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From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: linux-sparse@vger.kernel.org
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: [PATCH 2/5] asm-mem: add testcase for missing reload after asm memops
Date: Sun, 21 Feb 2021 23:34:49 +0100	[thread overview]
Message-ID: <20210221223452.8075-3-luc.vanoostenryck@gmail.com> (raw)
In-Reply-To: <20210221223452.8075-1-luc.vanoostenryck@gmail.com>

Memory simplification is done with the help of the function
dominates() which determine when memory instructions interfere.

This function handles OP_CALLs, OP_LOADs and OP_STOREs but
memory can also be changed via OP_ASMs.

Add a testcase showing this.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 validation/mem2reg/asm-reload0.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 validation/mem2reg/asm-reload0.c

diff --git a/validation/mem2reg/asm-reload0.c b/validation/mem2reg/asm-reload0.c
new file mode 100644
index 000000000000..c9e297dde428
--- /dev/null
+++ b/validation/mem2reg/asm-reload0.c
@@ -0,0 +1,15 @@
+static int asm_reload(void)
+{
+	int mem = 0;
+	asm volatile ("[%1] <= 1" : "=m" (mem));
+	return mem;
+}
+
+/*
+ * check-name: asm-reload0
+ * check-command: test-linearize $file
+ * check-known-to-fail
+ *
+ * check-output-ignore
+ * check-output-contains: load\\.
+ */
-- 
2.30.0


  parent reply	other threads:[~2021-02-21 22:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-21 22:34 [PATCH 0/5] teach memory simplification about ASM instructions Luc Van Oostenryck
2021-02-21 22:34 ` [PATCH 1/5] reorg dominates() Luc Van Oostenryck
2021-02-21 22:34 ` Luc Van Oostenryck [this message]
2021-02-21 22:34 ` [PATCH 3/5] asm-mem: does it clobber memory? Luc Van Oostenryck
2021-02-21 22:34 ` [PATCH 4/5] asm-mem: does it output to memory? Luc Van Oostenryck
2021-02-21 22:34 ` [PATCH 5/5] asm-mem: teach dominates() about OP_ASM Luc Van Oostenryck

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