From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: linux-sparse@vger.kernel.org
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: [PATCH 17/22] sub: simplify (x + y) - x --> y
Date: Tue, 20 Oct 2020 23:10:16 +0200 [thread overview]
Message-ID: <20201020211021.82394-18-luc.vanoostenryck@gmail.com> (raw)
In-Reply-To: <20201020211021.82394-1-luc.vanoostenryck@gmail.com>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
simplify.c | 8 ++++++++
validation/optim/simplify-same-add-subl.c | 1 -
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index 187d4fc0c9ab..cb401d8fac9f 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1382,9 +1382,17 @@ static int simplify_add(struct instruction *insn)
static int simplify_sub(struct instruction *insn)
{
+ pseudo_t src1 = insn->src1;
pseudo_t src2 = insn->src2;
struct instruction *def;
+ switch (DEF_OPCODE(def, src1)) {
+ case OP_ADD:
+ if (def->src1 == src2) // (x + y) - x --> y
+ return replace_with_pseudo(insn, def->src2);
+ break;
+ }
+
switch (DEF_OPCODE(def, src2)) {
case OP_NEG: // (x - -y) --> (x + y)
insn->opcode = OP_ADD;
diff --git a/validation/optim/simplify-same-add-subl.c b/validation/optim/simplify-same-add-subl.c
index 1f17ef0b968e..394e7dc5a404 100644
--- a/validation/optim/simplify-same-add-subl.c
+++ b/validation/optim/simplify-same-add-subl.c
@@ -3,7 +3,6 @@ int add_subl(int x, int y) { return (x + y) - x; }
/*
* check-name: simplify-same-add-subl
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-start
add_subl:
--
2.28.0
next prev parent reply other threads:[~2020-10-20 21:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-20 21:09 [PATCH 00/22] essential OP_ADD & OP_SUB simplifications Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 01/22] add testcases about " Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 02/22] let switch_pseudo() return REPEAT_CSE Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 03/22] extract eval_op() from eval_insn() Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 04/22] unop: add helper eval_unop() Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 05/22] unop: add helper replace_with_unop() Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 06/22] add a flag to identify commutative & associative ops Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 07/22] constants must be truncated to the operation's size Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 08/22] reassoc: simplify (x # C) # K --> x # eval(C # K) Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 09/22] sub: reorganize handling of OP_{ADD,SUB}s with constant rightside Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 10/22] sub: canonicalize (0 - x) into -x Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 11/22] sub: simplify C - (y + D) --> eval(C-D) - y Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 12/22] sub: simplify C - (D - z) --> z + eval(C-D) Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 13/22] sub: simplify (C - y) + D --> eval(C+D) - y Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 14/22] sub: simplify (x - -y) --> (x + y) Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 15/22] add: simplify (x + -y) --> (x - y) Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 16/22] add: simplify (-x + y) --> (y - x) Luc Van Oostenryck
2020-10-20 21:10 ` Luc Van Oostenryck [this message]
2020-10-20 21:10 ` [PATCH 18/22] sub: simplify (x + y) - y --> x Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 19/22] sub: simplify x - (x + y) --> -y Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 20/22] sub: simplify x - (y + x) " Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 21/22] sub: simplify (x - y) + y --> x Luc Van Oostenryck
2020-10-20 21:10 ` [PATCH 22/22] sub: simplify x + (y - x) --> y Luc Van Oostenryck
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