On Wed, Mar 16, 2022 at 9:18 AM liuhongt via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> __builtin_ia32_blendvpd is defined under sse4.1 and gimple folded
> to ((v2di) c) < 0 ? b : a where vec_cmpv2di is under sse4.2 w/o which
> it's veclowered to scalar operations and not combined back in rtl.
>
> Bootstrap and regtest on x86_64-pc-linux-gnu{-m32,}.
> Ready push to main trunk.
OK.
Richard.
> gcc/ChangeLog:
>
> PR target/104946
> * config/i386/i386-builtin.def (BDESC): Add
> CODE_FOR_sse4_1_blendvpd for IX86_BUILTIN_BLENDVPD.
> * config/i386/i386.cc (ix86_gimple_fold_builtin): Don't fold
> __builtin_ia32_blendvpd w/o sse4.2
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/i386/sse4_1-blendvpd-1.c: New test.
> ---
> gcc/config/i386/i386-builtin.def | 2 +-
> gcc/config/i386/i386.cc | 8 +++++++-
> gcc/testsuite/gcc.target/i386/sse4_1-blendvpd-1.c | 11 +++++++++++
> 3 files changed, 19 insertions(+), 2 deletions(-)
> create mode 100644 gcc/testsuite/gcc.target/i386/sse4_1-blendvpd-1.c
>
> diff --git a/gcc/config/i386/i386-builtin.def
> b/gcc/config/i386/i386-builtin.def
> index ea327555639..b410102614d 100644
> --- a/gcc/config/i386/i386-builtin.def
> +++ b/gcc/config/i386/i386-builtin.def
> @@ -906,7 +906,7 @@ BDESC (OPTION_MASK_ISA_SSSE3 | OPTION_MASK_ISA_MMX, 0,
> CODE_FOR_ssse3_palignrdi,
> /* SSE4.1 */
> BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_sse4_1_blendpd,
> "__builtin_ia32_blendpd", IX86_BUILTIN_BLENDPD, UNKNOWN, (int)
> V2DF_FTYPE_V2DF_V2DF_INT)
> BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_sse4_1_blendps,
> "__builtin_ia32_blendps", IX86_BUILTIN_BLENDPS, UNKNOWN, (int)
> V4SF_FTYPE_V4SF_V4SF_INT)
> -BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_nothing,
> "__builtin_ia32_blendvpd", IX86_BUILTIN_BLENDVPD, UNKNOWN, (int)
> V2DF_FTYPE_V2DF_V2DF_V2DF)
> +BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_sse4_1_blendvpd,
> "__builtin_ia32_blendvpd", IX86_BUILTIN_BLENDVPD, UNKNOWN, (int)
> V2DF_FTYPE_V2DF_V2DF_V2DF)
> BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_nothing,
> "__builtin_ia32_blendvps", IX86_BUILTIN_BLENDVPS, UNKNOWN, (int)
> V4SF_FTYPE_V4SF_V4SF_V4SF)
> BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_sse4_1_dppd,
> "__builtin_ia32_dppd", IX86_BUILTIN_DPPD, UNKNOWN, (int)
> V2DF_FTYPE_V2DF_V2DF_INT)
> BDESC (OPTION_MASK_ISA_SSE4_1, 0, CODE_FOR_sse4_1_dpps,
> "__builtin_ia32_dpps", IX86_BUILTIN_DPPS, UNKNOWN, (int)
> V4SF_FTYPE_V4SF_V4SF_INT)
> diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
> index d77ad83e437..5a561966eb4 100644
> --- a/gcc/config/i386/i386.cc
> +++ b/gcc/config/i386/i386.cc
> @@ -18368,10 +18368,16 @@ ix86_gimple_fold_builtin (gimple_stmt_iterator *gsi)
> }
> break;
>
> + case IX86_BUILTIN_BLENDVPD:
> + /* blendvpd is under sse4.1 but pcmpgtq is under sse4.2,
> + w/o sse4.2, it's veclowered to scalar operations and
> + not combined back. */
> + if (!TARGET_SSE4_2)
> + break;
> + /* FALLTHRU. */
> case IX86_BUILTIN_PBLENDVB128:
> case IX86_BUILTIN_PBLENDVB256:
> case IX86_BUILTIN_BLENDVPS:
> - case IX86_BUILTIN_BLENDVPD:
> case IX86_BUILTIN_BLENDVPS256:
> case IX86_BUILTIN_BLENDVPD256:
> gcc_assert (n_args == 3);
> diff --git a/gcc/testsuite/gcc.target/i386/sse4_1-blendvpd-1.c
> b/gcc/testsuite/gcc.target/i386/sse4_1-blendvpd-1.c
> new file mode 100644
> index 00000000000..c25d3fbcbd4
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/sse4_1-blendvpd-1.c
> @@ -0,0 +1,11 @@
> +/* { dg-do compile } */
> +/* { dg-options "-msse4.1 -O2 -mno-sse4.2" } */
> +/* { dg-final { scan-assembler-times {(?n)blendvpd[ \t]+%xmm[0-9]+} 1 } } */
> +
> +#include <immintrin.h>
> +
> +__m128d
> +foo (__m128d a, __m128d b, __m128d c)
> +{
> + return _mm_blendv_pd (a, b, c);
> +}
> --
> 2.18.1
>
