re PR tree-optimization/49963 (ICE: in abs_hwi, at hwint.c:108)

2011-08-18  Paolo Carlini  <paolo.carlini@oracle.com>
	    Joseph Myers  <joseph@codesourcery.com>

	PR tree-optimization/49963
	* hwint.c (absu_hwi): Define.
	* hwint.h (absu_hwi): Declare.
	* fold-const.c (fold_plusminus_mult_expr): Use absu_hwi instead
	of abs_hwi.
	* tree-ssa-math-opts.c (gimple_expand_builtin_pow): Likewise.
	* tree-ssa-loop-prefetch.c (prune_ref_by_group_reuse): Likewise.

Co-Authored-By: Joseph Myers <joseph@codesourcery.com>

From-SVN: r177848

6 files changed, 28 insertions, 8 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8e768f8538a..c46e1ee08b3 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,14 @@
+2011-08-18  Paolo Carlini  <paolo.carlini@oracle.com>
+	    Joseph Myers  <joseph@codesourcery.com>
+
+	PR tree-optimization/49963
+	* hwint.c (absu_hwi): Define.
+	* hwint.h (absu_hwi): Declare.
+	* fold-const.c (fold_plusminus_mult_expr): Use absu_hwi instead
+	of abs_hwi.
+	* tree-ssa-math-opts.c (gimple_expand_builtin_pow): Likewise.
+	* tree-ssa-loop-prefetch.c (prune_ref_by_group_reuse): Likewise.
+
 2011-08-18  Richard Guenther  <rguenther@suse.de>
 
 	* expr.c (get_inner_reference): Sign-extend the constant
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index a73b1e6a9ba..dcd6989b285 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -7036,7 +7036,7 @@ fold_plusminus_mult_expr (location_t loc, enum tree_code code, tree type,
       int11 = TREE_INT_CST_LOW (arg11);
 
       /* Move min of absolute values to int11.  */
-      if (abs_hwi (int01) < abs_hwi (int11))
+      if (absu_hwi (int01) < absu_hwi (int11))
         {
 	  tmp = int01, int01 = int11, int11 = tmp;
 	  alt0 = arg00, arg00 = arg10, arg10 = alt0;
@@ -7046,7 +7046,7 @@ fold_plusminus_mult_expr (location_t loc, enum tree_code code, tree type,
       else
 	maybe_same = arg11;
 
-      if (exact_log2 (abs_hwi (int11)) > 0 && int01 % int11 == 0
+      if (exact_log2 (absu_hwi (int11)) > 0 && int01 % int11 == 0
 	  /* The remainder should not be a constant, otherwise we
 	     end up folding i * 4 + 2 to (i * 2 + 1) * 2 which has
 	     increased the number of multiplications necessary.  */
diff --git a/gcc/hwint.c b/gcc/hwint.c
index a128dc134f9..533133c7b4d 100644
--- a/gcc/hwint.c
+++ b/gcc/hwint.c
@@ -109,6 +109,14 @@ abs_hwi (HOST_WIDE_INT x)
   return x >= 0 ? x : -x;
 }
 
+/* Compute the absolute value of X as an unsigned type.  */
+
+unsigned HOST_WIDE_INT
+absu_hwi (HOST_WIDE_INT x)
+{
+  return x >= 0 ? (unsigned HOST_WIDE_INT)x : -(unsigned HOST_WIDE_INT)x;
+}
+
 /* Compute the greatest common divisor of two numbers A and B using
    Euclid's algorithm.  */
 
diff --git a/gcc/hwint.h b/gcc/hwint.h
index fa77b112349..c8b3c31bfb7 100644
--- a/gcc/hwint.h
+++ b/gcc/hwint.h
@@ -233,6 +233,7 @@ exact_log2 (unsigned HOST_WIDE_INT x)
 #define HOST_WIDE_INT_MAX (~(HOST_WIDE_INT_MIN))
 
 extern HOST_WIDE_INT abs_hwi (HOST_WIDE_INT);
+extern unsigned HOST_WIDE_INT absu_hwi (HOST_WIDE_INT);
 extern HOST_WIDE_INT gcd (HOST_WIDE_INT, HOST_WIDE_INT);
 extern HOST_WIDE_INT pos_mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 extern HOST_WIDE_INT mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c
index 82634cce078..c5ad1c4765f 100644
--- a/gcc/tree-ssa-loop-prefetch.c
+++ b/gcc/tree-ssa-loop-prefetch.c
@@ -795,7 +795,7 @@ prune_ref_by_group_reuse (struct mem_ref *ref, struct mem_ref *by,
       prefetch_before = (hit_from - delta_r + step - 1) / step;
 
       /* Do not reduce prefetch_before if we meet beyond cache size.  */
-      if (prefetch_before > (unsigned) abs_hwi (L2_CACHE_SIZE_BYTES / step))
+      if (prefetch_before > absu_hwi (L2_CACHE_SIZE_BYTES / step))
         prefetch_before = PREFETCH_ALL;
       if (prefetch_before < ref->prefetch_before)
 	ref->prefetch_before = prefetch_before;
diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c
index 63cc175eadd..db4ec44c331 100644
--- a/gcc/tree-ssa-math-opts.c
+++ b/gcc/tree-ssa-math-opts.c
@@ -1231,7 +1231,7 @@ gimple_expand_builtin_pow (gimple_stmt_iterator *gsi, location_t loc,
       /* Attempt to fold powi(arg0, abs(n/2)) into multiplies.  If not
          possible or profitable, give up.  Skip the degenerate case when
          n is 1 or -1, where the result is always 1.  */
-      if (abs_hwi (n) != 1)
+      if (absu_hwi (n) != 1)
 	{
 	  powi_x_ndiv2 = gimple_expand_builtin_powi (gsi, loc, arg0,
 						     abs_hwi (n / 2));
@@ -1243,7 +1243,7 @@ gimple_expand_builtin_pow (gimple_stmt_iterator *gsi, location_t loc,
 	 result of the optimal multiply sequence just calculated.  */
       sqrt_arg0 = build_and_insert_call (gsi, loc, &target, sqrtfn, arg0);
 
-      if (abs_hwi (n) == 1)
+      if (absu_hwi (n) == 1)
 	result = sqrt_arg0;
       else
 	result = build_and_insert_binop (gsi, loc, target, MULT_EXPR,
@@ -1285,7 +1285,7 @@ gimple_expand_builtin_pow (gimple_stmt_iterator *gsi, location_t loc,
       /* Attempt to fold powi(arg0, abs(n/3)) into multiplies.  If not
          possible or profitable, give up.  Skip the degenerate case when
          abs(n) < 3, where the result is always 1.  */
-      if (abs_hwi (n) >= 3)
+      if (absu_hwi (n) >= 3)
 	{
 	  powi_x_ndiv3 = gimple_expand_builtin_powi (gsi, loc, arg0,
 						     abs_hwi (n / 3));
@@ -1298,14 +1298,14 @@ gimple_expand_builtin_pow (gimple_stmt_iterator *gsi, location_t loc,
          either cbrt(x) or cbrt(x) * cbrt(x).  */
       cbrt_x = build_and_insert_call (gsi, loc, &target, cbrtfn, arg0);
 
-      if (abs_hwi (n) % 3 == 1)
+      if (absu_hwi (n) % 3 == 1)
 	powi_cbrt_x = cbrt_x;
       else
 	powi_cbrt_x = build_and_insert_binop (gsi, loc, target, MULT_EXPR,
 					      cbrt_x, cbrt_x);
 
       /* Multiply the two subexpressions, unless powi(x,abs(n)/3) = 1.  */
-      if (abs_hwi (n) < 3)
+      if (absu_hwi (n) < 3)
 	result = powi_cbrt_x;
       else
 	result = build_and_insert_binop (gsi, loc, target, MULT_EXPR,