From e27bfda2fc621864fd0ffd2ba3a2cee38b3c7965 Mon Sep 17 00:00:00 2001
From: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date: Mon, 7 Nov 2016 11:43:57 +0000
Subject: [PATCH] [AArch64] Fix PR target/77822: Use tighter predicates for
 zero_extract patterns

	PR target/77822
	* config/aarch64/aarch64.md (*tb<optab><mode>1): Use
	aarch64_simd_shift_imm_<mode> predicate for operand 1.
	(<optab>, ANY_EXTRACT): Use tighter predicates on operands 2 and 3
	to restrict them to an appropriate range and add FAIL check if the
	region they specify is out of range.  Delete useless constraint
	strings.
	(*<optab><mode>, ANY_EXTRACT): Add appropriate predicates on operands
	2 and 3 to restrict their range and add pattern predicate.

	* g++.dg/torture/pr77822.C: New test.

From-SVN: r241898
---
 gcc/ChangeLog                          | 12 +++++++++++
 gcc/config/aarch64/aarch64.md          | 26 +++++++++++++++-------
 gcc/testsuite/ChangeLog                |  5 +++++
 gcc/testsuite/g++.dg/torture/pr77822.C | 30 ++++++++++++++++++++++++++
 4 files changed, 65 insertions(+), 8 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/torture/pr77822.C

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3af754fbf10..1bc2934e5c0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,15 @@
+2016-11-07  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/77822
+	* config/aarch64/aarch64.md (*tb<optab><mode>1): Use
+	aarch64_simd_shift_imm_<mode> predicate for operand 1.
+	(<optab>, ANY_EXTRACT): Use tighter predicates on operands 2 and 3
+	to restrict them to an appropriate range and add FAIL check if the
+	region they specify is out of range.  Delete useless constraint
+	strings.
+	(*<optab><mode>, ANY_EXTRACT): Add appropriate predicates on operands
+	2 and 3 to restrict their range and add pattern predicate.
+
 2016-11-07  Martin Liska  <mliska@suse.cz>
 
 	* asan.c (enum asan_check_flags): Move the enum to header file.
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index d5df9bb91b4..46eaa30b159 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -639,7 +639,8 @@
   [(set (pc) (if_then_else
 	      (EQL (zero_extract:DI (match_operand:GPI 0 "register_operand" "r")
 				    (const_int 1)
-				    (match_operand 1 "const_int_operand" "n"))
+				    (match_operand 1
+				      "aarch64_simd_shift_imm_<mode>" "n"))
 		   (const_int 0))
 	     (label_ref (match_operand 2 "" ""))
 	     (pc)))
@@ -4268,19 +4269,28 @@
 
 (define_expand "<optab>"
   [(set (match_operand:DI 0 "register_operand" "=r")
-	(ANY_EXTRACT:DI (match_operand:DI 1 "register_operand" "r")
-			(match_operand 2 "const_int_operand" "n")
-			(match_operand 3 "const_int_operand" "n")))]
-  ""
+	(ANY_EXTRACT:DI (match_operand:DI 1 "register_operand")
+			(match_operand 2
+			  "aarch64_simd_shift_imm_offset_di")
+			(match_operand 3 "aarch64_simd_shift_imm_di")))]
   ""
+  {
+    if (!IN_RANGE (INTVAL (operands[2]) + INTVAL (operands[3]),
+		   1, GET_MODE_BITSIZE (DImode) - 1))
+     FAIL;
+  }
 )
 
+
 (define_insn "*<optab><mode>"
   [(set (match_operand:GPI 0 "register_operand" "=r")
 	(ANY_EXTRACT:GPI (match_operand:GPI 1 "register_operand" "r")
-			 (match_operand 2 "const_int_operand" "n")
-			 (match_operand 3 "const_int_operand" "n")))]
-  ""
+			 (match_operand 2
+			   "aarch64_simd_shift_imm_offset_<mode>" "n")
+			 (match_operand 3
+			   "aarch64_simd_shift_imm_<mode>" "n")))]
+  "IN_RANGE (INTVAL (operands[2]) + INTVAL (operands[3]),
+	     1, GET_MODE_BITSIZE (<MODE>mode) - 1)"
   "<su>bfx\\t%<w>0, %<w>1, %3, %2"
   [(set_attr "type" "bfm")]
 )
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index cbc051f0acb..7094c885ab4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-11-07  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/77822
+	* g++.dg/torture/pr77822.C: New test.
+
 2016-11-07  Martin Liska  <mliska@suse.cz>
 
 	* c-c++-common/asan/force-inline-opt0-1.c: Disable
diff --git a/gcc/testsuite/g++.dg/torture/pr77822.C b/gcc/testsuite/g++.dg/torture/pr77822.C
new file mode 100644
index 00000000000..4dc428b63ee
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr77822.C
@@ -0,0 +1,30 @@
+// PR target/77822
+// { dg-do compile }
+
+using UINT8 = char;
+using UINT32 = int;
+using UINT64 = long;
+class A
+{
+  void m_fn1 ();
+  struct B
+  {
+    UINT32 m_multiplier;
+  };
+  UINT8 m_datawidth;
+  UINT8 m_subunits;
+  B m_subunit_infos[];
+};
+int a;
+UINT64 b;
+void
+A::m_fn1 ()
+{
+  int c = 32, d = m_datawidth / c;
+  for (int e = 0; e < d; e++)
+    {
+      UINT32 f = e * 32;
+      if (b >> f & 1)
+	m_subunit_infos[m_subunits].m_multiplier = a;
+    }
+}
-- 
2.30.2