[Tarantool-patches] [PATCH luajit 04/19] MIPS64: Add soft-float support to JIT compiler backend.

[Sergey Kaplun via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

From: Mike Pall <mike>

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

(cherry-picked from commit a057a07ab702e225e21848d4f918886c5b0ac06b)

The software floating point library is used on machines which do not
have hardware support for floating point [1]. This patch enables
support for such machines in JIT compiler backend for MIPS64.
This includes:
* `vm_tointg()` helper is added in <src/vm_mips64.dasm> to convert FP
  number to integer with a check for the soft-float support (called from
  JIT).
* `sfmin/max()` helpers are added in <src/vm_mips64.dasm> for min/max
  operations with a check for the soft-float support (called from JIT).
* `LJ_SOFTFP32` macro is introduced to be used for 32-bit MIPS instead
  `LJ_SOFTFP`.
* All fp-depending paths are instrumented with `LJ_SOFTFP` or
  `LJ_SOFTFP32` macro.
* The corresponding function calls in <src/lj_ircall.h> are marked as
  `XA_FP32`, `XA2_FP32`, i.e. as required extra arguments on the stack
  for soft-FP on 32-bit MIPS.

[1]: https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html

Sergey Kaplun:
* added the description for the feature

Part of tarantool/tarantool#8825
---
 src/lj_arch.h      |   4 +-
 src/lj_asm.c       |   8 +-
 src/lj_asm_mips.h  | 217 +++++++++++++++++++++++++++++++++++++--------
 src/lj_crecord.c   |   4 +-
 src/lj_emit_mips.h |   2 +
 src/lj_ffrecord.c  |   2 +-
 src/lj_ircall.h    |  43 ++++++---
 src/lj_iropt.h     |   2 +-
 src/lj_jit.h       |   4 +-
 src/lj_obj.h       |   3 +
 src/lj_opt_split.c |   2 +-
 src/lj_snap.c      |  21 +++--
 src/vm_mips64.dasc |  49 ++++++++++
 13 files changed, 286 insertions(+), 75 deletions(-)

diff --git a/src/lj_arch.h b/src/lj_arch.h
index 5276ae56..c39526ea 100644
--- a/src/lj_arch.h
+++ b/src/lj_arch.h
@@ -349,9 +349,6 @@
 #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
@@ -528,6 +525,7 @@
 #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
diff --git a/src/lj_asm.c b/src/lj_asm.c
index 0bfa44ed..15de7e33 100644
--- a/src/lj_asm.c
+++ b/src/lj_asm.c
@@ -341,7 +341,7 @@ 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
@@ -1356,7 +1356,7 @@ 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];
@@ -1703,10 +1703,10 @@ 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;
diff --git a/src/lj_asm_mips.h b/src/lj_asm_mips.h
index 0e60fc07..a26a82cd 100644
--- a/src/lj_asm_mips.h
+++ b/src/lj_asm_mips.h
@@ -290,7 +290,7 @@ static void asm_gencall(ASMState *as, const CCallInfo *ci, IRRef *args)
 	  {
 	    ra_leftov(as, gpr, ref);
 	    gpr++;
-#if LJ_64
+#if LJ_64 && !LJ_SOFTFP
 	    fpr++;
 #endif
 	  }
@@ -301,7 +301,7 @@ static void asm_gencall(ASMState *as, const CCallInfo *ci, IRRef *args)
 	  emit_spstore(as, ir, r, ofs);
 	  ofs += irt_isnum(ir->t) ? 8 : 4;
 #else
-	  emit_spstore(as, ir, r, ofs + ((LJ_BE && (LJ_SOFTFP || r < RID_MAX_GPR) && !irt_is64(ir->t)) ? 4 : 0));
+	  emit_spstore(as, ir, r, ofs + ((LJ_BE && !irt_isfp(ir->t) && !irt_is64(ir->t)) ? 4 : 0));
 	  ofs += 8;
 #endif
 	}
@@ -312,7 +312,7 @@ static void asm_gencall(ASMState *as, const CCallInfo *ci, IRRef *args)
 #endif
       if (gpr <= REGARG_LASTGPR) {
 	gpr++;
-#if LJ_64
+#if LJ_64 && !LJ_SOFTFP
 	fpr++;
 #endif
       } else {
@@ -461,12 +461,36 @@ static void asm_tobit(ASMState *as, IRIns *ir)
   emit_tg(as, MIPSI_MFC1, dest, tmp);
   emit_fgh(as, MIPSI_ADD_D, tmp, left, right);
 }
+#elif LJ_64  /* && LJ_SOFTFP */
+static void asm_tointg(ASMState *as, IRIns *ir, Reg r)
+{
+  /* The modified regs must match with the *.dasc implementation. */
+  RegSet drop = RID2RSET(REGARG_FIRSTGPR)|RID2RSET(RID_RET)|RID2RSET(RID_RET+1)|
+		RID2RSET(RID_R1)|RID2RSET(RID_R12);
+  if (ra_hasreg(ir->r)) rset_clear(drop, ir->r);
+  ra_evictset(as, drop);
+  /* Return values are in RID_RET (converted value) and RID_RET+1 (status). */
+  ra_destreg(as, ir, RID_RET);
+  asm_guard(as, MIPSI_BNE, RID_RET+1, RID_ZERO);
+  emit_call(as, (void *)lj_ir_callinfo[IRCALL_lj_vm_tointg].func, 0);
+  if (r == RID_NONE)
+    ra_leftov(as, REGARG_FIRSTGPR, ir->op1);
+  else if (r != REGARG_FIRSTGPR)
+    emit_move(as, REGARG_FIRSTGPR, r);
+}
+
+static void asm_tobit(ASMState *as, IRIns *ir)
+{
+  Reg dest = ra_dest(as, ir, RSET_GPR);
+  emit_dta(as, MIPSI_SLL, dest, dest, 0);
+  asm_callid(as, ir, IRCALL_lj_vm_tobit);
+}
 #endif
 
 static void asm_conv(ASMState *as, IRIns *ir)
 {
   IRType st = (IRType)(ir->op2 & IRCONV_SRCMASK);
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
   int stfp = (st == IRT_NUM || st == IRT_FLOAT);
 #endif
 #if LJ_64
@@ -477,12 +501,13 @@ static void asm_conv(ASMState *as, IRIns *ir)
   lua_assert(!(irt_isint64(ir->t) ||
 	       (st == IRT_I64 || st == IRT_U64))); /* Handled by SPLIT. */
 #endif
-#if LJ_32 && LJ_SOFTFP
+#if LJ_SOFTFP32
   /* FP conversions are handled by SPLIT. */
   lua_assert(!irt_isfp(ir->t) && !(st == IRT_NUM || st == IRT_FLOAT));
   /* Can't check for same types: SPLIT uses CONV int.int + BXOR for sfp NEG. */
 #else
   lua_assert(irt_type(ir->t) != st);
+#if !LJ_SOFTFP
   if (irt_isfp(ir->t)) {
     Reg dest = ra_dest(as, ir, RSET_FPR);
     if (stfp) {  /* FP to FP conversion. */
@@ -608,6 +633,42 @@ static void asm_conv(ASMState *as, IRIns *ir)
       }
     }
   } else
+#else
+  if (irt_isfp(ir->t)) {
+#if LJ_64 && LJ_HASFFI
+    if (stfp) {  /* FP to FP conversion. */
+      asm_callid(as, ir, irt_isnum(ir->t) ? IRCALL_softfp_f2d :
+					    IRCALL_softfp_d2f);
+    } else {  /* Integer to FP conversion. */
+      IRCallID cid = ((IRT_IS64 >> st) & 1) ?
+	(irt_isnum(ir->t) ?
+	 (st == IRT_I64 ? IRCALL_fp64_l2d : IRCALL_fp64_ul2d) :
+	 (st == IRT_I64 ? IRCALL_fp64_l2f : IRCALL_fp64_ul2f)) :
+	(irt_isnum(ir->t) ?
+	 (st == IRT_INT ? IRCALL_softfp_i2d : IRCALL_softfp_ui2d) :
+	 (st == IRT_INT ? IRCALL_softfp_i2f : IRCALL_softfp_ui2f));
+      asm_callid(as, ir, cid);
+    }
+#else
+    asm_callid(as, ir, IRCALL_softfp_i2d);
+#endif
+  } else if (stfp) {  /* FP to integer conversion. */
+    if (irt_isguard(ir->t)) {
+      /* Checked conversions are only supported from number to int. */
+      lua_assert(irt_isint(ir->t) && st == IRT_NUM);
+      asm_tointg(as, ir, RID_NONE);
+    } else {
+      IRCallID cid = irt_is64(ir->t) ?
+	((st == IRT_NUM) ?
+	 (irt_isi64(ir->t) ? IRCALL_fp64_d2l : IRCALL_fp64_d2ul) :
+	 (irt_isi64(ir->t) ? IRCALL_fp64_f2l : IRCALL_fp64_f2ul)) :
+	((st == IRT_NUM) ?
+	 (irt_isint(ir->t) ? IRCALL_softfp_d2i : IRCALL_softfp_d2ui) :
+	 (irt_isint(ir->t) ? IRCALL_softfp_f2i : IRCALL_softfp_f2ui));
+      asm_callid(as, ir, cid);
+    }
+  } else
+#endif
 #endif
   {
     Reg dest = ra_dest(as, ir, RSET_GPR);
@@ -665,7 +726,7 @@ static void asm_strto(ASMState *as, IRIns *ir)
   const CCallInfo *ci = &lj_ir_callinfo[IRCALL_lj_strscan_num];
   IRRef args[2];
   int32_t ofs = 0;
-#if LJ_SOFTFP
+#if LJ_SOFTFP32
   ra_evictset(as, RSET_SCRATCH);
   if (ra_used(ir)) {
     if (ra_hasspill(ir->s) && ra_hasspill((ir+1)->s) &&
@@ -806,7 +867,7 @@ static void asm_href(ASMState *as, IRIns *ir, IROp merge)
   MCLabel l_end, l_loop, l_next;
 
   rset_clear(allow, tab);
-#if LJ_32 && LJ_SOFTFP
+#if LJ_SOFTFP32
   if (!isk) {
     key = ra_alloc1(as, refkey, allow);
     rset_clear(allow, key);
@@ -826,7 +887,7 @@ static void asm_href(ASMState *as, IRIns *ir, IROp merge)
     }
   }
 #else
-  if (irt_isnum(kt)) {
+  if (!LJ_SOFTFP && irt_isnum(kt)) {
     key = ra_alloc1(as, refkey, RSET_FPR);
     tmpnum = ra_scratch(as, rset_exclude(RSET_FPR, key));
   } else if (!irt_ispri(kt)) {
@@ -882,6 +943,9 @@ static void asm_href(ASMState *as, IRIns *ir, IROp merge)
     emit_dta(as, MIPSI_DSRA32, tmp1, tmp1, 15);
     emit_tg(as, MIPSI_DMTC1, tmp1, tmpnum);
     emit_tsi(as, MIPSI_LD, tmp1, dest, (int32_t)offsetof(Node, key.u64));
+  } else if (LJ_SOFTFP && irt_isnum(kt)) {
+    emit_branch(as, MIPSI_BEQ, tmp1, key, l_end);
+    emit_tsi(as, MIPSI_LD, tmp1, dest, (int32_t)offsetof(Node, key.u64));
   } else if (irt_isaddr(kt)) {
     Reg refk = tmp2;
     if (isk) {
@@ -960,7 +1024,7 @@ static void asm_href(ASMState *as, IRIns *ir, IROp merge)
       emit_dta(as, MIPSI_ROTR, dest, tmp1, (-HASH_ROT1)&31);
       if (irt_isnum(kt)) {
 	emit_dst(as, MIPSI_ADDU, tmp1, tmp1, tmp1);
-	emit_dta(as, MIPSI_DSRA32, tmp1, tmp1, 0);
+	emit_dta(as, MIPSI_DSRA32, tmp1, LJ_SOFTFP ? key : tmp1, 0);
 	emit_dta(as, MIPSI_SLL, tmp2, LJ_SOFTFP ? key : tmp1, 0);
 #if !LJ_SOFTFP
 	emit_tg(as, MIPSI_DMFC1, tmp1, key);
@@ -1123,7 +1187,7 @@ static MIPSIns asm_fxloadins(IRIns *ir)
   case IRT_U8: return MIPSI_LBU;
   case IRT_I16: return MIPSI_LH;
   case IRT_U16: return MIPSI_LHU;
-  case IRT_NUM: lua_assert(!LJ_SOFTFP); return MIPSI_LDC1;
+  case IRT_NUM: lua_assert(!LJ_SOFTFP32); if (!LJ_SOFTFP) return MIPSI_LDC1;
   case IRT_FLOAT: if (!LJ_SOFTFP) return MIPSI_LWC1;
   default: return (LJ_64 && irt_is64(ir->t)) ? MIPSI_LD : MIPSI_LW;
   }
@@ -1134,7 +1198,7 @@ static MIPSIns asm_fxstoreins(IRIns *ir)
   switch (irt_type(ir->t)) {
   case IRT_I8: case IRT_U8: return MIPSI_SB;
   case IRT_I16: case IRT_U16: return MIPSI_SH;
-  case IRT_NUM: lua_assert(!LJ_SOFTFP); return MIPSI_SDC1;
+  case IRT_NUM: lua_assert(!LJ_SOFTFP32); if (!LJ_SOFTFP) return MIPSI_SDC1;
   case IRT_FLOAT: if (!LJ_SOFTFP) return MIPSI_SWC1;
   default: return (LJ_64 && irt_is64(ir->t)) ? MIPSI_SD : MIPSI_SW;
   }
@@ -1199,7 +1263,7 @@ static void asm_xstore_(ASMState *as, IRIns *ir, int32_t ofs)
 
 static void asm_ahuvload(ASMState *as, IRIns *ir)
 {
-  int hiop = (LJ_32 && LJ_SOFTFP && (ir+1)->o == IR_HIOP);
+  int hiop = (LJ_SOFTFP32 && (ir+1)->o == IR_HIOP);
   Reg dest = RID_NONE, type = RID_TMP, idx;
   RegSet allow = RSET_GPR;
   int32_t ofs = 0;
@@ -1212,7 +1276,7 @@ static void asm_ahuvload(ASMState *as, IRIns *ir)
     }
   }
   if (ra_used(ir)) {
-    lua_assert((LJ_SOFTFP ? 0 : irt_isnum(ir->t)) ||
+    lua_assert((LJ_SOFTFP32 ? 0 : irt_isnum(ir->t)) ||
 	       irt_isint(ir->t) || irt_isaddr(ir->t));
     dest = ra_dest(as, ir, (!LJ_SOFTFP && irt_isnum(t)) ? RSET_FPR : allow);
     rset_clear(allow, dest);
@@ -1261,10 +1325,10 @@ static void asm_ahustore(ASMState *as, IRIns *ir)
   int32_t ofs = 0;
   if (ir->r == RID_SINK)
     return;
-  if (!LJ_SOFTFP && irt_isnum(ir->t)) {
-    src = ra_alloc1(as, ir->op2, RSET_FPR);
+  if (!LJ_SOFTFP32 && irt_isnum(ir->t)) {
+    src = ra_alloc1(as, ir->op2, LJ_SOFTFP ? RSET_GPR : RSET_FPR);
     idx = asm_fuseahuref(as, ir->op1, &ofs, allow);
-    emit_hsi(as, MIPSI_SDC1, src, idx, ofs);
+    emit_hsi(as, LJ_SOFTFP ? MIPSI_SD : MIPSI_SDC1, src, idx, ofs);
   } else {
 #if LJ_32
     if (!irt_ispri(ir->t)) {
@@ -1312,7 +1376,7 @@ static void asm_sload(ASMState *as, IRIns *ir)
   IRType1 t = ir->t;
 #if LJ_32
   int32_t ofs = 8*((int32_t)ir->op1-1) + ((ir->op2 & IRSLOAD_FRAME) ? 4 : 0);
-  int hiop = (LJ_32 && LJ_SOFTFP && (ir+1)->o == IR_HIOP);
+  int hiop = (LJ_SOFTFP32 && (ir+1)->o == IR_HIOP);
   if (hiop)
     t.irt = IRT_NUM;
 #else
@@ -1320,7 +1384,7 @@ static void asm_sload(ASMState *as, IRIns *ir)
 #endif
   lua_assert(!(ir->op2 & IRSLOAD_PARENT));  /* Handled by asm_head_side(). */
   lua_assert(irt_isguard(ir->t) || !(ir->op2 & IRSLOAD_TYPECHECK));
-#if LJ_32 && LJ_SOFTFP
+#if LJ_SOFTFP32
   lua_assert(!(ir->op2 & IRSLOAD_CONVERT));  /* Handled by LJ_SOFTFP SPLIT. */
   if (hiop && ra_used(ir+1)) {
     type = ra_dest(as, ir+1, allow);
@@ -1328,29 +1392,44 @@ static void asm_sload(ASMState *as, IRIns *ir)
   }
 #else
   if ((ir->op2 & IRSLOAD_CONVERT) && irt_isguard(t) && irt_isint(t)) {
-    dest = ra_scratch(as, RSET_FPR);
+    dest = ra_scratch(as, LJ_SOFTFP ? allow : RSET_FPR);
     asm_tointg(as, ir, dest);
     t.irt = IRT_NUM;  /* Continue with a regular number type check. */
   } else
 #endif
   if (ra_used(ir)) {
-    lua_assert((LJ_SOFTFP ? 0 : irt_isnum(ir->t)) ||
+    lua_assert((LJ_SOFTFP32 ? 0 : irt_isnum(ir->t)) ||
 	       irt_isint(ir->t) || irt_isaddr(ir->t));
     dest = ra_dest(as, ir, (!LJ_SOFTFP && irt_isnum(t)) ? RSET_FPR : allow);
     rset_clear(allow, dest);
     base = ra_alloc1(as, REF_BASE, allow);
     rset_clear(allow, base);
-    if (!LJ_SOFTFP && (ir->op2 & IRSLOAD_CONVERT)) {
+    if (!LJ_SOFTFP32 && (ir->op2 & IRSLOAD_CONVERT)) {
       if (irt_isint(t)) {
-	Reg tmp = ra_scratch(as, RSET_FPR);
+	Reg tmp = ra_scratch(as, LJ_SOFTFP ? RSET_GPR : RSET_FPR);
+#if LJ_SOFTFP
+	ra_evictset(as, rset_exclude(RSET_SCRATCH, dest));
+	ra_destreg(as, ir, RID_RET);
+	emit_call(as, (void *)lj_ir_callinfo[IRCALL_softfp_d2i].func, 0);
+	if (tmp != REGARG_FIRSTGPR)
+	  emit_move(as, REGARG_FIRSTGPR, tmp);
+#else
 	emit_tg(as, MIPSI_MFC1, dest, tmp);
 	emit_fg(as, MIPSI_TRUNC_W_D, tmp, tmp);
+#endif
 	dest = tmp;
 	t.irt = IRT_NUM;  /* Check for original type. */
       } else {
 	Reg tmp = ra_scratch(as, RSET_GPR);
+#if LJ_SOFTFP
+	ra_evictset(as, rset_exclude(RSET_SCRATCH, dest));
+	ra_destreg(as, ir, RID_RET);
+	emit_call(as, (void *)lj_ir_callinfo[IRCALL_softfp_i2d].func, 0);
+	emit_dta(as, MIPSI_SLL, REGARG_FIRSTGPR, tmp, 0);
+#else
 	emit_fg(as, MIPSI_CVT_D_W, dest, dest);
 	emit_tg(as, MIPSI_MTC1, tmp, dest);
+#endif
 	dest = tmp;
 	t.irt = IRT_INT;  /* Check for original type. */
       }
@@ -1399,7 +1478,7 @@ dotypecheck:
       if (irt_isnum(t)) {
 	asm_guard(as, MIPSI_BEQ, RID_TMP, RID_ZERO);
 	emit_tsi(as, MIPSI_SLTIU, RID_TMP, RID_TMP, (int32_t)LJ_TISNUM);
-	if (ra_hasreg(dest))
+	if (!LJ_SOFTFP && ra_hasreg(dest))
 	  emit_hsi(as, MIPSI_LDC1, dest, base, ofs);
       } else {
 	asm_guard(as, MIPSI_BNE, RID_TMP,
@@ -1409,7 +1488,7 @@ dotypecheck:
     }
     emit_tsi(as, MIPSI_LD, type, base, ofs);
   } else if (ra_hasreg(dest)) {
-    if (irt_isnum(t))
+    if (!LJ_SOFTFP && irt_isnum(t))
       emit_hsi(as, MIPSI_LDC1, dest, base, ofs);
     else
       emit_tsi(as, irt_isint(t) ? MIPSI_LW : MIPSI_LD, dest, base,
@@ -1554,26 +1633,40 @@ static void asm_fpunary(ASMState *as, IRIns *ir, MIPSIns mi)
   Reg left = ra_hintalloc(as, ir->op1, dest, RSET_FPR);
   emit_fg(as, mi, dest, left);
 }
+#endif
 
+#if !LJ_SOFTFP32
 static void asm_fpmath(ASMState *as, IRIns *ir)
 {
   if (ir->op2 == IRFPM_EXP2 && asm_fpjoin_pow(as, ir))
     return;
+#if !LJ_SOFTFP
   if (ir->op2 <= IRFPM_TRUNC)
     asm_callround(as, ir, IRCALL_lj_vm_floor + ir->op2);
   else if (ir->op2 == IRFPM_SQRT)
     asm_fpunary(as, ir, MIPSI_SQRT_D);
   else
+#endif
     asm_callid(as, ir, IRCALL_lj_vm_floor + ir->op2);
 }
 #endif
 
+#if !LJ_SOFTFP
+#define asm_fpadd(as, ir)	asm_fparith(as, ir, MIPSI_ADD_D)
+#define asm_fpsub(as, ir)	asm_fparith(as, ir, MIPSI_SUB_D)
+#define asm_fpmul(as, ir)	asm_fparith(as, ir, MIPSI_MUL_D)
+#elif LJ_64  /* && LJ_SOFTFP */
+#define asm_fpadd(as, ir)	asm_callid(as, ir, IRCALL_softfp_add)
+#define asm_fpsub(as, ir)	asm_callid(as, ir, IRCALL_softfp_sub)
+#define asm_fpmul(as, ir)	asm_callid(as, ir, IRCALL_softfp_mul)
+#endif
+
 static void asm_add(ASMState *as, IRIns *ir)
 {
   IRType1 t = ir->t;
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
   if (irt_isnum(t)) {
-    asm_fparith(as, ir, MIPSI_ADD_D);
+    asm_fpadd(as, ir);
   } else
 #endif
   {
@@ -1595,9 +1688,9 @@ static void asm_add(ASMState *as, IRIns *ir)
 
 static void asm_sub(ASMState *as, IRIns *ir)
 {
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
   if (irt_isnum(ir->t)) {
-    asm_fparith(as, ir, MIPSI_SUB_D);
+    asm_fpsub(as, ir);
   } else
 #endif
   {
@@ -1611,9 +1704,9 @@ static void asm_sub(ASMState *as, IRIns *ir)
 
 static void asm_mul(ASMState *as, IRIns *ir)
 {
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
   if (irt_isnum(ir->t)) {
-    asm_fparith(as, ir, MIPSI_MUL_D);
+    asm_fpmul(as, ir);
   } else
 #endif
   {
@@ -1640,7 +1733,7 @@ static void asm_mod(ASMState *as, IRIns *ir)
     asm_callid(as, ir, IRCALL_lj_vm_modi);
 }
 
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
 static void asm_pow(ASMState *as, IRIns *ir)
 {
 #if LJ_64 && LJ_HASFFI
@@ -1660,7 +1753,11 @@ static void asm_div(ASMState *as, IRIns *ir)
 					  IRCALL_lj_carith_divu64);
   else
 #endif
+#if !LJ_SOFTFP
     asm_fparith(as, ir, MIPSI_DIV_D);
+#else
+  asm_callid(as, ir, IRCALL_softfp_div);
+#endif
 }
 #endif
 
@@ -1670,6 +1767,13 @@ static void asm_neg(ASMState *as, IRIns *ir)
   if (irt_isnum(ir->t)) {
     asm_fpunary(as, ir, MIPSI_NEG_D);
   } else
+#elif LJ_64  /* && LJ_SOFTFP */
+  if (irt_isnum(ir->t)) {
+    Reg dest = ra_dest(as, ir, RSET_GPR);
+    Reg left = ra_hintalloc(as, ir->op1, dest, RSET_GPR);
+    emit_dst(as, MIPSI_XOR, dest, left,
+	    ra_allock(as, 0x8000000000000000ll, rset_exclude(RSET_GPR, dest)));
+  } else
 #endif
   {
     Reg dest = ra_dest(as, ir, RSET_GPR);
@@ -1679,7 +1783,17 @@ static void asm_neg(ASMState *as, IRIns *ir)
   }
 }
 
+#if !LJ_SOFTFP
 #define asm_abs(as, ir)		asm_fpunary(as, ir, MIPSI_ABS_D)
+#elif LJ_64   /* && LJ_SOFTFP */
+static void asm_abs(ASMState *as, IRIns *ir)
+{
+  Reg dest = ra_dest(as, ir, RSET_GPR);
+  Reg left = ra_alloc1(as, ir->op1, RSET_GPR);
+  emit_tsml(as, MIPSI_DEXTM, dest, left, 30, 0);
+}
+#endif
+
 #define asm_atan2(as, ir)	asm_callid(as, ir, IRCALL_atan2)
 #define asm_ldexp(as, ir)	asm_callid(as, ir, IRCALL_ldexp)
 
@@ -1924,15 +2038,21 @@ static void asm_bror(ASMState *as, IRIns *ir)
   }
 }
 
-#if LJ_32 && LJ_SOFTFP
+#if LJ_SOFTFP
 static void asm_sfpmin_max(ASMState *as, IRIns *ir)
 {
   CCallInfo ci = lj_ir_callinfo[(IROp)ir->o == IR_MIN ? IRCALL_lj_vm_sfmin : IRCALL_lj_vm_sfmax];
+#if LJ_64
+  IRRef args[2];
+  args[0] = ir->op1;
+  args[1] = ir->op2;
+#else
   IRRef args[4];
   args[0^LJ_BE] = ir->op1;
   args[1^LJ_BE] = (ir+1)->op1;
   args[2^LJ_BE] = ir->op2;
   args[3^LJ_BE] = (ir+1)->op2;
+#endif
   asm_setupresult(as, ir, &ci);
   emit_call(as, (void *)ci.func, 0);
   ci.func = NULL;
@@ -1942,7 +2062,10 @@ static void asm_sfpmin_max(ASMState *as, IRIns *ir)
 
 static void asm_min_max(ASMState *as, IRIns *ir, int ismax)
 {
-  if (!LJ_SOFTFP && irt_isnum(ir->t)) {
+  if (!LJ_SOFTFP32 && irt_isnum(ir->t)) {
+#if LJ_SOFTFP
+    asm_sfpmin_max(as, ir);
+#else
     Reg dest = ra_dest(as, ir, RSET_FPR);
     Reg right, left = ra_alloc2(as, ir, RSET_FPR);
     right = (left >> 8); left &= 255;
@@ -1953,6 +2076,7 @@ static void asm_min_max(ASMState *as, IRIns *ir, int ismax)
       if (dest != right) emit_fg(as, MIPSI_MOV_D, dest, right);
     }
     emit_fgh(as, MIPSI_C_OLT_D, 0, ismax ? left : right, ismax ? right : left);
+#endif
   } else {
     Reg dest = ra_dest(as, ir, RSET_GPR);
     Reg right, left = ra_alloc2(as, ir, RSET_GPR);
@@ -1973,18 +2097,24 @@ static void asm_min_max(ASMState *as, IRIns *ir, int ismax)
 
 /* -- Comparisons --------------------------------------------------------- */
 
-#if LJ_32 && LJ_SOFTFP
+#if LJ_SOFTFP
 /* SFP comparisons. */
 static void asm_sfpcomp(ASMState *as, IRIns *ir)
 {
   const CCallInfo *ci = &lj_ir_callinfo[IRCALL_softfp_cmp];
   RegSet drop = RSET_SCRATCH;
   Reg r;
+#if LJ_64
+  IRRef args[2];
+  args[0] = ir->op1;
+  args[1] = ir->op2;
+#else
   IRRef args[4];
   args[LJ_LE ? 0 : 1] = ir->op1; args[LJ_LE ? 1 : 0] = (ir+1)->op1;
   args[LJ_LE ? 2 : 3] = ir->op2; args[LJ_LE ? 3 : 2] = (ir+1)->op2;
+#endif
 
-  for (r = REGARG_FIRSTGPR; r <= REGARG_FIRSTGPR+3; r++) {
+  for (r = REGARG_FIRSTGPR; r <= REGARG_FIRSTGPR+(LJ_64?1:3); r++) {
     if (!rset_test(as->freeset, r) &&
 	regcost_ref(as->cost[r]) == args[r-REGARG_FIRSTGPR])
       rset_clear(drop, r);
@@ -2038,11 +2168,15 @@ static void asm_comp(ASMState *as, IRIns *ir)
 {
   /* ORDER IR: LT GE LE GT  ULT UGE ULE UGT. */
   IROp op = ir->o;
-  if (!LJ_SOFTFP && irt_isnum(ir->t)) {
+  if (!LJ_SOFTFP32 && irt_isnum(ir->t)) {
+#if LJ_SOFTFP
+    asm_sfpcomp(as, ir);
+#else
     Reg right, left = ra_alloc2(as, ir, RSET_FPR);
     right = (left >> 8); left &= 255;
     asm_guard(as, (op&1) ? MIPSI_BC1T : MIPSI_BC1F, 0, 0);
     emit_fgh(as, MIPSI_C_OLT_D + ((op&3) ^ ((op>>2)&1)), 0, left, right);
+#endif
   } else {
     Reg right, left = ra_alloc1(as, ir->op1, RSET_GPR);
     if (op == IR_ABC) op = IR_UGT;
@@ -2074,9 +2208,13 @@ static void asm_equal(ASMState *as, IRIns *ir)
   Reg right, left = ra_alloc2(as, ir, (!LJ_SOFTFP && irt_isnum(ir->t)) ?
 				       RSET_FPR : RSET_GPR);
   right = (left >> 8); left &= 255;
-  if (!LJ_SOFTFP && irt_isnum(ir->t)) {
+  if (!LJ_SOFTFP32 && irt_isnum(ir->t)) {
+#if LJ_SOFTFP
+    asm_sfpcomp(as, ir);
+#else
     asm_guard(as, (ir->o & 1) ? MIPSI_BC1T : MIPSI_BC1F, 0, 0);
     emit_fgh(as, MIPSI_C_EQ_D, 0, left, right);
+#endif
   } else {
     asm_guard(as, (ir->o & 1) ? MIPSI_BEQ : MIPSI_BNE, left, right);
   }
@@ -2269,7 +2407,7 @@ static void asm_stack_restore(ASMState *as, SnapShot *snap)
     if ((sn & SNAP_NORESTORE))
       continue;
     if (irt_isnum(ir->t)) {
-#if LJ_SOFTFP
+#if LJ_SOFTFP32
       Reg tmp;
       RegSet allow = rset_exclude(RSET_GPR, RID_BASE);
       lua_assert(irref_isk(ref));  /* LJ_SOFTFP: must be a number constant. */
@@ -2278,6 +2416,9 @@ static void asm_stack_restore(ASMState *as, SnapShot *snap)
       if (rset_test(as->freeset, tmp+1)) allow = RID2RSET(tmp+1);
       tmp = ra_allock(as, (int32_t)ir_knum(ir)->u32.hi, allow);
       emit_tsi(as, MIPSI_SW, tmp, RID_BASE, ofs+(LJ_BE?0:4));
+#elif LJ_SOFTFP  /* && LJ_64 */
+      Reg src = ra_alloc1(as, ref, rset_exclude(RSET_GPR, RID_BASE));
+      emit_tsi(as, MIPSI_SD, src, RID_BASE, ofs);
 #else
       Reg src = ra_alloc1(as, ref, RSET_FPR);
       emit_hsi(as, MIPSI_SDC1, src, RID_BASE, ofs);
diff --git a/src/lj_crecord.c b/src/lj_crecord.c
index ffe995f4..804cdbf4 100644
--- a/src/lj_crecord.c
+++ b/src/lj_crecord.c
@@ -212,7 +212,7 @@ static void crec_copy_emit(jit_State *J, CRecMemList *ml, MSize mlp,
     ml[i].trval = emitir(IRT(IR_XLOAD, ml[i].tp), trsptr, 0);
     ml[i].trofs = trofs;
     i++;
-    rwin += (LJ_SOFTFP && ml[i].tp == IRT_NUM) ? 2 : 1;
+    rwin += (LJ_SOFTFP32 && ml[i].tp == IRT_NUM) ? 2 : 1;
     if (rwin >= CREC_COPY_REGWIN || i >= mlp) {  /* Flush buffered stores. */
       rwin = 0;
       for ( ; j < i; j++) {
@@ -1152,7 +1152,7 @@ static TRef crec_call_args(jit_State *J, RecordFFData *rd,
 	else
 	  tr = emitconv(tr, IRT_INT, d->size==1 ? IRT_I8 : IRT_I16,IRCONV_SEXT);
       }
-    } else if (LJ_SOFTFP && ctype_isfp(d->info) && d->size > 4) {
+    } else if (LJ_SOFTFP32 && ctype_isfp(d->info) && d->size > 4) {
       lj_needsplit(J);
     }
 #if LJ_TARGET_X86
diff --git a/src/lj_emit_mips.h b/src/lj_emit_mips.h
index 8a9ee24d..bb6593ae 100644
--- a/src/lj_emit_mips.h
+++ b/src/lj_emit_mips.h
@@ -12,6 +12,8 @@ static intptr_t get_k64val(IRIns *ir)
     return (intptr_t)ir_kgc(ir);
   } else if (ir->o == IR_KPTR || ir->o == IR_KKPTR) {
     return (intptr_t)ir_kptr(ir);
+  } else if (LJ_SOFTFP && ir->o == IR_KNUM) {
+    return (intptr_t)ir_knum(ir)->u64;
   } else {
     lua_assert(ir->o == IR_KINT || ir->o == IR_KNULL);
     return ir->i;  /* Sign-extended. */
diff --git a/src/lj_ffrecord.c b/src/lj_ffrecord.c
index 8af9da1d..0746ec64 100644
--- a/src/lj_ffrecord.c
+++ b/src/lj_ffrecord.c
@@ -986,7 +986,7 @@ static void LJ_FASTCALL recff_string_format(jit_State *J, RecordFFData *rd)
     handle_num:
       tra = lj_ir_tonum(J, tra);
       tr = lj_ir_call(J, id, tr, trsf, tra);
-      if (LJ_SOFTFP) lj_needsplit(J);
+      if (LJ_SOFTFP32) lj_needsplit(J);
       break;
     case STRFMT_STR:
       if (!tref_isstr(tra)) {
diff --git a/src/lj_ircall.h b/src/lj_ircall.h
index aa06b273..c1ac29d1 100644
--- a/src/lj_ircall.h
+++ b/src/lj_ircall.h
@@ -52,7 +52,7 @@ typedef struct CCallInfo {
 #define CCI_XARGS(ci)		(((ci)->flags >> CCI_XARGS_SHIFT) & 3)
 #define CCI_XA			(1u << CCI_XARGS_SHIFT)
 
-#if LJ_SOFTFP || (LJ_32 && LJ_HASFFI)
+#if LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)
 #define CCI_XNARGS(ci)		(CCI_NARGS((ci)) + CCI_XARGS((ci)))
 #else
 #define CCI_XNARGS(ci)		CCI_NARGS((ci))
@@ -79,13 +79,19 @@ typedef struct CCallInfo {
 #define IRCALLCOND_SOFTFP_FFI(x)	NULL
 #endif
 
-#if LJ_SOFTFP && LJ_TARGET_MIPS32
+#if LJ_SOFTFP && LJ_TARGET_MIPS
 #define IRCALLCOND_SOFTFP_MIPS(x)	x
 #else
 #define IRCALLCOND_SOFTFP_MIPS(x)	NULL
 #endif
 
-#define LJ_NEED_FP64	(LJ_TARGET_ARM || LJ_TARGET_PPC || LJ_TARGET_MIPS32)
+#if LJ_SOFTFP && LJ_TARGET_MIPS64
+#define IRCALLCOND_SOFTFP_MIPS64(x)	x
+#else
+#define IRCALLCOND_SOFTFP_MIPS64(x)	NULL
+#endif
+
+#define LJ_NEED_FP64	(LJ_TARGET_ARM || LJ_TARGET_PPC || LJ_TARGET_MIPS)
 
 #if LJ_HASFFI && (LJ_SOFTFP || LJ_NEED_FP64)
 #define IRCALLCOND_FP64_FFI(x)		x
@@ -113,6 +119,14 @@ typedef struct CCallInfo {
 #define XA2_FP		0
 #endif
 
+#if LJ_SOFTFP32
+#define XA_FP32		CCI_XA
+#define XA2_FP32	(CCI_XA+CCI_XA)
+#else
+#define XA_FP32		0
+#define XA2_FP32	0
+#endif
+
 #if LJ_32
 #define XA_64		CCI_XA
 #define XA2_64		(CCI_XA+CCI_XA)
@@ -185,20 +199,21 @@ typedef struct CCallInfo {
   _(ANY,	pow,			2,   N, NUM, XA2_FP) \
   _(ANY,	atan2,			2,   N, NUM, XA2_FP) \
   _(ANY,	ldexp,			2,   N, NUM, XA_FP) \
-  _(SOFTFP,	lj_vm_tobit,		2,   N, INT, 0) \
-  _(SOFTFP,	softfp_add,		4,   N, NUM, 0) \
-  _(SOFTFP,	softfp_sub,		4,   N, NUM, 0) \
-  _(SOFTFP,	softfp_mul,		4,   N, NUM, 0) \
-  _(SOFTFP,	softfp_div,		4,   N, NUM, 0) \
-  _(SOFTFP,	softfp_cmp,		4,   N, NIL, 0) \
+  _(SOFTFP,	lj_vm_tobit,		1,   N, INT, XA_FP32) \
+  _(SOFTFP,	softfp_add,		2,   N, NUM, XA2_FP32) \
+  _(SOFTFP,	softfp_sub,		2,   N, NUM, XA2_FP32) \
+  _(SOFTFP,	softfp_mul,		2,   N, NUM, XA2_FP32) \
+  _(SOFTFP,	softfp_div,		2,   N, NUM, XA2_FP32) \
+  _(SOFTFP,	softfp_cmp,		2,   N, NIL, XA2_FP32) \
   _(SOFTFP,	softfp_i2d,		1,   N, NUM, 0) \
-  _(SOFTFP,	softfp_d2i,		2,   N, INT, 0) \
-  _(SOFTFP_MIPS, lj_vm_sfmin,		4,   N, NUM, 0) \
-  _(SOFTFP_MIPS, lj_vm_sfmax,		4,   N, NUM, 0) \
+  _(SOFTFP,	softfp_d2i,		1,   N, INT, XA_FP32) \
+  _(SOFTFP_MIPS, lj_vm_sfmin,		2,   N, NUM, XA2_FP32) \
+  _(SOFTFP_MIPS, lj_vm_sfmax,		2,   N, NUM, XA2_FP32) \
+  _(SOFTFP_MIPS64, lj_vm_tointg,	1,   N, INT, 0) \
   _(SOFTFP_FFI,	softfp_ui2d,		1,   N, NUM, 0) \
   _(SOFTFP_FFI,	softfp_f2d,		1,   N, NUM, 0) \
-  _(SOFTFP_FFI,	softfp_d2ui,		2,   N, INT, 0) \
-  _(SOFTFP_FFI,	softfp_d2f,		2,   N, FLOAT, 0) \
+  _(SOFTFP_FFI,	softfp_d2ui,		1,   N, INT, XA_FP32) \
+  _(SOFTFP_FFI,	softfp_d2f,		1,   N, FLOAT, XA_FP32) \
   _(SOFTFP_FFI,	softfp_i2f,		1,   N, FLOAT, 0) \
   _(SOFTFP_FFI,	softfp_ui2f,		1,   N, FLOAT, 0) \
   _(SOFTFP_FFI,	softfp_f2i,		1,   N, INT, 0) \
diff --git a/src/lj_iropt.h b/src/lj_iropt.h
index 73aef0ef..a59ba3f4 100644
--- a/src/lj_iropt.h
+++ b/src/lj_iropt.h
@@ -150,7 +150,7 @@ LJ_FUNC IRType lj_opt_narrow_forl(jit_State *J, cTValue *forbase);
 /* Optimization passes. */
 LJ_FUNC void lj_opt_dce(jit_State *J);
 LJ_FUNC int lj_opt_loop(jit_State *J);
-#if LJ_SOFTFP || (LJ_32 && LJ_HASFFI)
+#if LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)
 LJ_FUNC void lj_opt_split(jit_State *J);
 #else
 #define lj_opt_split(J)		UNUSED(J)
diff --git a/src/lj_jit.h b/src/lj_jit.h
index cc8efd20..c06829ab 100644
--- a/src/lj_jit.h
+++ b/src/lj_jit.h
@@ -375,7 +375,7 @@ enum {
   ((TValue *)(((intptr_t)&J->ksimd[2*(n)] + 15) & ~(intptr_t)15))
 
 /* Set/reset flag to activate the SPLIT pass for the current trace. */
-#if LJ_SOFTFP || (LJ_32 && LJ_HASFFI)
+#if LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)
 #define lj_needsplit(J)		(J->needsplit = 1)
 #define lj_resetsplit(J)	(J->needsplit = 0)
 #else
@@ -438,7 +438,7 @@ typedef struct jit_State {
   MSize sizesnapmap;	/* Size of temp. snapshot map buffer. */
 
   PostProc postproc;	/* Required post-processing after execution. */
-#if LJ_SOFTFP || (LJ_32 && LJ_HASFFI)
+#if LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)
   uint8_t needsplit;	/* Need SPLIT pass. */
 #endif
   uint8_t retryrec;	/* Retry recording. */
diff --git a/src/lj_obj.h b/src/lj_obj.h
index 45507e0d..bf95e1eb 100644
--- a/src/lj_obj.h
+++ b/src/lj_obj.h
@@ -984,6 +984,9 @@ static LJ_AINLINE void copyTV(lua_State *L, TValue *o1, const TValue *o2)
 
 #if LJ_SOFTFP
 LJ_ASMF int32_t lj_vm_tobit(double x);
+#if LJ_TARGET_MIPS64
+LJ_ASMF int32_t lj_vm_tointg(double x);
+#endif
 #endif
 
 static LJ_AINLINE int32_t lj_num2bit(lua_Number n)
diff --git a/src/lj_opt_split.c b/src/lj_opt_split.c
index c0788106..2fc36b8d 100644
--- a/src/lj_opt_split.c
+++ b/src/lj_opt_split.c
@@ -8,7 +8,7 @@
 
 #include "lj_obj.h"
 
-#if LJ_HASJIT && (LJ_SOFTFP || (LJ_32 && LJ_HASFFI))
+#if LJ_HASJIT && (LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI))
 
 #include "lj_err.h"
 #include "lj_buf.h"
diff --git a/src/lj_snap.c b/src/lj_snap.c
index a063c316..9146cddc 100644
--- a/src/lj_snap.c
+++ b/src/lj_snap.c
@@ -93,7 +93,7 @@ static MSize snapshot_slots(jit_State *J, SnapEntry *map, BCReg nslots)
 	    (ir->op2 & (IRSLOAD_READONLY|IRSLOAD_PARENT)) != IRSLOAD_PARENT)
 	  sn |= SNAP_NORESTORE;
       }
-      if (LJ_SOFTFP && irt_isnum(ir->t))
+      if (LJ_SOFTFP32 && irt_isnum(ir->t))
 	sn |= SNAP_SOFTFPNUM;
       map[n++] = sn;
     }
@@ -379,7 +379,7 @@ IRIns *lj_snap_regspmap(GCtrace *T, SnapNo snapno, IRIns *ir)
 	  break;
 	}
       }
-    } else if (LJ_SOFTFP && ir->o == IR_HIOP) {
+    } else if (LJ_SOFTFP32 && ir->o == IR_HIOP) {
       ref++;
     } else if (ir->o == IR_PVAL) {
       ref = ir->op1 + REF_BIAS;
@@ -491,7 +491,7 @@ void lj_snap_replay(jit_State *J, GCtrace *T)
     } else {
       IRType t = irt_type(ir->t);
       uint32_t mode = IRSLOAD_INHERIT|IRSLOAD_PARENT;
-      if (LJ_SOFTFP && (sn & SNAP_SOFTFPNUM)) t = IRT_NUM;
+      if (LJ_SOFTFP32 && (sn & SNAP_SOFTFPNUM)) t = IRT_NUM;
       if (ir->o == IR_SLOAD) mode |= (ir->op2 & IRSLOAD_READONLY);
       tr = emitir_raw(IRT(IR_SLOAD, t), s, mode);
     }
@@ -525,7 +525,7 @@ void lj_snap_replay(jit_State *J, GCtrace *T)
 	    if (irs->r == RID_SINK && snap_sunk_store(T, ir, irs)) {
 	      if (snap_pref(J, T, map, nent, seen, irs->op2) == 0)
 		snap_pref(J, T, map, nent, seen, T->ir[irs->op2].op1);
-	      else if ((LJ_SOFTFP || (LJ_32 && LJ_HASFFI)) &&
+	      else if ((LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)) &&
 		       irs+1 < irlast && (irs+1)->o == IR_HIOP)
 		snap_pref(J, T, map, nent, seen, (irs+1)->op2);
 	    }
@@ -584,10 +584,10 @@ void lj_snap_replay(jit_State *J, GCtrace *T)
 		lua_assert(irc->o == IR_CONV && irc->op2 == IRCONV_NUM_INT);
 		val = snap_pref(J, T, map, nent, seen, irc->op1);
 		val = emitir(IRTN(IR_CONV), val, IRCONV_NUM_INT);
-	      } else if ((LJ_SOFTFP || (LJ_32 && LJ_HASFFI)) &&
+	      } else if ((LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)) &&
 			 irs+1 < irlast && (irs+1)->o == IR_HIOP) {
 		IRType t = IRT_I64;
-		if (LJ_SOFTFP && irt_type((irs+1)->t) == IRT_SOFTFP)
+		if (LJ_SOFTFP32 && irt_type((irs+1)->t) == IRT_SOFTFP)
 		  t = IRT_NUM;
 		lj_needsplit(J);
 		if (irref_isk(irs->op2) && irref_isk((irs+1)->op2)) {
@@ -645,7 +645,7 @@ static void snap_restoreval(jit_State *J, GCtrace *T, ExitState *ex,
     int32_t *sps = &ex->spill[regsp_spill(rs)];
     if (irt_isinteger(t)) {
       setintV(o, *sps);
-#if !LJ_SOFTFP
+#if !LJ_SOFTFP32
     } else if (irt_isnum(t)) {
       o->u64 = *(uint64_t *)sps;
 #endif
@@ -670,6 +670,9 @@ static void snap_restoreval(jit_State *J, GCtrace *T, ExitState *ex,
 #if !LJ_SOFTFP
     } else if (irt_isnum(t)) {
       setnumV(o, ex->fpr[r-RID_MIN_FPR]);
+#elif LJ_64  /* && LJ_SOFTFP */
+    } else if (irt_isnum(t)) {
+      o->u64 = ex->gpr[r-RID_MIN_GPR];
 #endif
 #if LJ_64 && !LJ_GC64
     } else if (irt_is64(t)) {
@@ -823,7 +826,7 @@ static void snap_unsink(jit_State *J, GCtrace *T, ExitState *ex,
 	  val = lj_tab_set(J->L, t, &tmp);
 	  /* NOBARRIER: The table is new (marked white). */
 	  snap_restoreval(J, T, ex, snapno, rfilt, irs->op2, val);
-	  if (LJ_SOFTFP && irs+1 < T->ir + T->nins && (irs+1)->o == IR_HIOP) {
+	  if (LJ_SOFTFP32 && irs+1 < T->ir + T->nins && (irs+1)->o == IR_HIOP) {
 	    snap_restoreval(J, T, ex, snapno, rfilt, (irs+1)->op2, &tmp);
 	    val->u32.hi = tmp.u32.lo;
 	  }
@@ -884,7 +887,7 @@ const BCIns *lj_snap_restore(jit_State *J, void *exptr)
 	continue;
       }
       snap_restoreval(J, T, ex, snapno, rfilt, ref, o);
-      if (LJ_SOFTFP && (sn & SNAP_SOFTFPNUM) && tvisint(o)) {
+      if (LJ_SOFTFP32 && (sn & SNAP_SOFTFPNUM) && tvisint(o)) {
 	TValue tmp;
 	snap_restoreval(J, T, ex, snapno, rfilt, ref+1, &tmp);
 	o->u32.hi = tmp.u32.lo;
diff --git a/src/vm_mips64.dasc b/src/vm_mips64.dasc
index 04be38f0..9839b5ac 100644
--- a/src/vm_mips64.dasc
+++ b/src/vm_mips64.dasc
@@ -1984,6 +1984,38 @@ static void build_subroutines(BuildCtx *ctx)
   |1:
   |  jr ra
   |.  move CRET1, r0
+  |
+  |// FP number to int conversion with a check for soft-float.
+  |// Modifies CARG1, CRET1, CRET2, TMP0, AT.
+  |->vm_tointg:
+  |.if JIT
+  |  dsll CRET2, CARG1, 1
+  |  beqz CRET2, >2
+  |.  li TMP0, 1076
+  |  dsrl AT, CRET2, 53
+  |  dsubu TMP0, TMP0, AT
+  |  sltiu AT, TMP0, 54
+  |  beqz AT, >1
+  |.  dextm CRET2, CRET2, 0, 20
+  |  dinsu CRET2, AT, 21, 21
+  |  slt AT, CARG1, r0
+  |  dsrlv CRET1, CRET2, TMP0
+  |  dsubu CARG1, r0, CRET1
+  |  movn CRET1, CARG1, AT
+  |  li CARG1, 64
+  |  subu TMP0, CARG1, TMP0
+  |  dsllv CRET2, CRET2, TMP0	// Integer check.
+  |  sextw AT, CRET1
+  |  xor AT, CRET1, AT		// Range check.
+  |  jr ra
+  |.  movz CRET2, AT, CRET2
+  |1:
+  |  jr ra
+  |.  li CRET2, 1
+  |2:
+  |  jr ra
+  |.  move CRET1, r0
+  |.endif
   |.endif
   |
   |.macro .ffunc_bit, name
@@ -2669,6 +2701,23 @@ static void build_subroutines(BuildCtx *ctx)
   |.  li CRET1, 0
   |.endif
   |
+  |.macro sfmin_max, name, intins
+  |->vm_sf .. name:
+  |.if JIT and not FPU
+  |  move TMP2, ra
+  |  bal ->vm_sfcmpolt
+  |.  nop
+  |  move ra, TMP2
+  |  move TMP0, CRET1
+  |  move CRET1, CARG1
+  |  jr ra
+  |.  intins CRET1, CARG2, TMP0
+  |.endif
+  |.endmacro
+  |
+  |  sfmin_max min, movz
+  |  sfmin_max max, movn
+  |
   |//-----------------------------------------------------------------------
   |//-- Miscellaneous functions --------------------------------------------
   |//-----------------------------------------------------------------------
-- 
2.41.0