84 lines · c
1// RUN: %clang_cc1 -Wall -Wno-unused-but-set-variable -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify %s2 3#include <limits.h>4 5#define WORD_BIT (sizeof(int) * CHAR_BIT)6 7enum {8 X = 1 << 0,9 Y = 1 << 1,10 Z = 1 << 211};12 13void test(void) {14 char c;15 16 c = 0 << 0;17 c = 0 << 1;18 c = 1 << 0;19 c = 1 << -0;20 c = 1 >> -0;21 c = 1 << -1; // expected-warning {{shift count is negative}}22 c = 1 >> -1; // expected-warning {{shift count is negative}}23 c = 1 << (unsigned)-1; // expected-warning {{shift count >= width of type}}24 // expected-warning@-1 {{implicit conversion}}25 c = 1 >> (unsigned)-1; // expected-warning {{shift count >= width of type}}26 c = 1 << c;27 c <<= 0;28 c >>= 0;29 c <<= 1;30 c >>= 1;31 c <<= -1; // expected-warning {{shift count is negative}}32 c >>= -1; // expected-warning {{shift count is negative}}33 c <<= 999999; // expected-warning {{shift count >= width of type}}34 c >>= 999999; // expected-warning {{shift count >= width of type}}35 c <<= CHAR_BIT; // expected-warning {{shift count >= width of type}}36 c >>= CHAR_BIT; // expected-warning {{shift count >= width of type}}37 c <<= CHAR_BIT+1; // expected-warning {{shift count >= width of type}}38 c >>= CHAR_BIT+1; // expected-warning {{shift count >= width of type}}39 (void)((long)c << CHAR_BIT);40 41 int i;42 i = 1 << (WORD_BIT - 2);43 i = 2 << (WORD_BIT - 1); // expected-warning {{bits to represent, but 'int' only has}}44 i = 1 << (WORD_BIT - 1); // expected-warning {{sets the sign bit of the shift expression}}45 i = -1 << (WORD_BIT - 1); // expected-warning {{shifting a negative signed value is undefined}}46 i = -1 << 0; // expected-warning {{shifting a negative signed value is undefined}}47 i = 0 << (WORD_BIT - 1);48 i = (char)1 << (WORD_BIT - 2);49 50 unsigned u;51 u = 1U << (WORD_BIT - 1);52 u = 5U << (WORD_BIT - 1);53 54 long long int lli;55 lli = INT_MIN << 2; // expected-warning {{shifting a negative signed value is undefined}}56 lli = 1LL << (sizeof(long long) * CHAR_BIT - 2);57}58 59#define a 060#define ashift 861enum { b = (a << ashift) };62 63// Don't warn for negative shifts in code that is unreachable.64void test_pr5544(void) {65 (void) (((1) > 63 && (1) < 128 ? (((unsigned long long) 1)<<((1)-64)) : (unsigned long long) 0)); // no-warning66}67 68void test_shift_too_much(char x) {69 if (0)70 (void) (x >> 80); // no-warning71 (void) (x >> 80); // expected-warning {{shift count >= width of type}}72}73 74typedef unsigned vec16 __attribute__((vector_size(16)));75typedef unsigned vec8 __attribute__((vector_size(8)));76 77void vect_shift_1(vec16 *x) { *x = *x << 4; }78 79void vect_shift_2(vec16 *x, vec16 y) { *x = *x << y; }80 81void vect_shift_3(vec16 *x, vec8 y) {82 *x = *x << y; // expected-error {{vector operands do not have the same number of elements}}83}84