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https://github.com/golang/go
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[dev.ssa] cmd/compile: log line numbers in generated rewrite rules
This makes it easier to investigate and understand rewrite behavior. Change-Id: I790e8964922caf98362ce8a6d6972f52d83eefa8 Reviewed-on: https://go-review.googlesource.com/13588 Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder
parent
3d23afb913
commit
514ab7c385
@ -45,6 +45,35 @@ import (
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// If multiple rules match, the first one in file order is selected.
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type Rule struct {
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rule string
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lineno int
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}
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func (r Rule) String() string {
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return fmt.Sprintf("rule %q at line %d", r.rule, r.lineno)
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}
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func (r Rule) hash() string {
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return fmt.Sprintf("%02x", md5.Sum([]byte(r.rule)))
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}
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// parse returns the matching part of the rule, additional conditions, and the result.
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func (r Rule) parse() (match, cond, result string) {
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s := strings.Split(r.rule, "->")
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if len(s) != 2 {
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log.Fatalf("no arrow in %s", r)
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}
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match = strings.TrimSpace(s[0])
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result = strings.TrimSpace(s[1])
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cond = ""
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if i := strings.Index(match, "&&"); i >= 0 {
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cond = strings.TrimSpace(match[i+2:])
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match = strings.TrimSpace(match[:i])
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}
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return match, cond, result
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}
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func genRules(arch arch) {
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// Open input file.
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text, err := os.Open(arch.name + ".rules")
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@ -53,13 +82,15 @@ func genRules(arch arch) {
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}
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// oprules contains a list of rules for each block and opcode
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blockrules := map[string][]string{}
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oprules := map[string][]string{}
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blockrules := map[string][]Rule{}
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oprules := map[string][]Rule{}
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// read rule file
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scanner := bufio.NewScanner(text)
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rule := ""
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var lineno int
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for scanner.Scan() {
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lineno++
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line := scanner.Text()
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if i := strings.Index(line, "//"); i >= 0 {
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// Remove comments. Note that this isn't string safe, so
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@ -85,24 +116,25 @@ func genRules(arch arch) {
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op = op[:len(op)-1] // rule has only opcode, e.g. (ConstNil) -> ...
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}
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if isBlock(op, arch) {
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blockrules[op] = append(blockrules[op], rule)
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blockrules[op] = append(blockrules[op], Rule{rule: rule, lineno: lineno})
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} else {
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oprules[op] = append(oprules[op], rule)
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oprules[op] = append(oprules[op], Rule{rule: rule, lineno: lineno})
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}
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rule = ""
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}
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if unbalanced(rule) {
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log.Fatalf("unbalanced rule: %v\n", rule)
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}
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if err := scanner.Err(); err != nil {
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log.Fatalf("scanner failed: %v\n", err)
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}
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if unbalanced(rule) {
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log.Fatalf("unbalanced rule at line %d: %v\n", lineno, rule)
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}
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// Start output buffer, write header.
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w := new(bytes.Buffer)
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fmt.Fprintf(w, "// autogenerated from gen/%s.rules: do not edit!\n", arch.name)
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fmt.Fprintln(w, "// generated with: cd gen; go run *.go")
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fmt.Fprintln(w, "package ssa")
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fmt.Fprintln(w, "import \"fmt\"")
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fmt.Fprintf(w, "func rewriteValue%s(v *Value, config *Config) bool {\n", arch.name)
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fmt.Fprintln(w, "b := v.Block")
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@ -120,24 +152,9 @@ func genRules(arch arch) {
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// identity is invariant to adding/removing rules elsewhere
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// in the rules file. This is useful to squash spurious
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// diffs that would occur if we used rule index.
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rulehash := fmt.Sprintf("%02x", md5.Sum([]byte(rule)))
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// split at ->
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s := strings.Split(rule, "->")
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if len(s) != 2 {
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log.Fatalf("rule must contain exactly one arrow: %s", rule)
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}
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lhs := strings.TrimSpace(s[0])
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result := strings.TrimSpace(s[1])
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// split match into matching part and additional condition
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match := lhs
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cond := ""
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if i := strings.Index(match, "&&"); i >= 0 {
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cond = strings.TrimSpace(match[i+2:])
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match = strings.TrimSpace(match[:i])
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}
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rulehash := rule.hash()
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match, cond, result := rule.parse()
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fmt.Fprintf(w, "// match: %s\n", match)
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fmt.Fprintf(w, "// cond: %s\n", cond)
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fmt.Fprintf(w, "// result: %s\n", result)
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@ -152,6 +169,9 @@ func genRules(arch arch) {
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}
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genResult(w, arch, result)
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fmt.Fprintf(w, "if logRewriteRules {\n")
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fmt.Fprintf(w, " fmt.Println(\"rewrite %s.rules:%d\")", arch.name, rule.lineno)
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fmt.Fprintf(w, "}\n")
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fmt.Fprintf(w, "return true\n")
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fmt.Fprintf(w, "}\n")
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@ -174,23 +194,9 @@ func genRules(arch arch) {
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for _, op := range ops {
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fmt.Fprintf(w, "case %s:\n", blockName(op, arch))
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for _, rule := range blockrules[op] {
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rulehash := fmt.Sprintf("%02x", md5.Sum([]byte(rule)))
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// split at ->
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s := strings.Split(rule, "->")
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if len(s) != 2 {
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log.Fatalf("no arrow in rule %s", rule)
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}
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lhs := strings.TrimSpace(s[0])
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result := strings.TrimSpace(s[1])
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// split match into matching part and additional condition
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match := lhs
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cond := ""
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if i := strings.Index(match, "&&"); i >= 0 {
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cond = strings.TrimSpace(match[i+2:])
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match = strings.TrimSpace(match[:i])
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}
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rulehash := rule.hash()
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match, cond, result := rule.parse()
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fmt.Fprintf(w, "// match: %s\n", match)
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fmt.Fprintf(w, "// cond: %s\n", cond)
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fmt.Fprintf(w, "// result: %s\n", result)
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@ -198,7 +204,8 @@ func genRules(arch arch) {
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fail := fmt.Sprintf("{\ngoto end%s\n}\n", rulehash)
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fmt.Fprintf(w, "{\n")
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s = split(match[1 : len(match)-1]) // remove parens, then split
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s := split(match[1 : len(match)-1]) // remove parens, then split
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// check match of control value
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if s[1] != "nil" {
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@ -268,6 +275,9 @@ func genRules(arch arch) {
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fmt.Fprintln(w, "b.Likely = BranchUnknown")
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}
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fmt.Fprintf(w, "if logRewriteRules {\n")
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fmt.Fprintf(w, " fmt.Println(\"rewrite %s.rules:%d\")", arch.name, rule.lineno)
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fmt.Fprintf(w, "}\n")
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fmt.Fprintf(w, "return true\n")
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fmt.Fprintf(w, "}\n")
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@ -6,6 +6,11 @@ package ssa
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import "fmt"
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// Set to true to log all rewrite rules as they occur.
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// This is useful for figuring out whether a rule is triggering
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// and which rules are most heavily used.
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const logRewriteRules = false
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func applyRewrite(f *Func, rb func(*Block) bool, rv func(*Value, *Config) bool) {
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// repeat rewrites until we find no more rewrites
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var curb *Block
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File diff suppressed because it is too large
Load Diff
@ -2,6 +2,8 @@
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// generated with: cd gen; go run *.go
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package ssa
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import "fmt"
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func rewriteValuegeneric(v *Value, config *Config) bool {
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b := v.Block
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switch v.Op {
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@ -23,6 +25,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.AuxInt = c + d
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:23")
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}
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return true
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}
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goto end8c46df6f85a11cb1d594076b0e467908
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@ -46,6 +51,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.AuxInt = c + d
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:24")
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}
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return true
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}
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goto end145c1aec793b2befff34bc8983b48a38
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@ -72,6 +80,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v0.AddArg(idx)
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v.AddArg(v0)
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v.AddArg(mem)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:59")
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}
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return true
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}
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goto end4894dd7b58383fee5f8a92be08437c33
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@ -92,6 +103,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.resetArgs()
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v.Type = x.Type
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v.AddArg(x)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:38")
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}
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return true
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}
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goto end1ea17710dd4dd7ba4e710e0e4c7b5a56
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@ -112,6 +126,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.resetArgs()
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v.Type = x.Type
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v.AddArg(x)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:39")
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}
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return true
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}
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goto end9a04ed536496e292c27bef4414128cbf
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@ -132,6 +149,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.resetArgs()
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v.Type = x.Type
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v.AddArg(x)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:40")
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}
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return true
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}
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goto ended44e29d5968f0f7b86972b7bf417ab3
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@ -152,6 +172,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.resetArgs()
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v.Type = x.Type
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v.AddArg(x)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:37")
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}
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return true
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}
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goto end4d92ff3ba567d9afd38fc9ca113602ad
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@ -178,6 +201,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v2.Type = config.Frontend().TypeUintptr()
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v2.AuxInt = int64(len(s.(string)))
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v.AddArg(v2)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:68")
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}
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return true
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}
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goto end68cc91679848c7c30bd8b0a8ed533843
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@ -197,6 +223,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = true
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:30")
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}
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return true
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}
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goto enda503589f9b617e708a5ad3ddb047809f
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@ -216,6 +245,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = true
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:29")
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}
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return true
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}
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goto endc94ae3b97d0090257b02152e437b3e17
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@ -235,6 +267,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = true
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:28")
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}
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return true
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}
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goto end4d21cead60174989467a9c8202dbb91d
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@ -254,6 +289,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = true
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:31")
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}
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return true
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}
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goto end73dce8bba164e4f4a1dd701bf8cfb362
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@ -275,6 +313,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.resetArgs()
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v.AddArg(y)
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v.AddArg(x)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:51")
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}
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return true
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}
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goto endcea7f7399afcff860c54d82230a9a934
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@ -305,6 +346,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v1.Type = config.Frontend().TypeUintptr()
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v1.AuxInt = 0
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v.AddArg(v1)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:54")
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}
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return true
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}
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goto end540dc8dfbc66adcd3db2d7e819c534f6
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@ -328,6 +372,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = inBounds(c, d)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:27")
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}
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return true
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}
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goto enddfd340bc7103ca323354aec96b113c23
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@ -362,6 +409,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v1.AddArg(v2)
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v1.AddArg(mem)
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v.AddArg(v1)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:69")
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}
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return true
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}
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goto end18afa4a6fdd6d0b92ed292840898c8f6
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@ -385,6 +435,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.AuxInt = c * d
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:25")
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}
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return true
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}
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goto end7aea1048b5d1230974b97f17238380ae
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@ -408,6 +461,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.AuxInt = c * d
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:26")
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}
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return true
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}
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goto end808c190f346658bb1ad032bf37a1059f
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@ -427,6 +483,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = false
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:34")
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}
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return true
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}
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goto end192755dd3c2be992e9d3deb53794a8d2
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@ -446,6 +505,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = false
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:33")
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}
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return true
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}
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goto endeb23619fc85950a8df7b31126252c4dd
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@ -465,6 +527,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = false
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:32")
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}
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return true
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}
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goto endfc6eea780fb4056afb9e4287076da60c
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@ -484,6 +549,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.Aux = nil
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v.resetArgs()
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v.Aux = false
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:35")
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}
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return true
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}
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goto endcccf700d93c6d57765b80f92f7b3fa81
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@ -505,6 +573,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v.resetArgs()
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v.AddArg(y)
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v.AddArg(x)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:52")
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}
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return true
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}
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goto end94c68f7dc30c66ed42e507e01c4e5dc7
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@ -535,6 +606,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v1.Type = config.Frontend().TypeUintptr()
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v1.AuxInt = 0
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v.AddArg(v1)
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if logRewriteRules {
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fmt.Println("rewrite generic.rules:55")
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}
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return true
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}
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goto end67d723bb0f39a5c897816abcf411e5cf
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@ -561,6 +635,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v1.AuxInt = t.Elem().Size()
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v0.AddArg(v1)
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v.AddArg(v0)
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if logRewriteRules {
|
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fmt.Println("rewrite generic.rules:60")
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}
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return true
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}
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goto endf7546737f42c76a99699f241d41f491a
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@ -589,6 +666,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
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v0.AddArg(v1)
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v.AddArg(v0)
|
||||
v.AddArg(mem)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:46")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end6696811bf6bd45e505d24c1a15c68e70
|
||||
@ -617,6 +697,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v0.AddArg(v1)
|
||||
v.AddArg(v0)
|
||||
v.AddArg(mem)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:45")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end9844ce3e290e81355493141e653e37d5
|
||||
@ -638,6 +721,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v.resetArgs()
|
||||
v.AddArg(ptr)
|
||||
v.AddArg(mem)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:44")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end459613b83f95b65729d45c2ed663a153
|
||||
@ -669,6 +755,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v.AddArg(dst)
|
||||
v.AddArg(src)
|
||||
v.AddArg(mem)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:65")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end324ffb6d2771808da4267f62c854e9c8
|
||||
@ -706,6 +795,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v2.AddArg(v3)
|
||||
v2.AddArg(mem)
|
||||
v.AddArg(v2)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:72")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto enddf0c5a150f4b4bf6715fd2bd4bb4cc20
|
||||
@ -726,6 +818,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v.resetArgs()
|
||||
v.Type = len.Type
|
||||
v.AddArg(len)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:71")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end0d922460b7e5ca88324034f4bd6c027c
|
||||
@ -746,6 +841,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v.resetArgs()
|
||||
v.Type = ptr.Type
|
||||
v.AddArg(ptr)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:70")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end061edc5d85c73ad909089af2556d9380
|
||||
@ -772,6 +870,9 @@ func rewriteValuegeneric(v *Value, config *Config) bool {
|
||||
v0.AddArg(ptr)
|
||||
v.AddArg(v0)
|
||||
v.AddArg(mem)
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:61")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end16fdb45e1dd08feb36e3cc3fb5ed8935
|
||||
@ -801,6 +902,9 @@ func rewriteBlockgeneric(b *Block) bool {
|
||||
b.Succs = b.Succs[:1]
|
||||
b.Succs[0] = yes
|
||||
b.Likely = BranchUnknown
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:74")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end0f2bb0111a86be0436b44210dbd83a90
|
||||
@ -822,6 +926,9 @@ func rewriteBlockgeneric(b *Block) bool {
|
||||
b.Succs[0] = no
|
||||
b.Succs[1] = yes
|
||||
b.Likely *= -1
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:76")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto endebe19c1c3c3bec068cdb2dd29ef57f96
|
||||
@ -847,6 +954,9 @@ func rewriteBlockgeneric(b *Block) bool {
|
||||
b.Succs = b.Succs[:1]
|
||||
b.Succs[0] = yes
|
||||
b.Likely = BranchUnknown
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:77")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto end9ff0273f9b1657f4afc287562ca889f0
|
||||
@ -872,6 +982,9 @@ func rewriteBlockgeneric(b *Block) bool {
|
||||
b.Succs = b.Succs[:1]
|
||||
b.Succs[0] = no
|
||||
b.Likely = BranchUnknown
|
||||
if logRewriteRules {
|
||||
fmt.Println("rewrite generic.rules:78")
|
||||
}
|
||||
return true
|
||||
}
|
||||
goto endf401a4553c3c7c6bed64801da7bba076
|
||||
|
||||
Loading…
Reference in New Issue
Block a user