Implement f2xm1

mehfooz09 · Nov 16, 2018 · aaa5015 · aaa5015
1 parent 4351f0c
commit aaa5015
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Showing 5 changed files with 13 additions and 2 deletions.
diff --git a/emu/decode.h b/emu/decode.h
@@ -618,6 +618,7 @@ __no_instrument DECODER_RET glue(DECODER_NAME, OP_SIZE)(DECODER_ARGS) {
                     case 0xd954: TRACE("fldlg2"); FLDC(log2); break;
                     case 0xd955: TRACE("fldln2"); FLDC(ln2); break;
                     case 0xd956: TRACE("fldz"); FLDC(zero); break;
+                    case 0xd960: TRACE("f2xm1"); F2XM1(); break;
                     case 0xd961: TRACE("fyl2x"); FYL2X(); break;
                     case 0xd970: TRACE("fprem"); FPREM(); break;
                     case 0xd974: TRACE("frndint"); FRNDINT(); break;

diff --git a/emu/fpu.c b/emu/fpu.c
@@ -2,6 +2,7 @@
 #include "emu/cpu.h"
 #include "emu/float80.h"
 #include "emu/fpu.h"
+#include <math.h>
 
 #define ST(i) cpu->fp[cpu->top + i]
 
@@ -94,6 +95,11 @@ void fpu_yl2x(struct cpu_state *cpu) {
     fpu_pop(cpu);
 }
 
+void fpu_2xm1(struct cpu_state *cpu) {
+    // an example of the ancient chinese art of chi ting
+    ST(0) = f80_from_double(pow(2, f80_to_double(ST(0))) - 1);
+}
+
 static void fpu_comparei(struct cpu_state *cpu, float80 x) {
     cpu->zf_res = cpu->pf_res = 0;
     cpu->zf = cpu->pf = cpu->cf = 0;

diff --git a/emu/fpu.h b/emu/fpu.h
@@ -47,14 +47,16 @@ void fpu_ldm80(struct cpu_state *cpu, float80 *f);
 
 void fpu_prem(struct cpu_state *cpu);
 void fpu_rndint(struct cpu_state *cpu);
+void fpu_abs(struct cpu_state *cpu);
+void fpu_chs(struct cpu_state *cpu);
 void fpu_yl2x(struct cpu_state *cpu);
+void fpu_2xm1(struct cpu_state *cpu);
+
 void fpu_com(struct cpu_state *cpu, int i);
 void fpu_comm64(struct cpu_state *cpu, double *f);
 void fpu_comi(struct cpu_state *cpu, int i);
 #define fpu_ucom fpu_com
 #define fpu_ucomi fpu_comi
-void fpu_abs(struct cpu_state *cpu);
-void fpu_chs(struct cpu_state *cpu);
 
 void fpu_add(struct cpu_state *cpu, int srci, int dsti);
 void fpu_sub(struct cpu_state *cpu, int srci, int dsti);

diff --git a/emu/interp/fpu.h b/emu/interp/fpu.h
@@ -79,6 +79,7 @@
 
 #define FRNDINT() UNDEFINED
 #define FYL2X() UNDEFINED
+#define F2XM1() UNDEFINED
 
 #define FUCOMI() \
     cpu->zf = f80_eq(ST(0), ST_i); \

diff --git a/jit/gen.c b/jit/gen.c
@@ -378,6 +378,7 @@ static inline bool gen_op(struct gen_state *state, gadget_t *gadgets, enum arg a
 #define FPREM() h(fpu_prem)
 #define FRNDINT() h(fpu_rndint)
 #define FYL2X() h(fpu_yl2x)
+#define F2XM1() h(fpu_2xm1)
 #define FSTSW(dst) if (arg_##dst == arg_reg_a) g(fstsw_ax); else UNDEFINED
 #define FSTCW(dst) if (arg_##dst == arg_reg_a) UNDEFINED; else h_write(fpu_stcw, 16)
 #define FLDCW(dst) if (arg_##dst == arg_reg_a) UNDEFINED; else h_read(fpu_ldcw, 16)