expmed.c (init_expmed): A signed modulus by a power of two is considered cheap if...

* expmed.c (init_expmed): A signed modulus by a power of two is considered cheap if its less than or equal to four instructions. From-SVN: r85134

expmed.c (init_expmed): A signed modulus by a power of two is considered cheap if...
* expmed.c (init_expmed): A signed modulus by a power of two is considered cheap if its less than or equal to four instructions. From-SVN: r85134
8b91e18c · Roger Sayle · Roger Sayle · c32118f9 · 8b91e18c · 8b91e18c
Commit 8b91e18c authored Jul 25, 2004 by Roger Sayle Committed by Roger Sayle Jul 25, 2004
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gcc/ChangeLog
+5 -0

gcc/expmed.c
+1 -1

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2004-07-24  Roger Sayle  <roger@eyesopen.com>
+
+	* expmed.c (init_expmed): A signed modulus by a power of two is
+	considered cheap if its less than or equal to four instructions.
+
 2004-07-25  Bernardo Innocenti  <bernie@develer.com>

 	* ggc.h (GGC_NEW, GGC_CNEW, GGC_NEWVEC, GGC_CNEWVEC, GGC_NEWVAR,

--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -217,7 +217,7 @@ init_expmed (void)
      mul_cost[mode] = rtx_cost (&all.mult, SET);

      sdiv_pow2_cheap[mode] = (rtx_cost (&all.div, SET) <= 2 * add_cost[mode]);
-      smod_pow2_cheap[mode] = (rtx_cost (&all.mod, SET) <= 2 * add_cost[mode]);
+      smod_pow2_cheap[mode] = (rtx_cost (&all.mod, SET) <= 4 * add_cost[mode]);

      wider_mode = GET_MODE_WIDER_MODE (mode);
      if (wider_mode != VOIDmode)