diff --git a/tcg/ppc/tcg-target.inc.c b/tcg/ppc/tcg-target.inc.c
index 7da67086c6..c8d1e765d9 100644
--- a/tcg/ppc/tcg-target.inc.c
+++ b/tcg/ppc/tcg-target.inc.c
@@ -2610,21 +2610,24 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
 
     case INDEX_op_shl_i32:
         if (const_args[2]) {
-            tcg_out_shli32(s, args[0], args[1], args[2]);
+            /* Limit immediate shift count lest we create an illegal insn.  */
+            tcg_out_shli32(s, args[0], args[1], args[2] & 31);
         } else {
             tcg_out32(s, SLW | SAB(args[1], args[0], args[2]));
         }
         break;
     case INDEX_op_shr_i32:
         if (const_args[2]) {
-            tcg_out_shri32(s, args[0], args[1], args[2]);
+            /* Limit immediate shift count lest we create an illegal insn.  */
+            tcg_out_shri32(s, args[0], args[1], args[2] & 31);
         } else {
             tcg_out32(s, SRW | SAB(args[1], args[0], args[2]));
         }
         break;
     case INDEX_op_sar_i32:
         if (const_args[2]) {
-            tcg_out32(s, SRAWI | RS(args[1]) | RA(args[0]) | SH(args[2]));
+            /* Limit immediate shift count lest we create an illegal insn.  */
+            tcg_out32(s, SRAWI | RS(args[1]) | RA(args[0]) | SH(args[2] & 31));
         } else {
             tcg_out32(s, SRAW | SAB(args[1], args[0], args[2]));
         }
@@ -2696,14 +2699,16 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
 
     case INDEX_op_shl_i64:
         if (const_args[2]) {
-            tcg_out_shli64(s, args[0], args[1], args[2]);
+            /* Limit immediate shift count lest we create an illegal insn.  */
+            tcg_out_shli64(s, args[0], args[1], args[2] & 63);
         } else {
             tcg_out32(s, SLD | SAB(args[1], args[0], args[2]));
         }
         break;
     case INDEX_op_shr_i64:
         if (const_args[2]) {
-            tcg_out_shri64(s, args[0], args[1], args[2]);
+            /* Limit immediate shift count lest we create an illegal insn.  */
+            tcg_out_shri64(s, args[0], args[1], args[2] & 63);
         } else {
             tcg_out32(s, SRD | SAB(args[1], args[0], args[2]));
         }
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index e60b74fb82..4b8a473fad 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -3189,8 +3189,9 @@ static void do_nonatomic_op_i32(TCGv_i32 ret, TCGv addr, TCGv_i32 val,
 
     memop = tcg_canonicalize_memop(memop, 0, 0);
 
-    tcg_gen_qemu_ld_i32(t1, addr, idx, memop & ~MO_SIGN);
-    gen(t2, t1, val);
+    tcg_gen_qemu_ld_i32(t1, addr, idx, memop);
+    tcg_gen_ext_i32(t2, val, memop);
+    gen(t2, t1, t2);
     tcg_gen_qemu_st_i32(t2, addr, idx, memop);
 
     tcg_gen_ext_i32(ret, (new_val ? t2 : t1), memop);
@@ -3232,8 +3233,9 @@ static void do_nonatomic_op_i64(TCGv_i64 ret, TCGv addr, TCGv_i64 val,
 
     memop = tcg_canonicalize_memop(memop, 1, 0);
 
-    tcg_gen_qemu_ld_i64(t1, addr, idx, memop & ~MO_SIGN);
-    gen(t2, t1, val);
+    tcg_gen_qemu_ld_i64(t1, addr, idx, memop);
+    tcg_gen_ext_i64(t2, val, memop);
+    gen(t2, t1, t2);
     tcg_gen_qemu_st_i64(t2, addr, idx, memop);
 
     tcg_gen_ext_i64(ret, (new_val ? t2 : t1), memop);