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TheRock/compiler/amd-llvm/llvm/test/Transforms/SimpleLoopUnswitch/pr37888.ll
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2026-09-02 16:34:47 -07:00

39 lines
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LLVM

; RUN: opt -passes=simple-loop-unswitch,loop-deletion -verify-memoryssa -S < %s | FileCheck %s
;
; Check that when we do unswitching where we re-enqueue the loop to be processed
; again, but manage to delete the loop before ever getting to iterate on it, it
; doesn't crash the legacy pass manager.
target triple = "x86_64-unknown-linux-gnu"
define void @pr37888() {
; CHECK-LABEL: define void @pr37888()
entry:
%tobool = icmp ne i16 undef, 0
br label %for.body
; CHECK: %[[TOBOOL:.*]] = icmp ne
; CHECK-NEXT: br i1 %[[TOBOOL]], label %if.then, label %[[ENTRY_SPLIT:.*]]
;
; CHECK: [[ENTRY_SPLIT]]:
; CHECK-NEXT: br label %for.end
for.body:
br i1 %tobool, label %if.then, label %if.end
if.then:
unreachable
; CHECK: if.then:
; CHECK-NEXT: unreachable
if.end:
br label %for.inc
for.inc:
br i1 false, label %for.body, label %for.end
for.end:
ret void
; CHECK: for.end:
; CHECK-NEXT: ret void
}