From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: linux-sparse@vger.kernel.org
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: [PATCH 0/7] simplify logical negation
Date: Sun, 22 Nov 2020 16:27:24 +0100 [thread overview]
Message-ID: <20201122152731.10994-1-luc.vanoostenryck@gmail.com> (raw)
This series contains simplifications for tautologies and
contradictions involving logical negation, like (~x & x)
or ((x > y) | (x <= y)).
As a bonus (but needed for these simplifications), now
PSEUDO_REGs and PSEUDO_ARGs are also taken in account when
checking if operands are in canonical order, which creates
a few CSE opportunities of its own.
Luc Van Oostenryck (7):
not: add testcases for canonicalization & simplification of negations
canon: put PSEUDO_ARGs in canonical order too
canon: put PSEUDO_REGs in canonical order too
canon: simplify calculation of canonical order
opcode: add helpers opcode_negate() & opcode_swap()
not: simplify (~x {&,|,^} x) --> {0,~0,~0}
not: simplify ((x cmp y) {&,|,^} (x !cmp y)) --> {0,1,1}
linearize.h | 4 +-
opcode.h | 10 +++
simplify.c | 118 +++++++++++++++++++++++++---
validation/linear/pointer-arith32.c | 12 +--
validation/linear/pointer-arith64.c | 10 +--
validation/optim/canonical-arg.c | 20 +++++
validation/optim/canonical-not.c | 9 +++
validation/optim/cse-arg01.c | 9 +++
validation/optim/cse-not01.c | 11 +++
validation/optim/cse-not02.c | 11 +++
validation/optim/cse-reg01.c | 9 +++
11 files changed, 200 insertions(+), 23 deletions(-)
create mode 100644 validation/optim/canonical-arg.c
create mode 100644 validation/optim/canonical-not.c
create mode 100644 validation/optim/cse-arg01.c
create mode 100644 validation/optim/cse-not01.c
create mode 100644 validation/optim/cse-not02.c
create mode 100644 validation/optim/cse-reg01.c
--
2.29.2
next reply other threads:[~2020-11-22 15:27 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-22 15:27 Luc Van Oostenryck [this message]
2020-11-22 15:27 ` [PATCH 1/7] not: add testcases for canonicalization & simplification of negations Luc Van Oostenryck
2020-11-22 19:00 ` Linus Torvalds
2020-11-22 19:57 ` Luc Van Oostenryck
2020-11-22 20:13 ` Linus Torvalds
2020-11-22 20:38 ` Luc Van Oostenryck
2020-11-22 22:26 ` Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 0/6] 'bits translation' simplification Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 1/6] add testscases for 'bits translation' optimization Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 2/6] factorize SEL(x, OP(y,z), y) into OP(SEL(x, z, 0), y) Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 3/6] add helper is_power_of_2() Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 4/6] add helper is_pow2() Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 5/6] add log base 2 function: log2_exact() Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 6/6] convert SEL(x & BIT1, BIT2, 0) into SHIFT(x & BIT1, S) Luc Van Oostenryck
2020-11-27 22:25 ` [PATCH 7/7] move up instructions blocking if-conversion Luc Van Oostenryck
2020-11-27 22:44 ` [PATCH 0/6] 'bits translation' simplification Linus Torvalds
2020-11-22 15:27 ` [PATCH 2/7] canon: put PSEUDO_ARGs in canonical order too Luc Van Oostenryck
2020-11-22 15:27 ` [PATCH 3/7] canon: put PSEUDO_REGs " Luc Van Oostenryck
2020-11-22 15:27 ` [PATCH 4/7] canon: simplify calculation of canonical order Luc Van Oostenryck
2020-11-22 15:27 ` [PATCH 5/7] opcode: add helpers opcode_negate() & opcode_swap() Luc Van Oostenryck
2020-11-22 15:27 ` [PATCH 6/7] not: simplify (~x {&,|,^} x) --> {0,~0,~0} Luc Van Oostenryck
2020-11-22 15:27 ` [PATCH 7/7] not: simplify ((x cmp y) {&,|,^} (x !cmp y)) --> {0,1,1} Luc Van Oostenryck
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