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444df39ddc
This is a fix for PR35884. When we want to delete dead loop we must clean uses in unreachable blocks otherwise we'll get an assert during deletion of instructions from the loop. Reviewers: anna, davide Reviewed By: anna Subscribers: llvm-commits, lebedev.ri Differential Revision: https://reviews.llvm.org/D41943 llvm-svn: 322357
25 lines
577 B
LLVM
25 lines
577 B
LLVM
; RUN: opt < %s -loop-deletion -S | FileCheck %s
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; Checking that possible users of instruction from the loop in
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; unreachable blocks are handled.
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define i64 @foo() {
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entry:
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br label %invloop
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; CHECK-LABEL-NOT: invloop
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invloop:
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%indvar1 = phi i64 [ 3, %entry ], [ %indvar2, %invloop_iter ]
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%check = icmp ult i64 %indvar1, 400
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br i1 %check, label %invloop_iter, label %loopexit
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invloop_iter:
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%indvar2 = add i64 %indvar1, 1
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%baddef = add i64 0, 0
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br label %invloop
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loopexit:
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ret i64 0
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deadcode:
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; CHECK-LABEL: deadcode
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; CHECK: ret i64 undef
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ret i64 %baddef
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}
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