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Author SHA1 Message Date
Max Kazantsev 0ed79620c6 [SimplifyIndVars] Ignore dead users 
IndVarSimplify sometimes makes transforms basing on users that are trivially dead. In particular,
if DCE wasn't run before it, there may be a dead `sext/zext` in loop that will trigger widening
transforms, however it makes no sense to do it.

This patch teaches IndVarsSimplify ignore the mist trivial cases of that.

Differential Revision: https://reviews.llvm.org/D47974
Reviewed By: sanjoy

llvm-svn: 334567
 2018-06-13 02:25:32 +00:00
Benjamin Kramer 2f47a3fb07 Fix broken check lines. 
I really need to find a way to automate this, but I can't come up with a regex
that has no false positives while handling tricky cases like custom check
prefixes.

llvm-svn: 162097
 2012-08-17 12:28:26 +00:00
Andrew Trick a3f9043196 SCEV: Handle a corner case reducing AddRecExpr * AddRecExpr 
If integer overflow causes one of the terms to reach zero, that can
force the entire expression to zero.

Fixes PR12929: cast<Ty>() argument of incompatible type

llvm-svn: 157673
 2012-05-30 03:35:20 +00:00