PPC: Fix range check for scaled immediates in DynASM.

dynasm/dasm_ppc.h

@@ -233,6 +233,9 @@ void dasm_put(Dst_DECL, int start, ...)
       case DASM_IMM:
 #ifdef DASM_CHECKS
 	CK((n & ((1<<((ins>>10)&31))-1)) == 0, RANGE_I);
+#endif
+	n >>= ((ins>>10)&31);
+#ifdef DASM_CHECKS
 	if (ins & 0x8000)
 	  CK(((n + (1<<(((ins>>5)&31)-1)))>>((ins>>5)&31)) == 0, RANGE_I);
 	else
@@ -360,7 +363,7 @@ int dasm_encode(Dst_DECL, void *buffer)
 	  break;
 	case DASM_LABEL_PC: break;
 	case DASM_IMM:
-	  cp[-1] |= ((n>>((ins>>10)&31)) & ((1<<((ins>>5)&31))-1)) << (ins&31);
+	  cp[-1] |= (n & ((1<<((ins>>5)&31))-1)) << (ins&31);
 	  break;
 	default: *cp++ = ins; break;
 	}