpmath=sse
> > > +-mtune-ctrl=use_vector_fp_converts,use_vector_converts" } */
> > > +
> > > +extern float f;
> > > +extern double d;
> > > +extern int i;
> > > +
> > > +void
> > > +foo (void)
> > > +{
> > > + d = f;
> > > + f = i;
> > > +}
> > > +
> > > +/* { dg-final { scan-assembler "vcvtps2pd" } } */
> > > +/* { dg-final { scan-assembler "vcvtdq2ps" } } */
> > > +/* { dg-final { scan-assembler-not "vcvtss2sd" } } */
> > > +/* { dg-final { scan-assembler-not "vcvtsi2ssl" } } */
> > > +/* { dg-final { scan-assembler-not "vxorps" } } */
> > > --
> > > 2.17.1
> > >
