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galaxyzen avatar galaxyzen commented on May 21, 2024 
package main

//go:noinline
func add(a, b int32) (int32, bool) { return a + b, true }

func main() { add(10, 32) }

版本：go1.16.15 amd64

go1.16.15 tool compile -S -N -l main.go 后，add的Go汇编：

"".add STEXT nosplit size=31 args=0x10 locals=0x0 funcid=0x0
        0x0000 00000 (main.go:4)        TEXT    "".add(SB), NOSPLIT|ABIInternal, $0-16
        0x0000 00000 (main.go:4)        FUNCDATA        $0, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (main.go:4)        FUNCDATA        $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
        0x0000 00000 (main.go:4)        MOVL    $0, "".~r2+16(SP)
        0x0008 00008 (main.go:4)        MOVB    $0, "".~r3+20(SP)
        0x000d 00013 (main.go:4)        MOVL    "".a+8(SP), AX
        0x0011 00017 (main.go:4)        ADDL    "".b+12(SP), AX
        0x0015 00021 (main.go:4)        MOVL    AX, "".~r2+16(SP)
        0x0019 00025 (main.go:4)        MOVB    $1, "".~r3+20(SP)
        0x001e 00030 (main.go:4)        RET

[pseudo SP + 8]定位到实参a，[pseudo SP + 12]定位到实参b，所以pseudo SP的值应该是parent return address的起始位置？

from advanced-go-programming-book.

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