From: Jakub Jelinek <jakub@redhat.com>
Date: Wed, 13 May 2015 08:07:58 +0000 (+0200)
Subject: re PR target/66112 (__builtin_mul_overflow for int16_t emits poor code)
X-Git-Tag: upstream/12.2.0~55043
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c1ee2e626ea59d8ba14a1d2f36621a2fe525320a;p=platform%2Fupstream%2Fgcc.git

re PR target/66112 (__builtin_mul_overflow for int16_t emits poor code)

	PR target/66112
	* internal-fn.c (get_min_precision): Use UNSIGNED instead of
	SIGNED to get precision of non-negative value.

	* gcc.target/i386/pr66112-1.c: New test.

From-SVN: r223115
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 35f8197..1199ad7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-05-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/66112
+	* internal-fn.c (get_min_precision): Use UNSIGNED instead of
+	SIGNED to get precision of non-negative value.
+
 2015-05-13  Ilya Enkovich  <ilya.enkovich@intel.com>
 
 	PR target/66048
diff --git a/gcc/internal-fn.c b/gcc/internal-fn.c
index 0053ed9..4eeb681 100644
--- a/gcc/internal-fn.c
+++ b/gcc/internal-fn.c
@@ -399,7 +399,7 @@ get_min_precision (tree arg, signop sign)
     }
   else if (sign == UNSIGNED && !wi::neg_p (arg_min, SIGNED))
     {
-      int p = wi::min_precision (arg_max, SIGNED);
+      int p = wi::min_precision (arg_max, UNSIGNED);
       prec = MIN (prec, p);
     }
   return prec + (orig_sign != sign);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 2f83f4e..4600fe1 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/66112
+	* gcc.target/i386/pr66112-1.c: New test.
+
 2015-05-13  Ilya Enkovich  <ilya.enkovich@intel.com>
 
 	PR target/66048
diff --git a/gcc/testsuite/gcc.target/i386/pr66112-1.c b/gcc/testsuite/gcc.target/i386/pr66112-1.c
new file mode 100644
index 0000000..268990c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66112-1.c
@@ -0,0 +1,16 @@
+/* PR target/66112 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+unsigned int
+foo (long long a, long long b)
+{
+  unsigned int res;
+  a &= ~0U;
+  b &= ~0U;
+  if (__builtin_mul_overflow (a, b, &res))
+    res = 0x123U;
+  return res;
+}
+
+/* { dg-final { scan-assembler "jn?o\[ \t\]" } } */