Table 1: Commonly used machine modes in GCC
QImode | Quarter integer mode. Represents a single byte treated as an integer. |
HImode | Half integer mode. Represents a two-byte integer. |
SImode | Single integer mode. Represents a four-byte integer. |
SFmode | Single floating-point mode. Represents a four-byte floating number. |
DFmode | Double floating-point mode. Represents an eight-byte floating number. |