From: ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 16 Dec 2015 10:01:48 +0000 (+0000)
Subject: [ARM] PR target/68648: Fold NOT of CONST_INT in andsi_iorsi3_notsi splitter
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=054fd237e4058578d592319d2f0b9063032fed81;p=thirdparty%2Fgcc.git

[ARM] PR target/68648: Fold NOT of CONST_INT in andsi_iorsi3_notsi splitter

	PR target/68648
	* config/arm/arm.md (*andsi_iorsi3_notsi): Try to simplify
	the complement of operands[3] during splitting.

	* gcc.c-torture/execute/pr68648.c: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@231675 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6450d52b0c2c..464558f51e47 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-12-16  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/68648
+	* config/arm/arm.md (*andsi_iorsi3_notsi): Try to simplify
+	the complement of operands[3] during splitting.
+
 2015-12-16  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/68892
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index a91873c8948b..26833613edf4 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -3228,8 +3228,22 @@
   "#"   ; "orr%?\\t%0, %1, %2\;bic%?\\t%0, %0, %3"
   "&& reload_completed"
   [(set (match_dup 0) (ior:SI (match_dup 1) (match_dup 2)))
-   (set (match_dup 0) (and:SI (not:SI (match_dup 3)) (match_dup 0)))]
-  ""
+   (set (match_dup 0) (and:SI (match_dup 4) (match_dup 5)))]
+  {
+     /* If operands[3] is a constant make sure to fold the NOT into it
+	to avoid creating a NOT of a CONST_INT.  */
+    rtx not_rtx = simplify_gen_unary (NOT, SImode, operands[3], SImode);
+    if (CONST_INT_P (not_rtx))
+      {
+	operands[4] = operands[0];
+	operands[5] = not_rtx;
+      }
+    else
+      {
+	operands[5] = operands[0];
+	operands[4] = not_rtx;
+      }
+  }
   [(set_attr "length" "8")
    (set_attr "ce_count" "2")
    (set_attr "predicable" "yes")
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 7a3c5e469957..d90d43c920fd 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-12-16  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/68648
+	* gcc.c-torture/execute/pr68648.c: New test.
+
 2015-12-16  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/68892
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr68648.c b/gcc/testsuite/gcc.c-torture/execute/pr68648.c
new file mode 100644
index 000000000000..fc66806a99a0
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr68648.c
@@ -0,0 +1,20 @@
+int __attribute__ ((noinline))
+foo (void)
+{
+  return 123;
+}
+
+int __attribute__ ((noinline))
+bar (void)
+{
+  int c = 1;
+  c |= 4294967295 ^ (foo () | 4073709551608);
+  return c;
+}
+
+int
+main ()
+{
+  if (bar () != 0x83fd4005)
+    __builtin_abort ();
+}