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TheRock/compiler/amd-llvm/llvm/test/Transforms/LoopStrengthReduce/scev-insertpt-bug.ll
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derek.holloway 7502bf64a4
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

48 lines
1.6 KiB
LLVM

; RUN: opt < %s -loop-reduce -S
; Test that SCEV insertpoint's don't get corrupted and cause an
; invalid instruction to be inserted in a block other than its parent.
; See http://reviews.llvm.org/D20703 for context.
define void @test() {
entry:
%bf.load = load i32, ptr null, align 4
%bf.clear = lshr i32 %bf.load, 1
%div = and i32 %bf.clear, 134217727
%sub = add nsw i32 %div, -1
%0 = zext i32 %sub to i64
br label %while.cond
while.cond: ; preds = %cond.end, %entry
%indvars.iv = phi i64 [ %indvars.iv.next, %cond.end ], [ 0, %entry ]
%cmp = icmp eq i64 %indvars.iv, %0
br i1 %cmp, label %cleanup16, label %while.body
while.body: ; preds = %while.cond
%1 = trunc i64 %indvars.iv to i32
%mul = shl i32 %1, 1
%add = add nuw i32 %mul, 2
%cmp3 = icmp ult i32 %add, 0
br i1 %cmp3, label %if.end, label %if.then
if.then: ; preds = %while.body
unreachable
if.end: ; preds = %while.body
br i1 false, label %cond.end, label %cond.true
cond.true: ; preds = %if.end
br label %cond.end
cond.end: ; preds = %cond.true, %if.end
%add7 = add i32 %1, 1
%cmp12 = icmp ugt i32 %add7, %sub
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
br i1 %cmp12, label %if.then13, label %while.cond
if.then13: ; preds = %cond.end
unreachable
cleanup16: ; preds = %while.cond
ret void
}