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21.4.7 PowerPC

When gdb is debugging the PowerPC architecture, it provides a set of pseudo-registers to enable inspection of 128-bit wide Decimal Floating Point numbers stored in the floating point registers. These values must be stored in two consecutive registers, always starting at an even register like f0 or f2.

The pseudo-registers go from $dl0 through $dl15, and are formed by joining the even/odd register pairs f0 and f1 for $dl0, f2 and f3 for $dl1 and so on.

For POWER7 processors, gdb provides a set of pseudo-registers, the 64-bit wide Extended Floating Point Registers (‘f32’ through ‘f63’).