re PR c/59708 (clang-compatible checked arithmetic builtins)

PR c/59708 * expmed.c (expand_widening_mult): Return const0_rtx if coeff is 0. From-SVN: r218331

re PR c/59708 (clang-compatible checked arithmetic builtins)
PR c/59708 * expmed.c (expand_widening_mult): Return const0_rtx if coeff is 0. From-SVN: r218331
e9082138 · Jakub Jelinek · Jakub Jelinek · c3d79243 · e9082138 · e9082138
Commit e9082138 authored Dec 03, 2014 by Jakub Jelinek Committed by Jakub Jelinek Dec 03, 2014
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gcc/expmed.c
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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
 2014-12-03  Jakub Jelinek  <jakub@redhat.com>

+	PR c/59708
+	* expmed.c (expand_widening_mult): Return const0_rtx if
+	coeff is 0.
+
 	* doc/gimple.texi (gimple_build_assign_with_ops): Remove.
 	(gimple_build_assign): Document the new overloads.

--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -3289,6 +3289,9 @@ expand_widening_mult (machine_mode mode, rtx op0, rtx op1, rtx target,
      enum mult_variant variant;
      struct algorithm algorithm;

+      if (coeff == 0)
+	return CONST0_RTX (mode);
+
      /* Special case powers of two.  */
      if (EXACT_POWER_OF_2_OR_ZERO_P (coeff))
 	{