re PR target/23376 (ICE on GCC 4.x with -O1 -funroll-loops -fvariable-expansion-in-unroller)

	PR target/23376
	* loop-unroll.c (analyze_insn_to_expand_var): Make sure that
	force_operand will work later on using have_insn_for.

From-SVN: r103181

gcc/ChangeLog

+2005-08-16  Steven Bosscher  <stevenb@suse.de>
+
+	PR target/23376
+	* loop-unroll.c (analyze_insn_to_expand_var): Make sure that
+	force_operand will work later on using have_insn_for.
+
 2005-08-16  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	* fold-const.c (tree_expr_nonnegative_p): Regroup cases.

gcc/fortran/ChangeLog

@@ -22,7 +22,7 @@
 	* trans-stmt.c (gfc_trans_arithmetic_if): Optimized in case of equal
 	labels.
 
-2005-09-11  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
+2005-08-11  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
 	    Steven Bosscher  <stevenb@suse.de>
 
 	PR libfortran/20006

gcc/loop-unroll.c

@@ -1574,7 +1574,19 @@ analyze_insn_to_expand_var (struct loop *loop, rtx insn)
       && GET_CODE (src) != MINUS
       && GET_CODE (src) != MULT)
     return NULL;
-  
+
+  /* Hmm, this is a bit paradoxical.  We know that INSN is a valid insn
+     in MD.  But if there is no optab to generate the insn, we can not
+     perform the variable expansion.  This can happen if an MD provides
+     an insn but not a named pattern to generate it, for example to avoid
+     producing code that needs additional mode switches like for x87/mmx.
+
+     So we check have_insn_for which looks for an optab for the operation
+     in SRC.  If it doesn't exist, we can't perform the expansion even
+     though INSN is valid.  */
+  if (!have_insn_for (GET_CODE (src), GET_MODE (src)))
+    return NULL;
+
   if (!XEXP (src, 0))
     return NULL;
   

gcc/testsuite/ChangeLog

+2005-08-16  Steven Bosscher  <stevenb@suse.de>
+
+	PR target/23376
+	* gcc.target/x86_64/pr23376.c: New test.
+
 2005-08-16  Ian Lance Taylor  <ian@airs.com>
 
 	PR c++/23337

gcc/testsuite/gcc.target/x86_64/pr23376.c

+/* { dg-do compile } */
+/* { dg-options "-O1 -funroll-loops -fvariable-expansion-in-unroller" } */
+
+typedef int __m64 __attribute__ ((__vector_size__ (8)));
+typedef int __v2si __attribute__ ((__vector_size__ (8)));
+
+static __inline __m64 __attribute__((__always_inline__))
+_mm_add_pi32 (__m64 __m1, __m64 __m2)
+{
+  return (__m64) __builtin_ia32_paddd ((__v2si)__m1, (__v2si)__m2);
+}
+
+__m64
+simple_block_diff_up_mmx_4 (const int width, __m64 ref1)
+{
+  __m64 sum;
+  int count = width >>1;
+  while (count--)
+    sum = _mm_add_pi32 (sum, ref1);
+  return sum;
+}