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cmd/compile: optimize bounded shifts on wasm

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Use the shiftIsBounded function to generate more efficient
Shift instructions.

Updates #25167

Change-Id: Id350f8462dc3a7ed3bfed0bcbea2860b8f40048a
Reviewed-on: https://go-review.googlesource.com/c/go/+/182558
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Richard Musiol <neelance@gmail.com>
This commit is contained in:
Agniva De Sarker 2019-06-16 16:07:55 +05:30 • committed by Agniva De Sarker
parent b9ef4c0f56
commit 8fedb2d338
3 changed files with 50 additions and 5 deletions
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10
test/codegen/shift.go
View file

@ -102,9 +102,9 @@ func lshSignedMasked(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
// bounded shifts //
// ------------------ //
func lshGuarded64(v int64, s uint) int64 {
func rshGuarded64(v int64, s uint) int64 {
if s < 64 {
// s390x:-".*AND",-".*MOVDGE"
// s390x:-".*AND",-".*MOVDGE" wasm:-"Select",-".*LtU"
return v >> s
}
panic("shift too large")
@ -112,15 +112,15 @@ func lshGuarded64(v int64, s uint) int64 {
func rshGuarded64U(v uint64, s uint) uint64 {
if s < 64 {
// s390x:-".*AND",-".*MOVDGE"
// s390x:-".*AND",-".*MOVDGE" wasm:-"Select",-".*LtU"
return v >> s
}
panic("shift too large")
}
func rshGuarded64(v int64, s uint) int64 {
func lshGuarded64(v int64, s uint) int64 {
if s < 64 {
// s390x:-".*AND",-".*MOVDGE"
// s390x:-".*AND",-".*MOVDGE" wasm:-"Select",-".*LtU"
return v << s
}
panic("shift too large")