Crash in XMVector3Unproject / XMMatrixMultiply #57
Description
Hi,
I'm getting crashes in XMVector3Unproject although I'm only using stack allocated variables, e.g. NO XMVECTOR or XMMATRIX as a member variable (see Test3() below). I tried both WinSDKs 8.1 and the newest 10.xyz one, DirectXMath version 310 / 307. Haven't tried your newest github one yet. Compiler is VS 2017 Enterprise 15.3. Debug x86 native Win32.
Here is a small repro ( I also attached the repro as a solution)
#include "stdafx.h"
#include <DirectXMath.h>
#pragma comment(lib, "d3d11.lib")
/*#pragma pack(push)
#pragma pack(16)
// Please note this is just a test. I'm not storing any aligned vars in my real code. My real usage is seen in Test3()
__declspec(align(16)) struct TestStruct {
DirectX::XMMATRIX identity = DirectX::XMMatrixIdentity();;
DirectX::XMVECTOR mousepos1 = DirectX::XMVectorSet(400.0f, 200.0f, 0.00999999978f, 0);
} g_TestStruct;
#pragma pack(pop)*/
void Test1() {
DirectX::XMMATRIX identity = DirectX::XMMatrixIdentity();
DirectX::XMVECTOR mousepos1 = DirectX::XMVectorSet(400.0f, 200.0f, 0.00999999978f, 0);
DirectX::XMMATRIX Transform = DirectX::XMMatrixMultiply(identity, identity);
Transform = XMMatrixMultiply(Transform, identity);
}
/*void Test2() {
g_TestStruct.mousepos1 = DirectX::XMVector3Unproject(g_TestStruct.mousepos1, 0.0f, 0.0f, 1600.0f, 600.0f, 0.00999999978f, 1000.0f,
g_TestStruct.identity, g_TestStruct.identity, g_TestStruct.identity);
}*/
void Test3() {
DirectX::XMMATRIX identity = DirectX::XMMatrixIdentity();
DirectX::XMVECTOR mousepos1 = DirectX::XMVectorSet(400.0f, 200.0f, 0.00999999978f, 0);
mousepos1 = DirectX::XMVector3Unproject(mousepos1, 0.0f, 0.0f, 1600.0f, 600.0f, 0.00999999978f, 1000.0f,
identity, identity, identity); // crash in inline XMMATRIX XM_CALLCONV XMMatrixMultiply at vX = _mm_mul_ps(vX,M2.r[0]); called by Transform = XMMatrixMultiply(Transform, Projection);
}
int main()
{
Test1(); // works
//Test2(); //crash
Test3(); //crash
return 0;
}
Edit:
Just tested the newest version. Still crashes.
Note: I forgot to set SSE2 in the attached repro. However setting it to SSE2 still crashes. Fast (/fp:fast) or Precise (/fp:precise) doesn't matter either. However using (/arch:AVX) does not crash, unfortunately not every customer of mine is able to use AVX. I don't know whether AVX does have different alignment requirements or there really is a bug. Of course x64 works like a charm.