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cmd/compile: get rid of special case in scheduler for entry block

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It isn't needed.

Fixes #61356

Change-Id: Ib466a3eac90c3ea57888cf40c294513033fc6118
Reviewed-on: https://go-review.googlesource.com/c/go/+/509856
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
This commit is contained in:
Keith Randall 2023-07-14 09:45:31 -07:00
parent c94f39a80e
commit 505e50b1e3
2 changed files with 55 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/cmd/compile/internal/ssa/schedule.go
View File

@ -7,7 +7,6 @@ package ssa
import ( import (
"cmd/compile/internal/base" "cmd/compile/internal/base"
"cmd/compile/internal/types" "cmd/compile/internal/types"
"cmd/internal/src"
"container/heap" "container/heap"
"sort" "sort"
) )
@ -65,10 +64,6 @@ func (h ValHeap) Less(i, j int) bool {
} }
if x.Pos != y.Pos { // Favor in-order line stepping if x.Pos != y.Pos { // Favor in-order line stepping
if x.Block == x.Block.Func.Entry && x.Pos.IsStmt() != y.Pos.IsStmt() {
// In the entry block, put statement-marked instructions earlier.
return x.Pos.IsStmt() == src.PosIsStmt && y.Pos.IsStmt() != src.PosIsStmt
}
return x.Pos.Before(y.Pos) return x.Pos.Before(y.Pos)
} }
if x.Op != OpPhi { if x.Op != OpPhi {

55
test/codegen/issue61356.go Normal file
View File

@ -0,0 +1,55 @@
// asmcheck
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Make sure this code doesn't generate spill/restore.
package codegen
func pack20(in *[20]uint64) uint64 {
var out uint64
out |= 4
// amd64:-`.*SP.*`
out |= in[0] << 4
// amd64:-`.*SP.*`
out |= in[1] << 7
// amd64:-`.*SP.*`
out |= in[2] << 10
// amd64:-`.*SP.*`
out |= in[3] << 13
// amd64:-`.*SP.*`
out |= in[4] << 16
// amd64:-`.*SP.*`
out |= in[5] << 19
// amd64:-`.*SP.*`
out |= in[6] << 22
// amd64:-`.*SP.*`
out |= in[7] << 25
// amd64:-`.*SP.*`
out |= in[8] << 28
// amd64:-`.*SP.*`
out |= in[9] << 31
// amd64:-`.*SP.*`
out |= in[10] << 34
// amd64:-`.*SP.*`
out |= in[11] << 37
// amd64:-`.*SP.*`
out |= in[12] << 40
// amd64:-`.*SP.*`
out |= in[13] << 43
// amd64:-`.*SP.*`
out |= in[14] << 46
// amd64:-`.*SP.*`
out |= in[15] << 49
// amd64:-`.*SP.*`
out |= in[16] << 52
// amd64:-`.*SP.*`
out |= in[17] << 55
// amd64:-`.*SP.*`
out |= in[18] << 58
// amd64:-`.*SP.*`
out |= in[19] << 61
return out
}