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=== Generating the CG Profile === The CGProfile module pass simply gets the block profile count for each BB and scans for call instructions. For each call instruction it adds an edge from the current function to the called function with the current BB block profile count as the weight. After scanning all the functions, it generates an appending module flag containing the data. The format looks like: ``` !llvm.module.flags = !{!0} !0 = !{i32 5, !"CG Profile", !1} !1 = !{!2, !3, !4} ; List of edges !2 = !{void ()* @a, void ()* @b, i64 32} ; Edge from a to b with a weight of 32 !3 = !{void (i1)* @freq, void ()* @a, i64 11} !4 = !{void (i1)* @freq, void ()* @b, i64 20} ``` Differential Revision: https://reviews.llvm.org/D48105 llvm-svn: 335794 |
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