85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
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// RUN: %clang_cc1 -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify=expected,cxx17 -std=c++17 %s
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// RUN: %clang_cc1 -Wall -Wshift-sign-overflow -ffreestanding -fsyntax-only -verify=expected,cxx2a -std=c++2a %s
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#include <limits.h>
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#define WORD_BIT (sizeof(int) * CHAR_BIT)
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enum {
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X = 1 << 0,
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Y = 1 << 1,
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Z = 1 << 2
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};
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void test() {
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char c;
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c = 0 << 0;
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c = 0 << 1;
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c = 1 << 0;
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c = 1 << -0;
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c = 1 >> -0;
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c = 1 << -1; // expected-warning {{shift count is negative}}
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c = 1 >> -1; // expected-warning {{shift count is negative}}
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c = 1 << (unsigned)-1; // expected-warning {{shift count >= width of type}}
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// expected-warning@-1 {{implicit conversion}}
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c = 1 >> (unsigned)-1; // expected-warning {{shift count >= width of type}}
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c = 1 << c;
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c <<= 0;
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c >>= 0;
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c <<= 1;
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c >>= 1;
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c <<= -1; // expected-warning {{shift count is negative}}
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c >>= -1; // expected-warning {{shift count is negative}}
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c <<= 999999; // expected-warning {{shift count >= width of type}}
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c >>= 999999; // expected-warning {{shift count >= width of type}}
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c <<= CHAR_BIT; // expected-warning {{shift count >= width of type}}
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c >>= CHAR_BIT; // expected-warning {{shift count >= width of type}}
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c <<= CHAR_BIT+1; // expected-warning {{shift count >= width of type}}
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c >>= CHAR_BIT+1; // expected-warning {{shift count >= width of type}}
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(void)((long)c << CHAR_BIT);
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int i;
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i = 1 << (WORD_BIT - 2);
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i = 2 << (WORD_BIT - 1); // expected-warning {{bits to represent, but 'int' only has}}
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i = 1 << (WORD_BIT - 1); // expected-warning {{sets the sign bit of the shift expression}}
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i = -1 << (WORD_BIT - 1); // cxx17-warning {{shifting a negative signed value is undefined}}
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i = -1 << 0; // cxx17-warning {{shifting a negative signed value is undefined}}
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i = 0 << (WORD_BIT - 1);
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i = (char)1 << (WORD_BIT - 2);
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unsigned u;
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u = 1U << (WORD_BIT - 1);
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u = 5U << (WORD_BIT - 1);
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long long int lli;
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lli = INT_MIN << 2; // cxx17-warning {{shifting a negative signed value is undefined}} cxx2a-warning {{requires 34 bits to represent}}
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lli = 1LL << (sizeof(long long) * CHAR_BIT - 2);
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}
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#define a 0
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#define ashift 8
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enum { b = (a << ashift) };
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// Don't warn for negative shifts in code that is unreachable.
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void test_pr5544() {
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(void) (((1) > 63 && (1) < 128 ? (((unsigned long long) 1)<<((1)-64)) : (unsigned long long) 0)); // no-warning
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}
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void test_shift_too_much(char x) {
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if (0)
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(void) (x >> 80); // no-warning
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(void) (x >> 80); // expected-warning {{shift count >= width of type}}
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}
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typedef unsigned vec16 __attribute__((vector_size(16)));
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typedef unsigned vec8 __attribute__((vector_size(8)));
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void vect_shift_1(vec16 *x) { *x = *x << 4; }
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void vect_shift_2(vec16 *x, vec16 y) { *x = *x << y; }
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void vect_shift_3(vec16 *x, vec8 y) {
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*x = *x << y; // expected-error {{vector operands do not have the same number of elements}}
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}
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