34ac353c14
Commit 759be3dad9 bumped our Go
requirement to 1.18 which allows us to drop support for old-style
`+build` tags. This change runs `go fix ./...` to remove them, and
updates some remaining code generators that produced `+build` lines.
50 lines
957 B
Markdown
50 lines
957 B
Markdown
# add
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Add two numbers with `avo`.
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The [code generator](asm.go) is as follows:
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[embedmd]:# (asm.go)
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```go
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//go:build ignore
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package main
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import . "github.com/mmcloughlin/avo/build"
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func main() {
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TEXT("Add", NOSPLIT, "func(x, y uint64) uint64")
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Doc("Add adds x and y.")
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x := Load(Param("x"), GP64())
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y := Load(Param("y"), GP64())
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ADDQ(x, y)
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Store(y, ReturnIndex(0))
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RET()
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Generate()
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}
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```
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We use a [`go:generate`](https://blog.golang.org/generate) line to produce the assembly and Go stub files together.
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[embedmd]:# (add_test.go go /.*go:generate.*/)
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```go
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//go:generate go run asm.go -out add.s -stubs stub.go
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```
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This produces [`add.s`](add.s) as follows:
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[embedmd]:# (add.s)
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```s
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// Code generated by command: go run asm.go -out add.s -stubs stub.go. DO NOT EDIT.
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#include "textflag.h"
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// func Add(x uint64, y uint64) uint64
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TEXT ·Add(SB), NOSPLIT, $0-24
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MOVQ x+0(FP), AX
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MOVQ y+8(FP), CX
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ADDQ AX, CX
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MOVQ CX, ret+16(FP)
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RET
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```
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