diff --git a/src/lj_asm_mips.h b/src/lj_asm_mips.h
index 6163882e..299b4439 100644
--- a/src/lj_asm_mips.h
+++ b/src/lj_asm_mips.h
@@ -364,15 +364,13 @@ static void asm_callid(ASMState *as, IRIns *ir, IRCallID id)
 static void asm_callround(ASMState *as, IRIns *ir, IRCallID id)
 {
   /* The modified regs must match with the *.dasc implementation. */
-  RegSet drop = RID2RSET(RID_R1)|RID2RSET(RID_R12)|RID2RSET(RID_F2)|
-		RID2RSET(RID_F4)|RID2RSET(RID_F12)|RID2RSET(RID_F14);
-  const CCallInfo *ci = &lj_ir_callinfo[id];
-  IRRef args[2];
-  args[0] = ir->op1;
-  args[1] = ir->op2;
+  RegSet drop = RID2RSET(RID_R1)|RID2RSET(RID_R12)|RID2RSET(RID_FPRET)|
+		RID2RSET(RID_F2)|RID2RSET(RID_F4)|RID2RSET(REGARG_FIRSTFPR);
+  if (ra_hasreg(ir->r)) rset_clear(drop, ir->r);
   ra_evictset(as, drop);
   ra_destreg(as, ir, RID_FPRET);
-  asm_gencall(as, ci, args);
+  emit_call(as, (void *)lj_ir_callinfo[id].func);
+  ra_leftov(as, REGARG_FIRSTFPR, ir->op1);
 }
 
 /* -- Returns ------------------------------------------------------------- */
diff --git a/src/vm_mips.dasc b/src/vm_mips.dasc
index 23692e34..46038c36 100644
--- a/src/vm_mips.dasc
+++ b/src/vm_mips.dasc
@@ -2154,7 +2154,7 @@ static void build_subroutines(BuildCtx *ctx)
   |//-- Math helper functions ----------------------------------------------
   |//-----------------------------------------------------------------------
   |
-  |// Modifies AT, TMP0, FRET1, FRET2, f4. Keeps all others incl. FARG1, FARG2.
+  |// Modifies AT, TMP0, FRET1, FRET2, f4. Keeps all others incl. FARG1.
   |.macro vm_round, func
   |  lui TMP0, 0x4330			// Hiword of 2^52 (double).
   |  mtc1 r0, f4