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We create flag variable "__llvm_fs_discriminator__" in the binary to indicate that FSAFDO hierarchical discriminators are used. This variable might be GC'ed by the linker since it is not explicitly reference. I initially added the var to the use list in pass MIRFSDiscriminator but it did not work. It turned out the used global list is collected in lowering (before MIR pass) and then emitted in the end of pass pipeline. Here I add the variable to the use list in IR level's AddDiscriminators pass. The machine level code is still keep in the case IR's AddDiscriminators is not invoked. If this is the case, this just use -Wl,--export-dynamic-symbol=__llvm_fs_discriminator__ to force the emit. Differential Revision: https://reviews.llvm.org/D103988 |
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