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llvm-project/llvm/test/Analysis/ScalarEvolution/unreachable-code.ll

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Avoid analyzing instructions in blocks not reachable from the entry block. They are lots of trouble, and they don't matter. This fixes PR6559. llvm-svn: 98103
2010-03-10 07:46:50 +08:00
; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
; CHECK: %t = add i64 %t, 1
[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 llvm-svn: 353017
2019-02-04 13:04:19 +08:00
; CHECK: --> undef
Avoid analyzing instructions in blocks not reachable from the entry block. They are lots of trouble, and they don't matter. This fixes PR6559. llvm-svn: 98103
2010-03-10 07:46:50 +08:00
define void @foo() {
entry:
ret void
dead:
%t = add i64 %t, 1
ret void
}