mirror of
https://github.com/golang/go
synced 2024-09-28 23:14:38 -06:00
527829a7cb
This commit is aimed at improving the readability and consistency of the code base. Extraneous newline characters were present after some return statements, creating unnecessary separation in the code. Fixes #64610 Change-Id: Ic1b05bf11761c4dff22691c2f1c3755f66d341f7 Reviewed-on: https://go-review.googlesource.com/c/go/+/548316 Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
421 lines
7.7 KiB
Go
421 lines
7.7 KiB
Go
// asmcheck
|
|
|
|
// Copyright 2018 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.
|
|
|
|
package codegen
|
|
|
|
import "math/bits"
|
|
|
|
/************************************
|
|
* 64-bit instructions
|
|
************************************/
|
|
|
|
func bitcheck64_constleft(a uint64) (n int) {
|
|
// amd64:"BTQ\t[$]63"
|
|
if a&(1<<63) != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTQ\t[$]60"
|
|
if a&(1<<60) != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]0"
|
|
if a&(1<<0) != 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func bitcheck64_constright(a [8]uint64) (n int) {
|
|
// amd64:"BTQ\t[$]63"
|
|
if (a[0]>>63)&1 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTQ\t[$]63"
|
|
if a[1]>>63 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTQ\t[$]63"
|
|
if a[2]>>63 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTQ\t[$]60"
|
|
if (a[3]>>60)&1 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]1"
|
|
if (a[4]>>1)&1 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]0"
|
|
if (a[5]>>0)&1 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]7"
|
|
if (a[6]>>5)&4 == 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func bitcheck64_var(a, b uint64) (n int) {
|
|
// amd64:"BTQ"
|
|
if a&(1<<(b&63)) != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTQ",-"BT.\t[$]0"
|
|
if (b>>(a&63))&1 != 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func bitcheck64_mask(a uint64) (n int) {
|
|
// amd64:"BTQ\t[$]63"
|
|
if a&0x8000000000000000 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTQ\t[$]59"
|
|
if a&0x800000000000000 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]0"
|
|
if a&0x1 != 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func biton64(a, b uint64) (n uint64) {
|
|
// amd64:"BTSQ"
|
|
n += b | (1 << (a & 63))
|
|
|
|
// amd64:"BTSQ\t[$]63"
|
|
n += a | (1 << 63)
|
|
|
|
// amd64:"BTSQ\t[$]60"
|
|
n += a | (1 << 60)
|
|
|
|
// amd64:"ORQ\t[$]1"
|
|
n += a | (1 << 0)
|
|
|
|
return n
|
|
}
|
|
|
|
func bitoff64(a, b uint64) (n uint64) {
|
|
// amd64:"BTRQ"
|
|
n += b &^ (1 << (a & 63))
|
|
|
|
// amd64:"BTRQ\t[$]63"
|
|
n += a &^ (1 << 63)
|
|
|
|
// amd64:"BTRQ\t[$]60"
|
|
n += a &^ (1 << 60)
|
|
|
|
// amd64:"ANDQ\t[$]-2"
|
|
n += a &^ (1 << 0)
|
|
|
|
return n
|
|
}
|
|
|
|
func bitcompl64(a, b uint64) (n uint64) {
|
|
// amd64:"BTCQ"
|
|
n += b ^ (1 << (a & 63))
|
|
|
|
// amd64:"BTCQ\t[$]63"
|
|
n += a ^ (1 << 63)
|
|
|
|
// amd64:"BTCQ\t[$]60"
|
|
n += a ^ (1 << 60)
|
|
|
|
// amd64:"XORQ\t[$]1"
|
|
n += a ^ (1 << 0)
|
|
|
|
return n
|
|
}
|
|
|
|
/************************************
|
|
* 32-bit instructions
|
|
************************************/
|
|
|
|
func bitcheck32_constleft(a uint32) (n int) {
|
|
// amd64:"BTL\t[$]31"
|
|
if a&(1<<31) != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]28"
|
|
if a&(1<<28) != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]0"
|
|
if a&(1<<0) != 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func bitcheck32_constright(a [8]uint32) (n int) {
|
|
// amd64:"BTL\t[$]31"
|
|
if (a[0]>>31)&1 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]31"
|
|
if a[1]>>31 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]31"
|
|
if a[2]>>31 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]28"
|
|
if (a[3]>>28)&1 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]1"
|
|
if (a[4]>>1)&1 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]0"
|
|
if (a[5]>>0)&1 == 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]7"
|
|
if (a[6]>>5)&4 == 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func bitcheck32_var(a, b uint32) (n int) {
|
|
// amd64:"BTL"
|
|
if a&(1<<(b&31)) != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL",-"BT.\t[$]0"
|
|
if (b>>(a&31))&1 != 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func bitcheck32_mask(a uint32) (n int) {
|
|
// amd64:"BTL\t[$]31"
|
|
if a&0x80000000 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]27"
|
|
if a&0x8000000 != 0 {
|
|
return 1
|
|
}
|
|
// amd64:"BTL\t[$]0"
|
|
if a&0x1 != 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func biton32(a, b uint32) (n uint32) {
|
|
// amd64:"BTSL"
|
|
n += b | (1 << (a & 31))
|
|
|
|
// amd64:"ORL\t[$]-2147483648"
|
|
n += a | (1 << 31)
|
|
|
|
// amd64:"ORL\t[$]268435456"
|
|
n += a | (1 << 28)
|
|
|
|
// amd64:"ORL\t[$]1"
|
|
n += a | (1 << 0)
|
|
|
|
return n
|
|
}
|
|
|
|
func bitoff32(a, b uint32) (n uint32) {
|
|
// amd64:"BTRL"
|
|
n += b &^ (1 << (a & 31))
|
|
|
|
// amd64:"ANDL\t[$]2147483647"
|
|
n += a &^ (1 << 31)
|
|
|
|
// amd64:"ANDL\t[$]-268435457"
|
|
n += a &^ (1 << 28)
|
|
|
|
// amd64:"ANDL\t[$]-2"
|
|
n += a &^ (1 << 0)
|
|
|
|
return n
|
|
}
|
|
|
|
func bitcompl32(a, b uint32) (n uint32) {
|
|
// amd64:"BTCL"
|
|
n += b ^ (1 << (a & 31))
|
|
|
|
// amd64:"XORL\t[$]-2147483648"
|
|
n += a ^ (1 << 31)
|
|
|
|
// amd64:"XORL\t[$]268435456"
|
|
n += a ^ (1 << 28)
|
|
|
|
// amd64:"XORL\t[$]1"
|
|
n += a ^ (1 << 0)
|
|
|
|
return n
|
|
}
|
|
|
|
// check direct operation on memory with constant and shifted constant sources
|
|
func bitOpOnMem(a []uint32, b, c, d uint32) {
|
|
// amd64:`ANDL\s[$]200,\s\([A-Z][A-Z0-9]+\)`
|
|
a[0] &= 200
|
|
// amd64:`ORL\s[$]220,\s4\([A-Z][A-Z0-9]+\)`
|
|
a[1] |= 220
|
|
// amd64:`XORL\s[$]240,\s8\([A-Z][A-Z0-9]+\)`
|
|
a[2] ^= 240
|
|
}
|
|
|
|
func bitcheckMostNegative(b uint8) bool {
|
|
// amd64:"TESTB"
|
|
return b&0x80 == 0x80
|
|
}
|
|
|
|
// Check AND masking on arm64 (Issue #19857)
|
|
|
|
func and_mask_1(a uint64) uint64 {
|
|
// arm64:`AND\t`
|
|
return a & ((1 << 63) - 1)
|
|
}
|
|
|
|
func and_mask_2(a uint64) uint64 {
|
|
// arm64:`AND\t`
|
|
return a & (1 << 63)
|
|
}
|
|
|
|
func and_mask_3(a, b uint32) (uint32, uint32) {
|
|
// arm/7:`BIC`,-`AND`
|
|
a &= 0xffffaaaa
|
|
// arm/7:`BFC`,-`AND`,-`BIC`
|
|
b &= 0xffc003ff
|
|
return a, b
|
|
}
|
|
|
|
// Check generation of arm64 BIC/EON/ORN instructions
|
|
|
|
func op_bic(x, y uint32) uint32 {
|
|
// arm64:`BIC\t`,-`AND`
|
|
return x &^ y
|
|
}
|
|
|
|
func op_eon(x, y, z uint32, a []uint32, n, m uint64) uint64 {
|
|
// arm64:`EON\t`,-`EOR`,-`MVN`
|
|
a[0] = x ^ (y ^ 0xffffffff)
|
|
|
|
// arm64:`EON\t`,-`EOR`,-`MVN`
|
|
a[1] = ^(y ^ z)
|
|
|
|
// arm64:`EON\t`,-`XOR`
|
|
a[2] = x ^ ^z
|
|
|
|
// arm64:`EON\t`,-`EOR`,-`MVN`
|
|
return n ^ (m ^ 0xffffffffffffffff)
|
|
}
|
|
|
|
func op_orn(x, y uint32) uint32 {
|
|
// arm64:`ORN\t`,-`ORR`
|
|
return x | ^y
|
|
}
|
|
|
|
// check bitsets
|
|
func bitSetPowerOf2Test(x int) bool {
|
|
// amd64:"BTL\t[$]3"
|
|
return x&8 == 8
|
|
}
|
|
|
|
func bitSetTest(x int) bool {
|
|
// amd64:"ANDL\t[$]9, AX"
|
|
// amd64:"CMPQ\tAX, [$]9"
|
|
return x&9 == 9
|
|
}
|
|
|
|
// mask contiguous one bits
|
|
func cont1Mask64U(x uint64) uint64 {
|
|
// s390x:"RISBGZ\t[$]16, [$]47, [$]0,"
|
|
return x & 0x0000ffffffff0000
|
|
}
|
|
|
|
// mask contiguous zero bits
|
|
func cont0Mask64U(x uint64) uint64 {
|
|
// s390x:"RISBGZ\t[$]48, [$]15, [$]0,"
|
|
return x & 0xffff00000000ffff
|
|
}
|
|
|
|
func issue44228a(a []int64, i int) bool {
|
|
// amd64: "BTQ", -"SHL"
|
|
return a[i>>6]&(1<<(i&63)) != 0
|
|
}
|
|
func issue44228b(a []int32, i int) bool {
|
|
// amd64: "BTL", -"SHL"
|
|
return a[i>>5]&(1<<(i&31)) != 0
|
|
}
|
|
|
|
func issue48467(x, y uint64) uint64 {
|
|
// arm64: -"NEG"
|
|
d, borrow := bits.Sub64(x, y, 0)
|
|
return x - d&(-borrow)
|
|
}
|
|
|
|
func foldConst(x, y uint64) uint64 {
|
|
// arm64: "ADDS\t[$]7",-"MOVD\t[$]7"
|
|
d, b := bits.Add64(x, 7, 0)
|
|
return b & d
|
|
}
|
|
|
|
func foldConstOutOfRange(a uint64) uint64 {
|
|
// arm64: "MOVD\t[$]19088744",-"ADD\t[$]19088744"
|
|
return a + 0x1234568
|
|
}
|
|
|
|
// Verify sign-extended values are not zero-extended under a bit mask (#61297)
|
|
func signextendAndMask8to64(a int8) (s, z uint64) {
|
|
// ppc64x: "MOVB", "ANDCC\t[$]1015,"
|
|
s = uint64(a) & 0x3F7
|
|
// ppc64x: -"MOVB", "ANDCC\t[$]247,"
|
|
z = uint64(uint8(a)) & 0x3F7
|
|
return
|
|
}
|
|
|
|
// Verify zero-extended values are not sign-extended under a bit mask (#61297)
|
|
func zeroextendAndMask8to64(a int8, b int16) (x, y uint64) {
|
|
// ppc64x: -"MOVB\t", -"ANDCC", "MOVBZ"
|
|
x = uint64(a) & 0xFF
|
|
// ppc64x: -"MOVH\t", -"ANDCC", "MOVHZ"
|
|
y = uint64(b) & 0xFFFF
|
|
return
|
|
}
|
|
|
|
// Verify rotate and mask instructions, and further simplified instructions for small types
|
|
func bitRotateAndMask(io64 [4]uint64, io32 [4]uint32, io16 [4]uint16, io8 [4]uint8) {
|
|
// ppc64x: "RLDICR\t[$]0, R[0-9]*, [$]47, R"
|
|
io64[0] = io64[0] & 0xFFFFFFFFFFFF0000
|
|
// ppc64x: "RLDICL\t[$]0, R[0-9]*, [$]16, R"
|
|
io64[1] = io64[1] & 0x0000FFFFFFFFFFFF
|
|
// ppc64x: -"SRD", -"AND", "RLDICL\t[$]60, R[0-9]*, [$]16, R"
|
|
io64[2] = (io64[2] >> 4) & 0x0000FFFFFFFFFFFF
|
|
// ppc64x: -"SRD", -"AND", "RLDICL\t[$]36, R[0-9]*, [$]28, R"
|
|
io64[3] = (io64[3] >> 28) & 0x0000FFFFFFFFFFFF
|
|
|
|
// ppc64x: "RLWNM\t[$]0, R[0-9]*, [$]4, [$]19, R"
|
|
io32[0] = io32[0] & 0x0FFFF000
|
|
// ppc64x: "RLWNM\t[$]0, R[0-9]*, [$]20, [$]3, R"
|
|
io32[1] = io32[1] & 0xF0000FFF
|
|
// ppc64x: -"RLWNM", MOVD, AND
|
|
io32[2] = io32[2] & 0xFFFF0002
|
|
|
|
var bigc uint32 = 0x12345678
|
|
// ppc64x: "ANDCC\t[$]22136"
|
|
io16[0] = io16[0] & uint16(bigc)
|
|
|
|
// ppc64x: "ANDCC\t[$]120"
|
|
io8[0] = io8[0] & uint8(bigc)
|
|
}
|