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authorJoseph Myers <joseph@codesourcery.com>2016-10-07 23:28:33 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-10-07 23:28:33 +0000
commitd0800ae0e7162631136a0042e87eb42c641455d9 (patch)
tree2bd2e6a01da8827ad5e2536b8c3aa4ae258a481b /math/math.h
parent12e5d361a4dcfe3579f1dd263f911ac193b0fa29 (diff)
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Make iseqsig handle excess precision.
iseqsig, like other type-generic comparison macros, should behave like a comparison operator in not removing excess range and precision from its arguments (see C11 F.10.11). This patch implements this by making definitions of iseqsig appropriately conditional on __FLT_EVAL_METHOD__ (including support for TS 18661-3 values of that macro), with a corresponding testcase (that failed for 32-bit x86 in the absence of the math.h changes) being added. (Of course the definitions may need reworking when float128 support is added, just as with other type-generic macros.) Tested for x86_64 and x86. * math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (iseqsig): Define conditional on value of [__FLT_EVAL_METHOD__]. * math/test-iseqsig-excess-precision.c: New file. * math/Makefile (tests): Add test-iseqsig-excess-precision.
Diffstat (limited to 'math/math.h')
-rw-r--r--math/math.h19
1 files changed, 17 insertions, 2 deletions
diff --git a/math/math.h b/math/math.h
index 394cefae02..880b4a018c 100644
--- a/math/math.h
+++ b/math/math.h
@@ -535,17 +535,32 @@ extern int matherr (struct exception *__exc);
/* Return X == Y but raising "invalid" and setting errno if X or Y is
a NaN. */
# ifdef __NO_LONG_DOUBLE_MATH
-# define iseqsig(x, y) \
+# if (__FLT_EVAL_METHOD__ == 1 \
+ || __FLT_EVAL_METHOD__ == 2 \
+ || __FLT_EVAL_METHOD__ > 32)
+# define iseqsig(x, y) __iseqsig ((x), (y))
+# else
+# define iseqsig(x, y) \
(sizeof ((x) + (y)) == sizeof (float) \
? __iseqsigf ((x), (y)) \
: __iseqsig ((x), (y)))
+# endif
# else
-# define iseqsig(x, y) \
+# if __FLT_EVAL_METHOD__ == 2 || __FLT_EVAL_METHOD__ > 64
+# define iseqsig(x, y) __iseqsigl ((x), (y))
+# elif __FLT_EVAL_METHOD__ == 1 || __FLT_EVAL_METHOD__ > 32
+# define iseqsig(x, y) \
+ (sizeof ((x) + (y)) <= sizeof (double) \
+ ? __iseqsig ((x), (y)) \
+ : __iseqsigl ((x), (y)))
+# else
+# define iseqsig(x, y) \
(sizeof ((x) + (y)) == sizeof (float) \
? __iseqsigf ((x), (y)) \
: sizeof ((x) + (y)) == sizeof (double) \
? __iseqsig ((x), (y)) \
: __iseqsigl ((x), (y)))
+# endif
# endif
#endif