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Sanjoy Das 0714e3e245 [SCEV] Fix a latent bug in getPreStartForExtend

I could not come up a way to test this -- I think this bug is latent
today, and will not actually result in a miscompile.

In `getPreStartForExtend`, SCEV constructs `PreStart` as a sum of all of
`SA`'s operands except `Op`.  It also uses `SA`'s no-wrap flags, and
this is problematic because removing an element from an add expression
can make it signed-wrap.  E.g. if `SA` was `(127 + 1 + -1)`, then it
could safely be `<nsw>` (since `sext(127) + sext(1) + sext(-1)` ==
`sext(127 + 1 + -1)`), but `(127 + 1)` (== `PreStart` if `Op` is `-1`)
is not `<nsw>`.

Transferring `<nuw>` from `SA` to `PreStart` is safe, as far as I can
tell.

llvm-svn: 251097

2015-10-23 06:33:47 +00:00

clang

Use newly introduced interfaces in LLVM (NFC)

2015-10-22 22:25:11 +00:00

clang-tools-extra

Switch check_clang_tidy to argparse and add a -resource-dir argument.

2015-10-22 14:54:50 +00:00

compiler-rt

[msan] Re-submit test for process_vm_readv.

2015-10-23 00:00:22 +00:00

debuginfo-tests

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