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TheRock/compiler/amd-llvm/llvm/test/Transforms/ADCE/2002-05-23-ZeroArgPHITest.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

36 lines
1.5 KiB
LLVM

; This testcase contains a entire loop that should be removed. The only thing
; left is the store instruction in BB0. The problem this testcase was running
; into was that when the reg109 PHI was getting zero predecessors, it was
; removed even though there were uses still around. Now the uses are filled
; in with a dummy value before the PHI is deleted.
;
; RUN: opt < %s -S -passes=adce | grep bb1
; RUN: opt < %s -S -passes=adce -adce-remove-loops | FileCheck %s
%node_t = type { ptr, ptr, ptr, ptr, ptr, i32, i32 }
define void @localize_local(ptr %nodelist) {
bb0:
%nodelist.upgrd.1 = alloca ptr ; <ptr> [#uses=2]
store ptr %nodelist, ptr %nodelist.upgrd.1
br label %bb1
bb1: ; preds = %bb0
%reg107 = load ptr, ptr %nodelist.upgrd.1 ; <ptr> [#uses=2]
%cond211 = icmp eq ptr %reg107, null ; <i1> [#uses=1]
; CHECK: br label %bb3
br i1 %cond211, label %bb3, label %bb2
bb2: ; preds = %bb2, %bb1
%reg109 = phi ptr [ %reg110, %bb2 ], [ %reg107, %bb1 ] ; <ptr> [#uses=1]
%reg212 = getelementptr %node_t, ptr %reg109, i64 0, i32 1 ; <ptr> [#uses=1]
%reg110 = load ptr, ptr %reg212 ; <ptr> [#uses=2]
%cond213 = icmp ne ptr %reg110, null ; <i1> [#uses=1]
; CHECK: br label %bb3
br i1 %cond213, label %bb2, label %bb3
bb3: ; preds = %bb2, %bb1
ret void
}