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authorAndrew Trick <atrick@apple.com>2013-03-26 03:14:53 +0000
committerAndrew Trick <atrick@apple.com>2013-03-26 03:14:53 +0000
commite74c2e86cb405963ba9c4043a1d0ca00b8f85fbe (patch)
tree5fd5bcbbb92b96454f5a6dc78f4785703feead73 /tools/llvm-extract
parent7fc162f893d67ffd96fdb19e2eb9a03b4621f0c0 (diff)
Fix SCEV forgetMemoizedResults should search and destroy backedge exprs.
Fixes PR15570: SEGV: SCEV back-edge info invalid after dead code removal. Indvars creates a SCEV expression for the loop's back edge taken count, then determines that the comparison is always true and removes it. When loop-unroll asks for the expression, it contains a NULL SCEVUnknkown (as a CallbackVH). forgetMemoizedResults should invalidate the loop back edges expression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177986 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'tools/llvm-extract')
0 files changed, 0 insertions, 0 deletions