all: prealloc slice with possible minimum capabilities

4 files changed, 10 insertions, 9 deletions

diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index bcad5add4a..f04c45d18d 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -2649,8 +2649,9 @@ func ldshlibsyms(ctxt *Link, shlib string) {
 		Errorf("cannot read dep list from shared library %s: %v", libpath, err)
 		return
 	}
-	var deps []string
-	for _, dep := range strings.Split(string(depsbytes), "\n") {
+	depsSplit := strings.Split(string(depsbytes), "\n")
+	deps := make([]string, 0, len(depsSplit))
+	for _, dep := range depsSplit {
 		if dep == "" {
 			continue
 		}
diff --git a/src/cmd/link/internal/ld/macho_combine_dwarf.go b/src/cmd/link/internal/ld/macho_combine_dwarf.go
index 2b303cbdae..353dbd7327 100644
--- a/src/cmd/link/internal/ld/macho_combine_dwarf.go
+++ b/src/cmd/link/internal/ld/macho_combine_dwarf.go
@@ -229,7 +229,7 @@ func machoCompressSections(ctxt *Link, dwarfm *macho.File) ([]*macho.Section, []
 	}
 
 	dwarfseg := dwarfm.Segment("__DWARF")
-	var sects []*macho.Section
+	sects := make([]*macho.Section, 0, len(dwarfm.Sections))
 	var buf bytes.Buffer
 
 	for _, sect := range dwarfm.Sections {
diff --git a/src/cmd/link/internal/ld/xcoff.go b/src/cmd/link/internal/ld/xcoff.go
index 8edd4ccad8..ee507ca29f 100644
--- a/src/cmd/link/internal/ld/xcoff.go
+++ b/src/cmd/link/internal/ld/xcoff.go
@@ -1353,10 +1353,10 @@ func Loaderblk(ctxt *Link, off uint64) {
 }
 
 func (f *xcoffFile) writeLdrScn(ctxt *Link, globalOff uint64) {
-	var symtab []*XcoffLdSym64
-	var strtab []*XcoffLdStr64
-	var importtab []*XcoffLdImportFile64
-	var reloctab []*XcoffLdRel64
+	symtab := make([]*XcoffLdSym64, 0, len(f.loaderSymbols))
+	strtab := make([]*XcoffLdStr64, 0, len(f.loaderSymbols))
+	importtab := make([]*XcoffLdImportFile64, 0, len(f.dynLibraries))
+	reloctab := make([]*XcoffLdRel64, 0, len(f.loaderReloc))
 	var dynimpreloc []*XcoffLdRel64
 
 	// As the string table is updated in any loader subsection,
diff --git a/src/cmd/link/internal/loadxcoff/ldxcoff.go b/src/cmd/link/internal/loadxcoff/ldxcoff.go
index 8c0949ec70..85333cea1d 100644
--- a/src/cmd/link/internal/loadxcoff/ldxcoff.go
+++ b/src/cmd/link/internal/loadxcoff/ldxcoff.go
@@ -46,14 +46,14 @@ func Load(l *loader.Loader, arch *sys.Arch, localSymVersion int, input *bio.Read
 		return nil, fmt.Errorf("loadxcoff: %v: %v", pn, fmt.Sprintf(str, args...))
 	}
 
-	var ldSections []*ldSection
-
 	f, err := xcoff.NewFile((*xcoffBiobuf)(input))
 	if err != nil {
 		return nil, err
 	}
 	defer f.Close()
 
+	ldSections := make([]*ldSection, 0, len(f.Sections))
+
 	for _, sect := range f.Sections {
 		//only text, data and bss section
 		if sect.Type < xcoff.STYP_TEXT || sect.Type > xcoff.STYP_BSS {