diff options
| author | Keith Randall <khr@golang.org> | 2026-01-30 14:16:40 -0800 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2026-03-20 13:51:47 -0700 |
| commit | c8df1410d50f69b50eb5e643d15b6a3aab0ada06 (patch) | |
| tree | f6b3ab8d0c87fa8d7875eb3fca15b3b769a77a01 /test/codegen | |
| parent | 51abbb12c478ad44949367c0c478ee8f87c1f6bf (diff) | |
| download | go-c8df1410d50f69b50eb5e643d15b6a3aab0ada06.tar.xz | |
cmd/compile: on arm64 pair a load with a load in a subsequent block
Look into the following block(s) for a load that can be paired with
the load we're trying to pair up.
This particularly helps the generated equality functions. Instead of doing
MOVD x(R0), R2
MOVD x(R1), R3
CMP R2, R3
BNE noteq
MOVD x+8(R0), R2
MOVD x+8(R1), R3
CMP R2, R3
BNE noteq
we do
LDP x(R0), (R2, R4)
LDP x(R1), (R3, R5)
CMP R2, R3
BNE noteq
CMP R4, R5
BNE noteq
Removes 5296 bytes of code from cmd/go.
Change-Id: I6368686892ac944783c8b07ed7252126d1ef4031
Reviewed-on: https://go-review.googlesource.com/c/go/+/740741
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'test/codegen')
| -rw-r--r-- | test/codegen/memcombine.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/test/codegen/memcombine.go b/test/codegen/memcombine.go index deac9e2091..6feef26ce8 100644 --- a/test/codegen/memcombine.go +++ b/test/codegen/memcombine.go @@ -1027,6 +1027,15 @@ func dwloadResult2(p *[2]int64) (int64, int64) { return p[1], p[0] } +func dwloadConditional(p *[2]int64) (int64, int64) { + // arm64:"LDP \\(R0\\), \\(R0, R1\\)" + x := p[0] + if x == 0 { + return x, 0 + } + return x, p[1] +} + // ---------------------------------- // // Arm64 double-register stores // // ---------------------------------- // |