![]() Note: The -S flag runs pre-processing and compilation steps only. We generate assembly listing for -O0 and -O1 by the commands.Ĭlang -S -O1 -mllvm -x86-asm-syntax=intel Example1.cppĬlang -S -mllvm -x86-asm-syntax=intel Example1.cpp What optimizations were turned on? For that let us go through the assembly listing of code generated using flags -O0 and -O1. If you compare binaries of the executables you get with the -O0 and -O1 flag, you will see some differences, but you cannot make out what caused these differences. The default Clang flag is -O0 which generates nonoptimized code. ![]() There is a definite reduction in the size of the executable. * -O4 and higher – Currently equivalent to -O3, see: Īrmed with this information, let us now try space optimization starting with -O1. For easy reference I am replicating the information here: The question is: What flags should be passed to Clang so that its space optimization is comparable or even surpasses the Cl?īefore we answer this question let us go through the documentation where code generation options for Clang flags are discussed. ![]() The Microsoft compiler is vocal about the compiler and linker versions used and it produces a smaller executable. Microsoft (R) Incremental Linker Version 1.0
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