temporary undoing of renaming

[riscv-isa-sim.git] / softfloat / f64_div.c

diff --git a/softfloat/f64_div.c b/softfloat/f64_div.c
new file mode 100755 (executable)
index 0000000..9bc72b3
--- /dev/null
+++ b/softfloat/f64_div.c
@@ -0,0 +1,104 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float64_t f64_div( float64_t a, float64_t b )
+{
+    union ui64_f64 uA;
+    uint_fast64_t uiA;
+    bool signA;
+    int_fast16_t expA;
+    uint_fast64_t sigA;
+    union ui64_f64 uB;
+    uint_fast64_t uiB;
+    bool signB;
+    int_fast16_t expB;
+    uint_fast64_t sigB;
+    bool signZ;
+    struct exp16_sig64 normExpSig;
+    int_fast16_t expZ;
+    uint_fast64_t sigZ;
+    struct uint128 term, rem;
+    uint_fast64_t uiZ;
+    union ui64_f64 uZ;
+
+    uA.f = a;
+    uiA = uA.ui;
+    signA = signF64UI( uiA );
+    expA = expF64UI( uiA );
+    sigA = fracF64UI( uiA );
+    uB.f = b;
+    uiB = uB.ui;
+    signB = signF64UI( uiB );
+    expB = expF64UI( uiB );
+    sigB = fracF64UI( uiB );
+    signZ = signA ^ signB;
+    if ( expA == 0x7FF ) {
+        if ( sigA ) goto propagateNaN;
+        if ( expB == 0x7FF ) {
+            if ( sigB ) goto propagateNaN;
+            goto invalid;
+        }
+        goto infinity;
+    }
+    if ( expB == 0x7FF ) {
+        if ( sigB ) goto propagateNaN;
+        goto zero;
+    }
+    if ( ! expB ) {
+        if ( ! sigB ) {
+            if ( ! ( expA | sigA ) ) goto invalid;
+            softfloat_raiseFlags( softfloat_flag_infinity );
+            goto infinity;
+        }
+        normExpSig = softfloat_normSubnormalF64Sig( sigB );
+        expB = normExpSig.exp;
+        sigB = normExpSig.sig;
+    }
+    if ( ! expA ) {
+        if ( ! sigA ) goto zero;
+        normExpSig = softfloat_normSubnormalF64Sig( sigA );
+        expA = normExpSig.exp;
+        sigA = normExpSig.sig;
+    }
+    expZ = expA - expB + 0x3FD;
+    sigA = ( sigA | UINT64_C( 0x0010000000000000 ) )<<10;
+    sigB = ( sigB | UINT64_C( 0x0010000000000000 ) )<<11;
+    if ( sigB <= ( sigA + sigA ) ) {
+        ++expZ;
+        sigA >>= 1;
+    }
+    sigZ = softfloat_estimateDiv128To64( sigA, 0, sigB );
+    if ( ( sigZ & 0x1FF ) <= 2 ) {
+        term = softfloat_mul64To128( sigB, sigZ );
+        rem = softfloat_sub128( sigA, 0, term.v64, term.v0 );
+        while ( UINT64_C( 0x8000000000000000 ) <= rem.v64 ) {
+            --sigZ;
+            rem = softfloat_add128( rem.v64, rem.v0, 0, sigB );
+        }
+        sigZ |= ( rem.v0 != 0 );
+    }
+    return softfloat_roundPackToF64( signZ, expZ, sigZ );
+ propagateNaN:
+    uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
+    goto uiZ;
+ invalid:
+    softfloat_raiseFlags( softfloat_flag_invalid );
+    uiZ = defaultNaNF64UI;
+    goto uiZ;
+ infinity:
+    uiZ = packToF64UI( signZ, 0x7FF, 0 );
+    goto uiZ;
+ zero:
+    uiZ = packToF64UI( signZ, 0, 0 );
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+