[sim] made softfloat files C instead of C++

[riscv-isa-sim.git] / softfloat / s_subMagsF32.c

diff --git a/softfloat/s_subMagsF32.c b/softfloat/s_subMagsF32.c
new file mode 100755 (executable)
index 0000000..0c83b02
--- /dev/null
+++ b/softfloat/s_subMagsF32.c
@@ -0,0 +1,81 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t
+ softfloat_subMagsF32( uint_fast32_t uiA, uint_fast32_t uiB, bool signZ )
+{
+    int_fast16_t expA;
+    uint_fast32_t sigA;
+    int_fast16_t expB;
+    uint_fast32_t sigB;
+    int_fast16_t expDiff;
+    uint_fast32_t uiZ;
+    int_fast16_t expZ;
+    uint_fast32_t sigZ;
+    union ui32_f32 uZ;
+
+    expA = expF32UI( uiA );
+    sigA = fracF32UI( uiA );
+    expB = expF32UI( uiB );
+    sigB = fracF32UI( uiB );
+    expDiff = expA - expB;
+    sigA <<= 7;
+    sigB <<= 7;
+    if ( 0 < expDiff ) goto expABigger;
+    if ( expDiff < 0 ) goto expBBigger;
+    if ( expA == 0xFF ) {
+        if ( sigA | sigB ) goto propagateNaN;
+        softfloat_raiseFlags( softfloat_flag_invalid );
+        uiZ = defaultNaNF32UI;
+        goto uiZ;
+    }
+    if ( ! expA ) {
+        expA = 1;
+        expB = 1;
+    }
+    if ( sigB < sigA ) goto aBigger;
+    if ( sigA < sigB ) goto bBigger;
+    uiZ = packToF32UI( softfloat_roundingMode == softfloat_round_min, 0, 0 );
+    goto uiZ;
+ expBBigger:
+    if ( expB == 0xFF ) {
+        if ( sigB ) goto propagateNaN;
+        uiZ = packToF32UI( signZ ^ 1, 0xFF, 0 );
+        goto uiZ;
+    }
+    sigA += expA ? 0x40000000 : sigA;
+    sigA = softfloat_shift32RightJam( sigA, - expDiff );
+    sigB |= 0x40000000;
+ bBigger:
+    signZ ^= 1;
+    expZ = expB;
+    sigZ = sigB - sigA;
+    goto normRoundPack;
+ expABigger:
+    if ( expA == 0xFF ) {
+        if ( sigA ) goto propagateNaN;
+        uiZ = uiA;
+        goto uiZ;
+    }
+    sigB += expB ? 0x40000000 : sigB;
+    sigB = softfloat_shift32RightJam( sigB, expDiff );
+    sigA |= 0x40000000;
+ aBigger:
+    expZ = expA;
+    sigZ = sigA - sigB;
+ normRoundPack:
+    return softfloat_normRoundPackToF32( signZ, expZ - 1, sigZ );
+ propagateNaN:
+    uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+