79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
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// RUN: %clang_cc1 -triple x86_64-linux -verify=norounding -Wno-unknown-pragmas %s
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// RUN: %clang_cc1 -triple x86_64-linux -verify=rounding %s -frounding-math -Wno-unknown-pragmas
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// rounding-no-diagnostics
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#define fold(x) (__builtin_constant_p(x) ? (x) : (x))
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constexpr double a = 1.0 / 3.0;
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constexpr int f(int n) { return int(n * (1.0 / 3.0)); }
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using T = int[f(3)];
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using T = int[1];
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enum Enum { enum_a = f(3) };
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struct Bitfield {
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unsigned int n : 1;
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unsigned int m : f(3);
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};
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void f(Bitfield &b) {
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b.n = int(6 * (1.0 / 3.0)); // norounding-warning {{changes value from 2 to 0}}
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}
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const int k = 3 * (1.0 / 3.0);
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static_assert(k == 1, "");
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void g() {
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// FIXME: Constant-evaluating this initializer is surprising, and violates
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// the recommended practice in C++ [expr.const]p12:
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//
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// Implementations should provide consistent results of floating-point
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// evaluations, irrespective of whether the evaluation is performed during
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// translation or during program execution.
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const int k = 3 * (1.0 / 3.0);
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static_assert(k == 1, "");
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}
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int *h() {
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return new int[int(-3 * (1.0 / 3.0))]; // norounding-error {{too large}}
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}
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// nextUp(1.F) == 0x1.000002p0F
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static_assert(1.0F + 0x0.000001p0F == 0x1.0p0F, "");
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char Arr01[1 + (1.0F + 0x0.000001p0F > 1.0F)];
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static_assert(sizeof(Arr01) == 1, "");
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struct S1 {
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int : (1.0F + 0x0.000001p0F > 1.0F);
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int f;
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};
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static_assert(sizeof(S1) == sizeof(int), "");
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#pragma STDC FENV_ROUND FE_UPWARD
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static_assert(1.0F + 0x0.000001p0F == 0x1.000002p0F, "");
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char Arr01u[1 + (1.0F + 0x0.000001p0F > 1.0F)];
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static_assert(sizeof(Arr01u) == 2, "");
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struct S1u {
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int : (1.0F + 0x0.000001p0F > 1.0F);
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int f;
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};
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static_assert(sizeof(S1u) > sizeof(int), "");
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#pragma STDC FENV_ROUND FE_DOWNWARD
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static_assert(1.0F + 0x0.000001p0F == 1.0F, "");
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char Arr01d[1 + (1.0F + 0x0.000001p0F > 1.0F)];
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static_assert(sizeof(Arr01d) == 1, "");
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struct S1d {
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int : (1.0F + 0x0.000001p0F > 1.0F);
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int f;
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};
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static_assert(sizeof(S1d) == sizeof(int), "");
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