forked from OSchip/llvm-project
d5e595b7a6
When LSR first adds SCEVs to BaseRegs, it only does it if `isZero()` has returned false. In the end, in invocation of `InsertFormula`, it asserts that all values there are still not zero constants. However between these two points, it makes some transformations, in particular extends them to wider type. SCEV does not give us guarantee that if `S` is not a constant zero, then `sext(S)` is also not a constant zero. It might have missed some optimizing transforms when it was calculating `S` and then made them when it took `sext`. For example, it may happen if previously optimizing transforms were limited by depth or somehow else. This patch adds a bailout when we may end up with a zero SCEV after extension. Differential Revision: https://reviews.llvm.org/D57565 Reviewed By: samparker llvm-svn: 353136 |
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| .. | ||
| 2008-08-14-ShadowIV.ll | ||
| 2009-11-10-LSRCrash.ll | ||
| 2011-07-20-DoubleIV.ll | ||
| 2011-11-29-postincphi.ll | ||
| 2011-12-04-loserreg.ll | ||
| 2012-01-13-phielim.ll | ||
| bin_power.ll | ||
| canonical-2.ll | ||
| canonical.ll | ||
| incorrect-offset-scaling.ll | ||
| ivchain-X86.ll | ||
| ivchain-stress-X86.ll | ||
| lit.local.cfg | ||
| lsr-expand-quadratic.ll | ||
| lsr-filtering-scaledreg.ll | ||
| lsr-insns-1.ll | ||
| lsr-insns-2.ll | ||
| macro-fuse-cmp.ll | ||
| nested-loop.ll | ||
| no_superflous_induction_vars.ll | ||
| pr17473.ll | ||
| pr28719.ll | ||
| pr40514.ll | ||
| sibling-loops.ll | ||