[00/13] Saturating arithmetic matching improvements

Message ID	20260902145254.77832-1-ktkachov@nvidia.com
Headers	show Return-Path: <gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org> DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 1454C4BA2E27 Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C From: <ktkachov@nvidia.com> To: <gcc-patches@gcc.gnu.org> CC: Kyrylo Tkachov <ktkachov@nvidia.com> Subject: [PATCH 00/13] Saturating arithmetic matching improvements Date: Wed, 2 Sep 2026 16:52:40 +0200 Message-ID: <20260902145254.77832-1-ktkachov@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Precedence: list Errors-To: gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org
Series	Saturating arithmetic matching improvements \| expand [00/13] Saturating arithmetic matching improvements [01/13] match-sat-alu.pd: Allow wider ranges for signed saturating truncation [02/13] match-sat-alu.pd: Recognize X - MIN (X, Y) as saturating subtraction [03/13] match-sat-alu.pd: Recognize signed saturation clamps [04/13] match-sat-alu.pd: Recognize borrow-test saturating subtraction [05/13] match-sat-alu.pd: Recognize more unsigned saturating subtraction forms [06/13] match-sat-alu.pd: Recognize complement tests for unsigned saturating addition [07/13] match-sat-alu.pd: Recognize X + MIN (~X, Y) as unsigned saturating addition [08/13] match-sat-alu.pd: Recognize strict widened unsigned saturation clamps [09/13] match-sat-alu.pd: Recognize signed saturating truncation after a shift [10/13] match-sat-alu.pd: Recognize unsigned constant-clamp truncation [11/13] match-sat-alu.pd: Recognize signed constant-clamp truncation [12/13] match-sat-alu.pd: Recognize complement masks for unsigned saturating truncation [13/13] match.pd: Narrow promoted saturating addition and subtraction

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20260902145254.77832-1-ktkachov@nvidia.com

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Subject: [PATCH 00/13] Saturating arithmetic matching improvements
Date: Wed, 2 Sep 2026 16:52:40 +0200
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Series

Saturating arithmetic matching improvements | expand

Message

Kyrylo Tkachov Sept. 2, 2026, 2:52 p.m. UTC

From: Kyrylo Tkachov <ktkachov@nvidia.com>

Hi all,

This series teaches GCC to recognise some more saturating arithmetic patterns,
primarily through match-sat-alu.pd and match.pd matchers.
These patterns were identified in a number of OSS workloads like video encoding
with the help of AI agents, though the patches themselves are manually written.

Bootstrapped and tested on aarch64-none-linux-gnu.
Ok for trunk?
Thanks,
Kyrill

Kyrylo Tkachov (13):
  match-sat-alu.pd: Allow wider ranges for signed saturating truncation
  match-sat-alu.pd: Recognize X - MIN (X, Y) as saturating subtraction
  match-sat-alu.pd: Recognize signed saturation clamps
  match-sat-alu.pd: Recognize borrow-test saturating subtraction
  match-sat-alu.pd: Recognize more unsigned saturating subtraction forms
  match-sat-alu.pd: Recognize complement tests for unsigned saturating
    addition
  match-sat-alu.pd: Recognize X + MIN (~X, Y) as unsigned saturating
    addition
  match-sat-alu.pd: Recognize strict widened unsigned saturation clamps
  match-sat-alu.pd: Recognize signed saturating truncation after a shift
  match-sat-alu.pd: Recognize unsigned constant-clamp truncation
  match-sat-alu.pd: Recognize signed constant-clamp truncation
  match-sat-alu.pd: Recognize complement masks for unsigned saturating
    truncation
  match.pd: Narrow promoted saturating addition and subtraction

 gcc/match-sat-alu.pd                          | 341 ++++++++++++++++--
 gcc/match.pd                                  |  37 ++
 gcc/testsuite/gcc.dg/sat-trunc-signed-cmp-2.c |  42 +++
 .../gcc.dg/vect/vect-sat-trunc-clamp-1.c      | 121 +++++++
 .../gcc.dg/vect/vect-sat-trunc-clamp-2.c      | 126 +++++++
 .../gcc.dg/vect/vect-sat-trunc-complement-1.c |  70 ++++
 .../vect/vect-sat-trunc-range-precision-1.c   | 122 +++++++
 .../vect/vect-sat-trunc-shift-sign-source-1.c | 221 ++++++++++++
 .../gcc.target/aarch64/sat_s_clamp-1.c        |  78 ++++
 .../gcc.target/aarch64/sat_s_clamp-2.c        |  43 +++
 .../gcc.target/aarch64/sat_s_val_ashr-1.c     |  30 ++
 .../gcc.target/aarch64/sat_u_add_min_not-1.c  |  18 +
 .../gcc.target/aarch64/sat_u_add_not_cmp-1.c  |  30 ++
 .../gcc.target/aarch64/sat_u_add_not_cmp-2.c  |  17 +
 .../gcc.target/aarch64/sat_u_add_widen_lt-1.c |  32 ++
 .../gcc.target/aarch64/sat_u_promoted-1.c     |  29 ++
 .../gcc.target/aarch64/sat_u_promoted-2.c     |  32 ++
 .../gcc.target/aarch64/sat_u_sub_borrow-1.c   |  22 ++
 .../gcc.target/aarch64/sat_u_sub_minmax-1.c   |  18 +
 .../gcc.target/aarch64/sat_u_sub_minmax-2.c   |  32 ++
 .../gcc.target/aarch64/sat_u_sub_minmax-3.c   |  27 ++
 .../gcc.target/aarch64/sat_u_sub_swapped-1.c  |  27 ++
 .../aarch64/saturating_arithmetic_1.c         |   2 +-
 .../aarch64/sve/saturating_arithmetic_1.c     |   2 +-
 .../aarch64/sve/saturating_arithmetic_3.c     |   2 +-
 .../aarch64/sve/saturating_arithmetic_4.c     |   2 +-
 .../vect-sat-trunc-clamp-inner-use-1.c        |  22 ++
 .../vect-sat-trunc-clamp-multi-use-1.c        |  21 ++
 .../aarch64/vect-sat-trunc-clamp-s-1.c        |   7 +
 .../vect-sat-trunc-clamp-s-negative-1.c       |  30 ++
 .../aarch64/vect-sat-trunc-clamp-u-1.c        |   7 +
 .../vect-sat-trunc-clamp-u-negative-1.c       |  30 ++
 .../aarch64/vect-sat-trunc-complement-1.c     |  30 ++
 .../vect-sat-trunc-range-precision-1.c        |   7 +
 ...ect-sat-trunc-range-precision-negative-1.c |  24 ++
 .../vect-sat-trunc-shift-sign-source-1.c      |   7 +
 ...t-sat-trunc-shift-sign-source-negative-1.c | 122 +++++++
 gcc/tree-ssa-math-opts.cc                     |  17 +-
 38 files changed, 1807 insertions(+), 40 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/sat-trunc-signed-cmp-2.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-clamp-1.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-clamp-2.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-complement-1.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-range-precision-1.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-shift-sign-source-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_s_clamp-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_s_clamp-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_s_val_ashr-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_min_not-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_not_cmp-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_not_cmp-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_widen_lt-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_promoted-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_promoted-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_borrow-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_minmax-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_minmax-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_minmax-3.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_swapped-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-inner-use-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-multi-use-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-s-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-s-negative-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-u-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-u-negative-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-complement-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-range-precision-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-range-precision-negative-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-shift-sign-source-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-shift-sign-source-negative-1.c

Comments

Kyrylo Tkachov Sept. 2, 2026, 2:52 p.m. UTC | #1

From: Kyrylo Tkachov <ktkachov@nvidia.com>

Hi all,

This series teaches GCC to recognise some more saturating arithmetic patterns,
primarily through match-sat-alu.pd and match.pd matchers.
These patterns were identified in a number of OSS workloads like video encoding
with the help of AI agents, though the patches themselves are manually written.

Bootstrapped and tested on aarch64-none-linux-gnu.
Ok for trunk?
Thanks,
Kyrill

Kyrylo Tkachov (13):
  match-sat-alu.pd: Allow wider ranges for signed saturating truncation
  match-sat-alu.pd: Recognize X - MIN (X, Y) as saturating subtraction
  match-sat-alu.pd: Recognize signed saturation clamps
  match-sat-alu.pd: Recognize borrow-test saturating subtraction
  match-sat-alu.pd: Recognize more unsigned saturating subtraction forms
  match-sat-alu.pd: Recognize complement tests for unsigned saturating
    addition
  match-sat-alu.pd: Recognize X + MIN (~X, Y) as unsigned saturating
    addition
  match-sat-alu.pd: Recognize strict widened unsigned saturation clamps
  match-sat-alu.pd: Recognize signed saturating truncation after a shift
  match-sat-alu.pd: Recognize unsigned constant-clamp truncation
  match-sat-alu.pd: Recognize signed constant-clamp truncation
  match-sat-alu.pd: Recognize complement masks for unsigned saturating
    truncation
  match.pd: Narrow promoted saturating addition and subtraction

 gcc/match-sat-alu.pd                          | 341 ++++++++++++++++--
 gcc/match.pd                                  |  37 ++
 gcc/testsuite/gcc.dg/sat-trunc-signed-cmp-2.c |  42 +++
 .../gcc.dg/vect/vect-sat-trunc-clamp-1.c      | 121 +++++++
 .../gcc.dg/vect/vect-sat-trunc-clamp-2.c      | 126 +++++++
 .../gcc.dg/vect/vect-sat-trunc-complement-1.c |  70 ++++
 .../vect/vect-sat-trunc-range-precision-1.c   | 122 +++++++
 .../vect/vect-sat-trunc-shift-sign-source-1.c | 221 ++++++++++++
 .../gcc.target/aarch64/sat_s_clamp-1.c        |  78 ++++
 .../gcc.target/aarch64/sat_s_clamp-2.c        |  43 +++
 .../gcc.target/aarch64/sat_s_val_ashr-1.c     |  30 ++
 .../gcc.target/aarch64/sat_u_add_min_not-1.c  |  18 +
 .../gcc.target/aarch64/sat_u_add_not_cmp-1.c  |  30 ++
 .../gcc.target/aarch64/sat_u_add_not_cmp-2.c  |  17 +
 .../gcc.target/aarch64/sat_u_add_widen_lt-1.c |  32 ++
 .../gcc.target/aarch64/sat_u_promoted-1.c     |  29 ++
 .../gcc.target/aarch64/sat_u_promoted-2.c     |  32 ++
 .../gcc.target/aarch64/sat_u_sub_borrow-1.c   |  22 ++
 .../gcc.target/aarch64/sat_u_sub_minmax-1.c   |  18 +
 .../gcc.target/aarch64/sat_u_sub_minmax-2.c   |  32 ++
 .../gcc.target/aarch64/sat_u_sub_minmax-3.c   |  27 ++
 .../gcc.target/aarch64/sat_u_sub_swapped-1.c  |  27 ++
 .../aarch64/saturating_arithmetic_1.c         |   2 +-
 .../aarch64/sve/saturating_arithmetic_1.c     |   2 +-
 .../aarch64/sve/saturating_arithmetic_3.c     |   2 +-
 .../aarch64/sve/saturating_arithmetic_4.c     |   2 +-
 .../vect-sat-trunc-clamp-inner-use-1.c        |  22 ++
 .../vect-sat-trunc-clamp-multi-use-1.c        |  21 ++
 .../aarch64/vect-sat-trunc-clamp-s-1.c        |   7 +
 .../vect-sat-trunc-clamp-s-negative-1.c       |  30 ++
 .../aarch64/vect-sat-trunc-clamp-u-1.c        |   7 +
 .../vect-sat-trunc-clamp-u-negative-1.c       |  30 ++
 .../aarch64/vect-sat-trunc-complement-1.c     |  30 ++
 .../vect-sat-trunc-range-precision-1.c        |   7 +
 ...ect-sat-trunc-range-precision-negative-1.c |  24 ++
 .../vect-sat-trunc-shift-sign-source-1.c      |   7 +
 ...t-sat-trunc-shift-sign-source-negative-1.c | 122 +++++++
 gcc/tree-ssa-math-opts.cc                     |  17 +-
 38 files changed, 1807 insertions(+), 40 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/sat-trunc-signed-cmp-2.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-clamp-1.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-clamp-2.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-complement-1.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-range-precision-1.c
 create mode 100644 gcc/testsuite/gcc.dg/vect/vect-sat-trunc-shift-sign-source-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_s_clamp-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_s_clamp-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_s_val_ashr-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_min_not-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_not_cmp-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_not_cmp-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_add_widen_lt-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_promoted-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_promoted-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_borrow-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_minmax-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_minmax-2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_minmax-3.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/sat_u_sub_swapped-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-inner-use-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-multi-use-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-s-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-s-negative-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-u-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-clamp-u-negative-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-complement-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-range-precision-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-range-precision-negative-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-shift-sign-source-1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/vect-sat-trunc-shift-sign-source-negative-1.c