diff --git a/src/lj_ffrecord.c b/src/lj_ffrecord.c
index 56497778..14fde4d9 100644
--- a/src/lj_ffrecord.c
+++ b/src/lj_ffrecord.c
@@ -498,7 +498,7 @@ static void LJ_FASTCALL recff_getfenv(jit_State *J, RecordFFData *rd)
 static void LJ_FASTCALL recff_math_abs(jit_State *J, RecordFFData *rd)
 {
   TRef tr = lj_ir_tonum(J, J->base[0]);
-  J->base[0] = emitir(IRTN(IR_ABS), tr, lj_ir_knum_abs(J));
+  J->base[0] = emitir(IRTN(IR_ABS), tr, lj_ir_ksimd(J, LJ_KSIMD_ABS));
   UNUSED(rd);
 }
 
diff --git a/src/lj_iropt.h b/src/lj_iropt.h
index 3e758b2e..46933671 100644
--- a/src/lj_iropt.h
+++ b/src/lj_iropt.h
@@ -77,8 +77,8 @@ static LJ_AINLINE TRef lj_ir_knum(jit_State *J, lua_Number n)
 #define lj_ir_knum_tobit(J)	lj_ir_knum_u64(J, U64x(43380000,00000000))
 
 /* Special 128 bit SIMD constants. */
-#define lj_ir_knum_abs(J)	lj_ir_k64(J, IR_KNUM, LJ_KSIMD(J, LJ_KSIMD_ABS))
-#define lj_ir_knum_neg(J)	lj_ir_k64(J, IR_KNUM, LJ_KSIMD(J, LJ_KSIMD_NEG))
+#define lj_ir_ksimd(J, idx) \
+  lj_ir_ggfload(J, IRT_NUM, (uintptr_t)LJ_KSIMD(J, idx) - (uintptr_t)J2GG(J))
 
 /* Access to constants. */
 LJ_FUNC void lj_ir_kvalue(lua_State *L, TValue *tv, const IRIns *ir);
diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c
index 95b58a1a..c102f2db 100644
--- a/src/lj_opt_fold.c
+++ b/src/lj_opt_fold.c
@@ -999,7 +999,7 @@ LJFOLDF(simplify_nummuldiv_k)
     return LEFTFOLD;
   } else if (n == -1.0) {  /* x o -1 ==> -x */
     fins->o = IR_NEG;
-    fins->op2 = (IRRef1)lj_ir_knum_neg(J);
+    fins->op2 = (IRRef1)lj_ir_ksimd(J, LJ_KSIMD_NEG);
     return RETRYFOLD;
   } else if (fins->o == IR_MUL && n == 2.0) {  /* x * 2 ==> x + x */
     fins->o = IR_ADD;
diff --git a/src/lj_opt_narrow.c b/src/lj_opt_narrow.c
index 36be66ee..ca0a0f49 100644
--- a/src/lj_opt_narrow.c
+++ b/src/lj_opt_narrow.c
@@ -555,7 +555,7 @@ TRef lj_opt_narrow_unm(jit_State *J, TRef rc, TValue *vc)
       return emitir(IRTGI(IR_SUBOV), lj_ir_kint(J, 0), rc);
     rc = emitir(IRTN(IR_CONV), rc, IRCONV_NUM_INT);
   }
-  return emitir(IRTN(IR_NEG), rc, lj_ir_knum_neg(J));
+  return emitir(IRTN(IR_NEG), rc, lj_ir_ksimd(J, LJ_KSIMD_NEG));
 }
 
 /* Narrowing of modulo operator. */