fac9472593
Reland #171963, #172639 and #173444, they are reverted in 86b9f90b9574b3a7d15d28a91f6316459dcfa046 because of introducing non-determinism in compiles. The non-determinism has been fixed in 9b8addffa70cee5b2acc5454712d9cf78ce45710.
82 lines
4.2 KiB
LLVM
82 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --tool ./build/bin/opt --version 6
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; RUN: opt -passes='simplifycfg<switch-to-lookup>' -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s
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;; As we replace the switch statement with a set of instructions that may more
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;; efficiently perform the conditional check, the DILocation of the switch
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;; should be propagated to all of its replacing instructions.
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @switch_of_powers_two_default_reachable(i32 %arg) !dbg !5 {
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; CHECK-LABEL: define i32 @switch_of_powers_two_default_reachable(
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; CHECK-SAME: i32 [[ARG:%.*]]) !dbg [[DBG5:![0-9]+]] {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: [[TMP0:%.*]] = call i32 @llvm.ctpop.i32(i32 [[ARG]]), !dbg [[DBG8:![0-9]+]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[TMP0]], 1, !dbg [[DBG8]]
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; CHECK-NEXT: br i1 [[TMP1]], label %[[ENTRY_SPLIT:.*]], label %[[RETURN:.*]], !dbg [[DBG8]]
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; CHECK: [[ENTRY_SPLIT]]:
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; CHECK-NEXT: [[TMP2:%.*]] = call i32 @llvm.cttz.i32(i32 [[ARG]], i1 true), !dbg [[DBG8]]
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ult i32 [[TMP2]], 7, !dbg [[DBG8]]
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; CHECK-NEXT: br i1 [[TMP3]], label %[[SWITCH_LOOKUP:.*]], label %[[RETURN]], !dbg [[DBG8]]
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; CHECK: [[SWITCH_LOOKUP]]:
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; CHECK-NEXT: [[TMP4:%.*]] = zext nneg i32 [[TMP2]] to i64, !dbg [[DBG8]]
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; CHECK-NEXT: [[SWITCH_GEP:%.*]] = getelementptr inbounds [7 x i32], ptr @switch.table.switch_of_powers_two_default_reachable, i64 0, i64 [[TMP4]], !dbg [[DBG8]]
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; CHECK-NEXT: [[SWITCH_LOAD:%.*]] = load i32, ptr [[SWITCH_GEP]], align 4, !dbg [[DBG8]]
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; CHECK-NEXT: br label %[[RETURN]], !dbg [[DBG8]]
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; CHECK: [[RETURN]]:
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; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ [[SWITCH_LOAD]], %[[SWITCH_LOOKUP]] ], [ 5, %[[ENTRY_SPLIT]] ], [ 5, %[[ENTRY]] ]
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; CHECK-NEXT: ret i32 [[PHI]]
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;
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entry:
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switch i32 %arg, label %default_case [
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i32 1, label %bb1
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i32 8, label %bb2
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i32 16, label %bb3
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i32 32, label %bb4
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i32 64, label %bb5
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], !dbg !8
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default_case: ; preds = %entry
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br label %return
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bb1: ; preds = %entry
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br label %return
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bb2: ; preds = %entry
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br label %return
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bb3: ; preds = %entry
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br label %return
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bb4: ; preds = %entry
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br label %return
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bb5: ; preds = %entry
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br label %return
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return: ; preds = %bb5, %bb4, %bb3, %bb2, %bb1, %default_case
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%phi = phi i32 [ 3, %bb1 ], [ 2, %bb2 ], [ 1, %bb3 ], [ 0, %bb4 ], [ 42, %bb5 ], [ 5, %default_case ]
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ret i32 %phi
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}
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!llvm.dbg.cu = !{!0}
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!llvm.debugify = !{!2, !3}
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!llvm.module.flags = !{!4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "debugloc-switch-powers-of-two.ll", directory: "/")
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!2 = !{i32 9}
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!3 = !{i32 1}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = distinct !DISubprogram(name: "switch_of_powers_two_default_reachable", linkageName: "switch_of_powers_two_default_reachable", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !7)
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!6 = !DISubroutineType(types: !7)
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!7 = !{}
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!8 = !DILocation(line: 1, column: 1, scope: !5)
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;.
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; CHECK: [[META0:![0-9]+]] = distinct !DICompileUnit(language: DW_LANG_C, file: [[META1:![0-9]+]], producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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; CHECK: [[META1]] = !DIFile(filename: "{{.*}}debugloc-switch-powers-of-two.ll", directory: {{.*}})
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; CHECK: [[DBG5]] = distinct !DISubprogram(name: "switch_of_powers_two_default_reachable", linkageName: "switch_of_powers_two_default_reachable", scope: null, file: [[META1]], line: 1, type: [[META6:![0-9]+]], scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: [[META0]], retainedNodes: [[META7:![0-9]+]])
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; CHECK: [[META6]] = !DISubroutineType(types: [[META7]])
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; CHECK: [[META7]] = !{}
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; CHECK: [[DBG8]] = !DILocation(line: 1, column: 1, scope: [[DBG5]])
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;.
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