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no-copy semantics for nested if

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```zig
export fn entry() void {
    var c = true;
    var x = if (c) u8(4) else if (c) u16(100) else u32(10);
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %c = alloca i1, align 1
  %x = alloca i32, align 4
  store i1 true, i1* %c, align 1, !dbg !44
  call void @llvm.dbg.declare(metadata i1* %c, metadata !39, metadata !DIExpression()), !dbg !45
  %0 = load i1, i1* %c, align 1, !dbg !46
  br i1 %0, label %Then2, label %Else, !dbg !46

Else:                                             ; preds = %Entry
  %1 = load i1, i1* %c, align 1, !dbg !47
  br i1 %1, label %Then, label %Else1, !dbg !47

Then:                                             ; preds = %Else
  br label %EndIf, !dbg !48

Else1:                                            ; preds = %Else
  br label %EndIf, !dbg !48

Then2:                                            ; preds = %Entry
  br label %EndIf3, !dbg !49

EndIf:                                            ; preds = %Else1, %Then
  %2 = phi i32 [ 100, %Then ], [ 10, %Else1 ], !dbg !48
  br label %EndIf3, !dbg !49

EndIf3:                                           ; preds = %EndIf, %Then2
  %3 = phi i32 [ 4, %Then2 ], [ %2, %EndIf ], !dbg !49
  store i32 %3, i32* %x, align 4, !dbg !49
  call void @llvm.dbg.declare(metadata i32* %x, metadata !42, metadata !DIExpression()), !dbg !50
  ret void, !dbg !51
}
```
This commit is contained in:
Andrew Kelley 2019-05-30 23:25:37 -04:00
parent a4aca78722
commit 95d9835898
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GPG Key ID: 7C5F548F728501A9
1 changed files with 2 additions and 1 deletions
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3
src/ir.cpp
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@ -14328,13 +14328,14 @@ static ZigType *ir_result_loc_expected_type(IrAnalyze *ira, ResultLoc *result_lo
switch (result_loc->id) {
case ResultLocIdInvalid:
case ResultLocIdPeerParent:
case ResultLocIdPeer:
zig_unreachable();
case ResultLocIdNone:
case ResultLocIdVar:
return nullptr;
case ResultLocIdReturn:
return ira->explicit_return_type;
case ResultLocIdPeer:
return reinterpret_cast<ResultLocPeer*>(result_loc)->parent->resolved_type;
}
zig_unreachable();
}