From f496b28e61d0342f579bf794c71b80e9c7d0b1b5 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 21 Jun 2018 08:04:29 +0200
Subject: math: Set 387 and SSE2 rounding mode for tgamma on i386 [BZ #23253]

Previously, only the SSE2 rounding mode was set, so the assembler
implementations using 387 were not following the expecting rounding
mode.
---
 sysdeps/i386/Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'sysdeps/i386/Makefile')

diff --git a/sysdeps/i386/Makefile b/sysdeps/i386/Makefile
index 1682394e76..c0a4fe15d4 100644
--- a/sysdeps/i386/Makefile
+++ b/sysdeps/i386/Makefile
@@ -5,6 +5,14 @@ asm-CPPFLAGS += -DGAS_SYNTAX
 # The i386 `long double' is a distinct type we support.
 long-double-fcts = yes
 
+ifeq ($(subdir),math)
+# These functions change the rounding mode internally and need to
+# update both the SSE2 rounding mode and the 387 rounding mode.  See
+# the handling of MATH_SET_BOTH_ROUNDING_MODES in
+# sysdeps/i386/fpu/fenv_private.h.
+CFLAGS-e_gamma_r.c += -DMATH_SET_BOTH_ROUNDING_MODES
+endif
+
 ifeq ($(subdir),string)
 sysdep_routines += cacheinfo
 endif
-- 
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