diff options
| author | Andrew Waterman <waterman@s144.Millennium.Berkeley.EDU> | 2010-10-15 16:17:53 -0700 |
|---|---|---|
| committer | Andrew Waterman <waterman@s144.Millennium.Berkeley.EDU> | 2010-10-15 16:17:53 -0700 |
| commit | ab928baadbfd3316988a3ad5b5d9b84693a8636f (patch) | |
| tree | b464ce729d53aeff072ed2c341b06194e9ea174b /softfloat/f32_to_f64.c | |
| parent | d3cb781e165427412b299b6034289b8458472790 (diff) | |
| download | riscv-isa-sim-ab928baadbfd3316988a3ad5b5d9b84693a8636f.zip riscv-isa-sim-ab928baadbfd3316988a3ad5b5d9b84693a8636f.tar.gz riscv-isa-sim-ab928baadbfd3316988a3ad5b5d9b84693a8636f.tar.bz2 | |
[sim] made softfloat files C instead of C++
Diffstat (limited to 'softfloat/f32_to_f64.c')
| -rwxr-xr-x | softfloat/f32_to_f64.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/softfloat/f32_to_f64.c b/softfloat/f32_to_f64.c new file mode 100755 index 0000000..9f0ae5c --- /dev/null +++ b/softfloat/f32_to_f64.c @@ -0,0 +1,47 @@ +
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float64_t f32_to_f64( float32_t a )
+{
+ union ui32_f32 uA;
+ uint_fast32_t uiA;
+ bool sign;
+ int_fast16_t exp;
+ uint_fast32_t sig;
+ uint_fast64_t uiZ;
+ struct exp16_sig32 normExpSig;
+ union ui64_f64 uZ;
+
+ uA.f = a;
+ uiA = uA.ui;
+ sign = signF32UI( uiA );
+ exp = expF32UI( uiA );
+ sig = fracF32UI( uiA );
+ if ( exp == 0xFF ) {
+ uiZ =
+ sig ? softfloat_commonNaNToF64UI(
+ softfloat_f32UIToCommonNaN( uiA ) )
+ : packToF64UI( sign, 0x7FF, 0 );
+ goto uiZ;
+ }
+ if ( ! exp ) {
+ if ( ! sig ) {
+ uiZ = packToF64UI( sign, 0, 0 );
+ goto uiZ;
+ }
+ normExpSig = softfloat_normSubnormalF32Sig( sig );
+ exp = normExpSig.exp - 1;
+ sig = normExpSig.sig;
+ }
+ uiZ = packToF64UI( sign, exp + 0x380, (uint_fast64_t) sig<<29 );
+ uiZ:
+ uZ.ui = uiZ;
+ return uZ.f;
+
+}
+
|