FPU update as latest MAME

[pistorm] / softfloat / fpu_constant.h

diff --git a/softfloat/fpu_constant.h b/softfloat/fpu_constant.h
new file mode 100644 (file)
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--- /dev/null
+++ b/softfloat/fpu_constant.h
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+/*============================================================================
+This source file is an extension to the SoftFloat IEC/IEEE Floating-point
+Arithmetic Package, Release 2b, written for Bochs (x86 achitecture simulator)
+floating point emulation.
+
+THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort has
+been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
+RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
+AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
+COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
+EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
+INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
+OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
+
+Derivative works are acceptable, even for commercial purposes, so long as
+(1) the source code for the derivative work includes prominent notice that
+the work is derivative, and (2) the source code includes prominent notice with
+these four paragraphs for those parts of this code that are retained.
+=============================================================================*/
+
+#ifndef _FPU_CONSTANTS_H_
+#define _FPU_CONSTANTS_H_
+
+// Pentium CPU uses only 68-bit precision M_PI approximation
+#define BETTER_THAN_PENTIUM
+
+/*============================================================================
+ * Written for Bochs (x86 achitecture simulator) by
+ *            Stanislav Shwartsman [sshwarts at sourceforge net]
+ * ==========================================================================*/
+
+//////////////////////////////
+// PI, PI/2, PI/4 constants
+//////////////////////////////
+
+#define FLOATX80_PI_EXP  (0x4000)
+
+// 128-bit PI fraction
+#ifdef BETTER_THAN_PENTIUM
+#define FLOAT_PI_HI (0xc90fdaa22168c234U)
+#define FLOAT_PI_LO (0xc4c6628b80dc1cd1U)
+#else
+#define FLOAT_PI_HI (0xc90fdaa22168c234U)
+#define FLOAT_PI_LO (0xC000000000000000U)
+#endif
+
+#define FLOATX80_PI2_EXP  (0x3FFF)
+#define FLOATX80_PI4_EXP  (0x3FFE)
+
+//////////////////////////////
+// 3PI/4 constant
+//////////////////////////////
+
+#define FLOATX80_3PI4_EXP (0x4000)
+
+// 128-bit 3PI/4 fraction
+#ifdef BETTER_THAN_PENTIUM
+#define FLOAT_3PI4_HI (0x96cbe3f9990e91a7U)
+#define FLOAT_3PI4_LO (0x9394c9e8a0a5159cU)
+#else
+#define FLOAT_3PI4_HI (0x96cbe3f9990e91a7U)
+#define FLOAT_3PI4_LO (0x9000000000000000U)
+#endif
+
+//////////////////////////////
+// 1/LN2 constant
+//////////////////////////////
+
+#define FLOAT_LN2INV_EXP  (0x3FFF)
+
+// 128-bit 1/LN2 fraction
+#ifdef BETTER_THAN_PENTIUM
+#define FLOAT_LN2INV_HI (0xb8aa3b295c17f0bbU)
+#define FLOAT_LN2INV_LO (0xbe87fed0691d3e89U)
+#else
+#define FLOAT_LN2INV_HI (0xb8aa3b295c17f0bbU)
+#define FLOAT_LN2INV_LO (0xC000000000000000U)
+#endif
+
+#endif