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info reg ecx (GDB)

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platform: Intel Xeon dual. x86-64 I use inline assembly in one C program, among which register ecx,xmm0-xmm7 are used. This C program can be corretly compiled and run. But when I "gcc -g **.c" and debug it using GDB, I found one problem as follows: %gdb a.out %gdb> b main %gdb> r %gdb> info reg ecx %gdb> invalid register 'ecx' What's the matter?

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