From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: linux-sparse@vger.kernel.org
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: [PATCH 7/9] simplify (x | M) {==,!=} C
Date: Wed, 10 Mar 2021 22:49:48 +0100 [thread overview]
Message-ID: <20210310214950.84192-8-luc.vanoostenryck@gmail.com> (raw)
In-Reply-To: <20210310214950.84192-1-luc.vanoostenryck@gmail.com>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
simplify.c | 15 +++++++++++++++
validation/optim/cmpe-or0.c | 1 -
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index b46e08c3b79a..865fadfb590e 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1311,6 +1311,21 @@ static int simplify_compare_constant(struct instruction *insn, long long value)
break;
}
break;
+ case OP_OR:
+ if (!constant(def->src2))
+ break;
+ bits = def->src2->value;
+ switch (insn->opcode) {
+ case OP_SET_EQ:
+ if ((value & bits) != bits)
+ return replace_with_value(insn, 0);
+ break;
+ case OP_SET_NE:
+ if ((value & bits) != bits)
+ return replace_with_value(insn, 1);
+ break;
+ }
+ break;
case OP_SEXT: // sext(x) cmp C --> x cmp trunc(C)
osize = def->orig_type->bit_size;
if (is_signed_constant(value, osize, size)) {
diff --git a/validation/optim/cmpe-or0.c b/validation/optim/cmpe-or0.c
index bef2316120f7..2e89d611117d 100644
--- a/validation/optim/cmpe-or0.c
+++ b/validation/optim/cmpe-or0.c
@@ -4,7 +4,6 @@ int cmp_ne(int a) { return ((a | 1) == 0) + 1; }
/*
* check-name: cmpe-or0
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-returns: 1
--
2.30.0
next prev parent reply other threads:[~2021-03-10 22:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 21:49 [PATCH 0/9] simplify CMP(AND(x,M), C) and CMP(OR(x,M), C) Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 1/9] change testing of signed compares against SMIN or SMAX Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 2/9] add testcases for constant compares against AND/OR Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 3/9] simplify (x & M) cmps C Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 4/9] simplify (x & M) cmpu C Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 5/9] simplify (x & M) cmps 0 Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 6/9] simplify (x & M) {==,!=} C Luc Van Oostenryck
2021-03-10 21:49 ` Luc Van Oostenryck [this message]
2021-03-10 21:49 ` [PATCH 8/9] simplify (x | M) cmps C Luc Van Oostenryck
2021-03-10 21:49 ` [PATCH 9/9] simplify (x | M) cmpu C Luc Van Oostenryck
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