http://d.puremagic.com/issues/show_bug.cgi?id=11343
--- Comment #15 from Kenji Hara <k.hara...@gmail.com> 2013-10-30 03:12:27 PDT
---
(In reply to comment #13)
> (In reply to comment #8)
>
> A little test program:
[snip]
Hmm, strange. After moving out the nested static function 'make' to module
level, I got this generated code.
struct Foo {
int[3] arr;
this(int x) pure nothrow {
arr[0] = x;
arr[1] = x + 1;
arr[2] = x + 2;
}
}
// move out to module level
static int[3] make(in int x) pure nothrow {
typeof(return) a;
a[0] = x;
a[1] = x + 1;
a[2] = x + 2;
return a;
}
struct Bar {
immutable int[3] arr;
this(int x) pure nothrow {
this.arr = make(x); // NRVO works?
}
}
void main() {
auto f = Foo(5);
auto b = Bar(5);
}
Assembly:
C:\Users\khara\d\test.d:23 void main() {
0040209c: 83ec24 sub esp, 0x24
0040209f: 31c9 xor ecx, ecx
004020a1: ba05000000 mov edx, 0x5
004020a6: 53 push ebx
004020a7: bb06000000 mov ebx, 0x6
004020ac: 56 push esi
C:\Users\khara\d\test.d:24 auto f = Foo(5);
004020ad: 8d442408 lea eax, [esp+0x8]
004020b1: be07000000 mov esi, 0x7
004020b6: 8908 mov [eax], ecx
004020b8: 894804 mov [eax+0x4], ecx
004020bb: 894808 mov [eax+0x8], ecx
C:\Users\khara\d\test.d:4 arr[0] = x;
004020be: 8d442414 lea eax, [esp+0x14]
004020c2: 89542408 mov [esp+0x8], edx
C:\Users\khara\d\test.d:5 arr[1] = x + 1;
004020c6: 31d2 xor edx, edx
004020c8: 895c240c mov [esp+0xc], ebx
C:\Users\khara\d\test.d:6 arr[2] = x + 2;
004020cc: 89742410 mov [esp+0x10], esi
C:\Users\khara\d\test.d:25 auto b = Bar(5);
004020d0: 6a0c push 0xc
C:\Users\khara\d\test.d:20 this.arr = make(x); // NRVO works?
004020d2: 8908 mov [eax], ecx
004020d4: 894804 mov [eax+0x4], ecx
004020d7: 894808 mov [eax+0x8], ecx
004020da: 8d4c2424 lea ecx, [esp+0x24]
004020de: 8911 mov [ecx], edx
004020e0: 895104 mov [ecx+0x4], edx
004020e3: 895108 mov [ecx+0x8], edx
C:\Users\khara\d\test.d:11 a[0] = x;
004020e6: c744242405000000 mov dword [esp+0x24], 0x5
C:\Users\khara\d\test.d:12 a[1] = x + 1;
004020ee: 895c2428 mov [esp+0x28], ebx
C:\Users\khara\d\test.d:13 a[2] = x + 2;
004020f2: 8974242c mov [esp+0x2c], esi
C:\Users\khara\d\test.d:10 typeof(return) a;
004020f6: 51 push ecx
004020f7: 50 push eax
004020f8: e8e3110100 call 0x4132e0 _memmove // still exists...!
004020fd: 83c40c add esp, 0xc
C:\Users\khara\d\test.d:26 }
00402100: 31c0 xor eax, eax
00402102: 5e pop esi
00402103: 5b pop ebx
00402104: 83c424 add esp, 0x24
00402107: c3 ret
In 2.064a, the bug 10094 has been fixed. However we need to fix these (at least
two orthogonal) bugs for the next release.
I'll open new issues for them.
--
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
