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For a function with prototype long decode2(long x; long y; long z); GCC generates the following assembly code: 1 decode2: 2 subq %rdx, %rsi 3
For a function with prototype
long decode2(long x; long y; long z);
GCC generates the following assembly code:
1 decode2:
2 subq %rdx, %rsi
3 imulp %rsi, %rdi
4 movq %rsi, %rax
5 salq $63, %rax
6 sarq $63,%rax
7 xorq %rdi,%rax
8 ret
Parameters x,y and z are passed in registers %rdi, %rsi, and %rds. The code stores the return value in register %rax. Write C code for decode2 that will have an effect equivalent to the assembly code shown
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