From 4d0fbb66d892cbbcc8989c8dd4a7ce7a440b3fd5 Mon Sep 17 00:00:00 2001
From: vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4>
Date: Thu, 6 Jun 2019 12:43:33 +0000
Subject: [src/sub1sp.c] About r13506-13509 and optimization: added a comment
 about Clang after some tests (without giving details, as in practice, this is
 more complex... but this is the general idea).

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@13510 280ebfd0-de03-0410-8827-d642c229c3f4
---
 src/sub1sp.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/sub1sp.c')

diff --git a/src/sub1sp.c b/src/sub1sp.c
index 9faf20651..51bd33b83 100644
--- a/src/sub1sp.c
+++ b/src/sub1sp.c
@@ -142,6 +142,7 @@ mpfr_sub1sp1 (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode,
              with condition flags, i.e. the test should be a no-op as the
              flag should have been obtained from the subtraction above.
              See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30315>.
+             As of version 7, Clang knows to optimize the a0 > bp[0].
              TODO: revert the test in the future, once compilers have
              improved? */
           MPFR_SET_OPPOSITE_SIGN (a, b);
-- 
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