void-packages/srcpkgs/glibc/patches/glibc-upstream-42.patch

From 548cc83c38a91852b1e44045ead3d20ccd5db4cf Mon Sep 17 00:00:00 2001
From: Joseph Myers <joseph@codesourcery.com>
Date: Thu, 28 Sep 2017 01:59:02 +0000
Subject: [PATCH 42] Fix nearbyint arithmetic moved before feholdexcept (bug
 22225).

In <https://sourceware.org/ml/libc-alpha/2013-05/msg00722.html> I
remarked on the possibility of arithmetic in various nearbyint
implementations being scheduled before feholdexcept calls, resulting
in spurious "inexact" exceptions.

I'm now actually observing this occurring in glibc built for ARM with
GCC 7 (in fact, both copies of the same addition/subtraction sequence
being combined and moved out before the conditionals and
feholdexcept/fesetenv pairs), resulting in test failures.

This patch makes the nearbyint implementations with this particular
feholdexcept / arithmetic / fesetenv pattern consistently use
math_opt_barrier on the function argument when first used in
arithmetic, and also consistently use math_force_eval before fesetenv
(the latter was generally already done, but the dbl-64/wordsize-64
implementation used math_opt_barrier instead, and as
math_opt_barrier's intended effect is through its output value being
used, such a use that doesn't use the return value is suspect).

Tested for x86_64 (--disable-multi-arch so more of these
implementations get used), and for ARM in a configuration where I saw
the problem scheduling.

	[BZ #22225]
	* sysdeps/ieee754/dbl-64/s_nearbyint.c (__nearbyint): Use
	math_opt_barrier on argument when doing arithmetic on it.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c (__nearbyint):
	Likewise.  Use math_force_eval not math_opt_barrier after
	arithmetic.
	* sysdeps/ieee754/flt-32/s_nearbyintf.c (__nearbyintf): Use
	math_opt_barrier on argument when doing arithmetic on it.
	* sysdeps/ieee754/ldbl-128/s_nearbyintl.c (__nearbyintl):
	Likewise.

(cherry picked from commit f124cb381116b5809de198327690ad0bd8d1478e)
---
 ChangeLog                                        | 13 +++++++++++++
 sysdeps/ieee754/dbl-64/s_nearbyint.c             |  4 ++--
 sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c |  8 ++++----
 sysdeps/ieee754/flt-32/s_nearbyintf.c            |  4 ++--
 sysdeps/ieee754/ldbl-128/s_nearbyintl.c          |  4 ++--
 5 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 382674d5a3..992722acdb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2017-09-28  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #22225]
+	* sysdeps/ieee754/dbl-64/s_nearbyint.c (__nearbyint): Use
+	math_opt_barrier on argument when doing arithmetic on it.
+	* sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c (__nearbyint):
+	Likewise.  Use math_force_eval not math_opt_barrier after
+	arithmetic.
+	* sysdeps/ieee754/flt-32/s_nearbyintf.c (__nearbyintf): Use
+	math_opt_barrier on argument when doing arithmetic on it.
+	* sysdeps/ieee754/ldbl-128/s_nearbyintl.c (__nearbyintl):
+	Likewise.
+
 2017-09-22  Gabriel F. T. Gomes  <gabriel@inconstante.eti.br>
 
 	[BZ #22146]
diff --git a/sysdeps/ieee754/dbl-64/s_nearbyint.c b/sysdeps/ieee754/dbl-64/s_nearbyint.c
index dec0c5d6ee..6e3f8316b1 100644
--- a/sysdeps/ieee754/dbl-64/s_nearbyint.c
+++ b/sysdeps/ieee754/dbl-64/s_nearbyint.c
@@ -48,7 +48,7 @@ __nearbyint (double x)
       if (j0 < 0)
 	{
 	  libc_feholdexcept (&env);
-	  w = TWO52[sx] + x;
+	  w = TWO52[sx] + math_opt_barrier (x);
 	  t = w - TWO52[sx];
 	  math_force_eval (t);
 	  libc_fesetenv (&env);
@@ -65,7 +65,7 @@ __nearbyint (double x)
 	return x;                       /* x is integral */
     }
   libc_feholdexcept (&env);
-  w = TWO52[sx] + x;
+  w = TWO52[sx] + math_opt_barrier (x);
   t = w - TWO52[sx];
   math_force_eval (t);
   libc_fesetenv (&env);
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c
index 8293819981..7d135b54e4 100644
--- a/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c
+++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c
@@ -42,9 +42,9 @@ __nearbyint(double x)
 	if(__builtin_expect(j0<52, 1)) {
 	    if(j0<0) {
 		libc_feholdexcept (&env);
-		double w = TWO52[sx]+x;
+		double w = TWO52[sx] + math_opt_barrier (x);
 		double t =  w-TWO52[sx];
-		math_opt_barrier(t);
+		math_force_eval (t);
 		libc_fesetenv (&env);
 		return __copysign (t, x);
 	    }
@@ -53,9 +53,9 @@ __nearbyint(double x)
 	    else return x;		/* x is integral */
 	}
 	libc_feholdexcept (&env);
-	double w = TWO52[sx]+x;
+	double w = TWO52[sx] + math_opt_barrier (x);
 	double t = w-TWO52[sx];
-	math_opt_barrier (t);
+	math_force_eval (t);
 	libc_fesetenv (&env);
 	return t;
 }
diff --git a/sysdeps/ieee754/flt-32/s_nearbyintf.c b/sysdeps/ieee754/flt-32/s_nearbyintf.c
index 5aebefafcf..b06df6b3c8 100644
--- a/sysdeps/ieee754/flt-32/s_nearbyintf.c
+++ b/sysdeps/ieee754/flt-32/s_nearbyintf.c
@@ -37,7 +37,7 @@ __nearbyintf(float x)
 	if(j0<23) {
 	    if(j0<0) {
 		libc_feholdexceptf (&env);
-		w = TWO23[sx]+x;
+		w = TWO23[sx] + math_opt_barrier (x);
 		t =  w-TWO23[sx];
 		math_force_eval (t);
 		libc_fesetenvf (&env);
@@ -50,7 +50,7 @@ __nearbyintf(float x)
 	    else return x;		/* x is integral */
 	}
 	libc_feholdexceptf (&env);
-	w = TWO23[sx]+x;
+	w = TWO23[sx] + math_opt_barrier (x);
 	t = w-TWO23[sx];
 	math_force_eval (t);
 	libc_fesetenvf (&env);
diff --git a/sysdeps/ieee754/ldbl-128/s_nearbyintl.c b/sysdeps/ieee754/ldbl-128/s_nearbyintl.c
index 1565a8183f..98a33d24a7 100644
--- a/sysdeps/ieee754/ldbl-128/s_nearbyintl.c
+++ b/sysdeps/ieee754/ldbl-128/s_nearbyintl.c
@@ -45,7 +45,7 @@ _Float128 __nearbyintl(_Float128 x)
 	if(j0<112) {
 	    if(j0<0) {
 		feholdexcept (&env);
-	        w = TWO112[sx]+x;
+	        w = TWO112[sx] + math_opt_barrier (x);
 	        t = w-TWO112[sx];
 		math_force_eval (t);
 	        fesetenv (&env);
@@ -58,7 +58,7 @@ _Float128 __nearbyintl(_Float128 x)
 	    else return x;		/* x is integral */
 	}
 	feholdexcept (&env);
-	w = TWO112[sx]+x;
+	w = TWO112[sx] + math_opt_barrier (x);
 	t = w-TWO112[sx];
 	math_force_eval (t);
 	fesetenv (&env);