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| author | Paul E. Murphy <murp@ibm.com> | 2023-09-18 17:14:03 -0500 |
|---|---|---|
| committer | Paul Murphy <murp@ibm.com> | 2023-10-04 19:10:19 +0000 |
| commit | 36ecff0893e8f30c2ff659acf8c62401f4dcebf7 (patch) | |
| tree | 0f50e6029ea9e5b7dc136f2af0030cb43db645c9 /test/codegen | |
| parent | e47cab13a5acfb99ed6e62eeb51772af94c5f526 (diff) | |
| download | go-36ecff0893e8f30c2ff659acf8c62401f4dcebf7.tar.xz | |
cmd/internal/obj/ppc64: generate small, shifted constants in register
Check for shifted 16b constants, and transform them to avoid the load
penalty. This should be much faster than loading, and reduce binary
size by reducing the constant pool size.
Change-Id: I6834e08be7ca88e3b77449d226d08d199db84299
Reviewed-on: https://go-review.googlesource.com/c/go/+/531119
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'test/codegen')
| -rw-r--r-- | test/codegen/constants.go | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/codegen/constants.go b/test/codegen/constants.go new file mode 100644 index 0000000000..756aeda5f7 --- /dev/null +++ b/test/codegen/constants.go @@ -0,0 +1,25 @@ +// asmcheck + +// Copyright 2023 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 + +func shifted16BitConstants(out [64]uint64) { + // ppc64x: "MOVD\t[$]8193,", "SLD\t[$]27," + out[0] = 0x0000010008000000 + // ppc64x: "MOVD\t[$]-32767", "SLD\t[$]26," + out[1] = 0xFFFFFE0004000000 + // ppc64x: "MOVD\t[$]-1", "SLD\t[$]48," + out[2] = 0xFFFF000000000000 + // ppc64x: "MOVD\t[$]65535", "SLD\t[$]44," + out[3] = 0x0FFFF00000000000 + + // ppc64x: "MOVD\t[$]i64.fffff00000000001[(]SB[)]" + out[4] = 0xFFFFF00000000001 + // ppc64x: "MOVD\t[$]i64.fffff80000000001[(]SB[)]" + out[5] = 0xFFFFF80000000001 + // ppc64x: "MOVD\t[$]i64.0ffff80000000000[(]SB[)]" + out[6] = 0x0FFFF80000000000 +} |