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llvm-project/llvm/test/Transforms/LoopVectorize/dbg-outer-loop-vect.ll
Florian Hahn 50b9ca4dda
[VPlan] Simplify Plan's entry in removeBranchOnConst. (#154510) 
After https://github.com/llvm/llvm-project/pull/153643, there may be a
BranchOnCond with constant condition in the entry block.

Simplify those in removeBranchOnConst. This removes a number of
redundant conditional branch from entry blocks.

In some cases, it may also make the original scalar loop unreachable,
because we know it will never execute. In that case, we need to remove
the loop from LoopInfo, because all unreachable blocks may dominate each
other, making LoopInfo invalid. In those cases, we can also completely
remove the loop, for which I'll share a follow-up patch.

Depends on https://github.com/llvm/llvm-project/pull/153643.

PR: https://github.com/llvm/llvm-project/pull/154510
2025-09-18 19:25:05 +01:00

173 lines
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -S -passes=loop-vectorize -enable-vplan-native-path -force-vector-interleave=1 -force-vector-width=4 | FileCheck %s
target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
define void @foo(ptr %h) !dbg !4 {
; CHECK-LABEL: define void @foo(
; CHECK-SAME: ptr [[H:%.*]]) !dbg [[DBG4:![0-9]+]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: #dbg_value(i64 0, [[META11:![0-9]+]], !DIExpression(), [[META20:![0-9]+]])
; CHECK-NEXT: br label %[[VECTOR_PH:.*]], !dbg [[DBG21:![0-9]+]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]], !dbg [[DBG21]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_LATCH:.*]] ], !dbg [[DBG22:![0-9]+]]
; CHECK-NEXT: br label %[[FOR_COND5_PREHEADER1:.*]], !dbg [[DBG21]]
; CHECK: [[FOR_COND5_PREHEADER1]]:
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i64> [ zeroinitializer, %[[VECTOR_BODY]] ], [ [[TMP5:%.*]], %[[FOR_COND5_PREHEADER1]] ], !dbg [[DBG23:![0-9]+]]
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr i32, ptr [[H]], <4 x i64> [[VEC_PHI]]
; CHECK-NEXT: call void @llvm.masked.scatter.v4i32.v4p0(<4 x i32> zeroinitializer, <4 x ptr> [[TMP0]], i32 4, <4 x i1> splat (i1 true)), !dbg [[DBG24:![0-9]+]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr i32, <4 x ptr> [[TMP0]], i64 1, !dbg [[DBG26:![0-9]+]]
; CHECK-NEXT: call void @llvm.masked.scatter.v4i32.v4p0(<4 x i32> splat (i32 1), <4 x ptr> [[TMP2]], i32 4, <4 x i1> splat (i1 true)), !dbg [[DBG24]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr i32, <4 x ptr> [[TMP0]], i64 2, !dbg [[DBG26]]
; CHECK-NEXT: call void @llvm.masked.scatter.v4i32.v4p0(<4 x i32> splat (i32 2), <4 x ptr> [[TMP3]], i32 4, <4 x i1> splat (i1 true)), !dbg [[DBG24]]
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i32, <4 x ptr> [[TMP0]], i64 3, !dbg [[DBG26]]
; CHECK-NEXT: call void @llvm.masked.scatter.v4i32.v4p0(<4 x i32> splat (i32 3), <4 x ptr> [[TMP4]], i32 4, <4 x i1> splat (i1 true)), !dbg [[DBG24]]
; CHECK-NEXT: [[TMP5]] = add nuw nsw <4 x i64> [[VEC_PHI]], splat (i64 1), !dbg [[DBG27:![0-9]+]]
; CHECK-NEXT: [[TMP6:%.*]] = icmp eq <4 x i64> [[TMP5]], splat (i64 5), !dbg [[DBG28:![0-9]+]]
; CHECK-NEXT: [[TMP7:%.*]] = extractelement <4 x i1> [[TMP6]], i32 0, !dbg [[DBG29:![0-9]+]]
; CHECK-NEXT: br i1 [[TMP7]], label %[[VECTOR_LATCH]], label %[[FOR_COND5_PREHEADER1]], !dbg [[DBG29]]
; CHECK: [[VECTOR_LATCH]]:
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4, !dbg [[DBG22]]
; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 20, !dbg [[DBG21]]
; CHECK-NEXT: br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !dbg [[DBG21]], !llvm.loop [[LOOP30:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br i1 false, label %[[EXIT:.*]], label %[[SCALAR_PH:.*]], !dbg [[DBG21]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: br label %[[FOR_COND1_PREHEADER:.*]], !dbg [[DBG21]]
; CHECK: [[FOR_COND1_PREHEADER]]:
; CHECK-NEXT: [[I_023:%.*]] = phi i64 [ 20, %[[SCALAR_PH]] ], [ [[INC13:%.*]], %[[FOR_COND_CLEANUP3:.*]] ]
; CHECK-NEXT: #dbg_value(i64 [[I_023]], [[META11]], !DIExpression(), [[META20]])
; CHECK-NEXT: br label %[[FOR_COND5_PREHEADER:.*]], !dbg [[DBG29]]
; CHECK: [[FOR_COND5_PREHEADER]]:
; CHECK-NEXT: [[L_022:%.*]] = phi i64 [ 0, %[[FOR_COND1_PREHEADER]] ], [ [[INC10:%.*]], %[[FOR_COND5_PREHEADER]] ], !dbg [[DBG23]]
; CHECK-NEXT: [[TMP9:%.*]] = getelementptr i32, ptr [[H]], i64 [[L_022]]
; CHECK-NEXT: store i32 0, ptr [[TMP9]], align 4, !dbg [[DBG24]]
; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr i32, ptr [[TMP9]], i64 1, !dbg [[DBG26]]
; CHECK-NEXT: store i32 1, ptr [[ARRAYIDX_1]], align 4, !dbg [[DBG24]]
; CHECK-NEXT: [[ARRAYIDX_2:%.*]] = getelementptr i32, ptr [[TMP9]], i64 2, !dbg [[DBG26]]
; CHECK-NEXT: store i32 2, ptr [[ARRAYIDX_2]], align 4, !dbg [[DBG24]]
; CHECK-NEXT: [[ARRAYIDX_3:%.*]] = getelementptr i32, ptr [[TMP9]], i64 3, !dbg [[DBG26]]
; CHECK-NEXT: store i32 3, ptr [[ARRAYIDX_3]], align 4, !dbg [[DBG24]]
; CHECK-NEXT: [[INC10]] = add nuw nsw i64 [[L_022]], 1, !dbg [[DBG27]]
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INC10]], 5, !dbg [[DBG28]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label %[[FOR_COND_CLEANUP3]], label %[[FOR_COND5_PREHEADER]], !dbg [[DBG29]]
; CHECK: [[FOR_COND_CLEANUP3]]:
; CHECK-NEXT: [[INC13]] = add nuw nsw i64 [[I_023]], 1, !dbg [[DBG22]]
; CHECK-NEXT: #dbg_value(i64 [[INC13]], [[META11]], !DIExpression(), [[META20]])
; CHECK-NEXT: [[EXITCOND24_NOT:%.*]] = icmp eq i64 [[INC13]], 23, !dbg [[DBG33:![0-9]+]]
; CHECK-NEXT: br i1 [[EXITCOND24_NOT]], label %[[EXIT]], label %[[FOR_COND1_PREHEADER]], !dbg [[DBG21]], !llvm.loop [[LOOP34:![0-9]+]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void, !dbg [[DBG35:![0-9]+]]
;
entry:
call void @llvm.dbg.value(metadata i64 0, metadata !11, metadata !DIExpression()), !dbg !20
br label %for.cond1.preheader, !dbg !21
for.cond1.preheader: ; preds = %entry, %for.cond.cleanup3
%i.023 = phi i64 [ 0, %entry ], [ %inc13, %for.cond.cleanup3 ]
call void @llvm.dbg.value(metadata i64 %i.023, metadata !11, metadata !DIExpression()), !dbg !20
br label %for.cond5.preheader, !dbg !22
for.cond5.preheader: ; preds = %for.cond1.preheader, %for.cond5.preheader
%l.022 = phi i64 [ 0, %for.cond1.preheader ], [ %inc10, %for.cond5.preheader ], !dbg !34
%0 = getelementptr i32, ptr %h, i64 %l.022
store i32 0, ptr %0, align 4, !dbg !24
%arrayidx.1 = getelementptr i32, ptr %0, i64 1, !dbg !26
store i32 1, ptr %arrayidx.1, align 4, !dbg !24
%arrayidx.2 = getelementptr i32, ptr %0, i64 2, !dbg !26
store i32 2, ptr %arrayidx.2, align 4, !dbg !24
%arrayidx.3 = getelementptr i32, ptr %0, i64 3, !dbg !26
store i32 3, ptr %arrayidx.3, align 4, !dbg !24
%inc10 = add nuw nsw i64 %l.022, 1, !dbg !27
%exitcond.not = icmp eq i64 %inc10, 5, !dbg !28
br i1 %exitcond.not, label %for.cond.cleanup3, label %for.cond5.preheader, !dbg !22
for.cond.cleanup3: ; preds = %for.cond5.preheader
%inc13 = add nuw nsw i64 %i.023, 1, !dbg !29
call void @llvm.dbg.value(metadata i64 %inc13, metadata !11, metadata !DIExpression()), !dbg !20
%exitcond24.not = icmp eq i64 %inc13, 23, !dbg !30
br i1 %exitcond24.not, label %exit, label %for.cond1.preheader, !dbg !21, !llvm.loop !31
exit: ; preds = %for.cond.cleanup3
ret void, !dbg !23
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3}
!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "outer-loop-vect.c", directory: "/test/file/path")
!2 = !{i32 2, !"Debug Info Version", i32 3}
!3 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 8, type: !5, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !9)
!5 = !DISubroutineType(types: !6)
!6 = !{null, !7}
!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !{!10, !11, !14, !17}
!10 = !DILocalVariable(name: "h", arg: 1, scope: !4, file: !1, line: 8, type: !7)
!11 = !DILocalVariable(name: "i", scope: !12, file: !1, line: 10, type: !13)
!12 = distinct !DILexicalBlock(scope: !4, file: !1, line: 10, column: 3)
!13 = !DIBasicType(name: "unsigned long", size: 64, encoding: DW_ATE_unsigned)
!14 = !DILocalVariable(name: "l", scope: !15, file: !1, line: 11, type: !13)
!15 = distinct !DILexicalBlock(scope: !16, file: !1, line: 11, column: 5)
!16 = distinct !DILexicalBlock(scope: !12, file: !1, line: 10, column: 3)
!17 = !DILocalVariable(name: "j", scope: !18, file: !1, line: 12, type: !13)
!18 = distinct !DILexicalBlock(scope: !19, file: !1, line: 12, column: 7)
!19 = distinct !DILexicalBlock(scope: !15, file: !1, line: 11, column: 5)
!20 = !DILocation(line: 0, scope: !12)
!21 = !DILocation(line: 10, column: 3, scope: !12)
!22 = !DILocation(line: 11, column: 5, scope: !15)
!23 = !DILocation(line: 14, column: 1, scope: !4)
!24 = !DILocation(line: 13, column: 11, scope: !25)
!25 = distinct !DILexicalBlock(scope: !18, file: !1, line: 12, column: 7)
!26 = !DILocation(line: 13, column: 2, scope: !25)
!27 = !DILocation(line: 11, column: 32, scope: !19)
!28 = !DILocation(line: 11, column: 26, scope: !19)
!29 = !DILocation(line: 10, column: 30, scope: !16)
!30 = !DILocation(line: 10, column: 24, scope: !16)
!31 = distinct !{!31, !21, !32, !33}
!32 = !DILocation(line: 13, column: 13, scope: !12)
!33 = !{!"llvm.loop.vectorize.enable", i1 true}
!34 = !DILocation(line: 10, column: 5, scope: !12)
;.
; CHECK: [[META0:![0-9]+]] = distinct !DICompileUnit(language: DW_LANG_C11, file: [[META1:![0-9]+]], producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
; CHECK: [[META1]] = !DIFile(filename: "{{.*}}outer-loop-vect.c", directory: {{.*}})
; CHECK: [[DBG4]] = distinct !DISubprogram(name: "foo", scope: [[META1]], file: [[META1]], line: 8, type: [[META5:![0-9]+]], scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: [[META0]], retainedNodes: [[META9:![0-9]+]])
; CHECK: [[META5]] = !DISubroutineType(types: [[META6:![0-9]+]])
; CHECK: [[META6]] = !{null, [[META7:![0-9]+]]}
; CHECK: [[META7]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: [[META8:![0-9]+]], size: 64)
; CHECK: [[META8]] = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
; CHECK: [[META9]] = !{[[META10:![0-9]+]], [[META11]], [[META14:![0-9]+]], [[META17:![0-9]+]]}
; CHECK: [[META10]] = !DILocalVariable(name: "h", arg: 1, scope: [[DBG4]], file: [[META1]], line: 8, type: [[META7]])
; CHECK: [[META11]] = !DILocalVariable(name: "i", scope: [[META12:![0-9]+]], file: [[META1]], line: 10, type: [[META13:![0-9]+]])
; CHECK: [[META12]] = distinct !DILexicalBlock(scope: [[DBG4]], file: [[META1]], line: 10, column: 3)
; CHECK: [[META13]] = !DIBasicType(name: "unsigned long", size: 64, encoding: DW_ATE_unsigned)
; CHECK: [[META14]] = !DILocalVariable(name: "l", scope: [[META15:![0-9]+]], file: [[META1]], line: 11, type: [[META13]])
; CHECK: [[META15]] = distinct !DILexicalBlock(scope: [[META16:![0-9]+]], file: [[META1]], line: 11, column: 5)
; CHECK: [[META16]] = distinct !DILexicalBlock(scope: [[META12]], file: [[META1]], line: 10, column: 3)
; CHECK: [[META17]] = !DILocalVariable(name: "j", scope: [[META18:![0-9]+]], file: [[META1]], line: 12, type: [[META13]])
; CHECK: [[META18]] = distinct !DILexicalBlock(scope: [[META19:![0-9]+]], file: [[META1]], line: 12, column: 7)
; CHECK: [[META19]] = distinct !DILexicalBlock(scope: [[META15]], file: [[META1]], line: 11, column: 5)
; CHECK: [[META20]] = !DILocation(line: 0, scope: [[META12]])
; CHECK: [[DBG21]] = !DILocation(line: 10, column: 3, scope: [[META12]])
; CHECK: [[DBG22]] = !DILocation(line: 10, column: 30, scope: [[META16]])
; CHECK: [[DBG23]] = !DILocation(line: 10, column: 5, scope: [[META12]])
; CHECK: [[DBG24]] = !DILocation(line: 13, column: 11, scope: [[META25:![0-9]+]])
; CHECK: [[META25]] = distinct !DILexicalBlock(scope: [[META18]], file: [[META1]], line: 12, column: 7)
; CHECK: [[DBG26]] = !DILocation(line: 13, column: 2, scope: [[META25]])
; CHECK: [[DBG27]] = !DILocation(line: 11, column: 32, scope: [[META19]])
; CHECK: [[DBG28]] = !DILocation(line: 11, column: 26, scope: [[META19]])
; CHECK: [[DBG29]] = !DILocation(line: 11, column: 5, scope: [[META15]])
; CHECK: [[LOOP30]] = distinct !{[[LOOP30]], [[META31:![0-9]+]], [[META32:![0-9]+]]}
; CHECK: [[META31]] = !{!"llvm.loop.isvectorized", i32 1}
; CHECK: [[META32]] = !{!"llvm.loop.unroll.runtime.disable"}
; CHECK: [[DBG33]] = !DILocation(line: 10, column: 24, scope: [[META16]])
; CHECK: [[LOOP34]] = distinct !{[[LOOP34]], [[META32]], [[META31]]}
; CHECK: [[DBG35]] = !DILocation(line: 14, column: 1, scope: [[DBG4]])
;.
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