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647946fa14
Summary: Support for this option is needed for building Linux kernel. This is a very frequently requested feature by kernel developers. More details : https://lkml.org/lkml/2018/4/4/601 GCC option description for -fdelete-null-pointer-checks: This Assume that programs cannot safely dereference null pointers, and that no code or data element resides at address zero. -fno-delete-null-pointer-checks is the inverse of this implying that null pointer dereferencing is not undefined. This feature is implemented in LLVM IR in this CL as the function attribute "null-pointer-is-valid"="true" in IR (Under review at D47894). The CL updates several passes that assumed null pointer dereferencing is undefined to not optimize when the "null-pointer-is-valid"="true" attribute is present. Reviewers: t.p.northover, efriedma, jyknight, chandlerc, rnk, srhines, void, george.burgess.iv Reviewed By: efriedma, george.burgess.iv Subscribers: eraman, haicheng, george.burgess.iv, drinkcat, theraven, reames, sanjoy, xbolva00, llvm-commits Differential Revision: https://reviews.llvm.org/D47895 llvm-svn: 336613 |
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| .. | ||
| assume.ll | ||
| atomic-clobber.ll | ||
| basicaa-memcpy.ll | ||
| constant-memory.ll | ||
| cyclicphi.ll | ||
| forward-unreachable.ll | ||
| function-clobber.ll | ||
| function-mem-attrs.ll | ||
| invariant-groups.ll | ||
| lifetime-simple.ll | ||
| load-invariant.ll | ||
| many-dom-backedge.ll | ||
| many-doms.ll | ||
| multi-edges.ll | ||
| multiple-backedges-hal.ll | ||
| multiple-locations.ll | ||
| no-disconnected.ll | ||
| optimize-use.ll | ||
| phi-translation.ll | ||
| pr28880.ll | ||
| pr36883.ll | ||
| ptr-const-mem.ll | ||
| volatile-clobber.ll | ||