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test/codegen: port arm64 byte slice zeroing tests

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And delete them from asm_test.

Change-Id: Id533130470da9176a401cb94972f626f43a62148
Reviewed-on: https://go-review.googlesource.com/103656
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
This commit is contained in:
Alberto Donizetti 2018-03-30 14:15:15 +02:00
parent 4ed94ef1a8
commit f2abca90a2
2 changed files with 41 additions and 90 deletions
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41
test/codegen/memcombine.go
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@ -12,6 +12,10 @@ var sink64 uint64
var sink32 uint32
var sink16 uint16
// ------------- //
// Loading //
// ------------- //
func load_le64(b []byte) {
// amd64:`MOVQ\s\(.*\),`
// s390x:`MOVDBR\s\(.*\),`
@ -94,6 +98,10 @@ func load_be16_idx(b []byte, idx int) {
sink16 = binary.BigEndian.Uint16(b[idx:])
}
// ------------- //
// Storing //
// ------------- //
func store_le64(b []byte) {
// amd64:`MOVQ\s.*\(.*\)$`,-`SHR.`
// arm64:`MOVD`,-`MOV[WBH]`
@ -171,3 +179,36 @@ func store_be16_idx(b []byte, idx int) {
// arm64:`MOVH`,`REV16W`,-`MOVB`
binary.BigEndian.PutUint16(b[idx:], sink16)
}
// ------------- //
// Zeroing //
// ------------- //
// Check that zero stores are combined into larger stores
func zero_2(b1, b2 []byte) {
// bounds checks to guarantee safety of writes below
_, _ = b1[1], b2[1]
b1[0], b1[1] = 0, 0 // arm64:"MOVH\tZR",-"MOVB"
b2[1], b2[0] = 0, 0 // arm64:"MOVH\tZR",-"MOVB"
}
func zero_4(b1, b2 []byte) {
_, _ = b1[3], b2[3]
b1[0], b1[1], b1[2], b1[3] = 0, 0, 0, 0 // arm64:"MOVW\tZR",-"MOVB",-"MOVH"
b2[2], b2[3], b2[1], b2[0] = 0, 0, 0, 0 // arm64:"MOVW\tZR",-"MOVB",-"MOVH"
}
func zero_8(b []byte) {
_ = b[7]
b[0], b[1], b[2], b[3] = 0, 0, 0, 0
b[4], b[5], b[6], b[7] = 0, 0, 0, 0 // arm64:"MOVD\tZR",-"MOVB",-"MOVH",-"MOVW"
}
func zero_16(b []byte) {
_ = b[15]
b[0], b[1], b[2], b[3] = 0, 0, 0, 0
b[4], b[5], b[6], b[7] = 0, 0, 0, 0
b[8], b[9], b[10], b[11] = 0, 0, 0, 0
b[12], b[13], b[14], b[15] = 0, 0, 0, 0 // arm64:"STP",-"MOVB",-"MOVH",-"MOVW"
}