ping
On Mon, May 24, 2021 at 12:56 PM Hongtao Liu <crazy...@gmail.com> wrote:
>
> Hi:
> This patch is about to Fold __builtin_ia32_pblendvb128 (a, b, c) as
> VEC_COND_EXPR (c < 0, b, a), similar for float version but with
> mask operand VIEW_CONVERT_EXPR to same sized integer vectype.
>
> After folding, blendv related patterns can be redefined as
> vec_merge since all elements of mask operand is either const0_rtx or
> constm1_rtx now. It could potentially enable more rtl optimizations.
>
> Besides, although there's no pblendv{d,q} instructions, backend can
> still define their patterns and generate blendv{ps,pd} instead.
>
> Bootstrap and regtested on x86_64-linux-gnu{-m32,}.
> Ok for trunk?
>
> gcc/ChangeLog:
>
> * config/i386/i386-builtin.def (IX86_BUILTIN_BLENDVPD256,
> IX86_BUILTIN_BLENDVPS256, IX86_BUILTIN_PBLENDVB256,
> IX86_BUILTIN_BLENDVPD, IX86_BUILTIN_BLENDVPS,
> IX86_BUILTIN_PBLENDVB128): Replace icode with
> CODE_FOR_nothing.
> * config/i386/i386-expand.c (ix86_expand_sse_movcc): Use
>
> gen_avx_blendvd256/gen_avx_blendvq256/gen_sse4_1_blendvd/gen_sse4_1_blendvq
> for V8SI/V4DI/V4SI/V2DImode.
> * config/i386/i386.c (ix86_gimple_fold_builtin): Fold blendv
> builtins.
> * config/i386/mmx.md (mmx_blendvps): Change to define_expand.
> (*mmx_blendvps): New pattern implemented as vec_merge.
> * config/i386/sse.md
> (<sse4_1>_blendv<ssemodesuffix><avxsizesuffix>): Change to
> define_expand.
> (<sse4_1_avx2>_pblendvb): Ditto.
> (*<sse4_1>_blendv<ssemodesuffix><avxsizesuffix>): New pattern
> implemented as vec_merge.
> (*<sse4_1_avx2>_pblendvb): Ditto.
> (*<sse4_1_avx2>_pblendvb_lt): Redefined as define_insn with
> pattern implemented as vec_merge instead of UNSPEC_BLENDV.
> (*<sse4_1>_blendv<ssemodesuffix><avxsizesuffix>_lt): Ditto,
> and extend mode to V48_AVX.
> (*<sse4_1_avx2>_pblendvb_not_lt): New.
> (*<sse4_1>_blendv<ssefltmodesuffix><avxsizesuffix>_ltint): Deleted.
> (*<sse4_1_avx2>_pblendvb_lt): Ditto.
> (*<sse4_1_avx2>_pblendvb_not_lt): Ditto.
>
> gcc/testsuite/ChangeLog:
>
> * gcc.target/i386/funcspec-8.c: Replace
> __builtin_ia32_blendvpd with __builtin_ia32_roundps_az.
> * gcc.target/i386/blendv-1.c: New test.
> * gcc.target/i386/blendv-2.c: New test.
>
>
> --
> BR,
> Hongtao
--
BR,
Hongtao
