powerpc: Fix lgammal_r overflow warnings
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Message ID 5488D218.7050607@linux.vnet.ibm.com
State New
Headers show

Commit Message

Adhemerval Zanella Dec. 10, 2014, 11:07 p.m. UTC
On 10-12-2014 19:17, Joseph Myers wrote:
> On Wed, 10 Dec 2014, Adhemerval Zanella wrote:
>
>> +static const long double huge = HUGE_VALL;
> No, HUGE_VALL is not correct; that's infinity, which would lose the 
> overflow exceptions and rounding-mode-dependent results.  (And the 
> ChangeLog entry should name the variable whose initializer is being 
> changed.)
>

Indeed I overlooked it, below corrected patch:

--
	* sysdeps/ieee754/ldbl-128/e_lgammal_r.c: Remove overflow warnings for
	constants definition.
	(huge): Change value to LDBL_MAX.

--

Comments

Joseph Myers Dec. 11, 2014, 12:13 a.m. UTC | #1
On Wed, 10 Dec 2014, Adhemerval Zanella wrote:

> +/* BZ#16347: ldbl-128ibm uses this file as is, however the MAXLGM
> +   definition overflows for IBM long double.  This directive prevents the
> +   overflow warnings until IBM long double version is not fixed.  */

I think you mean "is fixed" not "is not fixed".  OK with that change.

Patch
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diff --git a/sysdeps/ieee754/ldbl-128/e_lgammal_r.c b/sysdeps/ieee754/ldbl-128/e_lgammal_r.c
index 1961355..2124d62 100644
--- a/sysdeps/ieee754/ldbl-128/e_lgammal_r.c
+++ b/sysdeps/ieee754/ldbl-128/e_lgammal_r.c
@@ -70,12 +70,20 @@ 

 #include <math.h>
 #include <math_private.h>
+#include <libc-internal.h>
+#include <float.h>

+/* BZ#16347: ldbl-128ibm uses this file as is, however the MAXLGM
+   definition overflows for IBM long double.  This directive prevents the
+   overflow warnings until IBM long double version is not fixed.  */
 static const long double PIL = 3.1415926535897932384626433832795028841972E0L;
+DIAG_PUSH_NEEDS_COMMENT;
+DIAG_IGNORE_NEEDS_COMMENT (4.6, "-Woverflow");
 static const long double MAXLGM = 1.0485738685148938358098967157129705071571E4928L;
+DIAG_POP_NEEDS_COMMENT;
 static const long double one = 1.0L;
 static const long double zero = 0.0L;
-static const long double huge = 1.0e4000L;
+static const long double huge = LDBL_MAX;

 /* log gamma(x) = ( x - 0.5 ) * log(x) - x + LS2PI + 1/x P(1/x^2)
    1/x <= 0.0741 (x >= 13.495...)