From: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date: Thu, 23 Mar 2017 14:55:48 +0000 (+0000)
Subject: [ARM] PR target/71436: Restrict *load_multiple pattern till after LRA
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=de2b3f5ca93a5627988f274e5e325d023e01f2a1;p=gcc.git

[ARM] PR target/71436: Restrict *load_multiple pattern till after LRA

	PR target/71436
	* config/arm/arm.md (*load_multiple): Add reload_completed to
	matching condition.

	* gcc.c-torture/compile/pr71436.c: New test.

From-SVN: r246419
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 091d78ab739..98254eb4c80 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-03-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/71436
+	* config/arm/arm.md (*load_multiple): Add reload_completed to
+	matching condition.
+
 2017-03-23  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
             Richard Biener  <rguenth@suse.com>
 
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index 8720a7178d3..71cc109e102 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -11832,12 +11832,15 @@
 
 ;; Patterns in ldmstm.md don't cover more than 4 registers. This pattern covers
 ;; large lists without explicit writeback generated for APCS_FRAME epilogue.
+;; The operands are validated through the load_multiple_operation
+;; match_parallel predicate rather than through constraints so enable it only
+;; after reload.
 (define_insn "*load_multiple"
   [(match_parallel 0 "load_multiple_operation"
     [(set (match_operand:SI 2 "s_register_operand" "=rk")
           (mem:SI (match_operand:SI 1 "s_register_operand" "rk")))
         ])]
-  "TARGET_32BIT"
+  "TARGET_32BIT && reload_completed"
   "*
   {
     arm_output_multireg_pop (operands, /*return_pc=*/false,
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 257c5ce832a..14b75162038 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-03-23  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/71436
+	* gcc.c-torture/compile/pr71436.c: New test.
+
 2017-03-23  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
             Richard Biener  <rguenther@suse.de>
 
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr71436.c b/gcc/testsuite/gcc.c-torture/compile/pr71436.c
new file mode 100644
index 00000000000..ab08d5d369c
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr71436.c
@@ -0,0 +1,35 @@
+/* PR target/71436.  */
+
+#pragma pack(1)
+struct S0
+{
+  volatile int f0;
+  short f2;
+};
+
+void foo (struct S0 *);
+int a, d;
+static struct S0 b[5];
+static struct S0 c;
+void fn1 ();
+void
+main ()
+{
+  {
+    struct S0 e;
+    for (; d; fn1 ())
+      {
+        {
+          a = 3;
+          for (; a >= 0; a -= 1)
+            {
+              {
+                e = c;
+              }
+              b[a] = e;
+            }
+        }
+      }
+  }
+  foo (b);
+}