temporary undoing of renaming

[riscv-isa-sim.git] / softfloat / f32_rem.c

diff --git a/softfloat/f32_rem.c b/softfloat/f32_rem.c
new file mode 100755 (executable)
index 0000000..d29b840
--- /dev/null
+++ b/softfloat/f32_rem.c
@@ -0,0 +1,124 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t f32_rem( float32_t a, float32_t b )
+{
+    union ui32_f32 uA;
+    uint_fast32_t uiA;
+    bool signA;
+    int_fast16_t expA;
+    uint_fast32_t sigA;
+    union ui32_f32 uB;
+    uint_fast32_t uiB;
+    bool signB;
+    int_fast16_t expB;
+    uint_fast32_t sigB;
+    struct exp16_sig32 normExpSig;
+    int_fast16_t expDiff;
+    uint_fast32_t q;
+    uint_fast64_t sigA64, sigB64, q64;
+    uint_fast32_t alternateSigA;
+    uint32_t sigMean;
+    bool signZ;
+    uint_fast32_t uiZ;
+    union ui32_f32 uZ;
+
+    uA.f = a;
+    uiA = uA.ui;
+    signA = signF32UI( uiA );
+    expA = expF32UI( uiA );
+    sigA = fracF32UI( uiA );
+    uB.f = b;
+    uiB = uB.ui;
+    signB = signF32UI( uiB );
+    expB = expF32UI( uiB );
+    sigB = fracF32UI( uiB );
+    if ( expA == 0xFF ) {
+        if ( sigA || ( ( expB == 0xFF ) && sigB ) ) goto propagateNaN;
+        goto invalid;
+    }
+    if ( expB == 0xFF ) {
+        if ( sigB ) goto propagateNaN;
+        return a;
+    }
+    if ( ! expB ) {
+        if ( ! sigB ) goto invalid;
+        normExpSig = softfloat_normSubnormalF32Sig( sigB );
+        expB = normExpSig.exp;
+        sigB = normExpSig.sig;
+    }
+    if ( ! expA ) {
+        if ( ! sigA ) return a;
+        normExpSig = softfloat_normSubnormalF32Sig( sigA );
+        expA = normExpSig.exp;
+        sigA = normExpSig.sig;
+    }
+    expDiff = expA - expB;
+    sigA |= 0x00800000;
+    sigB |= 0x00800000;
+    if ( expDiff < 32 ) {
+        sigA <<= 8;
+        sigB <<= 8;
+        if ( expDiff < 0 ) {
+            if ( expDiff < -1 ) return a;
+            sigA >>= 1;
+        }
+        q = ( sigB <= sigA );
+        if ( q ) sigA -= sigB;
+        if ( 0 < expDiff ) {
+            q = ( (uint_fast64_t) sigA<<32 ) / sigB;
+            q >>= 32 - expDiff;
+            sigB >>= 2;
+            sigA = ( ( sigA>>1 )<<( expDiff - 1 ) ) - sigB * q;
+        } else {
+            sigA >>= 2;
+            sigB >>= 2;
+        }
+    } else {
+        if ( sigB <= sigA ) sigA -= sigB;
+        sigA64 = (uint_fast64_t) sigA<<40;
+        sigB64 = (uint_fast64_t) sigB<<40;
+        expDiff -= 64;
+        while ( 0 < expDiff ) {
+            q64 = softfloat_estimateDiv128To64( sigA64, 0, sigB64 );
+            q64 = ( 2 < q64 ) ? q64 - 2 : 0;
+            sigA64 = - ( ( sigB * q64 )<<38 );
+            expDiff -= 62;
+        }
+        expDiff += 64;
+        q64 = softfloat_estimateDiv128To64( sigA64, 0, sigB64 );
+        q64 = ( 2 < q64 ) ? q64 - 2 : 0;
+        q = q64>>( 64 - expDiff );
+        sigB <<= 6;
+        sigA = ( ( sigA64>>33 )<<( expDiff - 1 ) ) - sigB * q;
+    }
+    do {
+        alternateSigA = sigA;
+        ++q;
+        sigA -= sigB;
+    } while ( sigA < 0x80000000 );
+    sigMean = sigA + alternateSigA;
+    if ( ( 0x80000000 <= sigMean ) || ( ! sigMean && ( q & 1 ) ) ) {
+        sigA = alternateSigA;
+    }
+    signZ = ( 0x80000000 <= sigA );
+    if ( signZ ) sigA = - sigA;
+    return softfloat_normRoundPackToF32( signA ^ signZ, expB, sigA );
+ propagateNaN:
+    uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
+    goto uiZ;
+ invalid:
+    softfloat_raiseFlags( softfloat_flag_invalid );
+    uiZ = defaultNaNF32UI;
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+