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Add unsigned right shift operator

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This commit is contained in:
ISSOtm
2022-02-05 11:27:41 +01:00
committed by Eldred Habert
parent cf19879281
commit eb5af70d79
13 changed files with 60 additions and 8 deletions
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15
src/opmath.c
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@@ -86,3 +86,18 @@ int32_t op_shift_right(int32_t value, int32_t amount)
// undefined, so use a left shift manually sign-extended
return ((uint32_t)value >> amount) | amount_high_bits;
}
int32_t op_shift_right_unsigned(int32_t value, int32_t amount)
{
// Repeat the easy cases here to avoid INT_MIN funny business
if (amount == 0)
return value;
if (value == 0 || amount <= -32)
return 0;
if (amount > 31)
return (value < 0) ? -1 : 0;
if (amount < 0)
return op_shift_left(value, -amount);
return (uint32_t)value >> amount;
}