Improvements to float support in printf_fast

[fw/sdcc] / device / include / float.h

diff --git a/device/include/float.h b/device/include/float.h
index c1d3c26b2b57b779d1953e24c496bea2565db831..1c8292b4e340eda2232b246527d4b2012212f177 100644 (file)
--- a/device/include/float.h
+++ b/device/include/float.h
@@ -70,9 +70,26 @@ char __fslt (float, float);
 char __fseq (float, float);
 char __fsqt (float, float);
 
-#endif
 
+#if defined(SDCC_FLOAT_LIB) && defined(SDCC_mcs51) && !defined(SDCC_USE_XSTACK) && !defined(_SDCC_NO_ASM_LIB_FUNCS)
 
+// This adds extra code for proper round-off, in
+// an attempt to match the results from gcc.
+#define FLOAT_FULL_ACCURACY
 
+// This adds about 66 bytes to the code size and
+// significantly speeds up shift operations more
+// than 8 bits (common when subtracting numbers
+// of siginifantly different magnitude and scaling
+// to fixed point)
+#define FLOAT_SHIFT_SPEEDUP
 
+#define sign_a  psw.1
+#define sign_b  psw.5
+#define exp_a dpl
+#define exp_b dph
+#endif // using mcs51 assembly
+
+
+#endif // __SDC51_FLOAT_H