| Issue |
182452
|
| Summary |
Automatically adds ZExt or trunc to BuildArrayMalloc
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
VertexTse
|
I was writing code, and after I came across this problem, I wrote this test code:
```cs
var a = builder.BuildAlloca(ctx.Int32Type);
builder.BuildStore(CreateConstant(5), a);
_size = builder.BuildLoad2(ctx.Int32Type, a);
var _mem = builder.BuildArrayMalloc(LLType.Cast(@int.Type), _size);
```
and I get this IR code when compiling, why if the type is Int32 it adds ZExt, but if the size is set to Int64 it calls trunc?
```ll
%7 = alloca i32, align 4
store i32 5, ptr %7, align 4
%8 = load i32, ptr %7, align 4
%9 = zext i32 %8 to i32 ; Type too small for ZExt
%mallocsize = mul i32 %9, ptrtoint (ptr getelementptr (i8, ptr null, i32 1) to i32)
%10 = tail call ptr @malloc(i32 %mallocsize)
```
and when I compare two Int32 I get:
```ll
%4 = load i32, ptr %3, align 4
%5 = icmp eq i32 %4, i32 0 ; Both operands to ICmp instruction are not of the same type!
br i1 %5, label %IC_4, label %IC_5
```
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