diff options
| author | Alexander Bluhm <bluhm@cvs.openbsd.org> | 2019-02-22 14:22:52 +0000 |
|---|---|---|
| committer | Alexander Bluhm <bluhm@cvs.openbsd.org> | 2019-02-22 14:22:52 +0000 |
| commit | f0a27d5e05ca4f65a2210e2f42e45b961603f013 (patch) | |
| tree | b2eb8a5ed3dda8bf09569fa6ef7ea2a86674b7e2 /regress | |
| parent | 86c618bdb9ae8d3a8e1b366c072b9df35ac87e80 (diff) | |
For ia32 use a volatile double to force 64 bit rounding. Otherwise
the i387 would use its internal 80 bit stack. This fixes getround()
on i386.
Diffstat (limited to 'regress')
| -rw-r--r-- | regress/lib/libm/msun/fenv_test.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/regress/lib/libm/msun/fenv_test.c b/regress/lib/libm/msun/fenv_test.c index 97abe77e78c..f01e5a57ac6 100644 --- a/regress/lib/libm/msun/fenv_test.c +++ b/regress/lib/libm/msun/fenv_test.c @@ -1,4 +1,4 @@ -/* $OpenBSD: fenv_test.c,v 1.2 2019/02/21 17:36:41 bluhm Exp $ */ +/* $OpenBSD: fenv_test.c,v 1.3 2019/02/22 14:22:51 bluhm Exp $ */ /*- * Copyright (c) 2004 David Schultz <das@FreeBSD.org> * All rights reserved. @@ -137,11 +137,13 @@ raiseexcept(int excepts) static int getround(void) { - volatile double d; + volatile double d, e; /* * This test works just as well with 0.0 - 0.0, except on ia64 * where 0.0 - 0.0 gives the wrong sign when rounding downwards. + * For ia32 use a volatile double to force 64 bit rounding. + * Otherwise the i387 would use its internal 80 bit stack. */ d = 1.0; d -= 1.0; @@ -149,9 +151,11 @@ getround(void) return (FE_DOWNWARD); d = 1.0; - if (d + (DBL_EPSILON * 3.0 / 4.0) == 1.0) + e = d + (DBL_EPSILON * 3.0 / 4.0); + if (e == 1.0) return (FE_TOWARDZERO); - if (d + (DBL_EPSILON * 1.0 / 4.0) > 1.0) + e = d + (DBL_EPSILON * 1.0 / 4.0); + if (e > 1.0) return (FE_UPWARD); return (FE_TONEAREST); |