9c70781236
Bump CI Go versions to 1.16 and 1.17. Update build tags with `go:build` equivalents. Upgrade asmfmt tool for new `go:build` support. Updates #183
50 lines
875 B
Go
50 lines
875 B
Go
//go:build ignore
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// +build ignore
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package main
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import (
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"strconv"
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. "github.com/mmcloughlin/avo/build"
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. "github.com/mmcloughlin/avo/operand"
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. "github.com/mmcloughlin/avo/reg"
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)
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func main() {
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// n is the number of 8-bit registers to use.
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// 15 low-byte registers (excluding SP)
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// 4 high-byte registers AH,BH,CH,DH
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const n = 19
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TEXT("GP8", NOSPLIT, "func() uint8")
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Doc("GP8 returns the sum 1+2+...+" + strconv.Itoa(n) + " using " + strconv.Itoa(n) + " distinct 8-bit registers.")
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// Allocate registers and initialize.
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x := make([]Register, n)
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i := 0
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// Low byte registers.
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for ; i < 15; i++ {
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x[i] = GP8L()
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MOVB(U8(i+1), x[i])
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}
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// High byte registers.
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for ; i < n; i++ {
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x[i] = GP8H()
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MOVB(U8(i+1), x[i])
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}
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// Sum them up.
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for i := 1; i < n; i++ {
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ADDB(x[i], x[0])
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}
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// Return.
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Store(x[0], ReturnIndex(0))
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RET()
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Generate()
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}
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