temporary undoing of renaming

[riscv-isa-sim.git] / softfloat / 8086 / s_propagateNaNF64UI.c

diff --git a/softfloat/8086/s_propagateNaNF64UI.c b/softfloat/8086/s_propagateNaNF64UI.c
new file mode 100755 (executable)
index 0000000..0ff6446
--- /dev/null
+++ b/softfloat/8086/s_propagateNaNF64UI.c
@@ -0,0 +1,55 @@
+
+/*** UPDATE COMMENTS. ***/
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+/*----------------------------------------------------------------------------
+| Takes two double-precision floating-point values `a' and `b', one of which
+| is a NaN, and returns the appropriate NaN result.  If either `a' or `b' is a
+| signaling NaN, the invalid exception is raised.
+*----------------------------------------------------------------------------*/
+
+uint_fast64_t
+ softfloat_propagateNaNF64UI( uint_fast64_t uiA, uint_fast64_t uiB )
+{
+    bool isNaNA, isSigNaNA, isNaNB, isSigNaNB;
+    uint_fast64_t uiMagA, uiMagB;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    isNaNA = isNaNF64UI( uiA );
+    isSigNaNA = softfloat_isSigNaNF64UI( uiA );
+    isNaNB = isNaNF64UI( uiB );
+    isSigNaNB = softfloat_isSigNaNF64UI( uiB );
+    /*------------------------------------------------------------------------
+    | Make NaNs non-signaling.
+    *------------------------------------------------------------------------*/
+    uiA |= UINT64_C( 0x0008000000000000 );
+    uiB |= UINT64_C( 0x0008000000000000 );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( isSigNaNA | isSigNaNB ) {
+        softfloat_raiseFlags( softfloat_flag_invalid );
+    }
+    if ( isSigNaNA ) {
+        if ( isSigNaNB ) goto returnLargerSignificand;
+        return isNaNB ? uiB : uiA;
+    } else if ( isNaNA ) {
+        if ( isSigNaNB || ! isNaNB ) return uiA;
+ returnLargerSignificand:
+        uiMagA = uiA & UINT64_C( 0x7FFFFFFFFFFFFFFF );
+        uiMagB = uiB & UINT64_C( 0x7FFFFFFFFFFFFFFF );
+        if ( uiMagA < uiMagB ) return uiB;
+        if ( uiMagB < uiMagA ) return uiA;
+        return ( uiA < uiB ) ? uiA : uiB;
+    } else {
+        return uiB;
+    }
+
+}
+