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On 06/11/2017 03:50 PM, H.J. Lu wrote:
All internal calls within libc.so can use IFUNC on x86-64 since unlike x86, x86-64 doesn't need to reserve a register to make a PLT call.
Shouldn't this rather say, “because, unlike x86, x86-64 supports PC-relative addressing to access the GOT entry”? That's probably the root cause of the performance difference.
Thanks, Florian
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