[patch,nvptx] Add atomic_fetch* support for SImode arguments.

[Cesar Philippidis]

I've committed this patch extends the nvptx atomic_fetch_<logic><mode>
pattern to accept SImode arguments regardless of the -misa argument
supplied. Tom had pre-approved this patch awhile ago. As the test case
demonstrates, it only works 32-bit pointers.

While adding the new test case, I noticed that I named atomic-fetch-2.c
incorrectly; there should be an underscore between atomic and fetch.
This patch also fixes that.

I tested this patch using both a standalone nvptx compiler and x86_64
Linux with nvptx offloading.

Cesar

[nvptx] Add atomic_fetch* support for SImode arguments.

2018-09-17  Cesar Philippidis  <ce...@codesourcery.com>
	    Bernd Schmidt <bernds_...@t-online.de>

	gcc/
	* config/nvptx/nvptx.md (atomic_fetch_<logic><mode>): Enable with
	SImode args.

	gcc/testsuite/
	* gcc.target/nvptx/atomic-fetch-2.c: Rename to ...
	* gcc.target/nvptx/atomic_fetch-2.c: ... this.
	* gcc.target/nvptx/atomic_fetch-3.c: New test.

---
 gcc/config/nvptx/nvptx.md                     |  2 +-
 .../{atomic-fetch-2.c => atomic_fetch-2.c}    |  0
 .../gcc.target/nvptx/atomic_fetch-3.c         | 24 +++++++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)
 rename gcc/testsuite/gcc.target/nvptx/{atomic-fetch-2.c => atomic_fetch-2.c} (100%)
 create mode 100644 gcc/testsuite/gcc.target/nvptx/atomic_fetch-3.c

diff --git a/gcc/config/nvptx/nvptx.md b/gcc/config/nvptx/nvptx.md
index dd6032d021b..ca00b1d8073 100644
--- a/gcc/config/nvptx/nvptx.md
+++ b/gcc/config/nvptx/nvptx.md
@@ -1449,7 +1449,7 @@
 	  UNSPECV_LOCK))
    (set (match_operand:SDIM 0 "nvptx_register_operand" "=R")
 	(match_dup 1))]
-  "TARGET_SM35"
+  "<MODE>mode == SImode || TARGET_SM35"
   "%.\\tatom%A1.b%T0.<logic>\\t%0, %1, %2;"
   [(set_attr "atomic" "true")])
 
diff --git a/gcc/testsuite/gcc.target/nvptx/atomic-fetch-2.c b/gcc/testsuite/gcc.target/nvptx/atomic_fetch-2.c
similarity index 100%
rename from gcc/testsuite/gcc.target/nvptx/atomic-fetch-2.c
rename to gcc/testsuite/gcc.target/nvptx/atomic_fetch-2.c
diff --git a/gcc/testsuite/gcc.target/nvptx/atomic_fetch-3.c b/gcc/testsuite/gcc.target/nvptx/atomic_fetch-3.c
new file mode 100644
index 00000000000..36a83ebba9b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/nvptx/atomic_fetch-3.c
@@ -0,0 +1,24 @@
+/* Test the nvptx atomic instructions for __atomic_fetch_OP for
+   SImode arguments.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2 -m32" } */
+
+int
+main()
+{
+  unsigned long a = ~0;
+  unsigned b = 0xa;
+
+  __atomic_fetch_add (&a, b, 0);
+  __atomic_fetch_and (&a, b, 0);
+  __atomic_fetch_or (&a, b, 0);
+  __atomic_fetch_xor (&a, b, 0);
+  
+  return a;
+}
+
+/* { dg-final { scan-assembler "atom.add.u32" } } */
+/* { dg-final { scan-assembler "atom.b32.and" } } */
+/* { dg-final { scan-assembler "atom.b32.or" } } */
+/* { dg-final { scan-assembler "atom.b32.xor" } } */
-- 
2.17.1