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optimize s=s where s is a struct #20580

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Dec 19, 2024
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optimize s=s where s is a struct #20580

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7 changes: 7 additions & 0 deletions compiler/src/dmd/backend/cgelem.d
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Original file line number Diff line number Diff line change
Expand Up @@ -3521,6 +3521,13 @@ elem * elstruct(elem *e, Goal goal)
return optelem(e, goal);
}

// Replace (e = e) with (e, e)
if (e.Eoper == OPstreq && el_match(e.E1, e.E2))
{
e.Eoper = OPcomma;
return optelem(e, goal);
}

if (!e.ET)
return e;
//printf("\tnumbytes = %d\n", cast(int)type_size(e.ET));
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21 changes: 21 additions & 0 deletions compiler/test/runnable/mars1.d
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Expand Up @@ -2507,6 +2507,26 @@ void test20574()

////////////////////////////////////////////////////////////////////////

struct S8
{
int x,y,z;
}

int test8x(S8 s)
{
s = s;
return s.y;
}

void test8()
{
S8 s;
s.y = 2;
assert(test8x(s) == 2);
}

////////////////////////////////////////////////////////////////////////

int main()
{
// All the various integer divide tests
Expand Down Expand Up @@ -2607,6 +2627,7 @@ int main()
test21835();
testDoWhileContinue();
test20574();
test8();

printf("Success\n");
return 0;
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