From: Siddhesh Poyarekar <siddhesh@redhat.com>
Date: Thu, 7 Mar 2013 07:48:56 +0000 (+0530)
Subject: Use an intermediate variable to sum exponents in powerpc __mul and __sqr
X-Git-Tag: glibc-2.18~579
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6ebd4a7d5de4c5afcede367483051e55363b18f;p=thirdparty%2Fglibc.git

Use an intermediate variable to sum exponents in powerpc __mul and __sqr
---

diff --git a/ChangeLog b/ChangeLog
index f10a14684b8..75841387ff0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2013-03-07  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
+	* sysdeps/powerpc/powerpc32/power4/fpu/mpa.c (__mul): Use
+	intermediate variable to calculate exponent.
+	(__sqr): Likewise.
+	* sysdeps/powerpc/powerpc64/power4/fpu/mpa.c (__mul):
+	Likewise.
+	(__sqr): Likewise.
+
 	* sysdeps/ieee754/dbl-64/mpa.c [!NO__MUL]: Define __mul.
 	[!NO__SQR]: Define __sqr.
 	* sysdeps/powerpc/powerpc32/power4/fpu/mpa.c: define NO__MUL
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/mpa.c b/sysdeps/powerpc/powerpc32/power4/fpu/mpa.c
index ef7ada749a7..1858c974070 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/mpa.c
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/mpa.c
@@ -99,16 +99,16 @@ __mul (const mp_no *x, const mp_no *y, mp_no *z, int p)
     }
   Z[k] = zk;
 
+  int e = EX + EY;
   /* Is there a carry beyond the most significant digit?  */
   if (Z[1] == ZERO)
     {
       for (i = 1; i <= p2; i++)
 	Z[i] = Z[i + 1];
-      EZ = EX + EY - 1;
+      e--;
     }
-  else
-    EZ = EX + EY;
 
+  EZ = e;
   Z[0] = X[0] * Y[0];
 }
 
@@ -202,12 +202,13 @@ __sqr (const mp_no *x, mp_no *y, int p)
   /* Squares are always positive.  */
   Y[0] = 1.0;
 
-  EY = 2 * EX;
+  int e = EX * 2;
   /* Is there a carry beyond the most significant digit?  */
   if (__glibc_unlikely (Y[1] == ZERO))
     {
       for (i = 1; i <= p; i++)
 	Y[i] = Y[i + 1];
-      EY--;
+      e--;
     }
+  EY = e;
 }
diff --git a/sysdeps/powerpc/powerpc64/power4/fpu/mpa.c b/sysdeps/powerpc/powerpc64/power4/fpu/mpa.c
index ef7ada749a7..1858c974070 100644
--- a/sysdeps/powerpc/powerpc64/power4/fpu/mpa.c
+++ b/sysdeps/powerpc/powerpc64/power4/fpu/mpa.c
@@ -99,16 +99,16 @@ __mul (const mp_no *x, const mp_no *y, mp_no *z, int p)
     }
   Z[k] = zk;
 
+  int e = EX + EY;
   /* Is there a carry beyond the most significant digit?  */
   if (Z[1] == ZERO)
     {
       for (i = 1; i <= p2; i++)
 	Z[i] = Z[i + 1];
-      EZ = EX + EY - 1;
+      e--;
     }
-  else
-    EZ = EX + EY;
 
+  EZ = e;
   Z[0] = X[0] * Y[0];
 }
 
@@ -202,12 +202,13 @@ __sqr (const mp_no *x, mp_no *y, int p)
   /* Squares are always positive.  */
   Y[0] = 1.0;
 
-  EY = 2 * EX;
+  int e = EX * 2;
   /* Is there a carry beyond the most significant digit?  */
   if (__glibc_unlikely (Y[1] == ZERO))
     {
       for (i = 1; i <= p; i++)
 	Y[i] = Y[i + 1];
-      EY--;
+      e--;
     }
+  EY = e;
 }