From: Richard Henderson <rth@redhat.com>
Date: Wed, 27 Jun 2012 03:20:08 +0000 (-0700)
Subject: i386: Correct costs on CONST_DOUBLE and CONST_VECTOR
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a247af8371ad9ad4e244cf664ed33ca7d945b768;p=gcc.git

i386: Correct costs on CONST_DOUBLE and CONST_VECTOR

We were always falling through to the memory default.
Also use standard_sse_constant_p on CONST_VECTOR.

        * config/i386/i386.c (ix86_rtx_costs): Use standard_sse_constant_p
        and don't fall thru from standard_80387_constant_p to the memory
        fallback,

From-SVN: r189007
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2eb52597665..1d98b79c720 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-06-26  Richard Henderson  <rth@redhat.com>
+
+	* config/i386/i386.c (ix86_rtx_costs): Use standard_sse_constant_p
+	and don't fall thru from standard_80387_constant_p to the memory
+	fallback,
+
 2012-06-26  Richard Henderson  <rth@redhat.com>
 
 	* config/i386/i386.c (bdesc_args): Update.  Change
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index b96fc6e5371..edfc6498d73 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -32102,24 +32102,38 @@ ix86_rtx_costs (rtx x, int code_i, int outer_code_i, int opno, int *total,
 
     case CONST_DOUBLE:
       if (mode == VOIDmode)
-	*total = 0;
-      else
-	switch (standard_80387_constant_p (x))
-	  {
-	  case 1: /* 0.0 */
-	    *total = 1;
-	    break;
-	  default: /* Other constants */
-	    *total = 2;
-	    break;
-	  case 0:
-	  case -1:
-	    break;
-	  }
-      /* FALLTHRU */
-
+	{
+	  *total = 0;
+	  return true;
+	}
+      switch (standard_80387_constant_p (x))
+	{
+	case 1: /* 0.0 */
+	  *total = 1;
+	  return true;
+	default: /* Other constants */
+	  *total = 2;
+	  return true;
+	case 0:
+	case -1:
+	  break;
+	}
+      if (SSE_FLOAT_MODE_P (mode))
+	{
     case CONST_VECTOR:
-      /* Start with (MEM (SYMBOL_REF)), since that's where
+	  switch (standard_sse_constant_p (x))
+	    {
+	    case 0:
+	      break;
+	    case 1:  /* 0: xor eliminates false dependency */
+	      *total = 0;
+	      return true;
+	    default: /* -1: cmp contains false dependency */
+	      *total = 1;
+	      return true;
+	    }
+	}
+      /* Fall back to (MEM (SYMBOL_REF)), since that's where
 	 it'll probably end up.  Add a penalty for size.  */
       *total = (COSTS_N_INSNS (1)
 		+ (flag_pic != 0 && !TARGET_64BIT)