summaryrefslogtreecommitdiffstats
path: root/arch/arm/nwfpe/double_cpdo.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/nwfpe/double_cpdo.c')
-rw-r--r--arch/arm/nwfpe/double_cpdo.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/double_cpdo.c b/arch/arm/nwfpe/double_cpdo.c
new file mode 100644
index 0000000000..344bb7c461
--- /dev/null
+++ b/arch/arm/nwfpe/double_cpdo.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ NetWinder Floating Point Emulator
+ (c) Rebel.COM, 1998,1999
+
+ Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+*/
+
+#include "fpa11.h"
+#include "softfloat.h"
+#include "fpopcode.h"
+
+union float64_components {
+ float64 f64;
+ unsigned int i[2];
+};
+
+float64 float64_exp(float64 Fm);
+float64 float64_ln(float64 Fm);
+float64 float64_sin(float64 rFm);
+float64 float64_cos(float64 rFm);
+float64 float64_arcsin(float64 rFm);
+float64 float64_arctan(float64 rFm);
+float64 float64_log(float64 rFm);
+float64 float64_tan(float64 rFm);
+float64 float64_arccos(float64 rFm);
+float64 float64_pow(float64 rFn, float64 rFm);
+float64 float64_pol(float64 rFn, float64 rFm);
+
+static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
+{
+ return float64_sub(roundData, rFm, rFn);
+}
+
+static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
+{
+ return float64_div(roundData, rFm, rFn);
+}
+
+static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
+ [ADF_CODE >> 20] = float64_add,
+ [MUF_CODE >> 20] = float64_mul,
+ [SUF_CODE >> 20] = float64_sub,
+ [RSF_CODE >> 20] = float64_rsf,
+ [DVF_CODE >> 20] = float64_div,
+ [RDF_CODE >> 20] = float64_rdv,
+ [RMF_CODE >> 20] = float64_rem,
+
+ /* strictly, these opcodes should not be implemented */
+ [FML_CODE >> 20] = float64_mul,
+ [FDV_CODE >> 20] = float64_div,
+ [FRD_CODE >> 20] = float64_rdv,
+};
+
+static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
+{
+ return rFm;
+}
+
+static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
+{
+ union float64_components u;
+
+ u.f64 = rFm;
+#ifdef __ARMEB__
+ u.i[0] ^= 0x80000000;
+#else
+ u.i[1] ^= 0x80000000;
+#endif
+
+ return u.f64;
+}
+
+static float64 float64_abs(struct roundingData *roundData,float64 rFm)
+{
+ union float64_components u;
+
+ u.f64 = rFm;
+#ifdef __ARMEB__
+ u.i[0] &= 0x7fffffff;
+#else
+ u.i[1] &= 0x7fffffff;
+#endif
+
+ return u.f64;
+}
+
+static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
+ [MVF_CODE >> 20] = float64_mvf,
+ [MNF_CODE >> 20] = float64_mnf,
+ [ABS_CODE >> 20] = float64_abs,
+ [RND_CODE >> 20] = float64_round_to_int,
+ [URD_CODE >> 20] = float64_round_to_int,
+ [SQT_CODE >> 20] = float64_sqrt,
+ [NRM_CODE >> 20] = float64_mvf,
+};
+
+unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
+{
+ FPA11 *fpa11 = GET_FPA11();
+ float64 rFm;
+ unsigned int Fm, opc_mask_shift;
+
+ Fm = getFm(opcode);
+ if (CONSTANT_FM(opcode)) {
+ rFm = getDoubleConstant(Fm);
+ } else {
+ switch (fpa11->fType[Fm]) {
+ case typeSingle:
+ rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
+ break;
+
+ case typeDouble:
+ rFm = fpa11->fpreg[Fm].fDouble;
+ break;
+
+ default:
+ return 0;
+ }
+ }
+
+ opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
+ if (!MONADIC_INSTRUCTION(opcode)) {
+ unsigned int Fn = getFn(opcode);
+ float64 rFn;
+
+ switch (fpa11->fType[Fn]) {
+ case typeSingle:
+ rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
+ break;
+
+ case typeDouble:
+ rFn = fpa11->fpreg[Fn].fDouble;
+ break;
+
+ default:
+ return 0;
+ }
+
+ if (dyadic_double[opc_mask_shift]) {
+ rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
+ } else {
+ return 0;
+ }
+ } else {
+ if (monadic_double[opc_mask_shift]) {
+ rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
+ } else {
+ return 0;
+ }
+ }
+
+ return 1;
+}