re PR target/27158 (ICE in extract_insn with -maltivec)

	PR target/27158
	* config/rs6000/rs6000.c (const_vector_elt_as_int): New function to
	extract a CONST_VECTOR element and interpret it as an integer.
	(vspltis_constant): Use const_vector_elt_as_int instead of the
	macro CONST_VECTOR_ELT in order to handle FP vector modes.
	* config/rs6000/predicates.md (easy_vector_const): Consider
	floating point ALTIVEC_VECTOR_MODEs via easy_altivec_constant.

From-SVN: r114558

gcc/ChangeLog

+2006-06-11  Roger Sayle  <roger@eyesopen.com>
+
+	PR target/27158
+	* config/rs6000/rs6000.c (const_vector_elt_as_int): New function to
+	extract a CONST_VECTOR element and interpret it as an integer.
+	(vspltis_constant): Use const_vector_elt_as_int instead of the
+	macro CONST_VECTOR_ELT in order to handle FP vector modes.
+	* config/rs6000/predicates.md (easy_vector_const): Consider
+	floating point ALTIVEC_VECTOR_MODEs via easy_altivec_constant.
+
 2006-06-11  Kaz Kojima  <kkojima@gcc.gnu.org>
 
 	PR middle-end/27942

gcc/config/rs6000/predicates.md

@@ -278,9 +278,6 @@
     {
       if (zero_constant (op, mode))
         return true;
-      if (GET_MODE_CLASS (mode) != MODE_VECTOR_INT)
-        return false;
-
       return easy_altivec_constant (op, mode);
     }
 

gcc/config/rs6000/rs6000.c

@@ -2122,6 +2122,20 @@ num_insns_constant (rtx op, enum machine_mode mode)
     }
 }
 
+/* Interpret element ELT of the CONST_VECTOR OP as an integer value.
+   If the mode of OP is MODE_VECTOR_INT, this simply returns the
+   corresponding element of the vector, but for V4SFmode and V2SFmode,
+   the corresponding "float" is interpreted as an SImode integer.  */
+
+static HOST_WIDE_INT
+const_vector_elt_as_int (rtx op, unsigned int elt)
+{
+  rtx tmp = CONST_VECTOR_ELT (op, elt);
+  if (GET_MODE (op) == V4SFmode
+      || GET_MODE (op) == V2SFmode)
+    tmp = gen_lowpart (SImode, tmp);
+  return INTVAL (tmp);
+}
 
 /* Return true if OP can be synthesized with a particular vspltisb, vspltish
    or vspltisw instruction.  OP is a CONST_VECTOR.  Which instruction is used
@@ -2141,8 +2155,7 @@ vspltis_constant (rtx op, unsigned step, unsigned copies)
   unsigned bitsize = GET_MODE_BITSIZE (inner);
   unsigned mask = GET_MODE_MASK (inner);
 
-  rtx last = CONST_VECTOR_ELT (op, nunits - 1);
-  HOST_WIDE_INT val = INTVAL (last);
+  HOST_WIDE_INT val = const_vector_elt_as_int (op, nunits - 1);
   HOST_WIDE_INT splat_val = val;
   HOST_WIDE_INT msb_val = val > 0 ? 0 : -1;
 
@@ -2182,7 +2195,7 @@ vspltis_constant (rtx op, unsigned step, unsigned copies)
       else
 	desired_val = msb_val;
 
-      if (desired_val != INTVAL (CONST_VECTOR_ELT (op, i)))
+      if (desired_val != const_vector_elt_as_int (op, i))
 	return false;
     }