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https://github.com/c64scene-ar/llvm-6502.git
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97b9b97853
good: LBB0_2: mov r2, r0 . . . mov r1, r2 bne LBB0_2 bad: LBB0_2: mov r2, r0 . . . @ BB#3: mov r1, r2 b LBB0_2 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111221 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
1020 B
LLVM
30 lines
1020 B
LLVM
; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
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; PHI elimination shouldn't break backedge.
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; rdar://8263994
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%struct.list_data_s = type { i16, i16 }
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%struct.list_head = type { %struct.list_head*, %struct.list_data_s* }
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define arm_apcscc %struct.list_head* @t(%struct.list_head* %list) nounwind {
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entry:
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%0 = icmp eq %struct.list_head* %list, null
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br i1 %0, label %bb2, label %bb
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bb:
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; CHECK: LBB0_2:
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; CHECK: bne LBB0_2
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; CHECK-NOT: b LBB0_2
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; CHECK: bx lr
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%list_addr.05 = phi %struct.list_head* [ %2, %bb ], [ %list, %entry ]
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%next.04 = phi %struct.list_head* [ %list_addr.05, %bb ], [ null, %entry ]
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%1 = getelementptr inbounds %struct.list_head* %list_addr.05, i32 0, i32 0
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%2 = load %struct.list_head** %1, align 4
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store %struct.list_head* %next.04, %struct.list_head** %1, align 4
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%3 = icmp eq %struct.list_head* %2, null
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br i1 %3, label %bb2, label %bb
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bb2:
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%next.0.lcssa = phi %struct.list_head* [ null, %entry ], [ %list_addr.05, %bb ]
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ret %struct.list_head* %next.0.lcssa
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}
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