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TheRock/compiler/amd-llvm/llvm/test/Analysis/ValueTracking/select-pattern.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

50 lines
1.0 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=simplifycfg < %s -S | FileCheck %s
; The dead code would cause a select that had itself
; as an operand to be analyzed. This would then cause
; infinite recursion and eventual crash.
define void @PR36045(i1 %t, ptr %b) {
; CHECK-LABEL: @PR36045(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = xor i1 [[T:%.*]], true
; CHECK-NEXT: call void @llvm.assume(i1 [[TMP0]])
; CHECK-NEXT: ret void
;
entry:
br i1 %t, label %if, label %end
if:
br i1 %t, label %unreach, label %pre
unreach:
unreachable
pre:
%p = phi i32 [ 70, %if ], [ %sel, %for ]
br label %for
for:
%cmp = icmp sgt i32 %p, 8
%add = add i32 %p, 2
%sel = select i1 %cmp, i32 %p, i32 %add
%cmp21 = icmp ult i32 %sel, 21
br i1 %cmp21, label %pre, label %for.end
for.end:
br i1 %t, label %unreach2, label %then12
then12:
store i32 0, ptr %b
br label %unreach2
unreach2:
%spec = phi i32 [ %sel, %for.end ], [ 42, %then12 ]
unreachable
end:
ret void
}