MIPS64: Add soft-float support to JIT compiler backend.

Contributed by Djordje Kovacevic and Stefan Pejic from RT-RK.com.
Sponsored by Cisco Systems, Inc.

src/lj_arch.h

@@ -337,9 +337,6 @@
 #define LJ_ARCH_BITS		32
 #define LJ_TARGET_MIPS32	1
 #else
-#if LJ_ABI_SOFTFP || !LJ_ARCH_HASFPU
-#define LJ_ARCH_NOJIT		1	/* NYI */
-#endif
 #define LJ_ARCH_BITS		64
 #define LJ_TARGET_MIPS64	1
 #define LJ_TARGET_GC64		1
@@ -512,6 +509,7 @@
 #define LJ_ABI_SOFTFP		0
 #endif
 #define LJ_SOFTFP		(!LJ_ARCH_HASFPU)
+#define LJ_SOFTFP32		(LJ_SOFTFP && LJ_32)
 
 #if LJ_ARCH_ENDIAN == LUAJIT_BE
 #define LJ_LE			0

src/lj_asm.c

@@ -338,7 +338,7 @@ static Reg ra_rematk(ASMState *as, IRRef ref)
   ra_modified(as, r);
   ir->r = RID_INIT;  /* Do not keep any hint. */
   RA_DBGX((as, "remat     $i $r", ir, r));
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
   if (ir->o == IR_KNUM) {
     emit_loadk64(as, r, ir);
   } else
@@ -1305,7 +1305,7 @@ static void asm_call(ASMState *as, IRIns *ir)
   asm_gencall(as, ci, args);
 }
 
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
 static void asm_fppow(ASMState *as, IRIns *ir, IRRef lref, IRRef rref)
 {
   const CCallInfo *ci = &lj_ir_callinfo[IRCALL_pow];
@@ -1652,10 +1652,10 @@ static void asm_ir(ASMState *as, IRIns *ir)
   case IR_MUL: asm_mul(as, ir); break;
   case IR_MOD: asm_mod(as, ir); break;
   case IR_NEG: asm_neg(as, ir); break;
-#if LJ_SOFTFP
+#if LJ_SOFTFP32
   case IR_DIV: case IR_POW: case IR_ABS:
   case IR_ATAN2: case IR_LDEXP: case IR_FPMATH: case IR_TOBIT:
-    lua_assert(0);  /* Unused for LJ_SOFTFP. */
+    lua_assert(0);  /* Unused for LJ_SOFTFP32. */
     break;
 #else
   case IR_DIV: asm_div(as, ir); break;