Implement finctsp

mehfooz09 · Jan 2, 2020 · ac7898b · ac7898b
1 parent dd8d3fb
commit ac7898b
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Showing 4 changed files with 10 additions and 0 deletions.
diff --git a/emu/decode.h b/emu/decode.h
@@ -714,6 +714,7 @@ __no_instrument DECODER_RET glue(DECODER_NAME, OP_SIZE)(DECODER_ARGS) {
                     case 0xd960: TRACE("f2xm1"); F2XM1(); break;
                     case 0xd961: TRACE("fyl2x"); FYL2X(); break;
                     case 0xd963: TRACE("fpatan"); FPATAN(); break;
+                    case 0xd967: TRACE("fincstp"); FINCSTP(); break;
                     case 0xd970: TRACE("fprem"); FPREM(); break;
                     case 0xd972: TRACE("fsqrt"); FSQRT(); break;
                     case 0xd974: TRACE("frndint"); FRNDINT(); break;

diff --git a/emu/fpu.c b/emu/fpu.c
@@ -22,6 +22,13 @@ void fpu_xch(struct cpu_state *cpu, int i) {
     ST(i) = tmp;
 }
 
+void fpu_incstp(struct cpu_state *cpu) {
+    // This is different from just popping the stack, it doesn't tag the stack
+    // element as free. We don't have stack tagging yet so in practice there's
+    // no difference.
+    cpu->top++;
+}
+
 // loads
 
 void fpu_ld(struct cpu_state *cpu, int i) {

diff --git a/emu/fpu.h b/emu/fpu.h
@@ -29,6 +29,7 @@ static float80 fpu_consts[] = {
 
 void fpu_pop(struct cpu_state *cpu);
 void fpu_xch(struct cpu_state *cpu, int i);
+void fpu_incstp(struct cpu_state *cpu);
 
 void fpu_st(struct cpu_state *cpu, int i);
 void fpu_ist16(struct cpu_state *cpu, int16_t *i);

diff --git a/jit/gen.c b/jit/gen.c
@@ -418,6 +418,7 @@ void helper_rdtsc(struct cpu_state *cpu);
 #define FIDIVR(val,z) h_read(fpu_idivr, z)
 #define FDIVRM(val,z) h_read(fpu_divrm, z)
 #define FPATAN() h(fpu_patan)
+#define FINCSTP() h(fpu_incstp)
 
 // vector