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18d0e6a14f
This appears to be useful only on amd64, and was specifically benchmarked on Apple Silicon and did not produce any benefit there. This CL adds the assembly instruction `PCALIGNMAX align,amount` which aligns to `align` if that can be achieved with `amount` or fewer bytes of padding. (0 means never, but will align the enclosing function.) Specifically, if low-order-address-bits + amount are greater than or equal to align; thus, `PCALIGNMAX 64,63` is the same as `PCALIGN 64` and `PCALIGNMAX 64,0` will never emit any alignment, but will still cause the function itself to be aligned to (at least) 64 bytes. Change-Id: Id51a056f1672f8095e8f755e01f72836c9686aa3 Reviewed-on: https://go-review.googlesource.com/c/go/+/577935 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org>
82 lines
6.4 KiB
Go
82 lines
6.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Debug arguments, set by -d flag.
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package base
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// Debug holds the parsed debugging configuration values.
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var Debug DebugFlags
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// DebugFlags defines the debugging configuration values (see var Debug).
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// Each struct field is a different value, named for the lower-case of the field name.
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// Each field must be an int or string and must have a `help` struct tag.
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//
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// The -d option takes a comma-separated list of settings.
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// Each setting is name=value; for ints, name is short for name=1.
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type DebugFlags struct {
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AlignHot int `help:"enable hot block alignment (currently requires -pgo)" concurrent:"ok"`
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Append int `help:"print information about append compilation"`
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Checkptr int `help:"instrument unsafe pointer conversions\n0: instrumentation disabled\n1: conversions involving unsafe.Pointer are instrumented\n2: conversions to unsafe.Pointer force heap allocation" concurrent:"ok"`
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Closure int `help:"print information about closure compilation"`
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Defer int `help:"print information about defer compilation"`
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DisableNil int `help:"disable nil checks" concurrent:"ok"`
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DumpInlFuncProps string `help:"dump function properties from inl heuristics to specified file"`
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DumpInlCallSiteScores int `help:"dump scored callsites during inlining"`
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InlScoreAdj string `help:"set inliner score adjustments (ex: -d=inlscoreadj=panicPathAdj:10/passConstToNestedIfAdj:-90)"`
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InlBudgetSlack int `help:"amount to expand the initial inline budget when new inliner enabled. Defaults to 80 if option not set." concurrent:"ok"`
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DumpPtrs int `help:"show Node pointers values in dump output"`
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DwarfInl int `help:"print information about DWARF inlined function creation"`
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EscapeMutationsCalls int `help:"print extra escape analysis diagnostics about mutations and calls" concurrent:"ok"`
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Export int `help:"print export data"`
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Fmahash string `help:"hash value for use in debugging platform-dependent multiply-add use" concurrent:"ok"`
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GCAdjust int `help:"log adjustments to GOGC" concurrent:"ok"`
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GCCheck int `help:"check heap/gc use by compiler" concurrent:"ok"`
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GCProg int `help:"print dump of GC programs"`
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Gossahash string `help:"hash value for use in debugging the compiler"`
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InlFuncsWithClosures int `help:"allow functions with closures to be inlined" concurrent:"ok"`
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InlStaticInit int `help:"allow static initialization of inlined calls" concurrent:"ok"`
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Libfuzzer int `help:"enable coverage instrumentation for libfuzzer"`
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LoopVar int `help:"shared (0, default), 1 (private loop variables), 2, private + log"`
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LoopVarHash string `help:"for debugging changes in loop behavior. Overrides experiment and loopvar flag."`
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LocationLists int `help:"print information about DWARF location list creation"`
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MaxShapeLen int `help:"hash shape names longer than this threshold (default 500)" concurrent:"ok"`
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MergeLocals int `help:"merge together non-interfering local stack slots" concurrent:"ok"`
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MergeLocalsDumpFunc string `help:"dump specified func in merge locals"`
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MergeLocalsHash string `help:"hash value for debugging stack slot merging of local variables" concurrent:"ok"`
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MergeLocalsTrace int `help:"trace debug output for locals merging"`
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MergeLocalsHTrace int `help:"hash-selected trace debug output for locals merging"`
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Nil int `help:"print information about nil checks"`
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NoOpenDefer int `help:"disable open-coded defers" concurrent:"ok"`
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NoRefName int `help:"do not include referenced symbol names in object file" concurrent:"ok"`
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PCTab string `help:"print named pc-value table\nOne of: pctospadj, pctofile, pctoline, pctoinline, pctopcdata"`
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Panic int `help:"show all compiler panics"`
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Reshape int `help:"print information about expression reshaping"`
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Shapify int `help:"print information about shaping recursive types"`
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Slice int `help:"print information about slice compilation"`
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SoftFloat int `help:"force compiler to emit soft-float code" concurrent:"ok"`
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StaticCopy int `help:"print information about missed static copies" concurrent:"ok"`
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SyncFrames int `help:"how many writer stack frames to include at sync points in unified export data"`
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TypeAssert int `help:"print information about type assertion inlining"`
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WB int `help:"print information about write barriers"`
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ABIWrap int `help:"print information about ABI wrapper generation"`
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MayMoreStack string `help:"call named function before all stack growth checks" concurrent:"ok"`
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PGODebug int `help:"debug profile-guided optimizations"`
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PGOHash string `help:"hash value for debugging profile-guided optimizations" concurrent:"ok"`
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PGOInline int `help:"enable profile-guided inlining" concurrent:"ok"`
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PGOInlineCDFThreshold string `help:"cumulative threshold percentage for determining call sites as hot candidates for inlining" concurrent:"ok"`
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PGOInlineBudget int `help:"inline budget for hot functions" concurrent:"ok"`
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PGODevirtualize int `help:"enable profile-guided devirtualization; 0 to disable, 1 to enable interface devirtualization, 2 to enable function devirtualization" concurrent:"ok"`
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RangeFuncCheck int `help:"insert code to check behavior of range iterator functions" concurrent:"ok"`
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WrapGlobalMapDbg int `help:"debug trace output for global map init wrapping"`
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WrapGlobalMapCtl int `help:"global map init wrap control (0 => default, 1 => off, 2 => stress mode, no size cutoff)"`
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ZeroCopy int `help:"enable zero-copy string->[]byte conversions" concurrent:"ok"`
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ConcurrentOk bool // true if only concurrentOk flags seen
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}
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// DebugSSA is called to set a -d ssa/... option.
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// If nil, those options are reported as invalid options.
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// If DebugSSA returns a non-empty string, that text is reported as a compiler error.
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var DebugSSA func(phase, flag string, val int, valString string) string
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