commit 69397542d6e5372703f29aa99ba07aa15e787fe0
author pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162> Fri Dec 19 12:59:28 2008 +0000
committer pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162> Fri Dec 19 12:59:28 2008 +0000
tree 2780ad787b4a0433d4e2af58b4b9c0e0878c91b3
parent 731abc0d2284b957fdf77e76ef34eff1bd0a5bc1

Correctly normalize values and handle zero inputs to scalbn functions.

Signed-off-by: Paul Brook <paul@codesourcery.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6102 c046a42c-6fe2-441c-8c8c-71466251a162

fpu/softfloat.c

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 3988bd1..e66a5d4 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -5479,8 +5479,14 @@
     if ( aExp == 0xFF ) {
         return a;
     }
-    aExp += n;
-    return roundAndPackFloat32( aSign, aExp, aSig STATUS_VAR );
+    if ( aExp != 0 )
+        aSig |= 0x00800000;
+    else if ( aSig == 0 )
+        return a;
+
+    aExp += n - 1;
+    aSig <<= 7;
+    return normalizeRoundAndPackFloat32( aSign, aExp, aSig STATUS_VAR );
 }
 
 float64 float64_scalbn( float64 a, int n STATUS_PARAM )
@@ -5496,8 +5502,14 @@
     if ( aExp == 0x7FF ) {
         return a;
     }
-    aExp += n;
-    return roundAndPackFloat64( aSign, aExp, aSig STATUS_VAR );
+    if ( aExp != 0 )
+        aSig |= LIT64( 0x0010000000000000 );
+    else if ( aSig == 0 )
+        return a;
+
+    aExp += n - 1;
+    aSig <<= 10;
+    return normalizeRoundAndPackFloat64( aSign, aExp, aSig STATUS_VAR );
 }
 
 #ifdef FLOATX80
@@ -5514,9 +5526,12 @@
     if ( aExp == 0x7FF ) {
         return a;
     }
+    if (aExp == 0 && aSig == 0)
+        return a;
+
     aExp += n;
-    return roundAndPackFloatx80( STATUS(floatx80_rounding_precision),
-                                 aSign, aExp, aSig, 0 STATUS_VAR );
+    return normalizeRoundAndPackFloatx80( STATUS(floatx80_rounding_precision),
+                                          aSign, aExp, aSig, 0 STATUS_VAR );
 }
 #endif
 
@@ -5534,8 +5549,14 @@
     if ( aExp == 0x7FFF ) {
         return a;
     }
-    aExp += n;
-    return roundAndPackFloat128( aSign, aExp, aSig0, aSig1, 0 STATUS_VAR );
+    if ( aExp != 0 )
+        aSig0 |= LIT64( 0x0001000000000000 );
+    else if ( aSig0 == 0 && aSig1 == 0 )
+        return a;
+
+    aExp += n - 1;
+    return normalizeRoundAndPackFloat128( aSign, aExp, aSig0, aSig1
+                                          STATUS_VAR );
 
 }
 #endif