/usr/src/gcc-5/debian/patches/go-escape-analysis4.diff is in gcc-5-source 5.3.1-14ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | # DP: gccgo: If unary & does not escape, the var does not escape.
If we have a unary & that takes the address of a variable, do
not force the variable to escape if the unary & does not
escape.
Index: b/src/gcc/go/gofrontend/expressions.cc
===================================================================
--- a/src/gcc/go/gofrontend/expressions.cc
+++ b/src/gcc/go/gofrontend/expressions.cc
@@ -3668,7 +3668,12 @@ Unary_expression::do_flatten(Gogo* gogo,
if (this->op_ == OPERATOR_AND)
{
- if (this->expr_->var_expression() != NULL)
+ // If this->escapes_ is false at this point, then it was set to
+ // false by an explicit call to set_does_not_escape, and the
+ // value does not escape. If this->escapes_ is true, we may be
+ // able to set it to false if taking the address of a variable
+ // that does not escape.
+ if (this->escapes_ && this->expr_->var_expression() != NULL)
{
Named_object* var = this->expr_->var_expression()->named_object();
if (var->is_variable())
|