From: Richard Henderson <rth@redhat.com>
Date: Wed, 12 Dec 2001 03:00:01 +0000 (-0800)
Subject: expmed.c (expand_divmod): Ignore sdiv_pow2_cheap for modes in which there is no divid... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a8c7e72da252fa6d01037d70d9bf24f9af37b07d;p=gcc.git

expmed.c (expand_divmod): Ignore sdiv_pow2_cheap for modes in which there is no divide expander.

        * expmed.c (expand_divmod): Ignore sdiv_pow2_cheap for modes in
        which there is no divide expander.

From-SVN: r47916
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 95d55b1e84d..47d63a612ac 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-12-11  Richard Henderson  <rth@redhat.com>
+
+	* expmed.c (expand_divmod): Ignore sdiv_pow2_cheap for modes in
+	which there is no divide expander.
+
 2001-12-11  Richard Henderson  <rth@redhat.com>
 
 	* except.c (sjlj_find_directly_reachable_regions): Don't
diff --git a/gcc/expmed.c b/gcc/expmed.c
index 8a7b6b91d55..8eecca34efa 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -3271,7 +3271,16 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
 		      goto fail1;
 		  }
 		else if (EXACT_POWER_OF_2_OR_ZERO_P (d)
-			 && (rem_flag ? smod_pow2_cheap : sdiv_pow2_cheap))
+			 && (rem_flag ? smod_pow2_cheap : sdiv_pow2_cheap)
+			 /* ??? The cheap metric is computed only for
+			    word_mode.  If this operation is wider, this may
+			    not be so.  Assume true if the optab has an
+			    expander for this mode.  */
+			 && (((rem_flag ? smod_optab : sdiv_optab)
+			      ->handlers[(int) compute_mode].insn_code
+			      != CODE_FOR_nothing)
+			     || (sdivmod_optab->handlers[(int) compute_mode]
+				 .insn_code != CODE_FOR_nothing)))
 		  ;
 		else if (EXACT_POWER_OF_2_OR_ZERO_P (abs_d))
 		  {