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| author | fanzha02 <fannie.zhang@arm.com> | 2020-11-03 17:31:04 +0800 |
|---|---|---|
| committer | Fannie Zhang <Fannie.Zhang@arm.com> | 2022-03-25 01:24:44 +0000 |
| commit | 8ab42a945aef7c09189a60263c4450a65bc00a47 (patch) | |
| tree | afdcb50de88a5aa95abf5a24aa687188de4672b5 /test/codegen | |
| parent | a10a209b23f877c80d8a5f3ebda1ce4b492ac3a9 (diff) | |
| download | go-8ab42a945aef7c09189a60263c4450a65bc00a47.tar.xz | |
cmd/compile: merge ANDconst and UBFX into UBFX on arm64
Add a new rewrite rule to merge ANDconst and UBFX into
UBFX.
Add test cases.
Change-Id: I24d6442d0c956d7ce092c3a3858d4a3a41771670
Reviewed-on: https://go-review.googlesource.com/c/go/+/377054
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Diffstat (limited to 'test/codegen')
| -rw-r--r-- | test/codegen/bitfield.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/test/codegen/bitfield.go b/test/codegen/bitfield.go index 8327da6cf8..11f31ecf25 100644 --- a/test/codegen/bitfield.go +++ b/test/codegen/bitfield.go @@ -321,6 +321,12 @@ func ubfx15(x uint64) bool { return false } +// merge ANDconst and ubfx into ubfx +func ubfx16(x uint64) uint64 { + // arm64:"UBFX\t[$]4, R[0-9]+, [$]6",-"AND\t[$]63" + return ((x >> 3) & 0xfff) >> 1 & 0x3f +} + // Check that we don't emit comparisons for constant shifts. //go:nosplit func shift_no_cmp(x int) int { |