38b5f91aa5
This is a second try for CL 548317. When the go compiler compiles a function it saves the frame pointer on the stack and pushes the stack pointer. Thus it is safe to restore from the stack. For assembly function still use the mathematical based restore as users might use the frame pointer as scratch space. The results are very good, file size down 0.8% codesize down 2%. Files: file before after Δ % addr2line 3950752 3919200 -31552 -0.799% asm 7228164 7176284 -51880 -0.718% buildid 3813377 3782545 -30832 -0.809% cgo 6184696 6135728 -48968 -0.792% compile 37066595 36734315 -332280 -0.896% covdata 4529478 4497638 -31840 -0.703% cover 7906781 7840805 -65976 -0.834% dist 5329896 5285504 -44392 -0.833% distpack 4028506 3996578 -31928 -0.793% fix 12706126 12614110 -92016 -0.724% link 10097646 10020534 -77112 -0.764% nm 3924002 3896858 -27144 -0.692% objdump 6570663 6523399 -47264 -0.719% pack 3255175 3229463 -25712 -0.790% pprof 20273692 20094988 -178704 -0.881% preprofile 3373625 3351201 -22424 -0.665% test2json 4563667 4524259 -39408 -0.864% trace 18675260 18526132 -149128 -0.799% vet 12297424 12200576 -96848 -0.788% total 175775525 174350117 -1425408 -0.811% Code: total 45787786 44851997 -935789 -2.044% Change-Id: Ie20cb5a90b25e5dfe3b2ce2d6e73a6b049bc53a5 Reviewed-on: https://go-review.googlesource.com/c/go/+/801860 Reviewed-by: Carlos Amedee <carlos@golang.org> Auto-Submit: Jorropo <jorropo.pgm@gmail.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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