| commit | 6ec4c71eef730d56169255515fea3490c8a32650 | [log] [tgz] |
|---|---|---|
| author | Michael Munday <mike.munday@ibm.com> | Tue Sep 17 07:29:31 2019 -0700 |
| committer | Michael Munday <mike.munday@ibm.com> | Tue Oct 08 10:03:04 2019 +0000 |
| tree | f458a868bc4cbbc0f48c5cf2d4d93d7d2dd887c5 | |
| parent | 77f5adba554c80dc536f3076b2fa882d2cf0e992 [diff] |
cmd/compile: add SSA rules for s390x compare-and-branch instructions This commit adds SSA rules for the s390x combined compare-and-branch instructions. These have a shorter encoding than separate compare and branch instructions and they also don't clobber the condition code (a.k.a. flag register) reducing pressure on the flag allocator. I have deleted the 'loop_test.go' file and replaced it with a new codegen test which performs a wider range of checks. Object sizes from compilebench: name old object-bytes new object-bytes delta Template 562kB ± 0% 561kB ± 0% -0.28% (p=0.000 n=10+10) Unicode 217kB ± 0% 217kB ± 0% -0.17% (p=0.000 n=10+10) GoTypes 2.03MB ± 0% 2.02MB ± 0% -0.59% (p=0.000 n=10+10) Compiler 8.16MB ± 0% 8.11MB ± 0% -0.62% (p=0.000 n=10+10) SSA 27.4MB ± 0% 27.0MB ± 0% -1.45% (p=0.000 n=10+10) Flate 356kB ± 0% 356kB ± 0% -0.12% (p=0.000 n=10+10) GoParser 438kB ± 0% 436kB ± 0% -0.51% (p=0.000 n=10+10) Reflect 1.37MB ± 0% 1.37MB ± 0% -0.42% (p=0.000 n=10+10) Tar 485kB ± 0% 483kB ± 0% -0.39% (p=0.000 n=10+10) XML 630kB ± 0% 621kB ± 0% -1.45% (p=0.000 n=10+10) [Geo mean] 1.14MB 1.13MB -0.60% name old text-bytes new text-bytes delta HelloSize 763kB ± 0% 754kB ± 0% -1.30% (p=0.000 n=10+10) CmdGoSize 10.7MB ± 0% 10.6MB ± 0% -0.91% (p=0.000 n=10+10) [Geo mean] 2.86MB 2.82MB -1.10% Change-Id: Ibca55d9c0aa1254aee69433731ab5d26a43a7c18 Reviewed-on: https://go-review.googlesource.com/c/go/+/198037 Run-TryBot: Michael Munday <mike.munday@ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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