From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 7 May 2009 15:53:11 +0000 (+0200)
Subject: re PR middle-end/40057 (Incorrect right shift by 31 with long long)
X-Git-Tag: releases/gcc-4.3.4~189
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e546529d6f9081f7961ba4a622b22f628860135;p=thirdparty%2Fgcc.git

re PR middle-end/40057 (Incorrect right shift by 31 with long long)

	PR middle-end/40057
	* dojump.c (prefer_and_bit_test): Use immed_double_const instead of
	GEN_INT for 1 << bitnum.
	(do_jump) <case BIT_AND_EXPR>: Use build_int_cst_wide_type instead of
	build_int_cst_type.

	* gcc.c-torture/execute/pr40057.c: New test.

From-SVN: r147245
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8d3ef5bf992b..d84af7aa2e13 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2009-05-07  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/40057
+	* dojump.c (prefer_and_bit_test): Use immed_double_const instead of
+	GEN_INT for 1 << bitnum.
+	(do_jump) <case BIT_AND_EXPR>: Use build_int_cst_wide_type instead of
+	build_int_cst_type.
+
 2009-04-29  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* toplev.c (print_version): Update GMP version string calculation.
diff --git a/gcc/dojump.c b/gcc/dojump.c
index da11f3ae32b5..2027b70eb4a2 100644
--- a/gcc/dojump.c
+++ b/gcc/dojump.c
@@ -141,7 +141,8 @@ prefer_and_bit_test (enum machine_mode mode, int bitnum)
     }
 
   /* Fill in the integers.  */
-  XEXP (and_test, 1) = GEN_INT ((unsigned HOST_WIDE_INT) 1 << bitnum);
+  XEXP (and_test, 1)
+    = immed_double_const ((unsigned HOST_WIDE_INT) 1 << bitnum, 0, mode);
   XEXP (XEXP (shift_test, 0), 1) = GEN_INT (bitnum);
 
   return (rtx_cost (and_test, IF_THEN_ELSE)
@@ -251,10 +252,10 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
 		  && prefer_and_bit_test (TYPE_MODE (argtype),
 					  TREE_INT_CST_LOW (shift)))
 		{
-		  HOST_WIDE_INT mask = (HOST_WIDE_INT) 1
-				       << TREE_INT_CST_LOW (shift);
+		  unsigned HOST_WIDE_INT mask
+		    = (unsigned HOST_WIDE_INT) 1 << TREE_INT_CST_LOW (shift);
 		  do_jump (build2 (BIT_AND_EXPR, argtype, arg,
-				   build_int_cst_type (argtype, mask)),
+				   build_int_cst_wide_type (argtype, mask, 0)),
 			   clr_label, set_label);
 		  break;
 		}
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b18a3143b2a0..4656576ae956 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2009-05-07  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/40057
+	* gcc.c-torture/execute/pr40057.c: New test.
+
 2009-05-06  Janis Johnson  <janis187@us.ibm.com>
 
 	* gcc.dg/dfp/pr39986.c: New test.
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr40057.c b/gcc/testsuite/gcc.c-torture/execute/pr40057.c
new file mode 100644
index 000000000000..9d5c4e31e87e
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr40057.c
@@ -0,0 +1,37 @@
+/* PR middle-end/40057 */
+
+extern void abort (void);
+
+__attribute__((noinline)) int
+foo (unsigned long long x)
+{
+  unsigned long long y = (x >> 31ULL) & 1ULL;
+  if (y == 0ULL)
+    return 0;
+  return -1;
+}
+
+__attribute__((noinline)) int
+bar (long long x)
+{
+  long long y = (x >> 31LL) & 1LL;
+  if (y == 0LL)
+    return 0;
+  return -1;
+}
+
+int
+main (void)
+{
+  if (sizeof (long long) != 8)
+    return 0;
+  if (foo (0x1682a9aaaULL))
+    abort ();
+  if (!foo (0x1882a9aaaULL))
+    abort ();
+  if (bar (0x1682a9aaaLL))
+    abort ();
+  if (!bar (0x1882a9aaaLL))
+    abort ();
+  return 0;
+}