diff options
| author | Leon Alrae <leon.alrae@imgtec.com> | 2014-06-27 08:49:06 +0100 |
|---|---|---|
| committer | Leon Alrae <leon.alrae@imgtec.com> | 2014-10-14 13:28:51 +0100 |
| commit | 2d31e0607d0038b0c3450bb9624b0639e1181b1a (patch) | |
| tree | 8afa12be6ccc25159346b4d9882c434af0b99172 /fpu | |
| parent | d4ea6acdf60db1d8373543e1557ba908f5d5479b (diff) | |
| download | qemu-2d31e0607d0038b0c3450bb9624b0639e1181b1a.zip qemu-2d31e0607d0038b0c3450bb9624b0639e1181b1a.tar.gz qemu-2d31e0607d0038b0c3450bb9624b0639e1181b1a.tar.bz2 | |
softfloat: add functions corresponding to IEEE-2008 min/maxNumMag
Add abs argument to the existing softfloat minmax() function and define
new float{32,64}_{min,max}nummag functions.
minnummag(x,y) returns x if |x| < |y|,
returns y if |y| < |x|,
otherwise minnum(x,y)
maxnummag(x,y) returns x if |x| > |y|,
returns y if |y| > |x|,
otherwise maxnum(x,y)
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'fpu')
| -rw-r--r-- | fpu/softfloat.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 9274ebf..16b21eb 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -7240,13 +7240,17 @@ int float128_compare_quiet( float128 a, float128 b STATUS_PARAM ) * minnum() and maxnum correspond to the IEEE 754-2008 minNum() * and maxNum() operations. min() and max() are the typical min/max * semantics provided by many CPUs which predate that specification. + * + * minnummag() and maxnummag() functions correspond to minNumMag() + * and minNumMag() from the IEEE-754 2008. */ #define MINMAX(s) \ static inline float ## s float ## s ## _minmax(float ## s a, float ## s b, \ - int ismin, int isieee STATUS_PARAM) \ + int ismin, int isieee, \ + int ismag STATUS_PARAM) \ { \ flag aSign, bSign; \ - uint ## s ## _t av, bv; \ + uint ## s ## _t av, bv, aav, abv; \ a = float ## s ## _squash_input_denormal(a STATUS_VAR); \ b = float ## s ## _squash_input_denormal(b STATUS_VAR); \ if (float ## s ## _is_any_nan(a) || \ @@ -7266,6 +7270,17 @@ static inline float ## s float ## s ## _minmax(float ## s a, float ## s b, \ bSign = extractFloat ## s ## Sign(b); \ av = float ## s ## _val(a); \ bv = float ## s ## _val(b); \ + if (ismag) { \ + aav = float ## s ## _abs(av); \ + abv = float ## s ## _abs(bv); \ + if (aav != abv) { \ + if (ismin) { \ + return (aav < abv) ? a : b; \ + } else { \ + return (aav < abv) ? b : a; \ + } \ + } \ + } \ if (aSign != bSign) { \ if (ismin) { \ return aSign ? a : b; \ @@ -7283,22 +7298,32 @@ static inline float ## s float ## s ## _minmax(float ## s a, float ## s b, \ \ float ## s float ## s ## _min(float ## s a, float ## s b STATUS_PARAM) \ { \ - return float ## s ## _minmax(a, b, 1, 0 STATUS_VAR); \ + return float ## s ## _minmax(a, b, 1, 0, 0 STATUS_VAR); \ } \ \ float ## s float ## s ## _max(float ## s a, float ## s b STATUS_PARAM) \ { \ - return float ## s ## _minmax(a, b, 0, 0 STATUS_VAR); \ + return float ## s ## _minmax(a, b, 0, 0, 0 STATUS_VAR); \ } \ \ float ## s float ## s ## _minnum(float ## s a, float ## s b STATUS_PARAM) \ { \ - return float ## s ## _minmax(a, b, 1, 1 STATUS_VAR); \ + return float ## s ## _minmax(a, b, 1, 1, 0 STATUS_VAR); \ } \ \ float ## s float ## s ## _maxnum(float ## s a, float ## s b STATUS_PARAM) \ { \ - return float ## s ## _minmax(a, b, 0, 1 STATUS_VAR); \ + return float ## s ## _minmax(a, b, 0, 1, 0 STATUS_VAR); \ +} \ + \ +float ## s float ## s ## _minnummag(float ## s a, float ## s b STATUS_PARAM) \ +{ \ + return float ## s ## _minmax(a, b, 1, 1, 1 STATUS_VAR); \ +} \ + \ +float ## s float ## s ## _maxnummag(float ## s a, float ## s b STATUS_PARAM) \ +{ \ + return float ## s ## _minmax(a, b, 0, 1, 1 STATUS_VAR); \ } MINMAX(32) |