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cmd/compile: stop using VARKILL

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With the introduction of stack objects, VARKILL information is
no longer needed.

With stack objects, an object is dead when there are no more static
references to it, and the stack scanner can't find any live pointers
to it. VARKILL information isn't used to establish live ranges for
address-taken variables any more. In effect, the last static reference
*is* the VARKILL, and there's an additional dynamic liveness check
during stack scanning.

Next CL will actually rip out the VARKILL opcodes.

Change-Id: I030a2ab867445cf4e0e69397911f8a2e2f0ed07b
Reviewed-on: https://go-review.googlesource.com/c/go/+/419234
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
This commit is contained in:
Keith Randall
2022-07-22 14:58:40 -07:00
parent 661146bc0b
commit 908499adec
8 changed files with 50 additions and 122 deletions

50
test/codegen/mapaccess.go

@ -234,29 +234,28 @@ func mapCompoundAssignmentString() {
var sinkAppend bool
// TODO: optimization is not applied because of mapslow flag.
func mapAppendAssignmentInt8() {
m := make(map[int8][]int8, 0)
var k int8 = 0
// 386:".*mapaccess"
// amd64:".*mapaccess"
// arm:".*mapaccess"
// arm64:".*mapaccess"
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k] = append(m[k], 1)
// 386:".*mapaccess"
// amd64:".*mapaccess"
// arm:".*mapaccess"
// arm64:".*mapaccess"
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k] = append(m[k], 1, 2, 3)
a := []int8{7, 8, 9, 0}
// 386:".*mapaccess"
// amd64:".*mapaccess"
// arm:".*mapaccess"
// arm64:".*mapaccess"
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k] = append(m[k], a...)
// Exceptions
@ -394,29 +393,28 @@ func mapAppendAssignmentInt64() {
m[k] = append(m[k+1], 100)
}
// TODO: optimization is not applied because of mapslow flag.
func mapAppendAssignmentComplex128() {
m := make(map[complex128][]complex128, 0)
var k complex128 = 0
// 386:".*mapaccess"
// amd64:".*mapaccess"
// arm:".*mapaccess"
// arm64:".*mapaccess"
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k] = append(m[k], 1)
// 386:".*mapaccess"
// amd64:".*mapaccess"
// arm:".*mapaccess"
// arm64:".*mapaccess"
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k] = append(m[k], 1, 2, 3)
a := []complex128{7, 8, 9, 0}
// 386:".*mapaccess"
// amd64:".*mapaccess"
// arm:".*mapaccess"
// arm64:".*mapaccess"
// 386:-".*mapaccess"
// amd64:-".*mapaccess"
// arm:-".*mapaccess"
// arm64:-".*mapaccess"
m[k] = append(m[k], a...)
// Exceptions