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addd1606be
Summary: Currently type test assume sequences inserted for devirtualization are removed during WPD. This patch delays their removal until later in the optimization pipeline. This is an enabler for upcoming enhancements to indirect call promotion, for example streamlined promotion guard sequences that compare against vtable address instead of the target function, when there are small number of possible vtables (either determined via WPD or by in-progress type profiling). We need the type tests to correlate the callsites with the address point offset needed in the compare sequence, and optionally to associated type summary info computed during WPD. This depends on work in D71913 to enable invocation of LowerTypeTests to drop type test assume sequences, which will now be invoked following ICP in the ThinLTO post-LTO link pipelines, and also after the existing export phase LowerTypeTests invocation in regular LTO (which is already after ICP). We cannot simply move the existing import phase LowerTypeTests pass later in the ThinLTO post link pipelines, as the comment in PassBuilder.cpp notes (it must run early because when performing CFI other passes may disturb the sequences it looks for). This necessitated adding a new type test resolution "Unknown" that we can use on the type test assume sequences previously removed by WPD, that we now want LTT to ignore. Depends on D71913. Reviewers: pcc, evgeny777 Subscribers: mehdi_amini, Prazek, hiraditya, steven_wu, dexonsmith, arphaman, davidxl, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D73242 |
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| .. | ||
| CMakeLists.txt | ||
| LLLexer.cpp | ||
| LLLexer.h | ||
| LLParser.cpp | ||
| LLParser.h | ||
| LLToken.h | ||
| LLVMBuild.txt | ||
| Parser.cpp | ||