From: Bernd Schmidt <bernds@codesourcery.com>
Date: Wed, 6 Jul 2011 23:56:28 +0000 (+0000)
Subject: revert: simplify-rtx.c (simplify_const_binary_operation): Use the shift_truncation_ma... 
X-Git-Tag: releases/gcc-4.7.0~5563
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d58c1a38e5c0ce489f788694a079433dc4b2be61;p=thirdparty%2Fgcc.git

revert: simplify-rtx.c (simplify_const_binary_operation): Use the shift_truncation_mask hook instead of performing modulo by width.

	Revert:
	* simplify-rtx.c (simplify_const_binary_operation): Use the
	shift_truncation_mask hook instead of performing modulo by
	width.  Compare against mode precision, not bitsize.
	* combine.c (combine_simplify_rtx, simplify_shift_const_1):
	Use shift_truncation_mask instead of constructing the value
	manually.

From-SVN: r175949
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6c4d352053ae..9295bb4fcaa0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -44,6 +44,14 @@
 	simplify_comparison, record_promoted_value, simplify_compare_const,
 	record_dead_and_set_regs_1): Likewise.
 
+	Revert:
+	* simplify-rtx.c (simplify_const_binary_operation): Use the
+	shift_truncation_mask hook instead of performing modulo by
+	width.  Compare against mode precision, not bitsize.
+	* combine.c (combine_simplify_rtx, simplify_shift_const_1):
+	Use shift_truncation_mask instead of constructing the value
+	manually.
+
 2011-07-06  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000-protos.h (rs6000_call_indirect_aix): New
diff --git a/gcc/combine.c b/gcc/combine.c
index 787b0db98208..4dbf022fd1be 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -5939,7 +5939,9 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int in_dest,
       else if (SHIFT_COUNT_TRUNCATED && !REG_P (XEXP (x, 1)))
 	SUBST (XEXP (x, 1),
 	       force_to_mode (XEXP (x, 1), GET_MODE (XEXP (x, 1)),
-			      targetm.shift_truncation_mask (GET_MODE (x)),
+			      ((unsigned HOST_WIDE_INT) 1
+			       << exact_log2 (GET_MODE_BITSIZE (GET_MODE (x))))
+			      - 1,
 			      0));
       break;
 
@@ -9875,7 +9877,7 @@ simplify_shift_const_1 (enum rtx_code code, enum machine_mode result_mode,
      want to do this inside the loop as it makes it more difficult to
      combine shifts.  */
   if (SHIFT_COUNT_TRUNCATED)
-    orig_count &= targetm.shift_truncation_mask (mode);
+    orig_count &= GET_MODE_BITSIZE (mode) - 1;
 
   /* If we were given an invalid count, don't do anything except exactly
      what was requested.  */
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 5a98b69abbc9..82b818b02f1c 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -3768,8 +3768,8 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
 	     shift_truncation_mask, since the shift might not be part of an
 	     ashlM3, lshrM3 or ashrM3 instruction.  */
 	  if (SHIFT_COUNT_TRUNCATED)
-	    arg1 &= targetm.shift_truncation_mask (mode);
-	  else if (arg1 < 0 || arg1 >= GET_MODE_PRECISION (mode))
+	    arg1 = (unsigned HOST_WIDE_INT) arg1 % width;
+	  else if (arg1 < 0 || arg1 >= GET_MODE_BITSIZE (mode))
 	    return 0;
 
 	  val = (code == ASHIFT