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29 lines
786 B
C
29 lines
786 B
C
#if defined __GNUC__
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bool Int_safe_MINUS_add(int x, int y, int* res) {
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return __builtin_add_overflow(x, y, res);
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}
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bool Int_safe_MINUS_sub(int x, int y, int* res) {
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return __builtin_sub_overflow(x, y, res);
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}
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bool Int_safe_MINUS_mul(int x, int y, int* res) {
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return __builtin_mul_overflow(x, y, res);
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}
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#else
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bool Int_safe_MINUS_add(int x, int y, int* res) {
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int r = x + y;
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*res = r;
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return (y > 0) && (x > (INT_MAX - y)) || (y < 0) && (x < (INT_MIN - y));
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}
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bool Int_safe_MINUS_sub(int x, int y, int* res) {
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int r = x - y;
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*res = r;
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*res = x - y;
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return (y > 0 && x < (INT_MIN + y)) || (y < 0 && x > (INT_MAX + y));
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}
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bool Int_safe_MINUS_mul(int x, int y, int* res) {
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int r = x * y;
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*res = r;
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return y == 0 || (r / y) != x;
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}
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#endif
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