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________________________________________ From: Dennis Zhang <dennis.zh...@arm.com> Sent: Tuesday, October 6, 2020 5:46 PM To: gcc-patches@gcc.gnu.org Cc: Kyrylo Tkachov; nd; Richard Earnshaw; Ramana Radhakrishnan Subject: Re: [PATCH][Arm] Auto-vectorization for MVE: vsub Hi all, On 8/17/20 6:41 PM, Dennis Zhang wrote: > > Hi all, > > This patch enables MVE vsub instructions for auto-vectorization. > It adds RTL templates for MVE vsub instructions using 'minus' instead of > unspec expression to make the instructions recognizable for vectorization. > MVE target is added in sub<mode>3 optab. The sub<mode>3 optab is > modified to use a mode iterator that selects available modes for various > targets correspondingly. > MVE vector modes are enabled in arm_preferred_simd_mode in arm.c to > support vectorization. > > This patch also fixes 'vreinterpretq_*.c' MVE intrinsic tests. The tests > generate wrong instruction numbers because of unexpected icf optimization. > This bug is exposed by the MVE vector modes enabled in this patch, > therefore it is corrected in this patch to avoid test failures. > > MVE instructions are documented here: > https://developer.arm.com/architectures/instruction-sets/simd-isas/helium/helium-intrinsics > > The patch is regtested for arm-none-eabi and bootstrapped for > arm-none-linux-gnueabihf. > > Is it OK for trunk please? > > Thanks > Dennis > > gcc/ChangeLog: > > 2020-08-10 Dennis Zhang <dennis.zh...@arm.com> > > * config/arm/arm.c (arm_preferred_simd_mode): Enable MVE vector modes. > * config/arm/arm.h (TARGET_NEON_IWMMXT): New macro. > (TARGET_NEON_IWMMXT_MVE, TARGET_NEON_IWMMXT_MVE_FP): Likewise. > (TARGET_NEON_MVE_HFP): Likewise. > * config/arm/iterators.md (VSEL): New mode iterator to select modes > for corresponding targets. > * config/arm/mve.md (mve_vsubq<mode>): New entry for vsub instruction > using expression 'minus'. > (mve_vsubq_f<mode>): Use minus instead of VSUBQ_F unspec. > * config/arm/neon.md (sub<mode>3): Removed here. Integrated in the > sub<mode>3 in vec-common.md > * config/arm/vec-common.md (sub<mode>3): Enable MVE target. Use VSEL > to select available modes. Exclude TARGET_NEON_FP16INST from > TARGET_NEON statement. Intergrate TARGET_NEON_FP16INST which is > originally in neon.md. > > gcc/testsuite/ChangeLog: > > 2020-08-10 Dennis Zhang <dennis.zh...@arm.com> > > * gcc.target/arm/mve/intrinsics/vreinterpretq_f16.c: Use additional > option -fno-ipa-icf and change the instruction count from 8 to 16. > * gcc.target/arm/mve/intrinsics/vreinterpretq_f32.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_s16.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_s32.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_s64.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_s8.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_u16.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_u32.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_u64.c: Likewise. > * gcc.target/arm/mve/intrinsics/vreinterpretq_u8.c: Likewise. > * gcc.target/arm/mve/mve.exp: Include tests in subdir 'vect'. > * gcc.target/arm/mve/vect/vect_sub_0.c: New test. > * gcc.target/arm/mve/vect/vect_sub_1.c: New test. > This patch is updated based on Richard Sandiford's patch adding new vector mode macros: https://gcc.gnu.org/pipermail/gcc-patches/2020-September/553425.html The old version of this patch is at https://gcc.gnu.org/pipermail/gcc-patches/2020-August/552104.html And a less related part in the old version is separated into another patch: https://gcc.gnu.org/pipermail/gcc-patches/2020-September/554100.html This patch enables MVE vsub instructions for auto-vectorization. It adds insns for MVE vsub instructions using 'minus' instead of unspec expression to make the instructions recognizable for auto-vectorization. The sub<mode>3 in mve.md is modified to use new mode macros which make the expander available when certain modes are supported. Then various targets can share this expander for vectorization. The redundant sub<mode>3 insns in neon.md are then removed. Regression tested on arm-none-eabi and bootstraped on arm-none-linux-gnueabihf. Is it OK for trunk please? Thanks Dennis gcc/ChangeLog: 2020-10-02 Dennis Zhang <dennis.zh...@arm.com> * config/arm/mve.md (mve_vsubq<mode>): New entry for vsub instruction using expression 'minus'. (mve_vsubq_f<mode>): Use minus instead of VSUBQ_F unspec. * config/arm/neon.md (*sub<mode>3_neon): Use the new mode macros ARM_HAVE_<MODE>_ARITH. (sub<mode>3, sub<mode>3_fp16): Removed. (neon_vsub<mode>): Use gen_sub<mode>3 instead of gen_sub<mode>3_fp16. * config/arm/vec-common.md (sub<mode>3): Use the new mode macros ARM_HAVE_<MODE>_ARITH. gcc/testsuite/ChangeLog: 2020-10-02 Dennis Zhang <dennis.zh...@arm.com> * gcc.target/arm/simd/mve-vsub_1.c: New test.
