Before diving into SSE programming, you need to understand the SSE control and status register for floating-point operations, called mxcsr. It is a 32-bit register, of which only the lower 16 bits are used. Here is the layout:
Bit | Mnemonic | Meaning |
|---|---|---|
0 | IE | Invalid operation error |
1 | DE | Denormal error |
2 | ZE | Divide-by-zero error |
3 | OE | Overflow error |
4 | UE | Underflow error |
5 | PE | Precision error |
6 | DAZ | Denormals are zeros |
7 | IM | Invalid operation mask |
8 | DM | Denormal operation mask |
9 | ZM | Divide-by-zero mask |
10 | OM | Overflow mask |
11 | UM | Underflow mask |
12 | PM | Precision mask |
13 | RC | Rounding control |
14 | RC | Rounding control |
15 | FZ | Flush to zero |
Bits 0 to 5 indicate when ...
