[llvm-bugs] [Bug 33500] New: Investigate use of IR-based counter instrumentation for coverage
llvm-bugs at lists.llvm.org
Sun Jun 18 15:36:55 PDT 2017
Bug ID: 33500
Summary: Investigate use of IR-based counter instrumentation
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: vsk at apple.com
CC: llvm-bugs at lists.llvm.org
Coverage makes use of frontend-based PGO instrumentation, which is much less
efficient than the IR-based kind, primarily because it has no visibility into
LLVM's inlining decisions. This results in instrumented basic blocks which
contain multiple (redundant) counter increments. If we can find a way to map
counters inserted by IR PGO to AST nodes, we could improve the situation.
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