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authorJoseph Myers <joseph@codesourcery.com>2016-08-12 17:34:01 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-08-12 17:34:01 +0000
commit98dac0ce7641cb081f696cc80a22be7af6d62caa (patch)
treefa48db9cb2d460565bb7a742f6ac35a6958fd508 /math
parentab70f211651f50622d7f8afe3f6a68c472b1fb5a (diff)
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Fix test-fexcept when "inexact" implicitly raised.
ISO C allows feraiseexcept to raise "inexact", in addition to the requested exceptions, when requested to raise "overflow" or "underflow". Testing on ARM and PowerPC e500 (where glibc's feraiseexcept has this property) showed that the new test-fexcept test failed to allow for this; this patch fixes it, by wrapping feraiseexcept to clear FE_INEXACT if implicitly raised and not raised before the call. (It would also be possible to do this with fesetexcept, which always affects exactly the requested flags, but this patch avoids making this fix depend on the fesetexcept changes.) Tested for x86_64, x86, arm and e500. * math/test-fexcept.c (feraiseexcept_exact): New function. (test_set): Call feraiseexcept_exact instead of feraiseexcept. (test_except): Likewise.
Diffstat (limited to 'math')
-rw-r--r--math/test-fexcept.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/math/test-fexcept.c b/math/test-fexcept.c
index 5e181a1f8c..36d14c548e 100644
--- a/math/test-fexcept.c
+++ b/math/test-fexcept.c
@@ -20,6 +20,35 @@
#include <stdio.h>
#include <math-tests.h>
+/* Like feraiseexcept, but raise exactly the specified exceptions EXC,
+ without possibly raising "inexact" together with "overflow" or
+ "underflow" as permitted by ISO C. (This is not used with traps
+ enabled, so side-effects from raising and then clearing "inexact"
+ are irrelevant.) */
+
+static int
+feraiseexcept_exact (int exc)
+{
+#ifdef FE_INEXACT
+ int mask = 0;
+#ifdef FE_OVERFLOW
+ mask |= FE_OVERFLOW;
+#endif
+#ifdef FE_UNDERFLOW
+ mask |= FE_UNDERFLOW;
+#endif
+ if ((exc & FE_INEXACT) != 0
+ || (exc & mask) == 0
+ || fetestexcept (FE_INEXACT) != 0)
+ return feraiseexcept (exc);
+ int ret = feraiseexcept (exc);
+ feclearexcept (FE_INEXACT);
+ return ret;
+#else
+ return feraiseexcept (exc);
+#endif
+}
+
static int
test_set (int initial, const fexcept_t *saved, int mask, int expected)
{
@@ -28,7 +57,7 @@ test_set (int initial, const fexcept_t *saved, int mask, int expected)
printf ("Testing set: initial exceptions %x, mask %x, expected %x\n",
(unsigned int) initial, (unsigned int) mask,
(unsigned int) expected);
- int ret = feraiseexcept (initial);
+ int ret = feraiseexcept_exact (initial);
if (ret != 0)
{
puts ("feraiseexcept failed");
@@ -81,7 +110,7 @@ test_except (int exc, const char *exc_name)
return result;
}
- ret = feraiseexcept (exc);
+ ret = feraiseexcept_exact (exc);
if (ret == 0)
printf ("feraiseexcept (%s) succeeded\n", exc_name);
else