diff options
| author | Cherry Zhang <cherryyz@google.com> | 2020-04-02 22:47:29 -0400 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2020-04-03 14:12:25 +0000 |
| commit | e18a5ba0ca142c64aa03c6fb500d69cbbaab1bb6 (patch) | |
| tree | 1b3fc169d772a1a06ff8bc7f0f2b8f73f140b8fb | |
| parent | 5dde10c3044f75fbcc29193608a7b7156a3c9ef6 (diff) | |
| download | go-e18a5ba0ca142c64aa03c6fb500d69cbbaab1bb6.tar.gz go-e18a5ba0ca142c64aa03c6fb500d69cbbaab1bb6.zip | |
cmd/link: in stack bound check, don't check a call repetitively
In stack bound check pass, check a call once, not over and over
again. Fix an accidental quadratic behavior...
In particular, switching to the new linker caused MIPS builders
noticeably slower. This CL fixes it.
Change-Id: Idd00c79e80af6278652c92a1d9d7bb2d194e9490
Reviewed-on: https://go-review.googlesource.com/c/go/+/227078
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
| -rw-r--r-- | src/cmd/link/internal/ld/lib.go | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go index 3f21fc54ef..f7b8e04ddf 100644 --- a/src/cmd/link/internal/ld/lib.go +++ b/src/cmd/link/internal/ld/lib.go @@ -2360,6 +2360,7 @@ func (sc *stkChk) check(up *chain, depth int) int { relocs := ldr.Relocs(s) var ch1 chain pcsp := obj.NewPCIter(uint32(ctxt.Arch.MinLC)) + ri := 0 for pcsp.Init(info.Pcsp()); !pcsp.Done; pcsp.Next() { // pcsp.value is in effect for [pcsp.pc, pcsp.nextpc). @@ -2370,8 +2371,8 @@ func (sc *stkChk) check(up *chain, depth int) int { } // Process calls in this span. - for i := 0; i < relocs.Count(); i++ { - r := relocs.At2(i) + for ; ri < relocs.Count(); ri++ { + r := relocs.At2(ri) if uint32(r.Off()) >= pcsp.NextPC { break } |