1 files changed, 74 insertions, 0 deletions
diff --git a/softfloat/f32_sqrt.c b/softfloat/f32_sqrt.c
new file mode 100755
index 0000000..c9eb907
--- /dev/null
+++ b/softfloat/f32_sqrt.c
@@ -0,0 +1,74 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t f32_sqrt( float32_t a )
+{
+    union ui32_f32 uA;
+    uint_fast32_t uiA;
+    bool signA;
+    int_fast16_t expA;
+    uint_fast32_t sigA, uiZ;
+    struct exp16_sig32 normExpSig;
+    int_fast16_t expZ;
+    uint_fast32_t sigZ;
+    uint_fast64_t term, rem;
+    union ui32_f32 uZ;
+
+    uA.f = a;
+    uiA = uA.ui;
+    signA = signF32UI( uiA );
+    expA = expF32UI( uiA );
+    sigA = fracF32UI( uiA );
+    if ( expA == 0xFF ) {
+        if ( sigA ) {
+            uiZ = softfloat_propagateNaNF32UI( uiA, 0 );
+            goto uiZ;
+        }
+        if ( ! signA ) return a;
+        goto invalid;
+    }
+    if ( signA ) {
+        if ( ! ( expA | sigA ) ) return a;
+        goto invalid;
+    }
+    if ( ! expA ) {
+        if ( ! sigA ) return a;
+        normExpSig = softfloat_normSubnormalF32Sig( sigA );
+        expA = normExpSig.exp;
+        sigA = normExpSig.sig;
+    }
+    expZ = ( ( expA - 0x7F )>>1 ) + 0x7E;
+    sigA = ( sigA | 0x00800000 )<<8;
+    sigZ = softfloat_estimateSqrt32( expA, sigA ) + 2;
+    if ( ( sigZ & 0x7F ) <= 5 ) {
+        if ( sigZ < 2 ) {
+            sigZ = 0x7FFFFFFF;
+            goto roundPack;
+        }
+        sigA >>= expA & 1;
+        term = (uint_fast64_t) sigZ * sigZ;
+        rem = ( (uint_fast64_t) sigA<<32 ) - term;
+        while ( UINT64_C( 0x8000000000000000 ) <= rem ) {
+            --sigZ;
+            rem += ( (uint_fast64_t) sigZ<<1 ) | 1;
+        }
+        sigZ |= ( rem != 0 );
+    }
+    sigZ = softfloat_shortShift32Right1Jam( sigZ );
+ roundPack:
+    return softfloat_roundPackToF32( 0, expZ, sigZ );
+ invalid:
+    softfloat_raiseFlags( softfloat_flag_invalid );
+    uiZ = defaultNaNF32UI;
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+