The /QIntel-jcc-erratum option is available in Visual Studio 2019 version 16.5 and later.
Specifies that the compiler generates instructions to mitigate the performance impact caused by the Intel Jump Conditional Code (JCC) erratum microcode update in certain Intel processors.
Under /QIntel-jcc-erratum, the compiler detects jump and macro-fused jump instructions that cross or end on a 32-byte boundary. It aligns these instructions to the boundary. This change mitigates the performance impact of microcode updates that prevent the JCC erratum in certain Intel processors. For more information about the erratum, see Mitigations for Jump Conditional Code Erratum on the Intel website.
The /QIntel-jcc-erratum option is available in Visual Studio 2019 version 16.5 and later. This option is only available in compilers that target x86 and x64. The option isn't available in compilers that target ARM processors.
The /QIntel-jcc-erratum option is off by default, and works only in optimized builds. This option can increase code size.
/QIntel-jcc-erratum is incompatible with /clr.
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.
Select the Configuration Properties > C/C++ > Code Generation property page.
Select a value for the Enable Intel JCC Erratum Mitigation property. Choose OK to apply the change.
To set this compiler option programmatically
- See AdditionalOptions.
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