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RISC-V: fmax/fmin: Handle signalling NaNs correctly.

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RISC-V's fmax(sNAN,4) returns 4 but glibc expects it to return qNAN.

	* sysdeps/riscv/rvd/s_fmax.c (__fmax): Handle sNaNs correctly.
	* sysdeps/riscv/rvd/s_fmin.c (__fmin): Likewise.
	* sysdeps/riscv/rvf/s_fmaxf.c (__fmaxf): Likewise.
	* sysdeps/riscv/rvf/s_fminf.c (__fminf): Likewise.

(cherry picked from commit fdcc625376)
This commit is contained in:
Andrew Waterman 2018-02-22 14:31:54 -05:00 committed by Fangrui Song
parent ab9c196492
commit 012483cf93
5 changed files with 43 additions and 8 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2018-02-22 Andrew Waterman <andrew@sifive.com>
* sysdeps/riscv/rvd/s_fmax.c (__fmax): Handle sNaNs correctly.
* sysdeps/riscv/rvd/s_fmin.c (__fmin): Likewise.
* sysdeps/riscv/rvf/s_fmaxf.c (__fmaxf): Likewise.
* sysdeps/riscv/rvf/s_fminf.c (__fminf): Likewise.
2018-02-22 DJ Delorie <dj@delorie.com>
* sysdeps/riscv/tls-macros.h: Do not initialize $gp.

11
sysdeps/riscv/rvd/s_fmax.c
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@ -17,12 +17,19 @@
<http://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
#include <libm-alias-double.h>
double
__fmax (double x, double y)
{
asm ("fmax.d %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
return x;
double res;
if (__glibc_unlikely ((_FCLASS (x) | _FCLASS (y)) & _FCLASS_SNAN))
return x + y;
else
asm ("fmax.d %0, %1, %2" : "=f" (res) : "f" (x), "f" (y));
return res;
}
libm_alias_double (__fmax, fmax)

11
sysdeps/riscv/rvd/s_fmin.c
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@ -17,12 +17,19 @@
<http://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
#include <libm-alias-double.h>
double
__fmin (double x, double y)
{
asm ("fmin.d %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
return x;
double res;
if (__glibc_unlikely ((_FCLASS (x) | _FCLASS (y)) & _FCLASS_SNAN))
return x + y;
else
asm ("fmin.d %0, %1, %2" : "=f" (res) : "f" (x), "f" (y));
return res;
}
libm_alias_double (__fmin, fmin)

11
sysdeps/riscv/rvf/s_fmaxf.c
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@ -17,12 +17,19 @@
<http://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
#include <libm-alias-float.h>
float
__fmaxf (float x, float y)
{
asm ("fmax.s %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
return x;
float res;
if (__glibc_unlikely ((_FCLASS (x) | _FCLASS (y)) & _FCLASS_SNAN))
return x + y;
else
asm ("fmax.s %0, %1, %2" : "=f" (res) : "f" (x), "f" (y));
return res;
}
libm_alias_float (__fmax, fmax)

11
sysdeps/riscv/rvf/s_fminf.c
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@ -17,12 +17,19 @@
<http://www.gnu.org/licenses/>. */
#include <math.h>
#include <math_private.h>
#include <libm-alias-float.h>
float
__fminf (float x, float y)
{
asm ("fmin.s %0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
return x;
float res;
if (__glibc_unlikely ((_FCLASS (x) | _FCLASS (y)) & _FCLASS_SNAN))
return x + y;
else
asm ("fmin.s %0, %1, %2" : "=f" (res) : "f" (x), "f" (y));
return res;
}
libm_alias_float (__fmin, fmin)