From: Christoph Mallon <christoph.mallon@gmx.de>
Date: Tue, 11 Sep 2007 11:53:49 +0000 (+0000)
Subject: Handle left shift (when magnitude > mantissa) when converting float constants to... 
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=117f69473fd6a80923a26aff2772341ebf9403dd;p=libfirm

Handle left shift (when magnitude > mantissa) when converting float constants to int.

[r15744]
---

diff --git a/ir/tv/fltcalc.c b/ir/tv/fltcalc.c
index ca16d7f3a..bed4dac97 100644
--- a/ir/tv/fltcalc.c
+++ b/ir/tv/fltcalc.c
@@ -1651,9 +1651,13 @@ int fc_flt2int(const fp_value *a, void *result, ir_mode *dst_mode) {
 		}
 
 		assert(exp_val >= 0 && "floating point value not integral before fc_flt2int() call");
-		shift = a->desc.mantissa_size - exp_val + 2;
+		shift = exp_val - a->desc.mantissa_size - 2;
 
-		sc_shrI(_mant(a), shift, 64, 0, result);
+		if (shift > 0) {
+			sc_shlI(_mant(a),  shift, 64, 0, result);
+		} else {
+			sc_shrI(_mant(a), -shift, 64, 0, result);
+		}
 
 		/* check for overflow */
 		highest = sc_get_highest_set_bit(result);
diff --git a/ir/tv/strcalc.c b/ir/tv/strcalc.c
index 3fb6ab37d..dc6879645 100644
--- a/ir/tv/strcalc.c
+++ b/ir/tv/strcalc.c
@@ -1646,9 +1646,7 @@ void sc_divmod(const void *value1, const void *value2, void *div_buffer, void *m
 }
 
 
-void sc_shl(const void *val1, const void *val2, int radius, int sign, void *buffer) {
-	long offset = sc_val_to_long(val2);
-
+void sc_shlI(const void *val1, long offset, int radius, int sign, void *buffer) {
 	carry_flag = 0;
 
 	DEBUGPRINTF_COMPUTATION(("%s << %ld ", sc_print_hex(value1), offset));
@@ -1661,6 +1659,12 @@ void sc_shl(const void *val1, const void *val2, int radius, int sign, void *buff
 	}
 }
 
+void sc_shl(const void *val1, const void *val2, int radius, int sign, void *buffer) {
+	long offset = sc_val_to_long(val2);
+
+	sc_shlI(val1, offset, radius, sign, buffer);
+}
+
 void sc_shrI(const void *val1, long offset, int radius, int sign, void *buffer) {
 	carry_flag = 0;
 
diff --git a/ir/tv/strcalc.h b/ir/tv/strcalc.h
index 1b6261911..ec666bc9b 100644
--- a/ir/tv/strcalc.h
+++ b/ir/tv/strcalc.h
@@ -143,6 +143,11 @@ void sc_mod(const void *value1, const void *value2, void *buffer);
  */
 void sc_divmod(const void *value1, const void *value2, void *div_buffer, void *mod_buffer);
 
+/**
+ * buffer = value1 << offset
+ */
+void sc_shlI(const void *val1, long offset, int radius, int sign, void *buffer);
+
 /**
  * buffer = value1 << value2
  */