gcflags=-S shows the code of copy 3-field and 4-field structs:
// struct{a, b, c int}
0x0034 00052 (valuecopy.go:223) MOVQ $0, "".struct3_0(SB)
0x003f 00063 (valuecopy.go:223) XORPS X0, X0
0x0042 00066 (valuecopy.go:223) MOVUPS X0, "".struct3_0+8(SB)
// struct{a, b, c, d int}
0x0034 00052 (valuecopy.go:233) XORPS X0, X0
0x0037 00055 (valuecopy.go:233) MOVUPS X0, "".struct4_0(SB)
0x003e 00062 (valuecopy.go:233) MOVUPS X0, "".struct4_0+16(SB)
I don't understand the instructions.
On Sunday, May 30, 2021 at 7:04:15 AM UTC-4 Jan Mercl wrote:
> Within the benchmark loops of the linked code a sufficiently smart
> compiler can optimize the source values away completely and/or collapse all
> writes to the destination values to a single write.
>
> Have you looked at the actual code the CPU executes?
>
>>
>>
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