X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fstat%2Fconst_stat.c;h=ffa88a32b10a113d61e0648404d0d734e0a7bf99;hb=44faeb9742640d3498eb4482f98eb1255607c4d6;hp=1b0fad0c8e59512b0b173b53ab34686ee0967e90;hpb=2cc9db25f1d7780e24013ef1cc912a3cd770d7a5;p=libfirm

diff --git a/ir/stat/const_stat.c b/ir/stat/const_stat.c
index 1b0fad0c8..ffa88a32b 100644
--- a/ir/stat/const_stat.c
+++ b/ir/stat/const_stat.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
  *
  * This file is part of libFirm.
  *
@@ -69,23 +69,33 @@ static float_classify_t classify_float_value(tarval *tv) {
 	ir_mode *mode = get_tarval_mode(tv);
 
 	if (tv == get_mode_null(mode))
-		return STAT_FC_1;
+		return STAT_FC_0;
 	else if (tv == get_mode_one(mode))
 		return STAT_FC_1;
-
+	else if (tarval_is_finite(tv) && tarval_ieee754_zero_mantissa(tv)) {
+		int exp = tarval_ieee754_get_exponent(tv);
+
+		if (! tarval_is_negative(tv)) {
+			if (exp == 1)
+				return STAT_FC_2;
+			else if (exp == -1)
+				return STAT_FC_0_5;
+		}
+		return STAT_FC_POWER_OF_TWO;
+	}
 	return STAT_FC_OTHER;
 }
 
 /* return a human readable name for an float classification */
 const char *stat_fc_name(float_classify_t classification) {
 	switch (classification) {
-	case STAT_FC_0:     return "0.0";
-	case STAT_FC_1:     return "1.0";
-	case STAT_FC_2:     return "2.0";
-	case STAT_FC_0_5:   return "0.5";
-	case STAT_FC_EXACT: return "exact";
-	case STAT_FC_OTHER: return "other";
-	default:            return "<UNKNOWN>";
+	case STAT_FC_0:            return "0.0";
+	case STAT_FC_1:            return "1.0";
+	case STAT_FC_2:            return "2.0";
+	case STAT_FC_0_5:          return "0.5";
+	case STAT_FC_POWER_OF_TWO: return "2.0^x";
+	case STAT_FC_OTHER:        return "other";
+	default:                   return "<UNKNOWN>";
 	}
 }
 
@@ -95,6 +105,7 @@ void stat_update_const(stat_info_t *status, ir_node *node, graph_entry_t *graph)
 	ir_mode *mode = get_irn_mode(node);
 	tarval *tv;
 	unsigned bits;
+	(void) graph;
 
 	if (mode_is_int(mode)) {
 		tv   = get_Const_tarval(node);
@@ -121,7 +132,7 @@ void stat_update_const(stat_info_t *status, ir_node *node, graph_entry_t *graph)
 
 /* clears the const statistics for a new snapshot */
 void stat_const_clear(stat_info_t *status) {
-	int i;
+	size_t i;
 
 	for (i = 0; i < ARR_SIZE(status->const_info.int_bits_count); ++i)
 		cnt_clr(&status->const_info.int_bits_count[i]);
@@ -134,5 +145,6 @@ void stat_const_clear(stat_info_t *status) {
 
 /* initialize the Const statistic. */
 void stat_init_const_cnt(stat_info_t *status) {
+	(void) status;
 	/* currently nothing */
 }