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TheRock/compiler/amd-llvm/llvm/test/Transforms/CodeGenPrepare/X86/split-indirectbr-duplicate-pred.ll
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derek.holloway 7502bf64a4
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2026-09-02 16:34:47 -07:00

32 lines
1.2 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes='require<profile-summary>,function(codegenprepare)' -S -mtriple=x86_64 < %s | FileCheck %s
; Test that SplitIndirectBrCriticalEdges does not crash when a predecessor
; block has a conditional branch with both targets pointing to the same
; destination (producing duplicate entries in the predecessor list).
define i32 @duplicate_pred_condbr(ptr %addr, i1 %cond) {
; CHECK-LABEL: define i32 @duplicate_pred_condbr(
; CHECK-SAME: ptr [[ADDR:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: indirectbr ptr [[ADDR]], [label %[[TARGET:.*]], label %[[COND_BB:.*]]]
; CHECK: [[COND_BB]]:
; CHECK-NEXT: br [[DOTSPLIT:label %.*]]
; CHECK: [[TARGET]]:
; CHECK-NEXT: br [[DOTSPLIT]]
; CHECK: [[_SPLIT:.*:]]
; CHECK-NEXT: [[MERGE:%.*]] = phi i32 [ 0, %[[TARGET]] ], [ 1, %[[COND_BB]] ]
; CHECK-NEXT: ret i32 [[MERGE]]
;
entry:
indirectbr ptr %addr, [label %target, label %cond.bb]
cond.bb:
br i1 %cond, label %target, label %target
target:
%result = phi i32 [ 0, %entry ], [ 1, %cond.bb ], [ 1, %cond.bb ]
ret i32 %result
}