Manoj Gupta 647946fa14 llvm: Add support for "-fno-delete-null-pointer-checks" ... 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		2018-07-09 22:27:23 +00:00
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2010-09-02-Trunc.ll
2010-09-26-MergeConstantRange.ll
add.ll
alloca.ll
ashr.ll
basic.ll
conflict.ll
crash.ll
guards.ll
icmp.ll
non-null.ll	llvm: Add support for "-fno-delete-null-pointer-checks"	2018-07-09 22:27:23 +00:00
overflows.ll
phi-common-val.ll
pointer.ll	[ValueTracking] Fix endless recursion in isKnownNonZero()	2018-05-30 15:56:46 +00:00
pr35807.ll
range.ll
sdiv.ll
select.ll
srem.ll
udiv.ll
urem.ll