derek.holloway
7502bf64a4
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51 lines
1.9 KiB
LLVM
51 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=gvn -S | FileCheck %s
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; This test checks that we don't hang trying to split a critical edge in loadpre
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; when the control flow uses a callbr instruction.
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%struct.pluto = type <{ i8, i8 }>
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define void @widget(ptr %tmp1) {
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; CHECK-LABEL: @widget(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: callbr void asm sideeffect "", "!i,!i"()
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; CHECK-NEXT: to label [[BB4:%.*]] [label [[BB5:%.*]], label %bb.bb8_crit_edge]
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; CHECK: bb.bb8_crit_edge:
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; CHECK-NEXT: [[TMP10_PRE:%.*]] = load ptr, ptr [[TMP1:%.*]], align 8
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; CHECK-NEXT: br label [[BB8:%.*]]
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; CHECK: bb4:
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; CHECK-NEXT: br label [[BB5]]
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; CHECK: bb5:
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; CHECK-NEXT: [[TMP6:%.*]] = load ptr, ptr [[TMP1]], align 8
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds [[STRUCT_PLUTO:%.*]], ptr [[TMP6]], i64 0, i32 1
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; CHECK-NEXT: br label [[BB8]]
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; CHECK: bb8:
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; CHECK-NEXT: [[TMP10:%.*]] = phi ptr [ [[TMP6]], [[BB5]] ], [ [[TMP10_PRE]], [[BB_BB8_CRIT_EDGE:%.*]] ]
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; CHECK-NEXT: [[TMP9:%.*]] = phi ptr [ [[TMP7]], [[BB5]] ], [ null, [[BB_BB8_CRIT_EDGE]] ]
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; CHECK-NEXT: [[TMP12:%.*]] = load i8, ptr [[TMP10]], align 1
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; CHECK-NEXT: tail call void @spam(ptr [[TMP9]], i8 [[TMP12]])
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; CHECK-NEXT: ret void
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;
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bb:
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callbr void asm sideeffect "", "!i,!i"()
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to label %bb4 [label %bb5, label %bb8]
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bb4: ; preds = %bb
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br label %bb5
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bb5: ; preds = %bb4, %bb
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%tmp6 = load ptr, ptr %tmp1
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%tmp7 = getelementptr inbounds %struct.pluto, ptr %tmp6, i64 0, i32 1
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br label %bb8
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bb8: ; preds = %bb5, %bb
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%tmp9 = phi ptr [ %tmp7, %bb5 ], [ null, %bb ]
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%tmp10 = load ptr, ptr %tmp1
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%tmp12 = load i8, ptr %tmp10
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tail call void @spam(ptr %tmp9, i8 %tmp12)
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ret void
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}
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declare void @spam(ptr, i8)
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