[sim] integrated SoftFloat-3 with ISA sim; removed SoftFloat-2b

[riscv-isa-sim.git] / softfloat / f32_sqrt.cc

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