llvm/test/Analysis/ScalarEvolution/unreachable-code.ll at 8fac8d9af44e4c27c19b4eac3a1f88ccce3d7fc0 - llvm - Free-Git: DMCA Non-Compliant

RPCS3/llvm

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Max Kazantsev feeb3cebe7 [SCEV] Do not bother creating separate SCEVUnknown for unreachable nodes

Currently, SCEV creates SCEVUnknown for every node of unreachable code. If we
have a huge amounts of such code, we will be littering SE with these nodes. We could
just state that they all are undef and save some memory.

Differential Revision: https://reviews.llvm.org/D57567
Reviewed By: sanjoy


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353017 91177308-0d34-0410-b5e6-96231b3b80d8

2019-02-04 05:04:19 +00:00

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 ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
 ; CHECK: %t = add i64 %t, 1
 ; CHECK: -->  undef
 define void @foo() {
 entry:
   ret void
 dead:
   %t = add i64 %t, 1
   ret void
 }