编译器"Optimizes"输出对象初始化函数

Question

在使用名为pipelineInfo的对象之前，我需要填充该对象。为了填充对象，我使用了一个名为createPipelineInfo的函数。当我使用visualstudios编译调试构建时，这工作得非常好，但当我尝试编译发布构建时；优化"；输出整个createPipelineInfo函数。

以下是初始化对象及其使用的调用：

VkGraphicsPipelineCreateInfo pipelineInfo = createPipelineInfo(shaderStages, vertexInputInfo, inputAssembly, viewportState, rasterizer,
multisampling, colorBlending, pipelineLayout, renderPass);
if (vkCreateGraphicsPipelines(logicalDevice, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &graphicsPipeline) != VK_SUCCESS) {
throw std::runtime_error("failed to create graphics pipeline!");
}

以下是createPipelineInfo函数：

inline static VkGraphicsPipelineCreateInfo createPipelineInfo(
const std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages,
const VkPipelineVertexInputStateCreateInfo& vertexInputInfo,
const VkPipelineInputAssemblyStateCreateInfo& inputAssembly,
const VkPipelineViewportStateCreateInfo& viewportState,
const VkPipelineRasterizationStateCreateInfo& rasterizer,
const VkPipelineMultisampleStateCreateInfo& multisampling,
const VkPipelineColorBlendStateCreateInfo& colorBlending,
const VkPipelineLayout& pipelineLayout,
const VkRenderPass& renderPass) {
VkGraphicsPipelineCreateInfo pipelineInfo{};
//Shader Stage
pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
pipelineInfo.stageCount = 2;
pipelineInfo.pStages = shaderStages.data();
//Fixed Pipeline Stage
pipelineInfo.pVertexInputState = &vertexInputInfo;
pipelineInfo.pInputAssemblyState = &inputAssembly;
pipelineInfo.pViewportState = &viewportState;
pipelineInfo.pRasterizationState = &rasterizer;
pipelineInfo.pMultisampleState = &multisampling;
//pipelineInfo.pDepthStencilState = &depthStencil;
pipelineInfo.pColorBlendState = &colorBlending;
pipelineInfo.pDynamicState = nullptr; // Optional
//Pipeline Layout
pipelineInfo.layout = pipelineLayout;
pipelineInfo.renderPass = renderPass;
pipelineInfo.subpass = 0;
pipelineInfo.basePipelineHandle = VK_NULL_HANDLE;
return pipelineInfo;
}

另一方面，如果我复制函数的主体并将其转储以代替函数调用，那么一切都会很好。

VkGraphicsPipelineCreateInfo pipelineInfo{};
//Shader Stage
pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
pipelineInfo.stageCount = 2;
pipelineInfo.pStages = shaderStages.data();
//Fixed Pipeline Stage
pipelineInfo.pVertexInputState = &vertexInputInfo;
pipelineInfo.pInputAssemblyState = &inputAssembly;
pipelineInfo.pViewportState = &viewportState;
pipelineInfo.pRasterizationState = &rasterizer;
pipelineInfo.pMultisampleState = &multisampling;
//pipelineInfo.pDepthStencilState = &depthStencil;
pipelineInfo.pColorBlendState = &colorBlending;
pipelineInfo.pDynamicState = nullptr; // Optional
//Pipeline Layout
pipelineInfo.layout = pipelineLayout;
pipelineInfo.renderPass = renderPass;
pipelineInfo.subpass = 0;
pipelineInfo.basePipelineHandle = VK_NULL_HANDLE;

if (vkCreateGraphicsPipelines(logicalDevice, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &graphicsPipeline) != VK_SUCCESS) {
throw std::runtime_error("failed to create graphics pipeline!");
}

我试图弄清楚为什么编译器正在优化函数调用，但失败了，我试图开发一种不涉及在每次调用函数时转储函数体的解决方案。

Answer 1

wild-guess：此参数由复制传递

const std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages

所以当用data方法调用获取其内容的地址时：

pipelineInfo.pStages = shaderStages.data();

您调用未定义的行为。编译器不够聪明，无法1(由于调用的复杂性，警告您不要引用临时，2(它不会在参数传递时自动执行复制省略。

修复：通过引用传递(注意，所有其他参数都使用通过引用模式是有原因的(

const std::array<VkPipelineShaderStageCreateInfo, 2> &shaderStages