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GNU C Library master sources branch ibm/2.19/master updated. glibc-2.19-25-ge266b71

From: azanella at sourceware dot org
To: glibc-cvs at sourceware dot org
Date: 2 Apr 2014 12:25:32 -0000
Subject: GNU C Library master sources branch ibm/2.19/master updated. glibc-2.19-25-ge266b71
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The branch, ibm/2.19/master has been updated
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       via  acd56f757b4e5ab8737b9564bd7a4ad1009acd8d (commit)
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e266b71770050a4d0cb276f4afea1c5b05215184

commit e266b71770050a4d0cb276f4afea1c5b05215184
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Apr 2 13:46:19 2014 +1030

    Correct IBM long double nextafterl.
    
    Fix for values near a power of two, and some tidies.
    
    	[BZ #16739]
    	* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (__nextafterl): Correct
    	output when value is near a power of two.  Use int64_t for lx and
    	remove casts.  Use decimal rather than hex exponent constants.
    	Don't use long double multiplication when double will suffice.
    	* math/libm-test.inc (nextafter_test_data): Add tests.
    	* NEWS: Add 16739 and 16786 to bug list.
    
    Backport of b0abbc21034f0e5edc49023d8fda0616173faf17.

diff --git a/ChangeLog b/ChangeLog
index fe00e0c..5bf3e26 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2014-04-02  Alan Modra  <amodra@gmail.com>
 
+	[BZ #16739]
+	* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (__nextafterl): Correct
+	output when value is near a power of two.  Use int64_t for lx and
+	remove casts.  Use decimal rather than hex exponent constants.
+	Don't use long double multiplication when double will suffice.
+	* math/libm-test.inc (nextafter_test_data): Add tests.
+	* NEWS: Add 16739 and 16786 to bug list.
+
+2014-04-02  Alan Modra  <amodra@gmail.com>
+
 	* sysdeps/powerpc/powerpc64/power7/memrchr.S: Correct stream hint.
 
 2014-04-02  Alan Modra  <amodra@gmail.com>
diff --git a/NEWS b/NEWS
index a647e5d..71f6fb6 100644
--- a/NEWS
+++ b/NEWS
@@ -9,7 +9,7 @@ Version 2.19.1
 
 * The following bugs are resolved with this release:
 
-  16545, 16683, 16689, 16701, 16706, 16707.
+  16545, 16683, 16689, 16701, 16706, 16707, 16739.
 
 Version 2.19
 
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 1c9b97a..cf07069 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -10547,6 +10547,14 @@ static const struct test_ff_f_data nextafter_test_data[] =
     // XXX Enable once gcc is fixed.
     //TEST_ff_f (nextafter, 0x0.00000040000000000000p-16385L, -0.1L, 0x0.0000003ffffffff00000p-16385L),
 #endif
+#if defined TEST_LDOUBLE && LDBL_MANT_DIG == 106
+    TEST_ff_f (nextafter, 1.0L, -10.0L, 1.0L-0x1p-106L, NO_EXCEPTION),
+    TEST_ff_f (nextafter, 1.0L, 10.0L, 1.0L+0x1p-105L, NO_EXCEPTION),
+    TEST_ff_f (nextafter, 1.0L-0x1p-106L, 10.0L, 1.0L, NO_EXCEPTION),
+    TEST_ff_f (nextafter, -1.0L, -10.0L, -1.0L-0x1p-105L, NO_EXCEPTION),
+    TEST_ff_f (nextafter, -1.0L, 10.0L, -1.0L+0x1p-106L, NO_EXCEPTION),
+    TEST_ff_f (nextafter, -1.0L+0x1p-106L, -10.0L, -1.0L, NO_EXCEPTION),
+#endif
 
     /* XXX We need the hexadecimal FP number representation here for further
        tests.  */
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
index c050944..7b09927 100644
--- a/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
@@ -30,8 +30,7 @@ static char rcsid[] = "$NetBSD: $";
 
 long double __nextafterl(long double x, long double y)
 {
-	int64_t hx,hy,ihx,ihy;
-	uint64_t lx;
+	int64_t hx, hy, ihx, ihy, lx;
 	double xhi, xlo, yhi;
 
 	ldbl_unpack (x, &xhi, &xlo);
@@ -76,19 +75,28 @@ long double __nextafterl(long double x, long double y)
 	      u = math_opt_barrier (x);
 	      x -= __LDBL_DENORM_MIN__;
 	      if (ihx < 0x0360000000000000LL
-		  || (hx > 0 && (int64_t) lx <= 0)
-		  || (hx < 0 && (int64_t) lx > 1)) {
+		  || (hx > 0 && lx <= 0)
+		  || (hx < 0 && lx > 1)) {
 		u = u * u;
 		math_force_eval (u);		/* raise underflow flag */
 	      }
 	      return x;
 	    }
-	    if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
-	      INSERT_WORDS64 (yhi, hx & (0x7ffLL<<52));
-	      u = yhi;
-	      u *= 0x1.0000000000000p-105L;
+	    /* If the high double is an exact power of two and the low
+	       double is the opposite sign, then 1ulp is one less than
+	       what we might determine from the high double.  Similarly
+	       if X is an exact power of two, and positive, because
+	       making it a little smaller will result in the exponent
+	       decreasing by one and normalisation of the mantissa.   */
+	    if ((hx & 0x000fffffffffffffLL) == 0
+		&& ((lx != 0 && (hx ^ lx) < 0)
+		    || (lx == 0 && hx >= 0)))
+	      ihx -= 1LL << 52;
+	    if (ihx < (106LL << 52)) { /* ulp will denormal */
+	      INSERT_WORDS64 (yhi, ihx & (0x7ffLL<<52));
+	      u = yhi * 0x1p-105;
 	    } else {
-	      INSERT_WORDS64 (yhi, (hx & (0x7ffLL<<52))-(0x069LL<<52));
+	      INSERT_WORDS64 (yhi, (ihx & (0x7ffLL<<52))-(105LL<<52));
 	      u = yhi;
 	    }
 	    return x - u;
@@ -103,8 +111,8 @@ long double __nextafterl(long double x, long double y)
 	      u = math_opt_barrier (x);
 	      x += __LDBL_DENORM_MIN__;
 	      if (ihx < 0x0360000000000000LL
-		  || (hx > 0 && (int64_t) lx < 0 && lx != 0x8000000000000001LL)
-		  || (hx < 0 && (int64_t) lx >= 0)) {
+		  || (hx > 0 && lx < 0 && lx != 0x8000000000000001LL)
+		  || (hx < 0 && lx >= 0)) {
 		u = u * u;
 		math_force_eval (u);		/* raise underflow flag */
 	      }
@@ -112,12 +120,21 @@ long double __nextafterl(long double x, long double y)
 		x = -0.0L;
 	      return x;
 	    }
-	    if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
-	      INSERT_WORDS64 (yhi, hx & (0x7ffLL<<52));
-	      u = yhi;
-	      u *= 0x1.0000000000000p-105L;
+	    /* If the high double is an exact power of two and the low
+	       double is the opposite sign, then 1ulp is one less than
+	       what we might determine from the high double.  Similarly
+	       if X is an exact power of two, and negative, because
+	       making it a little larger will result in the exponent
+	       decreasing by one and normalisation of the mantissa.   */
+	    if ((hx & 0x000fffffffffffffLL) == 0
+		&& ((lx != 0 && (hx ^ lx) < 0)
+		    || (lx == 0 && hx < 0)))
+	      ihx -= 1LL << 52;
+	    if (ihx < (106LL << 52)) { /* ulp will denormal */
+	      INSERT_WORDS64 (yhi, ihx & (0x7ffLL<<52));
+	      u = yhi * 0x1p-105;
 	    } else {
-	      INSERT_WORDS64 (yhi, (hx & (0x7ffLL<<52))-(0x069LL<<52));
+	      INSERT_WORDS64 (yhi, (ihx & (0x7ffLL<<52))-(105LL<<52));
 	      u = yhi;
 	    }
 	    return x + u;

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=b23fc92895aff0ce3d3134a91adaa253bffd187a

commit b23fc92895aff0ce3d3134a91adaa253bffd187a
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Apr 2 13:42:27 2014 +1030

    Correct prefetch hint in power7 memrchr.
    
    Typo fix.
    
    	* sysdeps/powerpc/powerpc64/power7/memrchr.S: Correct stream hint.
    
    Backport of af6b17973cbc07ac06cfb40eeab5cc2391fb489a.

diff --git a/ChangeLog b/ChangeLog
index 1768334..fe00e0c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2014-04-02  Alan Modra  <amodra@gmail.com>
 
+	* sysdeps/powerpc/powerpc64/power7/memrchr.S: Correct stream hint.
+
+2014-04-02  Alan Modra  <amodra@gmail.com>
+
 	* sysdeps/powerpc/powerpc64/start.S: Add @toc to toc symbol reference.
 
 2014-04-01  Alan Modra  <amodra@gmail.com>
diff --git a/sysdeps/powerpc/powerpc64/power7/memrchr.S b/sysdeps/powerpc/powerpc64/power7/memrchr.S
index 40e436f..0c01ca2 100644
--- a/sysdeps/powerpc/powerpc64/power7/memrchr.S
+++ b/sysdeps/powerpc/powerpc64/power7/memrchr.S
@@ -29,7 +29,7 @@ ENTRY (__memrchr)
 	mr	r10,r3
 	clrrdi	r6,r7,7
 	li	r9,3<<5
-	dcbt	r9,r6,16      /* Stream hint, decreasing addresses.  */
+	dcbt	r9,r6,8       /* Stream hint, decreasing addresses.  */
 
 	/* Replicate BYTE to doubleword.  */
 	insrdi	r4,r4,8,48

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=acd56f757b4e5ab8737b9564bd7a4ad1009acd8d

commit acd56f757b4e5ab8737b9564bd7a4ad1009acd8d
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Apr 2 13:40:21 2014 +1030

    Fix reference to toc symbol.
    
    https://sourceware.org/ml/binutils/2014-03/msg00033.html removes the
    "magic" treatment of symbols defined in a .toc section.
    
    	* sysdeps/powerpc/powerpc64/start.S: Add @toc to toc symbol reference.
    
    Backport of 483818d768ed99a5edf4114298a75ebedaee8d5c.

diff --git a/ChangeLog b/ChangeLog
index a54240d..1768334 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2014-04-02  Alan Modra  <amodra@gmail.com>
+
+	* sysdeps/powerpc/powerpc64/start.S: Add @toc to toc symbol reference.
+
 2014-04-01  Alan Modra  <amodra@gmail.com>
 
 	[BZ #16786]
diff --git a/sysdeps/powerpc/powerpc64/start.S b/sysdeps/powerpc/powerpc64/start.S
index 15e29d9..934c558 100644
--- a/sysdeps/powerpc/powerpc64/start.S
+++ b/sysdeps/powerpc/powerpc64/start.S
@@ -74,7 +74,7 @@ ENTRY(_start)
 
  /* put the address of start_addresses in r8...  **
 ** PPC64 ABI uses R13 for thread local, so we leave it alone */
-	ld	r8,.L01(r2)
+	ld	r8,.L01@toc(r2)
 
  /* and continue in libc-start, in glibc.  */
 	b	JUMPTARGET(__libc_start_main)

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=fd5100c480beef3d36c4bf74b6a23529695d036c

commit fd5100c480beef3d36c4bf74b6a23529695d036c
Author: Alan Modra <amodra@gmail.com>
Date:   Tue Apr 1 14:07:42 2014 +1030

    Fix s_copysign stack temp for PowerPC64 ELFv2
    
    	[BZ #16786]
    	* sysdeps/powerpc/powerpc64/fpu/s_copysign.S: Don't trash stack.
    
    Backport of c859b32e9d76afe8a3f20bb9528961a573c06937.

diff --git a/ChangeLog b/ChangeLog
index 5c508a9..a54240d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-04-01  Alan Modra  <amodra@gmail.com>
+
+	[BZ #16786]
+	* sysdeps/powerpc/powerpc64/fpu/s_copysign.S: Don't trash stack.
+
 2014-03-31  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
 	* sysdeps/powerpc/powerpc64/power8/fpu/s_finite.S (MFVSRD_R3_V1):
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_copysign.S b/sysdeps/powerpc/powerpc64/fpu/s_copysign.S
index 51681aa..49c793d 100644
--- a/sysdeps/powerpc/powerpc64/fpu/s_copysign.S
+++ b/sysdeps/powerpc/powerpc64/fpu/s_copysign.S
@@ -27,11 +27,11 @@ ENTRY(__copysign)
 /* double [f1] copysign (double [f1] x, double [f2] y);
    copysign(x,y) returns a value with the magnitude of x and
    with the sign bit of y.  */
-	stfd	fp2,56(r1)
+	stfd	fp2,-8(r1)
 	nop
 	nop
 	nop
-	ld	r3,56(r1)
+	ld	r3,-8(r1)
 	cmpdi   r3,0
 	blt     L(0)
 	fabs    fp1,fp1

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                  |   23 +++++++++++++
 NEWS                                       |    2 +-
 math/libm-test.inc                         |    8 ++++
 sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c |   49 +++++++++++++++++++---------
 sysdeps/powerpc/powerpc64/fpu/s_copysign.S |    4 +-
 sysdeps/powerpc/powerpc64/power7/memrchr.S |    2 +-
 sysdeps/powerpc/powerpc64/start.S          |    2 +-
 7 files changed, 69 insertions(+), 21 deletions(-)


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