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Revert "[SCEV] Make computeExitLimit more simple and more powerful"

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This reverts commit 023c8be909.

This patch triggers miscompile of zlib on PowerPC platform. Most likely it is
caused by some pre-backend PPC-specific pass, but we don't clearly know the
reason yet. So we temporally revert this patch with intention to return it
once the problem is resolved. See bug 37229 for details.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330893 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Max Kazantsev
2018-04-26 02:07:40 +00:00
parent 2339c939d3
commit fa6d83b0ef
3 changed files with 59 additions and 52 deletions
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test/Transforms/LoopSimplify/preserve-scev.ll
+1 -1
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@@ -95,7 +95,7 @@ declare void @foo() nounwind
; CHECK: Loop %while.cond191: max backedge-taken count is 0
; CHECK: Loop %while.cond191: Predicated backedge-taken count is 0
; CHECK: Loop %while.cond191.outer: <multiple exits> Unpredictable backedge-taken count.
; CHECK: Loop %while.cond191.outer: max backedge-taken count is false
; CHECK: Loop %while.cond191.outer: Unpredictable max backedge-taken count.
; CHECK: Loop %while.cond191.outer: Unpredictable predicated backedge-taken count.
define void @mergeExit(i32 %MapAttrCount) nounwind uwtable ssp {
entry: