From f14bd805a73308dd187d9fc768358a07a8efc54a Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Mon, 19 Feb 2001 23:16:05 +0000
Subject: [PATCH] Update.

	* sysdeps/ieee754/flt-32/e_powf.c: Handle x == +-1 correctly.
	* sysdeps/ieee754/dbl-64/e_pow.c: Likewise.
---
 ChangeLog                       | 3 +++
 sysdeps/ieee754/dbl-64/e_pow.c  | 4 ++++
 sysdeps/ieee754/flt-32/e_powf.c | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 47e5e83954..c099012972 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2001-02-19  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/ieee754/flt-32/e_powf.c: Handle x == +-1 correctly.
+	* sysdeps/ieee754/dbl-64/e_pow.c: Likewise.
+
 	* sysdeps/generic/e_scalb.c: Set invalid exception for invalid
 	parameters.
 	* sysdeps/generic/e_scalbf.c: New file.
diff --git a/sysdeps/ieee754/dbl-64/e_pow.c b/sysdeps/ieee754/dbl-64/e_pow.c
index 1e1496f00d..73e8f471f6 100644
--- a/sysdeps/ieee754/dbl-64/e_pow.c
+++ b/sysdeps/ieee754/dbl-64/e_pow.c
@@ -149,6 +149,10 @@ C[] = {
     /* y==zero: x**0 = 1 */
 	if((iy|ly)==0) return C[1];
 
+    /* x==+-1 */
+	if(x == 1.0) return C[1];
+	if(x == -1.0 && isinf(y)) return C[1];
+
     /* +-NaN return x+y */
 	if(ix > 0x7ff00000 || ((ix==0x7ff00000)&&(lx!=0)) ||
 	   iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0)))
diff --git a/sysdeps/ieee754/flt-32/e_powf.c b/sysdeps/ieee754/flt-32/e_powf.c
index 4798340c84..9f520804a4 100644
--- a/sysdeps/ieee754/flt-32/e_powf.c
+++ b/sysdeps/ieee754/flt-32/e_powf.c
@@ -76,6 +76,10 @@ ivln2_l  =  7.0526075433e-06; /* 0x36eca570 =1/ln2 tail*/
     /* y==zero: x**0 = 1 */
 	if(iy==0) return one;
 
+    /* x==+-1 */
+	if(x == 1.0) return one;
+	if(x == -1.0 && isinf(y)) return one;
+
     /* +-NaN return x+y */
 	if(ix > 0x7f800000 ||
 	   iy > 0x7f800000)